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Sample records for nephrostomy balloon dilator

  1. Balloon dilatation of iatrogenic urethral strictures

    International Nuclear Information System (INIS)

    Acunas, B.; Acunas, G.; Gokmen, E.; Celik, L.

    1988-01-01

    Balloon dilatation of the urethra was performed in five patients with iatrogenic urethral strictures. The urethral strictures were successfully negotiated and dilated in all patients. Redilatation became necessary in a period ranging from 3 to 10 months. The authors believe that balloon dilatation of the urethra can be safely and successfully performed; the procedure produces minimal trauma and immediate relief of symptoms. (orig.)

  2. Balloon dilatations of esophageal strictures

    Energy Technology Data Exchange (ETDEWEB)

    Seo, Jeong Jin; Juhng, Seon Kwan; Kim, Jae Kyu; Chung, Hyon De [Chonnam National University College of Medicine, Seoul (Korea, Republic of)

    1990-04-15

    Most benign esophageal strictures can be successfully dilated with conventional bougienage technique. But occasionally strictures are so tight, lengthy, or sometimes irregular that this technique fail, and surgical intervention is required. Since 1974 Gruentzig balloon catheter has succeed when used for strictures in the cardiac and peripheral vasculatures, the biliary and urinary tracts, the colon of neonates after inflammatory disease and also in the esophagus. Fluoroscopically guided balloon catheters were used to dilate 30 esophageal strictures in 30 patients over 3 years at Department of Diagnostic Radiology, Chonnam University, College of Medicine. The distribution of age was from 7 years to 71 days and the ratio of male to female was 15:15. The causes of benign stricture (23 cases) were post-operative strictures (13), chemical (4), achalasia (3), chronic inflammation (2), esophageal rupture (1) and those of malignant stricture (7 cases) were post-radiation stricture of primary esophageal cancer (6) and metastatic esophageal cancer (1). The success rate of procedure was 93% (28/30). The causes of failure were the failure of passage of stricture due to markedly dilated proximal segment of esophagus (1 case) and too long segment of stricture (1 case). Complication of procedure was the diverticular-formation of esophagus in 3 cases, but has no clinical significance in follow-up esophagography. In conclusion, fluoroscopically guided balloon dilation of esophageal stricture appears to be safe, effective treatment and may be have theoretical advantages over conventional bougienage and also should be considered before other methods of treatment are used.

  3. Balloon dilatations of esophageal strictures

    International Nuclear Information System (INIS)

    Seo, Jeong Jin; Juhng, Seon Kwan; Kim, Jae Kyu; Chung, Hyon De

    1990-01-01

    Most benign esophageal strictures can be successfully dilated with conventional bougienage technique. But occasionally strictures are so tight, lengthy, or sometimes irregular that this technique fail, and surgical intervention is required. Since 1974 Gruentzig balloon catheter has succeed when used for strictures in the cardiac and peripheral vasculatures, the biliary and urinary tracts, the colon of neonates after inflammatory disease and also in the esophagus. Fluoroscopically guided balloon catheters were used to dilate 30 esophageal strictures in 30 patients over 3 years at Department of Diagnostic Radiology, Chonnam University, College of Medicine. The distribution of age was from 7 years to 71 days and the ratio of male to female was 15:15. The causes of benign stricture (23 cases) were post-operative strictures (13), chemical (4), achalasia (3), chronic inflammation (2), esophageal rupture (1) and those of malignant stricture (7 cases) were post-radiation stricture of primary esophageal cancer (6) and metastatic esophageal cancer (1). The success rate of procedure was 93% (28/30). The causes of failure were the failure of passage of stricture due to markedly dilated proximal segment of esophagus (1 case) and too long segment of stricture (1 case). Complication of procedure was the diverticular-formation of esophagus in 3 cases, but has no clinical significance in follow-up esophagography. In conclusion, fluoroscopically guided balloon dilation of esophageal stricture appears to be safe, effective treatment and may be have theoretical advantages over conventional bougienage and also should be considered before other methods of treatment are used

  4. Percutaneous balloon dilatation for benign hepaticojejunostomy strictures

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    Vos, P. M.; van Beek, E. J.; Smits, N. J.; Rauws, E. A.; Gouma, D. J.; Reeders, J. W.

    2000-01-01

    BACKGROUND: Percutaneous balloon dilatation of biliary tract strictures is generally accepted as a safe and inexpensive procedure. The effectiveness in selected groups of patients remains under discussion. The purpose of this study was to evaluate the results of percutaneous balloon dilatation in

  5. Retrograde transurethral balloon dilation of the prostate

    International Nuclear Information System (INIS)

    Castaneda, F.; Reddy, P.; Wasserman, N.F.; Lund, G.; Hulbert, J.; Hunter, D.; Castaneda-Zuniga, W.R.; Amplatz, K.

    1986-01-01

    A series of patients with documented benign prostatic hypertrophy evaluated by urodynamic studies, voiding cystourethrography, retrograde urethrography, and MR imaging underwent dilation performed using a retrograde transurethral approach with 25-mm balloon dilators inflated at a pressure of 3-4 atm for 10 minutes. Immediately after the procedure, retrograde and voiding cystourethrography as well as MR imaging were performed. A Foley catheter was left in place for 24 hours. Complete relief of symptoms has occurred in all of the patients during the follow-up period. No significant complications other than transient hematuria resulted from the procedure. Results of the comparison studies and of MR imaging are discussed

  6. Balloon catheter dilatation of benign urethral strictures

    International Nuclear Information System (INIS)

    Perini, L.; Cavallo, A.; Perin, B.; Bighi, G.

    1988-01-01

    The authors report their experience of benign urethral stricture dilatation by balloon catheter in 11 male patients. Ten posterior and 2 anterior urethral strictures were treated; in 1 patients several narrowings coexisted at various levels. Etiology was inflammatory in 4 cases, iatrogen in 3, post-traumatic in 2, and equivocal in 2. The patients were studied both before and soon after dilatation by means of retrograde and voiding cystourethrogram and uroflowgraphy; the follow-up (2-14 months) was performed by urodynamic alone. In all cases, dilatation was followed by the restoration of urethral gauge, together with prompt functional improvement of urodynamic parameters. The latter result subsisted in time in 9 patients. In 2 cases recurrences were observed demonstrated at once by clinics and urodynamics. Both lesions were successfully re-treated. Neither early not late complication occurred. In spite of the limited material, the valuable results obtained, together with the absence of complications, the peculiar morphology of recurrences, and the chance of repeating it make the procedure advisable as a valid alternative to conventional techniques for these pathologies

  7. The Evaluation of Endoscopic Balloon Dilation Treatment for

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    Shokri-Shirvani Javad

    2009-10-01

    Full Text Available Balloon dilatation of stricture is one of the new treatment methods among patients with gastric outlet obstruction (GOO. However, the prevalence and underlying etiologies of GOO in various populations are different. The goal of the present study was to determine the effectiveness of endoscopic balloon dilatation and factors that would affect its success rate patients with benign etiology for GOO. Forty-five patients with the symptoms of benign GOO were randomly selected. Gastric outlet was delineated using double channel videoendoscopy. The information of initial balloon dilation was collected from recorded files. Balloon dilatation was repeated during the mean follow up of 9.9 ± 5.8 months. The severity of gastric pain was measured immediately before balloon dilatation and one month after procedure and was rated on a 10 cm visual analogue scale. The mean age of patients was 43.7 ± 18.1 years and 86.7% of them were men. Furthermore, 71.1% were H pylori positive. Response rate to endoscopic balloon dilatation was 80% and 8 patients underwent surgical resection. Weight loss was more frequent in non-responding group. The pain severity was significantly reduced more in responding subjects. No meaningful relationships were found between the responses to balloon dilatation and positive H pylori and cigarette smoking. Endoscopic balloon dilation is safe and effective for most patients with benign gastric outlet obstruction and has favorable long-term outcome.

  8. The Evaluation of Endoscopic Balloon Dilation Treatment for Benign

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    H. Ghofrani

    2008-04-01

    Full Text Available Background and ObjectiveBalloon dilatation of stricture is one of the new treatment methods for patients with Gastric Outlet Obstruction (GOO. Prevalence and underlying etiologies of GOO in various populations are different. The goal of the present study was to determine the effectiveness of endoscopic balloon dilatation and factors that could affect method advantage among patients with benign etiology for GOO. Methods Forty-five patients with symptoms of benign GOO were randomly selected. The mean age of patients was 43.7±18.1 years and 86.7% of them were men. Gastric outlet was delineated using double channel videoendoscopy. The severity of gastric pain was measured by VAS test immediately before and one month after balloon dilatation. Patients were followed after procedure weekly (for the first month and then monthly. Balloon dilatation was repeated for 27% patients during the follow up period.ResultsPatients were followed for 9.9±5.8 months. Furthermore, 71.1% were H. pylori positive. Positive response percent to endoscopic balloon dilatation was 80% and eight patients were took under surgical resection. Weight loss was seen frequently in the non-respondent group. The pain severity was significantly reduced in respondent subjects. No meaningful correlations were found between the response to balloon dilatation and positive H. pylori and cigarette smoking.ConclusionEndoscopic balloon dilatation is a safe and effective method for treating most of patients with benign gastric outlet obstruction and has favorable long-term outcome. Keywords: Endoscopy, Gastric Outlet Obstruction (GOO, Balloon Dilatation

  9. Intragastric balloon for morbid obesity causing chronic gastric dilatation

    International Nuclear Information System (INIS)

    Pretolesi, F.; Derchi, L.E.; Redaelli, G.; Papagni, L.

    2001-01-01

    We describe the radiographic findings observed in a morbidly obese and diabetic patient with an intragastric air-filled balloon introduced as a therapeutic measure to reduce food intake. The balloon was associated with chronic gastric dilatation and had to be removed 3 months after insertion. However, together with diet and behavioural therapy, it proved effective in reducing body weight and ameliorating glycaemic control. Although rarely used, intragastric balloons for the treatment of morbid obesity are still encountered in radiological practice. Radiologists must be able to recognize them and to understand their complications. (orig.)

  10. Intragastric balloon for morbid obesity causing chronic gastric dilatation

    Energy Technology Data Exchange (ETDEWEB)

    Pretolesi, F.; Derchi, L.E. [Dept. of Radiology, University of Genoa (Italy); Redaelli, G.; Papagni, L. [IRCCS, Ist. Auxologico Italiano, Milan (Italy)

    2001-04-01

    We describe the radiographic findings observed in a morbidly obese and diabetic patient with an intragastric air-filled balloon introduced as a therapeutic measure to reduce food intake. The balloon was associated with chronic gastric dilatation and had to be removed 3 months after insertion. However, together with diet and behavioural therapy, it proved effective in reducing body weight and ameliorating glycaemic control. Although rarely used, intragastric balloons for the treatment of morbid obesity are still encountered in radiological practice. Radiologists must be able to recognize them and to understand their complications. (orig.)

  11. 28. Critical pulmonary valve stenosis: Medical management beyond balloon dilation

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    Muhammad Arif Khan

    2015-10-01

    Conclusion: Phentolamine and/or Captopril have a therapeutic role in neonates with critical PVS who remain oxygen dependent after balloon dilation. Both medicationslead to vasodilatation of pulmonary and systemic vascularity. They facilitate inflowto the right ventricle. Right to left shunt across a PFO or/ ASD minimizesand saturation improves leading to a significantreduction in length of hospitalization.

  12. Balloon dilatation of isolated severe tricuspid valve stenosis

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    Rajeev Bhardwaj

    2015-12-01

    Full Text Available Tricuspid valve stenosis is mostly rheumatic in origin. It almost always occurs in association with mitral valve disease. There are only few case reports of isolated tricuspid valve stenosis. We report a case of isolated tricuspid valve stenosis, which was treated with balloon dilatation.

  13. Balloon dilatation of isolated severe tricuspid valve stenosis

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    Bhardwaj, Rajeev; Sharma, Rajesh

    2015-01-01

    Tricuspid valve stenosis is mostly rheumatic in origin. It almost always occurs in association with mitral valve disease. There are only few case reports of isolated tricuspid valve stenosis. We report a case of isolated tricuspid valve stenosis, which was treated with balloon dilatation.

  14. Treatment of urethral strictures with balloon dilation: A forgotten tale

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    Konstantinos Stamatiou

    2015-09-01

    Full Text Available Urethral stricture is a common condition that can lead to serious complications such as urinary infections and renal insufficiency secondary to urinary retention. Treatment options include catheterization and dilation, urethroplasty and endoscopic internal urethrotomy as well. Although treatment option depends on the type, length and aetiology of stricture, the choice can be influenced to varying degrees by the simplicity of the method, the preferences of the patient the available accoutrements and the patient health condition. Both urethroplasty and endoscopic internal urethrotomy require anaesthesia and thus are not suitable for many elder and unfit for surgical treatment patients. On the other hand, dilations are easy to perform in every day clinical practice however they have been associated with iatrogenic urethral trauma. In contrast, balloon dilation under vision dilates by radial application of forces against the stricture, avoiding the potentially shearing forces associated with sequential rigid dilation. Since it reduces the possibility of an iatrogenic urethral trauma and the subsequent spongiofibrosis may lead into improved therapeutic outcomes. In this report we describe a technique for the treatment of urethral strictures with balloon dilation in elder and unfit for surgical treatment patients.

  15. [Expansion dilatation balloons for cervical ripening in obstetric practice].

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    Ducarme, G; Grange, J; Vital, M

    2016-02-01

    During recent decades, mechanical devices have been substituted by pharmacological methods. Their place in the therapeutic arsenal remains important with a renewed obstetrical interest for these devices. Due to a lack of data they are still not recommended as first-line. This review thus attempted to examine the use of expansion dilatation balloons (Foley catheter and double-balloons) to analyze their effectiveness in case of native uterus and previous cesarean section. Twenty-seven clinical trials had compared balloons catheter and prostaglandins in patients without a history of uterine scar. The risk of cesarean section did not differ. Mechanical methods seemed to be more effective in achieving delivery within 24hours, with fewer episodes of excessive uterine contractions, but they necessitated more oxytocin during labor. Ten clinical trials analyzed dilatation balloons in patients with previous cesarean section. More than 70% women had favorable cervical ripening (Bishop score>6), and vaginal delivery was reported between 35 and 70% of patients. The risk of uterine rupture was low between 0.64 and 0.72%, with neither increased risk of severe neonatal and maternal morbidity nor increased risk of infectious morbidity. Mechanical methods are effective and safe for third trimester cervical ripening, mainly in women with previous cesarean section. Potential advantages may include wide availability and reduction of some of the side effects. Copyright © 2015 Elsevier Masson SAS. All rights reserved.

  16. Hybrid cutting balloon dilatation for treatment of cor triatriatum sinister in a cat.

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    Stern, Joshua A; Tou, Sandra P; Barker, Piers C A; Hill, Kevin D; Lodge, Andrew J; Mathews, Kyle G; Keene, Bruce W

    2013-09-01

    A hybrid surgical approach and balloon dilatation were performed successfully in a cat with cor triatriatum sinister and clinical signs of congestive heart failure. Left lateral thoracotomy was used to access the heart and cutting balloon followed by standard balloon dilatation were utilized to dilate the perforation in the anomalous left atrial membrane. Clinical signs resolved completely after dilation of the anomalous left atrial membrane. Based upon the outcome of this case, balloon dilatation appears to be a viable treatment option for cats affected with cor triatriatum sinister. Published by Elsevier B.V.

  17. Endoscopic Papillary Balloon Dilation with Large Balloon after Limited Sphincterotomy for Retrieval of Choledocholithiasis

    Science.gov (United States)

    Bang, Seungmin; Kim, Myoung Hwan; Park, Jeong Youp; Park, Seung Woo; Song, Si Young

    2006-01-01

    Endoscopic papillary balloon dilation (EBD) for choledocholithiasis is known to be comparable to endoscopic sphincterotomy (EST) especially in cases of small stones. With larger stones, EBD with conventional balloon, which have a diameter of 6-8 mm, was reported as less effective for extraction of stones. We evaluated the efficacy and complications of EBD with large balloons (10-15 mm) after limited EST for retrieval of choledocholithiasis. From February 2005, we have performed EBD with limited EST for retrieval of common bile duct (CBD) stones. The patients who admitted with hyperamylasemia and gallstone pancreatitis were excluded. In cases without CBD dilation, EPBD with 12 mm for 40 seconds was performed. And in cases with CBD dilation, we dilated the sphincters with 15 mm sized balloon for 40 seconds. Total 22 patients (11 of male) were performed EBD with limited EST for retrieval of CBD stones. The median diameter of the stones was 10 mm (5-25 mm). Ten cases had multiple stones and 6 cases periampullary diverticuli. Successful stone removal in the initial session of ERCP with EBD was accomplished in 16 patients (72.7%). And complete retrieval of bile duct stones was achieved in all patients with repeated ERCP. In the aspect of complications, any episodes of perforation, bleeding was not developed. Only one case of mild grade of post-procedural pancreatitis was noted. However, post-procedural hyperamylasemia was developed in 16 cases (68.2%). EBD with larger balloon seems to be a feasible and safe alternative technique for conventional EST in CBD stone extraction. PMID:17191309

  18. Sinus Balloon Dilation as Treatment for Acute Sphenoid Sinusitis with Impaired Vision for a Child

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    Yin Zhao

    2016-01-01

    Full Text Available This paper is about sinus balloon dilatation in treatment of acute left sphenoid sinusitis with left impaired vision in a child. Balloon catheter dilatation (BCD of the sinus ostia is a new technique. It has been shown to be a minimally invasive technique to manage chronic sinusitis. However, this method is rarely used in the treatment of acute sinusitis. So far, we know of no reported cases of sinus balloon dilatation in treatment of this case, especially for children.

  19. Endoscopic balloon dilatation for Crohn's strictures of the gastrointestinal tract is feasible

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    Karstensen, John Gásdal; Hendel, Jakob; Vilmann, Peter

    2012-01-01

    Despite optimized medical treatment, Crohn´s disease can cause gastrointestinal (GI) strictures, which requires surgical intervention. Lately, endoscopic balloon dilatation has been established as an alternative to surgery. In the following, we report our experiences with endoscopic dilatation...

  20. Endoscopic balloon dilatation as treatment of gastric outlet obstruction in infancy and childhood

    NARCIS (Netherlands)

    Heymans, H. S.; Bartelsman, J. W.; Herweijer, T. J.

    1988-01-01

    The application of balloon dilatation as treatment of gastric outlet obstruction is described. In two infants after inadequate pyloromyotomy and in an 11-year-old boy with surgical damage to the vagus, balloon dilatation was successful and considered a good alternative to surgery in these conditions

  1. The therapy of esophageal stricture caused by erosive through balloon dilation

    International Nuclear Information System (INIS)

    Li Yi; Zeng Xianqiang; Wang Rongqin; Ding Xiaolin; You Guoqing; Shao Hede; Zhang Xinyuan

    2004-01-01

    Objective: To evaluate the therapy of esophageal stricture caused by erosive burn of esophagus through balloon dilation. Methods: 9 patients of esophageal stricture caused by erosive burn of esophagus have been treated by balloon dilation. Results: 9 patients have been dilated 26 times altogether 7 of them can eat normally. 2 patients' symptoms were improved. Six months to two years after operation, the symptoms were not reoccurred. All of them have no serious complications. Conclusion: Balloon dilation is one of the effective and safe therapy of esophageal stricture caused by erosive burn. (authors)

  2. Current status of endoscopic balloon dilation for Crohn's disease

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    Fumihito Hirai

    2017-04-01

    Full Text Available The therapeutic target in Crohn's disease (CD has been raised to the achievement of mucosal healing. Although effective treatments that target cytokines and other molecules has been widely used for CD, intestinal strictures are still a major cause of surgery. Endoscopic balloon dilation (EBD is known to be an effective and safe intervention for intestinal strictures in CD. Since frequent intestinal resection often results in short bowel syndrome and can decrease the quality of life, EBD can help avoid surgery. EBD with a conventional colonoscope for Crohn's strictures of the colon and ileo-colonic anastomosis has established efficacy and safety. In addition, EBD using balloon-assisted enteroscopy has recently been applied for small bowel Crohn's strictures. Although the evidence is not strong, EBD may become an alternative to surgery in small bowel strictures in CD. EBD and other new methods such as self-expanding stent implantation for Crohn's strictures may be useful and safe; however, it is important to address several issues regarding these interventions and to establish a protocol for combined therapies.

  3. Transcatheter pulmonary valve perforation and balloon dilatation in neonates with pulmonary atresia and intact ventricular septum

    NARCIS (Netherlands)

    Gerestein, C.G.; Berger, R.M.F.; Dalinghaus, M.; Bogers, A.J.J.C.; Witsenburg, M.

    2003-01-01

    BACKGROUND: Pulmonary atresia and intact ventricular septum is characterised by a great morphological variety. Treatment is not uniform. OBJECTIVE: To evaluate our experience with transcatheter valvotomy and balloon dilatation in neonates with pulmonary atresia and intact ventricular septum. DESIGN:

  4. Predictors for outcome of failure of balloon dilatation in patients with achalasia

    NARCIS (Netherlands)

    J. Alderliesten (Joyce); J.M. Conchillo; I. Leeuwenburgh (Ivonne); E.W. Steyerberg (Ewout); E.J. Kuipers (Ernst)

    2011-01-01

    textabstractBackground: Pneumatic balloon dilatation (PD) is a regular treatment modality for achalasia. The reported success rates of PD vary. Recurrent symptoms often require repeated PD or surgery. Objective: To identify predicting factors for symptom recurrence requiring repeated treatment.

  5. Membranous duodenal stenosis: initial experience with balloon dilatation in four children

    NARCIS (Netherlands)

    van Rijn, R. R.; van Lienden, K. P.; Fortuna, T. L.; D'Alessandro, L. C. A.; Connolly, B.; Chait, P. G.

    2006-01-01

    INTRODUCTION: We present a novel approach to the treatment of membranous duodenal stenosis (MDS). To our knowledge this is the first paper to describe balloon dilatation for this entity. MATERIAL AND METHODS: Four children, 2 boys and 2 girls, aged between 8 and 28 days, underwent duodenal balloon

  6. Balloon Dilatation of Pediatric Subglottic Laryngeal Stenosis during the Artificial Apneic Pause: Experience in 5 Children

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    J. Lisý

    2014-01-01

    Full Text Available Introduction. Balloon dilatation is a method of choice for treatment of laryngeal stenosis in children. The aim of procedure in apneic pause is to avoid new insertion of tracheostomy cannula. Patients and Methods. The authors performed balloon dilatation of subglottic laryngeal strictures (SGS in 5 children (3 girls and 2 boys without tracheotomy. Two of them with traumatic and inflammatory SGS had a tracheal cannula removed in the past. The other 3 children with postintubation SGS had never had a tracheostomy before. The need for tracheostomy due to worsening stridor was imminent for all of them. Results. The total of seven laryngeal dilatations by balloon esophagoplasty catheter in apneic pause was performed in the 5 children. The procedure averted the need for tracheostomy placement in 4 of them (80%. Failure of dilatation in girl with traumatic stenosis and concomitant severe obstructive lung disease led to repeated tracheostomy. Conclusion. Balloon dilatation of laryngeal stricture could be done in the absence of tracheostomy in apneic pause. Dilatation averted threatening tracheostomy in all except one case. Early complication after the procedure seems to be a negative prognostic factor for the outcome of balloon dilatation.

  7. Late complications of percutaneous tracheostomy using the balloon dilation technique.

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    Araujo, J B; Añón, J M; García de Lorenzo, A; García-Fernandez, A M; Esparcia, M; Adán, J; Relanzon, S; Quiles, D; de Paz, V; Molina, A

    2018-04-01

    The purpose of this study was to determine the late complications in critically ill patients requiring percutaneous tracheostomy (PT) using the balloon dilation technique. A prospective, observational cohort study was carried out. Two medical-surgical intensive care units (ICU). All mechanically ventilated adult patients consecutively admitted to the ICU with an indication of tracheostomy. All patients underwent PT according to the Ciaglia Blue Dolphin ® method, with endoscopic guidance. Survivors were interviewed and evaluated by fiberoptic laryngotracheoscopy and tracheal computed tomography at least 6 months after decannulation. Intraoperative, postoperative and long-term complications and mortality (in-ICU, in-hospital) were recorded. A total of 114 patients were included. The most frequent perioperative complication was minor bleeding (n=20) and difficult cannula insertion (n=19). Two patients had severe perioperative complications (1.7%) (major bleeding and inability to complete de procedure in one case and false passage and desaturation in the other). All survivors (n=52) were evaluated 211±28 days after decannulation. None of the patients had symptoms. Fiberoptic laryngotracheoscopy and computed tomography showed severe tracheal stenosis (>50%) in 2patients (3.7%), both with a cannulation period of over 100 days. Percutaneous tracheostomy using the Ciaglia Blue Dolphin ® technique with an endoscopic guide is a safe procedure. Severe tracheal stenosis is a late complication which although infrequent, must be taken into account due to its lack of clinical expressiveness. Evaluation should be considered in those tracheostomized critical patients who have been cannulated for a long time. Copyright © 2017 Elsevier España, S.L.U. y SEMNIM. All rights reserved.

  8. A new approach to the diagnosis of esophageal rupture due to balloon dilatation

    International Nuclear Information System (INIS)

    Song, Ho Young; Han, Young Min; Lee, Sang Young; Kuh, Ja Hong; Lee, Dong Kun; Chae, Soo Wan

    1990-01-01

    The diagnosis of esophageal rupture in balloon dilatation is usually made from clinical symptom of sharp chest pain, plain chest radiographs and esophagograms after dilation. It has some problems; the pain is varied patients to patients and bacterial flora in the mouth or esophagus can be mixed with the contrast media to flow into the mediastinum during esophagography, to create mediastinitis. We could make the diagnosis of esophageal rupture without using contrast media by the observation of the pressure change in the balloon during dilatation. An infusion pump, transducer and esophageal balloon were connected through a multi-way connector, and the transducer of them was also connected to an amplifier which was connected to a pressure monitor to record the balloon pressure. As balloon(20mm/3cm) inserted in the mid-thoracic esophagus under the fluoroscopic control was inflated until the esophagus was ruptured. Balloon was distended by injecting air in 15 rabbits(A group), and by injecting diluted contrast medium in 15 rabbits(B group). The pressure decrease after esophageal rupture was ranged from 94 to 160 mmHg(mean; 103) in A group and 340 to 1040 mmHg(mean; 537) in B group. The pressure curve of A group was smooth, regular and so accurate to make the diagnosis of esophageal rupture, whereas that of B group was irregular and not so accurate. In conclusion, our new method to make the diagnosis of esophageal rupture during balloon dilatation may be useful in patients of esophageal stricture

  9. The Evaluation of Endoscopic Balloon Dilation Treatment for Benign Gastric Outlet Obstruction

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    J Sokri Shirvani

    2012-05-01

    Full Text Available

    Background and Objective

    Balloon dilatation of stricture is one of the new treatment methods for patients with Gastric Outlet Obstruction (GOO. Prevalence and underlying etiologies of GOO in various populations are different. The goal of the present study was to determine the effectiveness of endoscopic balloon dilatation and factors that could affect method advantage among patients with benign etiology for GOO.

     

    Methods

     Forty-five patients with symptoms of benign GOO were randomly selected. The mean age of patients was 43.7±18.1 years and 86.7% of them were men. Gastric outlet was delineated using double channel videoendoscopy. The severity of gastric pain was measured by VAS test immediately before and one month after balloon dilatation. Patients were followed after procedure weekly (for the first month and then monthly. Balloon dilatation was repeated for 27% patients during the follow up period.

     

    Results

    Patients were followed for 9.9±5.8 months. Furthermore, 71.1% were H. pylori positive. Positive response percent to endoscopic balloon dilatation was 80% and eight patients were took under surgical resection. Weight loss was seen frequently in the non-respondent group. The pain severity was significantly reduced in respondent subjects. No meaningful correlations were found between the response to balloon dilatation and positive H. pylori and cigarette smoking.

     

    Conclusion

    Endoscopic balloon dilatation is a safe and effective method for treating most of patients with benign gastric outlet obstruction and has favorable long-term outcome. 

  10. Trans-Balloon Visualisation During Dilatation (TBVD) of Oesophageal Strictures: a Novel Innovation.

    Science.gov (United States)

    Khokhar, Haseeb A; Azeem, Beenish; Bughio, Mumtaz; Bass, Gary A; Elfadul, Amr; Salih, Monim; Fahmy, Waleed; Walsh, Thomas N

    2016-04-01

    Hydrostatic balloon dilatation of upper gastrointestinal strictures is associated with a risk of perforation that varies with the underlying pathology and with the technique employed. We present a technique of trans-balloon visualisation of the stricture during dilatation (TBVD) that allows direct 'real-time' observation of the effect of dilatation on the stricture, facilitating early recognition of mucosal abruption, thereby reducing the perforation rate. We retrospectively analysed 100 consecutive patients, undergoing balloon dilatation of oesophageal strictures between 1st of January 2011 and 1st of July 2014. One hundred patients underwent 186 dilatations, with 34 having multiple procedures (mean 1.86). All had oesophageal strictures (mean diameter 8.49 mm, range 5-11 mm) and most underwent dilatation up to a maximum of 17 mm (mean 14.7 mm). Fifty-six percent were male and the average age was 62.5 years (17-89 years). Only one patient (0.5% of all procedures) had a full-thickness perforation requiring intervention while just one further patient had a deep mucosal tear that did not require intervention. TBVD is a safe technique with a short learning curve and is one of the important factors that allow potentially difficult dilatations to be performed safely with an exceptionally low rate of adverse events of less than 1%.

  11. Transthoracic ultrasound guided balloon dilation of cor triatriatum dexter in 2 Rottweiler puppies.

    Science.gov (United States)

    Birettoni, F; Caivano, D; Bufalari, A; Giorgi, M E; Miglio, A; Paradies, P; Porciello, F

    2016-12-01

    Balloon dilation was performed in two Rottweiler puppies with cor triatriatum dexter and clinical signs of ascites using transthoracic echocardiographic guidance. The dogs were positioned on a standard echocardiography table in right lateral recumbency, and guide wires and balloon catheters were imaged by echocardiographic views optimized to allow visualization of the defect. The procedures were performed successfully without complications and clinical signs were resolved completely in both cases. Guide wires and balloon catheters appeared hyperechoic on transthoracic echocardiography image and could be clearly monitored and guided in real-time. These two cases demonstrate that it is possible to perform balloon catheter dilation of cor triatriatum dexter under transthoracic guidance alone. Copyright © 2016 Elsevier B.V. All rights reserved.

  12. Promising results after balloon dilatation of the Eustachian tube for obstructive dysfunction

    DEFF Research Database (Denmark)

    Wanscher, Jens H; Svane-Knudsen, Viggo

    2014-01-01

    INTRODUCTION: As the first ear, nose and throat department in Denmark, we introduced balloon dilatation of the Eustachian tube as a treatment of obstructive dysfunction in the summer of 2012. We present our preliminary experiences with this new treatment in adults. MATERIAL AND METHODS: Preoperat......INTRODUCTION: As the first ear, nose and throat department in Denmark, we introduced balloon dilatation of the Eustachian tube as a treatment of obstructive dysfunction in the summer of 2012. We present our preliminary experiences with this new treatment in adults. MATERIAL AND METHODS...

  13. Balloon Dilatation and Stenting for Aortic Coarctation: A Systematic Review and Meta-Analysis.

    Science.gov (United States)

    Salcher, Maximilian; Naci, Huseyin; Law, Tyler J; Kuehne, Titus; Schubert, Stephan; Kelm, Marcus

    2016-06-01

    There is no systematic assessment of available evidence on effectiveness and comparative effectiveness of balloon dilatation and stenting for aortic coarctation. We systematically searched 4 online databases to identify and select relevant studies of balloon dilatation and stenting for aortic coarctation based on a priori criteria (PROSPERO 2014:CRD42014014418). We quantitatively synthesized results for each intervention from single-arm studies and obtained pooled estimates for relative effectiveness from pairwise and network meta-analysis of comparative studies. Our primary analysis included 15 stenting (423 participants) and 12 balloon dilatation studies (361 participants), including patients ≥10 years of age. Post-treatment blood pressure gradient reduction to ≤20 and ≤10 mm Hg was achieved in 89.5% (95% confidence interval, 83.7-95.3) and 66.5% (44.1-88.9%) of patients undergoing balloon dilatation, and in 99.5% (97.5-100.0%) and 93.8% (88.5-99.1%) of patients undergoing stenting, respectively. Odds of achieving ≤20 mm Hg were lower with balloon dilatation as compared with stenting (odds ratio, 0.105 [0.010-0.886]). Thirty-day survival rates were comparable. Numerically more patients undergoing balloon dilatation experienced severe complications during admission (6.4% [2.6-10.2%]) compared with stenting (2.6% [0.5-4.7%]). This was supported by meta-analysis of head-to-head studies (odds ratio, 9.617 [2.654-34.845]) and network meta-analysis (odds ratio, 16.23, 95% credible interval: 4.27-62.77) in a secondary analysis in patients ≥1 month of age, including 57 stenting (3397 participants) and 62 balloon dilatation studies (4331 participants). Despite the limitations of the evidence base consisting predominantly of single-arm studies, our review indicates that stenting achieves superior immediate relief of a relevant pressure gradient compared with balloon dilatation. © 2016 American Heart Association, Inc.

  14. Hygroscopic dilators vs balloon catheter ripening of the cervix for induction of labor in nulliparous women at term: Retrospective study.

    Directory of Open Access Journals (Sweden)

    Ryosuke Shindo

    Full Text Available To compare the efficacy and safety of hygroscopic dilators and balloon catheters for ripening of the cervix in induction of labor.This retrospective, observational study used data from the Successive Pregnancy Birth Registry System of the Japan Society of Obstetrics and Gynecology from 2012 to 2014. Nulliparous women in whom labor was induced by mechanical methods of cervical ripening at term were enrolled. The eligible women were divided into dilator, balloon 0.05. The vaginal instrumental delivery rate was higher in the two-balloon groups than in the dilator group. The volume of intrapartum hemorrhage was lowest in the dilator group. No significant difference in the frequencies of uterine rupture and intrauterine infection were observed among the dilator and two-balloon groups. With regard to neonatal outcomes, the frequency of a low Apgar score was statistically significantly lower in the dilator group than in the two-balloon groups. Moreover, the frequency of neonatal death tended to be lower in the dilator group than in the two-balloon groups.With regard to cervical ripening for labor induction in nulliparous women at term, the vaginal delivery rate on using a dilator and on using a balloon seems to be equivalent. Concerning maternal complications and neonatal outcomes, cervical ripening with hygroscopic dilators in labor induction might be safer.

  15. Hygroscopic dilators vs balloon catheter ripening of the cervix for induction of labor in nulliparous women at term: Retrospective study.

    Science.gov (United States)

    Shindo, Ryosuke; Aoki, Shigeru; Yonemoto, Naohiro; Yamamoto, Yuriko; Kasai, Junko; Kasai, Michi; Miyagi, Etsuko

    2017-01-01

    To compare the efficacy and safety of hygroscopic dilators and balloon catheters for ripening of the cervix in induction of labor. This retrospective, observational study used data from the Successive Pregnancy Birth Registry System of the Japan Society of Obstetrics and Gynecology from 2012 to 2014. Nulliparous women in whom labor was induced by mechanical methods of cervical ripening at term were enrolled. The eligible women were divided into dilator, balloon 0.05). The vaginal instrumental delivery rate was higher in the two-balloon groups than in the dilator group. The volume of intrapartum hemorrhage was lowest in the dilator group. No significant difference in the frequencies of uterine rupture and intrauterine infection were observed among the dilator and two-balloon groups. With regard to neonatal outcomes, the frequency of a low Apgar score was statistically significantly lower in the dilator group than in the two-balloon groups. Moreover, the frequency of neonatal death tended to be lower in the dilator group than in the two-balloon groups. With regard to cervical ripening for labor induction in nulliparous women at term, the vaginal delivery rate on using a dilator and on using a balloon seems to be equivalent. Concerning maternal complications and neonatal outcomes, cervical ripening with hygroscopic dilators in labor induction might be safer.

  16. [Large balloon dilation for removal of choledocholithiasis difficult to extract: clinical experience].

    Science.gov (United States)

    Marin Calderón, Luis; Vera Calderón, Augusto; Gómez Correa, Aldo; Cervera Reyes, Zenon; Dávalos Moscol, Milagros; Alva Alva, Edgar; Palacios Salas, Fernando; Díaz Ríos, Ramiro; Guzmán Calderón, Edson; García Chihuan, Grisley

    2016-01-01

    The aim of this study was to report the initial experience of the combined use of biliary sphincterotomy plus balloon dilatation of the papilla for management of large stones. Design: Retrospective, descriptive. This study included 18 patients in whom a hydrostatic dilatation of the papilla with large balloons was performed between June 2012 and April 2014. Patients had multiple large stones, tapered distal common bile duct, previous sphincterotomy, or peri/ intradiverticular papilla. CRE™ dilatation balloons with diameters ranging from 12 to 20 mm were used. Data were recorded as successful procedure, use of lithotripsy and complications during the procedure. The average age was 66.1 years. There was a predominance of the female gender (66.7%). The average size of the bile duct stones was 16.7 mm. The main indications were: giant choledocholithiasis (12 patients, 66.7%) and tapered distal common bile duct (6 patients, 33.3%). The dilatation balloons diameter used were: 15 mm (8 patients, 44.4%), 18 mm (5 patients, 27.8%), 12 mm (3 patients, 16.7%) and 20 mm (2 patients, 11.1%). Complete stone clearance was achieved in 15 patients (83.3%). Lithotripsy was performed in 4 patients (22.2%). There were 3 patients in whom the removal with balloon was unsuccessful, performed surgical management. It was reported 1 case of mild acute pancreatitis (5.5%). The results show that endoscopic papillary large balloon dilation after sphincterotomy is a safe and effective technique for treatment of difficult bile duct stones.

  17. Percutaneous transvenous angioplasty of inferior vena cava by balloon dilatation

    Energy Technology Data Exchange (ETDEWEB)

    Suh, Kyung Suk; Kim, Jae Kyu; Park, Jin Gyun; Kang, Heung Keun; Chung, Hyon De; Kim, Shin Kon; Chung, Sang Young [Chonnam National University College of Medicine, Kwangju (Korea, Republic of)

    1989-10-15

    3 patients with membranous (2 patients) and segmental (1 patient) obstruction of IVC were successfully treated by percutaneous transvenous angioplasty using balloon catheter. Improvements of clinical and radiological findings could be obtained after procedures. Relatively good patency was obtained in all cases without complications. This procedure can be applied safely to membranous or segmental obstructions of IVC and elsewhere in the venous systems.

  18. Ureteropelvic junction obstruction and ureteral strictures treated by simple high-pressure balloon dilation

    DEFF Research Database (Denmark)

    Osther, P J; Geertsen, U; Nielsen, H V

    1998-01-01

    congenital UPJO, previous stones, sequelae of endoscopic and open surgery, radiotherapy, and urinary tract reconstruction. A retrograde ureteroscopic approach was used. Evaluation included clinical and radiographic examinations and renal scintigraphy with diuretic wash-out. The procedure was repeated in 21......%, and in strictures secondary to reconstructive and ureteroscopic surgery, with a success rate of 91%. In congenital UPJO, the results were less encouraging: in patients with a symptom debut after the age of 18 years, balloon dilation was successful in 57% of cases; in patients with symptom debut before the age of 18...... years, success was achieved in only 25% of cases. There were no major complications. It was concluded that simple high-pressure balloon dilation is a safe and reasonably effective technique for the management of most ureteral strictures and congenital UPJO with symptom debut in adult life. Balloon...

  19. Anaesthetic management for balloon dilation of cor triatriatum dexter in a dog.

    Science.gov (United States)

    De Monte, Valentina; Staffieri, Francesco; Caivano, Domenico; Bufalari, Antonello

    2015-06-10

    A three-month-old female Rottweiler puppy was referred for intravascular correction of a previously identified cor triatriatum dexter. Echocardiography confirmed the presence of a hyperechoic membrane that divided the right atrium into a cranial and caudal chamber. A foramen in this membrane allowed the blood to flow from the caudal to the cranial chamber. Balloon dilation of the defect under transthoracic echocardiographic guidance was scheduled for the following day. The dog was premedicated with 0.5 μg/kg sufentanil and 0.2 mg/kg midazolam administered intravenously. General anaesthesia was induced with 2 mg/kg propofol and maintained with inhaled isoflurane in oxygen; at the same time, a constant rate infusion of 0.5 μg/kg/h sufentanil was administered by means of an infusion pump. Uneventful ventricular and supraventricular tachyarrhythmias developed during the placement of catheters and balloon dilation. At the end of procedure, when the guide wire and balloon catheter were removed, normal sinus rhythm was observed. To the authors' knowledge, no previous reports have described the anaesthetic management of a balloon dilation procedure for cor triatriatum dexter in dogs.

  20. In-office, multisinus balloon dilation: 1-Year outcomes from a prospective, multicenter, open label trial.

    Science.gov (United States)

    Gould, James; Alexander, Ian; Tomkin, Edward; Brodner, David

    2014-01-01

    The objective of this prospective, multicenter study was to assess 1-year changes in sinonasal symptoms and health care use after office-based multisinus balloon dilation. Adults diagnosed with chronic or recurrent acute rhinosinusitis per the 2007 adult sinusitis guidelines were enrolled in this Institutional Review Board-approved study. Balloon dilation of the maxillary sinuses/ethmoid infundibula with or without frontal or sphenoid ostial dilation was performed in the physician's office under local anesthesia. Intraoperative procedure technical success and subject procedure tolerance were recorded. Efficacy was assessed using the patient-reported 20-item Sino-Nasal Outcome Test (SNOT-20) and Rhinosinusitis Symptom Inventory (RSI). Complications and revision surgeries were also recorded. A total of 313 ostial dilations were attempted and 307 were successfully completed (98.1%) in 81 subjects. Mean procedure tolerance was 2.8 ± 2.2 (0 = no pain; 10 = severe pain). Clinically meaningful and statistically significant (p < 0.0001) mean SNOT-20 symptom improvement was observed at 1 and 6 months and sustained through 1 year. The RSI treatment effect for all major rhinosinusitis symptoms was "large" and improvement in each was significant (p < 0.0001). Compared with the previous 1-year period, patients reported an average of 2.3 fewer acute sinus infections (p < 0.0001), 2.4 fewer antibiotic courses taken (p < 0.0001), and 3.0 fewer sinus-related physician visits (p < 0.0001) after balloon dilation. No serious device or procedure-related adverse events occurred. One subject (1.3%) underwent revision surgery. In-office, multisinus balloon dilation is safe, effective, and well tolerated. Patients reported significant reductions in both sinonasal symptoms and health care use after balloon dilation. Efficacy observed at 1 and 6 month follow-up was sustained through 1 year with a very low rate of revision surgery. This study was a part of the clinical trial NCT01612780

  1. Nonradiation ERCP with endoscopic biliary sphincterotomy plus papillary balloon dilation for the treatment of choledocholithiasis during pregnancy.

    Science.gov (United States)

    Ersoz, Galip; Turan, Ilker; Tekin, Fatih; Ozutemiz, Omer; Tekesin, Oktay

    2016-01-01

    Endoscopic retrograde cholangiopancreatography (ERCP) is currently the treatment of choice for symptomatic choledocholithiasis in pregnant patients. We aimed to present our experience with pregnant patients who underwent nonradiation ERCP and to evaluate the safety and efficacy of a new technique. A retrospective analysis of nonradiation ERCP in 22 pregnant patients with symptomatic choledocholithiasis between January 2002 and December 2013 was performed. The bile aspiration technique with wire-guided sphincterotome was used to confirm selective biliary cannulation. Transpapillary pancreatic septotomy was performed in cases with difficult biliary cannulation (n = 3). After endoscopic biliary sphincterotomy, endoscopic papillary balloon dilation was performed with a 6- or 8-mm dilation balloon in all patients to reduce the risk of recurrent cholangitis because of residual or additional stones. Stones were extracted by balloon sweeping after dilation. All patients were followed for 6 months after the ERCP procedure. Biliary cannulation was achieved in all patients. Endoscopic papillary balloon dilation was performed with a 6-mm balloon in 17 patients and an 8-mm balloon in five patients. The stones were extracted in 18 of the 22 patients by balloon sweeping, but no stones were extracted in the remaining four patients. There were two cases of mild post-ERCP pancreatitis. All patients delivered at term, and none experienced recurrence of choledocholithiasis and/or cholangitis during the 6-month follow-up. Endoscopic biliary sphincterotomy plus endoscopic papillary balloon dilation in nonradiation ERCP is a safe and effective treatment method for symptomatic choledocholithiasis during pregnancy.

  2. [BALLOON DILATATION IN COMBINATION WITH A DOSED PAPILLOTOMY IN THE TREATMENT OF DIFFICULT FORMS OF CHOLEDOCHOLITHIASIS].

    Science.gov (United States)

    Shapovalova, E I; Grubnik, V V; Tkachenko, A I; Gerasimov, D V; Romak, R P

    2016-04-01

    Results of treatment was studied in 2008 - 2015 yrs in 57 patients, suffering "difficult stones" (choledocholithiasis), in whom a dosed papillotomy in combination with the balloon dilatation. The advantages of application of combined dosed endoscopic papillosphincterotomy and balloon dilatation, comparing with complete endoscopic papillosphincterotomy, while treating "difficult stones" of common biliary duct, were established. Application of the procedure have guaranteed a good access through the duodenal papilla magna and have permitted to perform the calculi extraction in a less traumatic way, what have promoted its function preservation, and reduction of a postoperative complications rate, the patients' stationary treatment duration, and the remote complications rate. Using questionnaire SF-36, the quality of life was analyzed in patients, in whom in remote period the duodenal papilla magna function was preserved.

  3. Balloon catheter dilatation for mitral stenosis and severe pulmonary hypertension

    International Nuclear Information System (INIS)

    Wang Manhong

    2002-01-01

    Objective: To determine the safety and efficacy of percutaneous balloon mitral valvuloplasty (PBMV) for patients with mitral stenosis and severe pulmonary hypertension, and to assess the changes in pulmonary systolic pressure during follow-up. Methods: Forty-two patients with rheumatic mitral stenosis and severe pulmonary hypertension (pulmonary systolic pressure > 75 mmHg) underwent PBMV using standard Inoue technique, and the changes in clinical functional status and echo Doppler pulmonary systolic pressure during follow-up were assessed. Results: PBMV was successful in 39 patients. Immediately after the procedure, mitral valve area increased from (0.83 +- 0.12) cm 2 to (1.75 +- 0.11) cm 2 , pulmonary systolic pressure decreased from (85 +- 7) mmHg to (61 +- 13) mmHg (all P < 0.001). Severe mitral regurgitation occurred in 3 patients, one of whom underwent mitral valve replacement. During follow-up (average 6 months), in 39 patients with successful PBMV, the clinical functional status was improved and pulmonary systolic pressure was further decreased despite unchanged mitral valve area. Conclusions: PBMV was safe and effective for patients with mitral stenosis and severe pulmonary hypertension. Clinical functional status was improved and pulmonary systolic pressure was continuously decreased during the short-term follow-up

  4. History of urethral catheters and their balloons: drainage, anchorage, dilation, and hemostasis.

    Science.gov (United States)

    Marino, R A; Mooppan, U M; Kim, H

    1993-04-01

    Male urethral catheterization, as practiced in early Greece, was made possible by a sound knowledge of anatomy. It has been preserved by written tradition and advanced by the development of new materials. Balloon dilation, conceived and practiced more than 160 years ago by urologists, has undergone a similar cycle. Some useful ideas, once conceived, have been forgotten and have surfaced again, decades, sometimes centuries, later as new inventions.

  5. Is endoscopic papillary large balloon dilation safe for treating large CBD stones?

    Science.gov (United States)

    Shim, Chan Sup; Kim, Ji Wan; Lee, Tae Yoon; Cheon, Young Koog

    2016-01-01

    In recent years, endoscopic papillary large balloon dilation (EPLBD) with endoscopic sphincterotomy (EST) has been shown to be an effective technique for the removal of large or difficult common bile duct (CBD) stones, as an alternative to EST. Reviewing the literature published since 2003, it is understood that EPLBD has fewer associated overall complications than EST. Bleeding occurred less frequently with EPLBD than with EST. There was no significant difference in postendoscopic retrograde cholangiopancreatography pancreatitis or perforation. Recent accumulated results of EPLBD with or even without EST suggest that it is a safe and effective procedure for the removal of large or difficult bile duct stones without any additional risk of severe adverse events, when performed under appropriate guidelines. Since use of a larger balloon can tear the sphincter as well as the bile duct, possibly resulting in bleeding and perforation, a balloon size that is equal to or smaller in diameter than the diameter of the native distal bile duct is recommended. The maximum transverse diameter of the stone and the balloon-stone diameter ratio have a tendency to affect the success or failure of complete removal of stones by large balloon dilation to prevent adverse effects such as perforation and bleeding. One should take into account the size of the native bile duct, the size and burden of stones, the presence of stricture of distal bile duct, and the presence of the papilla in or adjacent to a diverticulum. Even though the results of EPLBD indicate that it is a relatively safe procedure in patients with common duct stones with a dilated CBD, the recommended guidelines should be followed strictly for the prevention of major adverse events such as bleeding and perforation.

  6. The Accordion Sign in the Transplant Ureter: Ramifications During Balloon Dilation of Strictures

    Energy Technology Data Exchange (ETDEWEB)

    Kriegshauser, J. Scott, E-mail: skriegshauser@mayo.edu; Naidu, Sailen G. [Mayo Clinic Hospital, Department of Radiology (United States); Chang, Yu-Hui H. [Mayo Clinic, Department of Biostatistics (United States); Huettl, Eric A. [Mayo Clinic Hospital, Department of Radiology (United States)

    2015-04-15

    PurposeThis study was designed to demonstrate the accordion sign within the transplant ureter and evaluate its ramifications during balloon dilation of strictures.MethodsA retrospective electronic chart and imaging review included demographic characteristics, procedure reports, and complications of 28 renal transplant patients having ureteral strictures treated with percutaneous balloon dilation reported in our transplant nephrology database during an 8-year period. The accordion sign was deemed present or absent on the basis of an imaging review and was defined as present when a tortuous ureter became kinked and irregular when foreshortened after placement of a wire or a catheter. Procedure-related urine leaks were categorized as occurring at the stricture if within 2 cm; otherwise, they were considered away from the stricture.ResultsThe accordion sign was associated with a significantly greater occurrence of leaks away from the stricture (P = 0.001) but not at the stricture (P = 0.34).ConclusionsThe accordion sign is an important consideration when performing balloon dilation procedures on transplant ureteral strictures, given the increased risk of leak away from the stricture. Its presence should prompt additional care during wire and catheter manipulations.

  7. Hygroscopic dilators vs balloon catheter ripening of the cervix for induction of labor in nulliparous women at term: Retrospective study

    OpenAIRE

    Shindo, Ryosuke; Aoki, Shigeru; Yonemoto, Naohiro; Yamamoto, Yuriko; Kasai, Junko; Kasai, Michi; Miyagi, Etsuko

    2017-01-01

    Objective To compare the efficacy and safety of hygroscopic dilators and balloon catheters for ripening of the cervix in induction of labor. Study design This retrospective, observational study used data from the Successive Pregnancy Birth Registry System of the Japan Society of Obstetrics and Gynecology from 2012 to 2014. Nulliparous women in whom labor was induced by mechanical methods of cervical ripening at term were enrolled. The eligible women were divided into dilator, balloon

  8. Transantral, endoscopically guided balloon dilatation of the ostiomeatal complex for chronic rhinosinusitis under local anesthesia.

    Science.gov (United States)

    Stankiewicz, James; Tami, Thomas; Truitt, Theodore; Atkins, James; Liepert, Douglas; Winegar, Bradford

    2009-01-01

    A multicenter study (BREATHE I - Entellus Medical, Inc.) was performed to assess the safety and outcomes of a new, less invasive system that uses direct endoscopic visualization to facilitate balloon dilation of the maxillary sinus ostia and ethmoid infundibulum. General anesthesia was avoided in most subjects to assess feasibility of performing transantral ostial dilatation in an office setting. Subjects with chronic rhinosinusitis of the maxillary sinuses alone or maxillary and anterior ethmoid sinuses underwent baseline evaluation including CT imaging and symptom assessment using the Sino-Nasal Outcome Test (SNOT 20). Subjects underwent transantral balloon dilation and follow-up evaluation at 1 week, 3 months, and 6 months post-procedure. Thirty subjects were treated at three centers. Fifty-five of 58 maxillary ostia were successfully treated for a procedural completion rate of 94.8%. Ninety-seven percent of the procedures were completed under local anesthesia with or without minimal intravenous sedation. There were no device-related serious adverse events or unanticipated adverse device effects. The mean overall SNOT 20 score at baseline was 2.9 +/- 1.0. Mean overall SNOT 20 scores at 1-week, 3-month, and 6-month follow-up were 0.8 +/- 0.8, 0.7 +/- 0.8, and 0.8 +/- 0.9 respectively. Patency at 3-months as confirmed by CT imaging was 95.8%. These results indicate that transantral balloon dilation of the ostiomeatal complex under local anesthesia appears to be a safe technique for managing isolated maxillary or maxillary and anterior ethmoid sinusitis and can potentially be performed safely in an office setting.

  9. Percutaneous balloon dilatation of stenotic calyceal diverticular infundibula in patients with recurrent urinary tract infections

    International Nuclear Information System (INIS)

    Keeling, Aoife N.; Wang, Tim T.; Lee, Michael J.

    2011-01-01

    Aim: Renal calyceal diverticula are usually detected as incidental findings on intravenous pyelograms (IVPs) and rarely manifest any clinical signs or symptoms. However, they can interfere with patient's quality of life in a number of instances causing pain, recurrent urinary tract infections (UTIs), abscess, systemic sepsis and calculus formation. The purpose of this study was to review the clinical indications, procedure technique and clinical outcome in all patients referred to Interventional Radiology for the percutaneous management of renal calyceal diverticula. Materials and methods: A retrospective review of all patients treated with percutaneous balloon dilatation of calyceal diverticular infundibula in the Interventional Radiology Department over a 10-year period was performed. Data collected included clinical details, laboratory indices, IVP and CT findings, procedure details and clinical outcome. Results: A total of three patients were treated over the course of the study period. All patients were young females who presented as a result of recurrent urinary tract infections. The calyceal diverticula were diagnosed incidentally on routine IVPs, with CT eloquently confirming the plain film findings in two cases. Technical procedure success was achieved in all cases, avoiding surgical intervention. Clinical follow-up revealed no further UTIs following dilatation. Conclusion: Fluoroscopic guided percutaneous balloon dilatation of renal calyceal diverticular infundibula following direct diverticular puncture is a safe and well tolerated method to reduce UTI and potentially avoid future stone formation.

  10. The Efficacy of Endoscopic Papillary Balloon Dilation for Patients with Acute Biliary Pancreatitis

    Directory of Open Access Journals (Sweden)

    Wei-Chih Sun

    2015-01-01

    Full Text Available Background. No study investigated the efficacy and safety of endoscopic papillary balloon dilation (EPBD for the treatment of acute biliary pancreatitis (ABP. Method. We retrospectively reviewed the effects of EPBD on patients with ABP from February 2003 to December 2012. The general data, findings of image studies, details of the procedure, and outcomes after EPBD were analyzed. Result. Total 183 patients (male/female: 110/73 were enrolled. The mean age was 65.9 years. Among them, 155 patients had mild pancreatitis. The meantime from admission to EPBD was 3.3 days. Cholangiogram revealed filling defects inside the common bile duct (CBD in 149 patients. The mean dilating balloon size was 10.5 mm and mean duration of the dilating procedure was 4.3 minutes. Overall, 124 patients had gross stones retrieved from CBD. Four (2.2% adverse events and 2 (1.1% intraprocedure bleeding incidents but no procedure-related mortality were noted. Bilirubin and amylase levels significantly decreased after EPBD. On average, patients resumed oral intake within 1.4 days. The clinical parameters and outcomes were similar in patients with different severity of pancreatitis. Conclusion. EPBD can be effective and safe for the treatment of ABP, even in patients presenting with severe disease.

  11. Percutaneous balloon dilatation of stenotic calyceal diverticular infundibula in patients with recurrent urinary tract infections

    Energy Technology Data Exchange (ETDEWEB)

    Keeling, Aoife N. [Department of Academic Radiology, Beaumont Hospital, Beaumont Road, Dublin 9 (Ireland); Wang, Tim T. [Department of Biosurgery and Surgical Technology, Surgical Epidemiology and Quality Unit, Imperial College London, St. Mary' s Hospital, London W2 1NY (United Kingdom); Lee, Michael J., E-mail: mlee@rcsi.ie [Department of Academic Radiology, Beaumont Hospital, Beaumont Road, Dublin 9 (Ireland)

    2011-02-15

    Aim: Renal calyceal diverticula are usually detected as incidental findings on intravenous pyelograms (IVPs) and rarely manifest any clinical signs or symptoms. However, they can interfere with patient's quality of life in a number of instances causing pain, recurrent urinary tract infections (UTIs), abscess, systemic sepsis and calculus formation. The purpose of this study was to review the clinical indications, procedure technique and clinical outcome in all patients referred to Interventional Radiology for the percutaneous management of renal calyceal diverticula. Materials and methods: A retrospective review of all patients treated with percutaneous balloon dilatation of calyceal diverticular infundibula in the Interventional Radiology Department over a 10-year period was performed. Data collected included clinical details, laboratory indices, IVP and CT findings, procedure details and clinical outcome. Results: A total of three patients were treated over the course of the study period. All patients were young females who presented as a result of recurrent urinary tract infections. The calyceal diverticula were diagnosed incidentally on routine IVPs, with CT eloquently confirming the plain film findings in two cases. Technical procedure success was achieved in all cases, avoiding surgical intervention. Clinical follow-up revealed no further UTIs following dilatation. Conclusion: Fluoroscopic guided percutaneous balloon dilatation of renal calyceal diverticular infundibula following direct diverticular puncture is a safe and well tolerated method to reduce UTI and potentially avoid future stone formation.

  12. Percutaneous balloon dilatation of stenotic calyceal diverticular infundibula in patients with recurrent urinary tract infections.

    LENUS (Irish Health Repository)

    Keeling, Aoife N

    2012-02-01

    AIM: Renal calyceal diverticula are usually detected as incidental findings on intravenous pyelograms (IVPs) and rarely manifest any clinical signs or symptoms. However, they can interfere with patient\\'s quality of life in a number of instances causing pain, recurrent urinary tract infections (UTIs), abscess, systemic sepsis and calculus formation. The purpose of this study was to review the clinical indications, procedure technique and clinical outcome in all patients referred to Interventional Radiology for the percutaneous management of renal calyceal diverticula. MATERIALS AND METHODS: A retrospective review of all patients treated with percutaneous balloon dilatation of calyceal diverticular infundibula in the Interventional Radiology Department over a 10-year period was performed. Data collected included clinical details, laboratory indices, IVP and CT findings, procedure details and clinical outcome. RESULTS: A total of three patients were treated over the course of the study period. All patients were young females who presented as a result of recurrent urinary tract infections. The calyceal diverticula were diagnosed incidentally on routine IVPs, with CT eloquently confirming the plain film findings in two cases. Technical procedure success was achieved in all cases, avoiding surgical intervention. Clinical follow-up revealed no further UTIs following dilatation. CONCLUSION: Fluoroscopic guided percutaneous balloon dilatation of renal calyceal diverticular infundibula following direct diverticular puncture is a safe and well tolerated method to reduce UTI and potentially avoid future stone formation.

  13. Design optimization of stent and its dilatation balloon using kriging surrogate model.

    Science.gov (United States)

    Li, Hongxia; Liu, Tao; Wang, Minjie; Zhao, Danyang; Qiao, Aike; Wang, Xue; Gu, Junfeng; Li, Zheng; Zhu, Bao

    2017-01-11

    Although stents have great success of treating cardiovascular disease, it actually undermined by the in-stent restenosis and their long-term fatigue failure. The geometry of stent affects its service performance and ultimately affects its fatigue life. Besides, improper length of balloon leads to transient mechanical injury to the vessel wall and in-stent restenosis. Conventional optimization method of stent and its dilatation balloon by comparing several designs and choosing the best one as the optimal design cannot find the global optimal design in the design space. In this study, an adaptive optimization method based on Kriging surrogate model was proposed to optimize the structure of stent and the length of stent dilatation balloon so as to prolong stent service life and improve the performance of stent. A finite element simulation based optimization method combing with Kriging surrogate model is proposed to optimize geometries of stent and length of stent dilatation balloon step by step. Kriging surrogate model coupled with design of experiment method is employed to construct the approximate functional relationship between optimization objectives and design variables. Modified rectangular grid is used to select initial training samples in the design space. Expected improvement function is used to balance the local and global searches to find the global optimal result. Finite element method is adopted to simulate the free expansion of balloon-expandable stent and the expansion of stent in stenotic artery. The well-known Goodman diagram was used for the fatigue life prediction of stent, while dogboning effect was used for stent expansion performance measurement. As the real design cases, diamond-shaped stent and sv-shaped stent were studied to demonstrate how the proposed method can be harnessed to design and refine stent fatigue life and expansion performance computationally. The fatigue life and expansion performance of both the diamond-shaped stent and sv

  14. Balloon dilatation biopsy of the biliary stricture through the percutaneous transhepatic biliary drainage tract: Feasibility and diagnostic accuracy

    Energy Technology Data Exchange (ETDEWEB)

    Hong, Ji Hoon; Ryeom, Hun Kyu; Jang, Yun Jin; Kim, Gab Chul; Cho, Seung Hyun; Song, Jung Hup [Kyungpook National University Hospital, Daegu (Korea, Republic of)

    2016-01-15

    To evaluate the feasibility and diagnostic accuracy of the balloon dilatation biopsy for the biliary stricture through the percutaneous transhepatic biliary drainage (PTBD) tract. The study included 35 patients who underwent balloon dilatation biopsy for the biliary stricture through the PTBD tract. Balloon dilatation was done with a balloon catheter of 10-mm or 12-mm diameter. Soft tissue adherent to the retrieved balloon catheter and soft tissue components separated by gauze filtration of evacuated bile were sampled for histopathologic examination. The results were compared with the final diagnosis which was made by clinical and imaging follow-up for mean 989 days (n = 34) and surgery with histopathologic examination (n = 1). Procedure-related complications and diagnostic accuracy were assessed. Tissues suitable for histopathologic examination were obtained in 31 out of 35 patients (88.6%). In 3 patients, self-limiting hemobilia was noted. No major complication was noted. The sensitivity, specificity, diagnostic accuracy, positive and negative predictive values for diagnosis of malignant stricture were 70.0%, 100%, 90.3%, 100%, and 87.5%, respectively. Balloon dilatation biopsy of the biliary stricture through the PTBD tract is a feasible and accurate diagnostic method. It can be a safe alternative to the endoscopic retrograde cholangiography biopsy or forceps biopsy through the PTBD tract.

  15. Balloon dilatation in patients with gastric outlet obstruction related to peptic ulcer disease.

    Science.gov (United States)

    Hamzaoui, Lamine; Bouassida, Mahdi; Ben Mansour, Imed; Medhioub, Mouna; Ezzine, Heykal; Touinsi, Hassen; Azouz, Mohamed M

    2015-01-01

    Gastric outlet obstruction (GOO) is a rare complication of peptic ulcer disease (PUD). The endoscopic balloon dilatation (EBD) associated with medical treatment of Helicobacter pylori is a successful method in the management of pyloric stenosis. The aim of this study was to describe epidemiological, clinical, and endoscopic characteristics of GOO related to PUD and to evaluate the effectiveness, safety, and outcome of EBD. In a retrospective study of patients seen between 1999 and 2009 with symptoms of GOO secondary to PUD, pyloro-bulbar stenosis was confirmed by endoscopic examination. Balloon dilatation was performed when obstruction persisted after treatment with double-dose proton-pump inhibitor (PPI) intravenously for 7-10days. The H. pylori status was assessed with histology, and eradication therapy was prescribed for infection. A total of 45 consecutive patients (38 males, 7 females median age, 51.9years; range, 20-58years) with symptoms of GOO secondary to PUD underwent EBD. Median follow-up time of the 45 patients was 32months (range, 4-126months). The immediate success rate of the procedure was 95.5%. Clinical remission was noted in 84.4% of the patients. Remission without relapse was observed in 55.8%, 30months after the dilatation. Pyloric stenosis relapsed in 15 patients (39.5%) after a median period of 22.9months. The dilatation was complicated in three patients (6.7%, two perforations and one bleeding). A total of 13 patients (29%) underwent surgery. H. pylori was found to be positive in 97.7% of the patients, and was eradicated in 78.4% of them. Smoking and failure of H. pylori eradication were associated with the relapse of the stenosis. EBD is a simple, effective, and safe therapy for the GOO related to PUD, producing short- and long-term remission. Copyright © 2015 Arab Journal of Gastroenterology. Published by Elsevier B.V. All rights reserved.

  16. Endoscopic papillary balloon dilation for a 7-year-old girl with choledocholithiasis.

    Science.gov (United States)

    Sogo, Tsuyoshi; Kondo, Takeo; Tsunoda, Tomoyuki; Murayama, Akitoshi; Komatsu, Haruki; Inui, Ayano; Fujisawa, Tomoo

    2013-04-01

    A 7-year-old girl was referred to our hospital for severe abdominal pain and elevated serum levels of amylase and aminotransferase. Radiological examinations revealed choledocholithiasis. EPBD was performed under intravenous anesthesia using midazolam and ketamine chloride. After fluoroscopic confirmation of a bile duct stone, a dilation balloon (30 mm-long, 8 mm-diameter) was passed over the guidewire and placed across the papilla. The balloon was gradually inflated until the notch created by the papillary sphincter disappeared. At 4 atm, the notch disappeared and the pressure was maintained for 15 s. Stone extraction was performed by using a retrieval balloon catheter. Abdominal pain disappeared immediately after EPBD, and she resumed oral intake 2 days after EPBD. In conclusion, EPBD may be a safe and effective technique for the treatment of choledocholithiasis in pediatric patients. EPDB should be selected as a treatment for pediatric choledocholithiasis in view of its advantages of preserving papillary function. © 2013 The Authors. Pediatrics International © 2013 Japan Pediatric Society.

  17. Clinical significance of balloon dilatation angiography during cerebral venous sinus stenosis stenting

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    Xiang-yu CAO

    2016-12-01

    Full Text Available Objective To explore the clinical significance of balloon dilatation angiography during cerebral venous sinus stenosis stenting to predict the reflux of perforator veins after operation. Methods A total of 93 patients (including 51 with cerebral venous sinus stenosis and intracranial hypertension and 42 with intractable pulsatile tinnitus caused by cerebral venous sinus stenosis who were treated by stent implantation were analyzed retrospectively. Among those patients, the diameter of transverse and sigmoid sinuses of 63 cases were measured based on angiography, and stent was selected according to the measurement result. The other 30 cases were given angiography on ipsilateral carotid artery or vertebral artery when the balloon was dilated in the venous sinus to confirm the reflux of perforator veins. If the venous reflux decreased in the angiography, stent with diameter 1-2 mm less than that of venous sinus could be selected.  Results The success rate of stenting was 100% (93/93. In 63 cases, 45 cases were planted 9 mm × 40 mm stents, 15 were planted 8 mm × 40 mm stents, 3 were planted 7 mm × 40 mm stents. The average diameter of stents was (8.67 ± 0.68 mm. There were 11 cases (17.46% with slow perforator venous reflux after operation. In the other 30 cases, 3 cases were planted 8 mm × 40 mm stents, 11 were planted 7 mm × 40 mm stents, and 16 were planted 6 mm × 40 mm stents. The average diameter of stents was (7.57 ± 0.67 mm. There was only one case (3.33% with slow perforator venous reflux after operation. The difference of stent diameter between 2 groups was statistically significant (t = 15.632, P = 0.001. The occurrence rate of perforator vein occlusion after operation between 2 groups was significantly different (adjusted χ 2 = 60.065, P = 0.001.  Conclusions Perforator vein occlusion after cerebral venous sinus stenting is common complication. Balloon dilatation angiography could predict the possibility of perforator vein

  18. Treatment of Ureterointestinal Anastomotic Strictures by Diathermal or Cryoplastic Dilatation

    International Nuclear Information System (INIS)

    Orsi, Franco; Penco, Silvia; Matei, Victor; Bonomo, Guido; Vigna, Paolo Della; Monfardini, Lorenzo; Cobelli, Ottavio De

    2007-01-01

    Background. Ureterointestinal anastomotic strictures (UAS) complicate 10-15% of surgeries for urinary diversion and are the main cause of deterioration in renal function. Treatments are surgical revision, management with autostatic stent, balloon dilatation, endoscopic incision, and percutaneous transrenal diathermy (Acucise). A new option is cryoplastic dilatation (Polar-Cath). Purpose. To assess the feasibility, complications, and preliminary results of UAS treatment using the Acucise and Polar-Cath systems. Methods. Nineteen UAS, diagnosed by ultrasonography or computed tomography and sequential renal scintigraphy, occurred in 15 cancer patients after radical cystectomy and urinary diversion. Fifteen were managed with balloon diathermy and 4 by balloon cryoplasty in a three-stage procedure-percutaneous nephrostomy, diathermal or cryoplastic dilatation, and transnephrostomic control with nephrostomy removal-each separated by 15 days. All patients gave written informed consent. Results. Dilatations were successful in all cases. The procedure is simple and rapid (about 45 min) under fluoroscopic control and sedation. Procedural complications occurred in 1 (5%) patient with UAS after Wallace II uretero-ileocutaneostomy: a common iliac artery lesion was induced by diathermal dilatation, evident subsequently, and required surgical repair. Patency with balloon diathermy was good, with two restenoses developing over 12 months (range 1-22) of follow-up. With balloon cryoplastic dilatation, one restenosis developed in the short term; follow-up is too brief to assess the long-term efficacy. Conclusion. Our short-term results with diathermal and cryoplastic dilatation to resolve UAS are good. If supported by longer follow-up, the techniques may be considered as first-choice approaches to UAS. Surgery should be reserved for cases in which this minimally invasive technique fails

  19. Endoscopic papillary balloon dilatation in comparison with endoscopic sphincterotomy for the treatment of large common bile duct stone

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    Mahammad Minakari

    2013-01-01

    Conclusions: EPBD with 15-mm dilator balloon appears to be equally safe and effective compared with EST for removal of large CBD stones. So because of low complication and high success rate we recommend EPBD as the preferred method for removal of large (10-20 mm CBD stones.

  20. In vitro balloon dilatation of mitral valve stenosis: the importance of subvalvar involvement as a cause of mitral valve insufficiency

    NARCIS (Netherlands)

    Sadee, A. S.; Becker, A. E.

    1991-01-01

    To investigate the mechanism that increases the orifice area of the mitral valve during balloon dilatation 43 surgically excised intact rheumatic mitral valves were studied. The main pathological features were (a) fibrosis of mitral valve leaflets and commissures (10 valves); (b) fibrosis with

  1. Balloon Dilatation of Esophageal Strictures in Children With Bullous Epidermolysis: Description of Case Series

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    A. V. Tupylenko

    2017-01-01

    Full Text Available Esophageal strictures are the most common complications of bullous epidermolysis in children. Strictures cause the development of dysphagia that prevents oral alimentation and receipt of an adequate amount of nutrients that is accompanied by a violation of nutritional status, weight loss, and delayed physical development of a child. Disturbed swallowing can also cause aspiration syndrome, pneumonia, and airway obstruction. To eliminate dysphagia and reduce the risk of complications, it is necessary to restore esophageal patency. The article describes the results of X-ray with assisted balloon dilatation in 19 children with bullous epidermolysis and dysphagia. It is shown that this method of esophagus recanalization allows to effectively and safely restore oral alimentation of children already in the first day after intervention with a gradual expansion of the diet.

  2. The impact of balloon catheter dilation on frequency of sinus surgery in the United States

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    Holy CE

    2014-04-01

    Full Text Available Chantal E Holy,1 John M Ellison,1 Charles Schneider,1 Howard L Levine2,3 1Health Economics and Reimbursement, 2Medical Affairs, Acclarent Inc., a Johnson & Johnson Company, Menlo Park, CA, USA; 3Cleveland Nasal-Sinus and Sleep Center, Cleveland, OH, USA Purpose: Endoscopic sinus surgery for patients with chronic rhinosinusitis (CRS unresponsive to medical therapy has traditionally been performed under general anesthesia and in the operating room. Balloons for catheter dilation of paranasal sinuses were introduced in 2005, allowing sinus surgery to be safely performed either in the operating room or the office care setting, under local anesthesia. This change in care setting has raised concerns of overuse or expanded indications for sinus surgery. This study was thus designed to evaluate changes in surgical volumes in the United States, for the period 2006–2011, and to evaluate the impact of the sinus balloons on surgical practice. Methods: The MarketScan® Commercial Claims and Encounter Database was queried for the period 2006 to 2011 using CRS International Classification of Diseases, Ninth Revision codes (473.X and sinus surgery US-based Common Procedural Terminology (CPT codes (endoscopic sinus surgery: CPT codes 31254–31294 and 31299; balloon catheter dilation: CPT codes 31295–31297. MarketScan's projection methodology was applied to estimate the nationwide prevalence of CRS and the incidence of sinus surgery. Procedural case mix and total average payment per surgery were analyzed. Results: From 2006 to 2011, the yearly prevalence of CRS and sinus surgery volume remained flat with ~430 patients with CRS per 100,000 in the employer-sponsored insured population, of which ~117/100,000 underwent surgery. In 2006, 2.69 paranasal sinuses (95% confidence interval [95% CI]: 2.65–2.71 were treated during each individual sinus surgery, with an additional 1.11 nasal procedures (95% CI: 1.08–1.13 performed concurrently. By 2011, the

  3. Prospective evaluation of an indwelling esophageal balloon dilatation feeding tube for treatment of benign esophageal strictures in dogs and cats.

    Science.gov (United States)

    Tan, Desmond K; Weisse, Chick; Berent, Allyson; Lamb, Kenneth E

    2018-03-01

    Despite multiple dilatation procedures, benign esophageal strictures (BES) remain a recurring cause of morbidity and mortality in dogs and cats. Investigate the use of an indwelling Balloon Dilatation esophagostomy tube (B-Tube) for treatment of BES in dogs and cats. Nine dogs and 3 cats. Animals with BES were recruited for our prospective study. Endoscopic and fluoroscopic evaluation of the esophagus and balloon dilatation were performed under general anesthesia, followed by placement of an indwelling B-Tube. The animals' owners performed twice daily at-home inflations for approximately 6 weeks. Repeat endoscopy was performed before B-Tube removal. Animals were reevaluated for changes in modified dysphagia score (MDS) after B-Tube removal. The B-Tube management was relatively well tolerated and effective in maintaining dilatation of a BES while in place. These animals underwent a median of 2 anesthetic episodes and were monitored for a median of 472 days (range, 358-1736 days). The mean MDS before treatment was 3.1 ± 0.5/4.0 and final follow-up MDS were significantly (P dog died. The B-Tube offers an effective, and more economical method, and often decreased anesthetic time to repeated balloon dilatation procedures for the treatment of BES in dogs and cats. Copyright © 2018 The Authors. Journal of Veterinary Internal Medicine published by Wiley Periodicals, Inc. on behalf of the American College of Veterinary Internal Medicine.

  4. Simple balloon dilation for drug-eluting in-stent restenosis: An optical coherent tomography analysis

    Energy Technology Data Exchange (ETDEWEB)

    Arikawa, Ryo [Division of Cardiology, Tenyoukai Central Hospital, Izumi-cho, Kagoshima City, Kagoshima (Japan); Yamaguchi, Hiroshi, E-mail: hyamaguchi@tsm.bbiq.jp [Division of Cardiology, Tenyoukai Central Hospital, Izumi-cho, Kagoshima City, Kagoshima (Japan); Takaoka, Junichiro; Miyamura, Akihiro; Atsuchi, Nobuhiko; Ninomiya, Toshiko; Atsuchi, Yoshihiko [Division of Cardiology, Tenyoukai Central Hospital, Izumi-cho, Kagoshima City, Kagoshima (Japan); Ohishi, Mitsuru [Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Science, Kagoshima University, Kagoshima (Japan); Terashima, Mitsuyasu [Department of Cardiology, Toyohashi Heart Center, Toyohashi (Japan); Kaneda, Hideaki [Okinaka Memorial Institute for Medical Research, Tokyo (Japan)

    2015-01-15

    Background: Although drug-eluting stent (DES) has significantly reduced restenosis, the treatment of DES-in-stent restenosis (ISR) remains a challenge with high restenosis rate. Methods: We examined whether morphologic appearance of restenosis tissue by optical coherent tomography (OCT) had an impact on outcomes after balloon angioplasty for DES-ISR. The morphologic appearance of restenosis tissue was qualitatively assessed for tissue structures such as homogeneous, layered, and heterogeneous patterns. Results: Using OCT, 50 patients with DES-ISR were divided into 2 groups: 25 lesions with homogeneous or layered patterns (homo/layered group) and 25 lesions with heterogeneous patterns (hetero group). Acute gain was larger in the hetero group (1.33 ± 0.41 mm vs. 1.06 ± 0.32 mm in the homo/layered group, P = 0.03). On intravascular ultrasound analysis, post-procedural percent neointimal area was smaller in the hetero group (27.4 ± 9.2% vs. 34.0 ± 11.2% in the homo/layered group, P = 0.05). Angiographic follow-up was performed in 37 lesions (74%). Follow-up minimal lumen diameter was larger in the hetero group (1.75 ± 0.89 mm vs. 1.01 ± 0.81 mm in the homo/layered group, P = 0.04). Target lesion revascularization rates tended to be lower in the hetero group (20% vs. 43% in the homo/layered group, P = 0.12). Conclusions: Balloon angioplasty was more effective for DES-ISR with heterogeneous tissue appearance than DES-ISR with homogeneous/layered tissue appearance. OCT assessment of DES-ISR morphology may be a useful adjunct in determining clinical strategies. Simple balloon dilatation is a possible treatment strategy for DES-ISR lesions with a heterogeneous appearance on OCT images.

  5. Endoscopic papillary large balloon dilation alone without sphincterotomy for the treatment of large common bile duct stones

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    Chen Wen-Chi

    2011-06-01

    Full Text Available Abstract Background Lethal pancreatitis has been reported after treatment for common bile duct stones using small endoscopic papillary balloon dilation. Methods We retrospectively evaluated the safety and efficacy of using large balloon dilation alone without the use of sphincterotomy for the treatment of large common bile duct stones in Kaohsiung Veterans General Hospital. Success rate of stone clearance, procedure-related adverse events and incidents, frequency of mechanical lithotripsy use, and recurrent stones were recorded. Results A total of 247 patients were reviewed in the current study. The mean age of the patients was 71.2 years. Most of them had comorbidities. Mean stone size was 16.4 mm. Among the patients, 132 (53.4% had an intact gallbladder and 121 (49% had a juxtapapillary diverticulum. The mean size of dilating balloon used was 13.2 mm. The mean duration of the dilating procedure was 4.7 min. There were 39 (15.8% patients required the help of mechanical lithotripsy while retrieving the stones. The final success rate of complete retrieval of stones was 92.7%. The rate of pancreatic duct enhancement was 26.7% (66/247. There were 3 (1.2% adverse events and 6 (2.4% intra-procedure bleeding incidents. All patients recovered completely after conservative and endoscopic treatment respectively, and no procedure-related mortality was noted. 172 patients had a follow-up duration of more than 6 months and among these, 25 patients had recurrent common bile duct stones. It was significantly correlated to the common bile duct size (p = 0.036 Conclusions Endoscopic papillary large balloon dilation alone is simple, safe, and effective in dealing with large common bile duct stones in relatively aged and debilitated patients.

  6. Comparison of endoscopic papillary balloon dilation and sphincterotomy in young patients with CBD stones and gallstones.

    Science.gov (United States)

    Seo, Yu Ri; Moon, Jong Ho; Choi, Hyun Jong; Kim, Dong Choon; Ha, Ji Su; Lee, Tae Hoon; Cha, Sang-Woo; Cho, Young Deok; Park, Sang-Heum; Kim, Sun-Joo

    2014-05-01

    Endoscopic biliary sphincterotomy (EBS) results in permanent loss of sphincter function and its long-term complications are unknown. Endoscopic papillary balloon dilation (EPBD) is an alternative procedure that preserves sphincter function, although it is associated with a higher risk of pancreatitis than is EBS. The aim of this study was to evaluate the safety and outcomes of EPBD with limited indications for removal of common bile duct (CBD) stones combined with gallstones in patients younger than 40 years. Young (age CBD stones combined with gallstones on imaging studies were enrolled in this study. A total of 132 patients were randomly divided into the EPBD group (n = 62) or the EBS group (n = 70) for extraction of CBD stones. The ballooning size of EPBD ranged from 6 to 10 mm. Complete bile duct clearance was achieved in 98.4 % (61/62) of the EPBD group and 100 % (70/70) of the EBS group. Mechanical lithotripsy was required in 8.1 % (5/62) of the EPBD group and 8.6 % (6/70) of the EBS group. The early complication rates were 8.1 % (5/62) (five pancreatitis) in the EPBD group and 11.4 % (8/70) (five [7.1 %] pancreatitis, two bleeding and one perforation) in the EBS group. The recurrence rates of CBD stones were 1.6 % (1/62) in the EPBD group and 5.7 % (4/70) in the EBS group. EPBD with limited indications was safe and effective as EBS for removal of CBD stones combined with gallstones in young patients who had a longer life expectancy.

  7. Elimination of Postoperative Pyloric Stricture by Endoscopic Electrocauterization and Balloon Dilatation in an Infant With Congenital Antral Web

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    Hsun-Chin Chao

    2011-04-01

    Full Text Available We, herein, report a male infant who presented with recurrent pyloric stricture after two surgeries (web excision and antropyloroplasty, which were done, respectively, at 5 days of age for congenital antral web and 6 months of age for the subsequent pyloric stricture. The patient suffered from anorexia, progressed vomiting, and weight loss gradually after the first and second surgeries, and then, endoscopy revealed severe pyloric deformity and stricture. Poor inflation was noted during endoscopic balloon dilatation because of tight pylorus; a subsequent electrocauterization and balloon dilatation were done, and the patient’s clinical symptoms improved significantly 2 weeks later. A follow-up endoscopy was performed 1 month and 12 months after endoscopic therapy, showing steady regression of pyloric stricture. The patient had adequate diet intake and growth in the later 12 months.

  8. Endoscopic partial sphincterotomy coupled with large balloon papilla dilation – Single stage approach for management of extra-hepatic bile ducts macro-lithiasis

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    Gianfranco Donatelli

    2014-01-01

    We conclude that endoscopic partial sphincterotomy plus large papillary balloon dilation seems a promising, effective and safe approach to treat giant extrahepatic biliary calculi, if performed after correct patient selection and under established guidelines.

  9. Usefulness of a hook in nasolacrimal balloon dilatation and stent placement

    International Nuclear Information System (INIS)

    Kim, Tae Hyung; Song, Ho Young; Son, Jin Hyun; Park, Sang Soo

    1996-01-01

    To evaluate the usefulness of a hook developed for pulling out the guide wire in nasolacrimal balloon dilatation and stent placement. The head was made of stainless steel wire in a shape of a question mark, and the body was made of four stainless steel pipes. The head was attached to the body in three different ways:A) the head was anterior to the body, B) the head was posterior to the body, and C) the head was angled of 30 degrees forward from the direction of the body. 90 epiphora patients took part in a test to compare and evalvate the usefulness of different types of hook. Average number of trials, success rate and average time of the procedure were recorded. The average trial number for different attachment methods A, B, and C was 4.5, 6.4, and 2.5, respectively, and the success rate 83, 70, and 97%, respectively. The average time of the procedure was 31 minutes. The C type hook was the most effective, and the new technique using the hook was more convenient and time-saving than the old technique using a nasal endoscopy

  10. Endoscopic papillary balloon dilatation versus endoscopic sphincterotomy in the treatment for choledocholithiasis: a meta-analysis.

    Science.gov (United States)

    Liu, Yangyang; Su, Peizhu; Lin, Siheng; Xiao, Kun; Chen, Pingyan; An, Shengli; Zhi, Fachao; Bai, Yang

    2012-03-01

    Endoscopic papillary balloon dilatation (EPBD) and endoscopic sphincterotomy (EST) are two common nonsurgical treatments endoscopic retrograde cholangiopancreatography (ERCP) for choledocholithiasis. The aim of this study was to compare the efficacy and safety of EPBD and EST in the treatment for choledocholithiasis, confining the analysis to work reported in the last decade. The rate of overall postoperative complications was chosen as the primary outcome, and 10 other outcomes were secondary outcomes. Relative risk (RR) or Peto odds ratio (OR) were computed as the measures of pooled effects. We planned sensitivity analyses a priori for examining the change in robustness of the sensitivity to excluding studies with some inappropriate objects, technique defects or without full-text acquisition. For complete stone removal, EPBD was similar to EST (95% vs. 96%, P = 0.36) and overall postoperative complications (14.0% vs. 11.7%, P = 0.53). The incidence of post-ERCP cholangitis (2.5% vs. 1.8%, P = 0.40), basket impaction (0.9% vs. 0%, P = 0.16) and perforation (0.0% vs. 0.4%, P = 0.17) were equivalent between EPBD and EST. On the other hand, EPBD caused more post-ERCP pancreatitis (PEP) (9.4% vs. 3.3%, P stone extraction, though it requires more endoscopic mechanical lithotripsy (EML). EPBD may outweigh EST for patients with coagulopathy; however, it may cause more PEP. © 2011 Journal of Gastroenterology and Hepatology Foundation and Blackwell Publishing Asia Pty Ltd.

  11. Naso-lacrimal duct balloon dilatation: Medium to long term follow-up

    International Nuclear Information System (INIS)

    McCullough, K. Mark

    2001-01-01

    AIM: Subjective patient response to nasolacrimal duct balloon dilatation (dacryocystoplasty) for epiphora due to primary acquired nasolacrimal duct obstruction (PANDO), was sought over the medium to long term. The relevant dacryocystograms were reviewed to assess the relationship between treatment outcome and dacryocystographic appearances. MATERIALS AND METHODS: Sixty-three patients who had, in the preceding 12-month to 8-year period, undergone 102 dacryocystoplasties were sent a postal questionnaire in which subjective response to treatment was requested. Fifty-seven original dacryocystograms were reviewed by the author and the appearances of the lacrimal sacs subjectively assessed. RESULTS: The results showed that in 31% of respondents (total response 48/63, 76%) dacryocystoplasty was ineffective for treatment of PANDO. Treatment failures did not respond to repeat treatment. Sixty-nine per cent of patients considered themselves either cured or improved by the treatment, with a minimal relapse rate during the period studied. The original dacryocystoplasty appearances were unhelpful in predicting treatment response. CONCLUSION: Dacryocystoplasty can be expected to relieve or improve epiphora in 69% patients with PANDO, (incomplete obstruction) and favourable response to treatment is durable in the medium to long term. Repeat treatment is not recommended for those who fail to respond, though may be appropriate for cases of temporary response. The technique is safe and well tolerated. McCullough, K.M. (2001). Clinical Radiology 56, 13-16

  12. Balloon Dilatation for Corrosive Esophageal Strictures in Children: Radiologic and Clinical Outcomes

    International Nuclear Information System (INIS)

    Youn, Byung Jae; Kim, Woo Sun; Cheon, Jung Eun; Kim, Wha Young; Shin, Su Mi; Kim, In One; Yeon, Kyung Mo

    2010-01-01

    We retrospectively evaluated the effectiveness of the esophageal balloon dilatation (EBD) in children with a corrosive esophageal stricture. The study subjects included 14 patients (M:F = 8:6, age range: 17-85 months) who underwent an EBD due to a corrosive esophageal stricture. The causative agents for the condition were glacial acetic acid (n = 9) and lye (n = 5). A total of 52 EBD sessions were performed in 14 patients (range 1-8 sessions). During the mean 15-month follow-up period (range 1-79 months), 12 patients (86%) underwent additional EBD due to recurrent esophageal stricture. Dysphagia improved after each EBD session and oral feeding was possible between EBD sessions. Long-term success (defined as dysphagia relief for at least 12 months after the last EBD) was achieved in two patients (14%). Temporary success of EBD (defined as dysphagia relief for at least one month after the EBD session) was achieved in 17 out of 52 sessions (33%). A submucosal tear of the esophagus was observed in two (4%) sessions of EBD. Only a limited number of children with corrosive esophageal strictures were considered cured by EBD. However, the outcome of repeated EBD was sufficient to allow the children to eat per os prior to surgical management

  13. Efficacy and safety in performing of large bore percutaneous nephrostomy under ultrasound guidance

    International Nuclear Information System (INIS)

    Smilov, N.; Mlachkova, D.; Rizov, A.; Lozev, I.

    2009-01-01

    The aim of the study was to compare the success rate, complications and the outcomes from large-bore percutaneous nephrostomy under ultrasound guidance performed to 178 cases with another 54 when nephrostomy under x-ray control was performed. We have performed 178 large-bore percutaneous nephrostomy under ultrasound guidance and another 54 percutaneous nephrostomy under x-ray guidance to patients diagnosed with obstructive uropathy resulting from benign or malignant supravesical obstruction. We have performed successful nephrostomy in 93,8% of the cases under ultrasound guidance and 100% successful nephrostomy in the cases under x-ray control. In 2,8% of patients under ultrasound guidance the nephrostomy was performed using 4 additional punctures of the pyelocaliceal system and artificially caused hydronephrosis via infiltration of normal saline; and in the remaining 1,7% it was successful at the second attempt after 24 hours. It was not necessary to perform open surgery nephrostomy in any of the cases. The performance of percutaneous nephrostomy under ultrasound guidance has a success rate similar to the one done under x-ray guidance and with commensurable frequency and severity of complications, however without the patient and the operator being exposed to x-ray radiation. In general, the percutaneous nephrostomy under ultrasound guidance is performed without difficulties in the cases of third or fourth degree hydronephrosis. The lateral decubital patient position, the appropriate place for the puncture, the usage of Color Doppler imaging when the puncture is performed and the continuos ultrasound guidance during dilatation and placement of the nephrostomy tube should ensure the successful performance of the procedure in the case of first or second degree hydronephrosis. When hydronephrosis is absent, the nephrostomy should be performed under x-ray guidance. In emergency cases the application of ultrasound guidance allows the nephrostomy to be performed along the

  14. [Balloon dilatation of the cartilaginous portion of the Eustachian tube in the children presenting with relapsing exudative otitis media].

    Science.gov (United States)

    Burova, O V; Bogomil'sky, M R; Polunin, M M; Soldatsky, Yu L

    2016-01-01

    The objective of the present study was to evaluate the effectiveness and the safety of balloon dilatation of the cartilaginous portion of the Eustachian tube in the children presenting with relapsing exudative otitis media. A total of 15 children (22 ears) at the age from 3 to 16 years suffering from relapsing exudative otitis media over 18 months in duration were available for the examination. Neither conservative nor surgical treatment produced any stable beneficial effect in these patients. Acoustic impedancometry yielded type B tympanograms. All the children were treated with the use of balloon dilatation of the cartilaginous portion of the Eustachian tube under endotracheal anesthesia. The follow-up examination carried out within 6--8 weeks after the treatment revealed the complete recovery of the function of the middle ear (type A tympanograms) in 11 (73.3%) children. Partial restoration of this function (as evidenced by type C tympanogram) was documented in 4 children. These patients underwent the second course of conservative therapy that resulted in the complete restoration of the function of the middle ear. It is concluded that balloon dilatation of the cartilaginous portion of the Eustachian tube in the children presenting with relapsing exudative otitis media provides the efficient and safe approach to the management of this condition. Being a minimally invasive method, it has good prospects for the practical application and is worth further investigation.

  15. Clinical, manometric, and ultrasonographic results of pneumatic balloon dilatation vs. lateral internal sphincterotomy for chronic anal fissure: a prospective, randomized, controlled trial.

    Science.gov (United States)

    Renzi, Adolfo; Izzo, Domenico; Di Sarno, Giandomenico; Talento, Pasquale; Torelli, Francesco; Izzo, Giuseppe; Di Martino, Natale

    2008-01-01

    This prospective, randomized, controlled trial was designed to compare the clinical, functional, and morphologic results of pneumatic balloon dilatation with lateral internal sphincterotomy for the treatment of chronic anal fissure. All patients with symptomatic chronic anal fissure were randomly assigned to pneumatic balloon dilatation or lateral internal sphincterotomy and invited to complete a standardized questionnaire inquiring about their symptoms. Anal ultrasonography and anal manometry were performed before and six months after surgery. A proctologic examination was performed between the fifth and sixth postoperative weeks. Anal continence, scored by using a validated continence grading scale, was evaluated preoperatively at 1 and 6 weeks and at 12 and 24 months. Fifty-three patients, who satisfied selection criteria, were enrolled in the trial. Four patients (7.5 percent) were lost to follow-up. Twenty-four patients (11 males; mean age, 42 +/- 8.2 years) underwent pneumatic balloon dilatation and 25 patients (10 males; mean age, 44 +/- 7.3 years) underwent lateral internal sphincterotomy. Fissure-healing rates were 83.3 percent in the pneumatic balloon dilatation and 92 percent in the lateral internal sphincterotomy group. Recurrent anal fissure was observed in one patient (4 percent) after lateral internal sphincterotomy. At anal manometry, mean resting pressure decrements obtained after pneumatic balloon dilatation and lateral internal sphincterotomy were 30.5 and 34.3 percent, respectively. After pneumatic balloon dilatation, anal ultrasonography did not show any significant sphincter damage. At 24-month follow-up, the incidence of incontinence, irrespective of severity, was 0 percent in the pneumatic balloon dilatation group and 16 percent in the lateral internal sphincterotomy group (P < 0.0001). As lateral internal sphincterotomy, pneumatic balloon dilatation grants a high anal fissure-healing rate but with a statistically significant reduction in

  16. [Combination of the ureteral dilation catheter and balloon catheter under the ureteroscope in the treatment of male urethral stricture].

    Science.gov (United States)

    Zhou, Yi; Li, Gong-hui; Yan, Jia-jun; Shen, Cong; Tang, Gui-hang; Xu, Gang

    2016-01-01

    To investigate the clinical application of the ureteral dilation catheter combined with the balloon catheter under the ureteroscope in the treatment of urethral stricture in men. Under the ureteroscope, 45 male patients with urethral stricture received placement of a zebra guide wire through the strictured urethra into the bladder and then a ureteral dilation catheter along the guide wire, followed by dilation of the urethra from F8 initially to F14 and F16. Again, the ureteroscope was used to determine the length of the strictured urethra, its distance to the external urethral orifice, and whether it was normally located. An F24 balloon catheter and then a metal urethral calibrator was used for the dilation of the strictured urethra. After removal of the F18-F22 urethral catheter at 8 weeks, the urinary flow rate was measured immediately and again at 3 months. All the operations were successfully performed without serious complications. The maximum urinary flow rate was (13.3-29.9) ml/s (mean [17.7 ± 3.2] ml/s) at the removal of the catheter and (15.2-30.8) ml/s (mean [19.8 ± 3.9] ml/s) at 3 months after it. Smooth urination was found in all the patients during the 6-24 months follow-up. The application of the ureteral dilation catheter combined with, the balloon catheter under the ureteroscope is a good option for the treatment of male urethral stricture for its advantages of uncomplicatedness, safety, effectiveness, few complications, less pain, high success rate, and repeatable operation.

  17. Does preserved sphincter of Oddi function prevent common bile duct stones recurrence in patients after endoscopic papillary balloon dilation?

    Directory of Open Access Journals (Sweden)

    Tzung-Jiun Tsai

    2018-04-01

    Full Text Available Background: Whether preserving sphincter of Oddi (SO function by endoscopic papillary balloon dilation (EPBD is beneficial for preventing recurrent common bile duct stone disease (CBDS is controversial. The aim of this study was to measure sphincter of Oddi (SO function by using SO manometry, and to evaluate the association with recurrent CBDS. Methods: Patients with suspected CBDS who underwent successful EPBD were included. These patients underwent SO manometry at two months after EPBD with bile duct clearance. They were regularly followed for recurrent CBDS. Results: From January 2000 to December 2009, 185 patients received EPBD and SO manometry was included. There were 64% male with mean age of 65 ± 15.6 years. Mean ballooning inflation size was 1.1 ± 0.19 cm and mean ballooning time was 4.5 ± 0.85 min 55.7% had a sphincter of Oddi basal pressure (SOBP of 0 mmHg, 16.2%  40 mmHg. In multivariate analysis, EPBD with balloon ≥1.2 cm was the only factor for loss of SO function. Moreover, patients with preserved SO function had higher stone recurrence rate (15% vs. 5%, p = 0.034. Conclusion: EPBD using balloon ≥1.2 cm is a major factor for loss of SO function, which seems to reduce the risk of recurrent CBD stones. Keywords: Common bile duct stone, Endoscopic papillary balloon dilation, Sphincter of Oddi manometry

  18. Membrane-like structure in the urinary bladder neck of a young cat: diagnosis and treatment using balloon dilatation and a balloon-expandable metallic stent

    Directory of Open Access Journals (Sweden)

    Matias Ruiz-Drebing

    2017-10-01

    Full Text Available Case summary A 33-month-old, spayed female domestic shorthair cat was referred to the Animal Health Trust for the investigation of urinary incontinence and straining to urinate. A membrane-like structure was detected in the bladder neck, which caused partial obstruction of the urinary bladder. A combination of different imaging techniques, including ultrasonography, radiography, CT and fluoroscopy, was essential in the diagnosis, surgical planning and treatment of this intravesicular stricture. During retrograde vaginourethrocystogram, unexpected subcapsular accumulation of contrast medium was seen around both kidneys on radiographs and confirmed with CT. Three different treatments were performed, including surgical debridement, balloon dilatation and placement of a self-expanding metallic stent across the stricture. Histopathology of the membrane was unable to differentiate whether the lesion was congenital or acquired. No urinary incontinence was observed 5 months after placement of the metallic stent. Relevance and novel information This is the first reported case using fluoroscopic-guided balloon dilatation of the bladder neck for the treatment of a bladder neck stricture. Presence of renal subcapsular contrast medium secondary to a retrograde vaginourethrocystogram due to partial obstruction at the bladder neck in a cat has not been previously described.

  19. Randomized Comparison of Final Kissing Balloon Dilatation Versus No Final Kissing Balloon Dilatation in Patients With Coronary Bifurcation Lesions Treated With Main Vessel Stenting. Five Year Clinical Outcome in The Nordic-Baltic Bifurcation Study III

    DEFF Research Database (Denmark)

    Niemelä, Matti; Holm, Niels R; Kervinen, Kari

    2015-01-01

    Background- It is unknown whether the preferred 1-stent bifurcation stenting approach with stenting of the main vessel (MV) and optional side branch stenting using drug-eluting stents should be finalized by a kissing balloon dilatation (FKBD). Therefore, we compared strategies of MV stenting...... angiographic side branch (re)stenosis, especially in patients with true bifurcation lesions. The simple no-FKBD procedures resulted in reduced use of contrast media and shorter procedure and fluoroscopy times. Long-term data on stent thrombosis are needed. Clinical Trial Registration- URL: http...

  20. Analysis of the Risk Factors of Surgery after Endoscopic Balloon Dilation for Small Intestinal Strictures in Crohn's Disease Using Double-balloon Endoscopy.

    Science.gov (United States)

    Nishida, Yu; Hosomi, Shuhei; Yamagami, Hirokazu; Yukawa, Tomomi; Nagami, Yasuaki; Tanaka, Fumio; Kamata, Noriko; Tanigawa, Tetsuya; Shiba, Masatsugu; Watanabe, Toshio; Tominaga, Kazunari; Fujiwara, Yasuhiro; Arakawa, Tetsuo

    2017-09-01

    Objective Balloon-assisted endoscopy enables access to and treatment of strictures in the small intestine using endoscopic balloon dilation (EBD); however, the long-term outcomes of EBD have not been sufficiently evaluated. This study evaluated the long-term outcomes of EBD in Crohn's disease to identify the risk factors associated with the need for subsequent surgical intervention. Methods We retrospectively analyzed patients with Crohn's disease who had undergone EBD with double-balloon endoscopy (DBE) for small intestinal strictures at a single center between 2006 and 2015. The long-term outcomes were assessed based on the cumulative surgery-free rate following initial EBD. Results Seventy-two EBD with DBE sessions and 112 procedures were performed for 37 patients during this period. Eighteen patients (48.6%) required surgery during follow-up. Significant factors associated with the need for surgery in a multivariate analysis were multiple strictures (adjusted hazard ratio, 14.94; 95% confidence interval, 1.91-117.12; p=0.010). One patient (6.7%) required surgery among 15 who had single strictures compared to 17 (77.3%) among 22 patients with multiple strictures. Conclusion In a multivariate analysis, the presence of multiple strictures was a significant risk factor associated with the need for surgery; therefore, a single stricture might be a good indication for EBD using DBE for small intestinal strictures in Crohn's disease patients.

  1. Nephrostomy in percutaneous nephrolithotomy (PCNL)

    DEFF Research Database (Denmark)

    Cormio, Luigi; Preminger, Glenn; Saussine, Christian

    2013-01-01

    PURPOSE: To explore the relationships between nephrostomy tube (NT) size and outcome of percutaneous nephrolithotomy (PCNL). METHODS: The Clinical Research Office of the Endourological Society (CROES) prospectively collected data from consecutive patients treated with PCNL over a 1-year period at......; nephrostomy size > 18 Fr) NT. RESULTS: Patients who received a LB NT had a significantly lower rate of hemoglobin reduction (3.0 vs. 4.3 g/dL; P ...

  2. Clinical study of columnar balloon dilatation therapy for severe dysphagia caused by upper esophageal sphincter achalasia after stroke

    Directory of Open Access Journals (Sweden)

    Wei-bo SHAO

    2017-03-01

    Full Text Available Objective To investigate the mechanism and effect of columnar balloon dilatation therapy on treating patients with severe dysphagia caused by upper esophageal sphincter (UES achalasia after stroke. Methods Sixty -four patients with severe dysphagia caused by UES achalasia after stroke were diagnosed through Video Fluoroscopic Swallowing Study (VFSS and esophageal dynamics testing. The patients were randomly divided into control group (N = 32 and treatment group (N = 32. Patients in control group were treated with routine drug treatment and routine rehabilitation training, while patients in treatment group were treated with columnar balloon dilatation therapy on the basis of routine treatment. The treatment end point was either the patient resuming an oral diet or after 4-weeks treatment. All cases were evaluated by swallowing function of VFSS, high resolution manometry (HRM and scores of the severity of dysphagia before treatment and at treatment end point. Results Compared with before treatment, UES resting pressure (P = 0.000 and residual pressure (P = 0.000 were significantly decreased, peak pressure was significantly increased (P = 0.000, duration of relaxation was prolonged (P = 0.000, and scores of the severity of dysphagia were significantly increased (P = 0.000, 0.000 in both groups after treatment. Compared with control group, UES resting pressure (P = 0.001 and residual pressure (P = 0.000 were significantly decreased, peak pressure was significantly increased (P = 0.002, duration of relaxation was prolonged (P = 0.000, and scores of the severity of dysphagia were significantly increased (P = 0.000 in treatment group after treatment. Until the treatment end point or after 4-week treatment, the total effective rate in treatment group was significantly higher than that in control group [93.75% (30/32 vs. 81.25% (26/32; χ2 = 4.010, P = 0.000]. Conclusions Columnar balloon dilatation therapy is effective for reducing the tension of upper

  3. Balloon dilation of the eustachian tube in a cadaver model: technical considerations, learning curve, and potential barriers.

    Science.gov (United States)

    McCoul, Edward D; Singh, Ameet; Anand, Vijay K; Tabaee, Abtin

    2012-04-01

    The surgical management options for eustachian tube dysfunction have historically been limited. The goal of the current study was to evaluate the technical considerations, learning curve, and potential barriers for balloon dilation of the eustachian tube (BDET) as an alternative treatment modality. Prospective preclinical trial of BDET in a cadaver model. A novel balloon catheter device was used for eustachian tube dilation. Twenty-four BDET procedures were performed by three independent rhinologists with no prior experience with the procedure (eight procedures per surgeon). The duration and number of attempts of the individual steps and overall procedure were recorded. Endoscopic examination of the eustachian tube was performed after each procedure, and the surgeon was asked to rate the subjective difficulty on a five-point scale. Successful completion of the procedure occurred in each case. The overall mean duration of the procedure was 284 seconds, and a mean number of 1.15 attempts were necessary to perform the individual steps. The mean subjective procedure difficulty was noted as somewhat easy. Statistically shorter duration and subjectively easier procedure were noted in the second compared to the first half of the series, indicating a favorable learning curve. Linear fissuring within the eustachian tube lumen without submucosal disruption (nine procedures, 37%) and with submucosal disruption (five procedures, 21%) were noted. The significance of these physical findings is unclear. Preclinical testing of BDET is associated with favorable duration, learning curve, and overall ease of completion. Clinical trials are necessary to evaluate safety and efficacy. Copyright © 2012 The American Laryngological, Rhinological, and Otological Society, Inc.

  4. Cross-sectional Analysis of the Relationship between Paranasal Sinus Balloon Catheter Dilations and Industry Payments among Otolaryngologists.

    Science.gov (United States)

    Fujiwara, Rance J T; Shih, Allen F; Mehra, Saral

    2017-11-01

    Objective To characterize the relationship between industry payments and use of paranasal sinus balloon catheter dilations (BCDs) for chronic rhinosinusitis. Study Design Cross-sectional analysis of Medicare B Public Use Files and Open Payments data. Setting Two national databases, 2013 to 2014. Subjects and Methods Physicians with Medicare claims with Current Procedural Terminology codes 31295 to 31297 were identified and cross-referenced with industry payments. Multivariate linear regression controlling for age, race, sex, and comorbidity in a physician's Medicare population was performed to identify associations between use of BCDs and industry payments. The final analysis included 334 physicians performing 31,506 procedures, each of whom performed at least 11 balloon dilation procedures. Results Of 334 physicians, 280 (83.8%) received 4392 industry payments in total. Wide variation in payments to physicians was noted (range, $43.29-$111,685.10). The median payment for food and beverage was $19.26 and that for speaker or consulting fees was $409.45. One payment was associated with an additional 3.05 BCDs (confidence interval [95% CI],1.65-4.45; P < .001). One payment for food and beverages was associated with 3.81 additional BCDs (95% CI, 2.13-5.49; P < .001), and 1 payment for speaker or consulting fees was associated with 5.49 additional BCDs (95% CI, 0.32-10.63; P = .04). Conclusion Payments by manufacturers of BCD devices were associated with increased use of BCD for chronic rhinosinusitis. On separate analyses, the number of payments for food and beverages as well as that for speaker and consulting fees was associated with increased BCD use. This study was cross-sectional and cannot prove causality, and several factors likely exist for the uptrend in BCD use.

  5. Effects of structural injure in the bile bacterial contamination after balloon transduodenal sphincteroplasty (papillary dilation in dogs

    Directory of Open Access Journals (Sweden)

    Zavadinack Netto Martin

    2006-01-01

    Full Text Available PURPOSE: To evaluate, in dogs, the biliary sphincter subjected to dilation by hydrostatic balloon by the point of view of structural alterations of the papilla and the biochemestry and bacterial contamination of the bile. METHODS: Twenty dogs were submitted to laparotomy, duodenotomy, and enlargement of the major duodenal papilla- GA(n=10 - with balloon of 8mm inflated with pressure of 0,5atm, during 2 minutes or to the sham procedure - GB(n=10. Blood samples collected on times t(0day, t(7days and t(28days were subjected to dosages of alkaline phosphatase (ALP and gamma-glutamyltransferase (GGT for cholestasis evaluation. The collected material from the gall bladder at the same times were registered and numbered to be submitted to culture in BHI, blood agar (rich, non-selective element and Mac Conkey (selective element for Gram-negative bacillus. On the 28th day three fragments of the papilla were tranversally cut by the choledoc axis 3mm from the duodenal papilla and the cuts, stained with hematoxylin-eosin and Masson's tricome, were evaluated according to their inflammatory reaction. RESULTS: The GGT and ALP averages on the three periods in the groups A and B did not show significant differences, not being characterizes the cholestasis. The bacterian contamination was significantly higher in GA (2,19 than in GB (1,96; the contamination was lower in the initial time compared with 7 and 28 days (t0dilation or its simple manipulation leads to the bacterial contamination of the gall bladder, not associated with cholestasis. The morphologic lesions are more intense in the late phase, not associated with an eventual papilla esthenosis.

  6. Effects of structural injure in the bile bacterial contamination after balloon transduodenal sphincteroplasty (papillary dilation) in dogs.

    Science.gov (United States)

    Zavadinack Netto, Martin; Fagundes, Djalma José; Bandeira, César Orlando Peralta

    2006-01-01

    To evaluate, in dogs, the biliary sphincter subjected to dilation by hydrostatic balloon by the point of view of structural alterations of the papilla and the biochemestry and bacterial contamination of the bile. Twenty dogs were submitted to laparotomy, duodenotomy, and enlargement of the major duodenal papilla- GA(n=10) - with balloon of 8mm inflated with pressure of 0,5 atm, during 2 minutes or to the sham procedure - GB(n=10). Blood samples collected on times t(0 day), t(7 days) and t(28 days) were subjected to dosages of alkaline phosphatase (ALP) and gamma-glutamyltransferase (GGT) for cholestasis evaluation. The collected material from the gall bladder at the same times were registered and numbered to be submitted to culture in BHI, blood agar (rich, non-selective element) and Mac Conkey (selective element for Gram-negative bacillus. On the 28th day three fragments of the papilla were tranversally cut by the choledoc axis 3mm from the duodenal papilla and the cuts, stained with hematoxylin-eosin and Masson's tricome, were evaluated according to their inflammatory reaction. The GGT and ALP averages on the three periods in the groups A and B did not show significant differences, not being characterizes the cholestasis. The bacterian contamination was significantly higher in GA (2,19) than in GB (1,96); the contamination was lower in the initial time compared with 7 and 28 days (t0dilation or its simple manipulation leads to the bacterial contamination of the gall bladder, not associated with cholestasis. The morphologic lesions are more intense in the late phase, not associated with an eventual papilla esthenosis.

  7. Use of cone-beam CT and live 3-D needle guidance to facilitate percutaneous nephrostomy and nephrolithotripsy access in children and adolescents

    Energy Technology Data Exchange (ETDEWEB)

    Hawkins, C.M. [Emory University School of Medicine, Department of Radiology and Imaging Sciences, Atlanta, GA (United States); Kukreja, Kamlesh [Texas Children' s Hospital, Department of Radiology, Houston, TX (United States); Singewald, Timothy; Johnson, Neil D.; Racadio, John M. [Cincinnati Children' s Hospital Medical Center, Department of Radiology, Cincinnati, OH (United States); Minevich, Eugene; Reddy, Pramod [Cincinnati Children' s Hospital Medical Center, Department of Urology, Cincinnati, OH (United States)

    2016-04-15

    Gaining access into non-dilated renal collecting systems for percutaneous nephrolithotripsy, particularly in patients with prohibitive body habitus and/or scoliosis, is often challenging using conventional techniques. To evaluate the feasibility of cone-beam CT for percutaneous nephrostomy placement for subsequent percutaneous nephrolithotripsy in children and adolescents. A retrospective review of percutaneous nephrostomy revealed use of cone-beam CT and 3-D guidance in 12 percutaneous nephrostomy procedures for 9 patients between 2006 and 2015. All cone-beam CT-guided percutaneous nephrostomies were for pre-lithotripsy access and all 12 were placed in non-dilated collecting systems. Technical success was 100%. There were no complications. Cone-beam CT with 3-D guidance is a technically feasible technique for percutaneous nephrostomy in children and adolescents, specifically for nephrolithotripsy access in non-dilated collecting systems. (orig.)

  8. Use of cone-beam CT and live 3-D needle guidance to facilitate percutaneous nephrostomy and nephrolithotripsy access in children and adolescents.

    Science.gov (United States)

    Hawkins, C Matthew; Kukreja, Kamlesh; Singewald, Timothy; Minevich, Eugene; Johnson, Neil D; Reddy, Pramod; Racadio, John M

    2016-04-01

    Gaining access into non-dilated renal collecting systems for percutaneous nephrolithotripsy, particularly in patients with prohibitive body habitus and/or scoliosis, is often challenging using conventional techniques. To evaluate the feasibility of cone-beam CT for percutaneous nephrostomy placement for subsequent percutaneous nephrolithotripsy in children and adolescents. A retrospective review of percutaneous nephrostomy revealed use of cone-beam CT and 3-D guidance in 12 percutaneous nephrostomy procedures for 9 patients between 2006 and 2015. All cone-beam CT-guided percutaneous nephrostomies were for pre-lithotripsy access and all 12 were placed in non-dilated collecting systems. Technical success was 100%. There were no complications. Cone-beam CT with 3-D guidance is a technically feasible technique for percutaneous nephrostomy in children and adolescents, specifically for nephrolithotripsy access in non-dilated collecting systems.

  9. Antegrade deligation of iatrogenic distal ureteric obstruction utilising a high pressure balloon dilatation technique.

    LENUS (Irish Health Repository)

    Rajendran, Simon

    2012-02-01

    BACKGROUND: Iatrogenic trauma is the leading cause of ureteric injury with an incidence in abdominal and pelvic surgery varying between 0.4 and 2.5%. CASE: We report a case of ureteric obstruction caused by a haemostatic clip. There was associated rupture of the ureter proximal to the clip with intra-peritoneal leakage of urine. The patient was unfit for surgery and was managed by a novel procedure of endoluminal balloon deligation. CONCLUSION: Ureteric injuries are rare but potentially serious complications. They require prompt diagnosis and management depends on the patients\\' clinical condition, extent of injury and interval from injury to diagnosis. We have successfully demonstrated a new technique to treat ureteric obstruction caused by a haemostatic clip with associated ureteral rupture in a patient unfit for surgery.

  10. Transcatheter balloon dilation for recurrent right ventricular outflow tract obstruction following valve-sparing repair of tetralogy of Fallot.

    Science.gov (United States)

    Gellis, Laura; Banka, Puja; Marshall, Audrey; Emani, Sitaram; Porras, Diego

    2015-10-01

    Valve-sparing repair in patients with tetralogy of Fallot (TOF) carries the risk of residual or recurrent right ventricular outflow tract (RVOT) obstruction, which is often treated with transcatheter balloon dilation (BD). The outcomes and associated complications of BD of the RVOT in this scenario remain unknown. Retrospective review of the records of the Department of Cardiology at Boston Children's Hospital from 2000 to 2013 was performed. 34 patients had initial valve-sparing repair of tetralogy of Fallot followed by BD of the RVOT during the study period. Following BD, the RVOT gradient decreased from a median of 43 mm Hg (range 13 to 79 mm Hg) to 28 mm Hg (range 0 to 73 mm Hg) (P 1 and a final RVOT gradient of ≥40 post-BD were associated with shorter freedom from reintervention (P < 0.001). BD in patients with recurrent RVOT obstruction following valve-sparing repair of TOF acutely reduces the RVOT gradient, but commonly results in increased PR and is associated with a high reintervention rate. Patients with stenosis solely at the level of the valve had a better response to this type of intervention. © 2015 Wiley Periodicals, Inc.

  11. Effects Comparison between Endoscopic Papillary Large Balloon Dilatation and Endoscopic Sphincterotomy for Common Bile Duct Stone Removal

    Directory of Open Access Journals (Sweden)

    Yandong Guo

    2015-01-01

    Full Text Available Endoscopic sphincterotomy (EST is a treatment of choice for stone extraction and is now most frequently used. The study was to compare the efficacy of endoscopic papillary large balloon dilatation (EPLBD and endoscopic sphincterotomy (EST for common bile duct stone removal. Trials comparing the effects between EPLBD and EST treatment were searched according to the study protocol. Overall stone removal rate, complete removal rate in 1st session, treatment duration, mechanical lithotripsy using rate, and overall complication rate were compared using risk ratio (RR and mean difference (MD and their 95% confidence interval (CI via RevMan 5.2 software. For overall stone removal rate, two therapies showed similar effect, but EPLBD showed better overall stone removal rate for stone >10 mm in diameter. For complete stone removal rate in 1st session, no difference was found, even for those with stone >10 mm in diameter; EPLBD showed longer treatment duration, higher mechanical lithotripsy using rate obvious overall complications rate, and more serious bleeding, whereas there were no significant differences for perforation, hyperamylasemia, pancreatitis, and cholecystitis/cholangitis. EPLBD showed better efficacy in certain conditions compared to EST, however with shortcomings, such as more duration, higher mechanical lithotripsy using rate, more serious overall complications rate, and bleeding.

  12. Influence of Contrast Agent Dilution on Ballon Deflation Time and Visibility During Tracheal Balloon Dilation: A 3D Printed Phantom Study

    International Nuclear Information System (INIS)

    Kim, Min Tae; Park, Jung-Hoon; Shin, Ji Hoon; Kim, Namkug; Kim, Sunghyun Daniel; Tsauo, Jiaywei; Kim, Kun Young; Kim, Guk Bae; Song, Ho-Young

    2017-01-01

    PurposeTo determine the effect of contrast medium dilution during tracheal balloon dilation on balloon deflation time and visibility using a 3-dimensional (3D) printed airway phantom.Materials and MethodsA comparison study to investigate balloon deflation times and image quality was performed using two contrast agents with different viscosities, i.e., iohexol and ioxithalamate, and six contrast dilutions with a 3D printed airway phantom.ResultsCompared to 1:0 concentration, 3:1, 2:1, 1:1, 1:2, and 1:3, contrast/saline ratios resulted in a 46% (56.2 s), 59.8% (73.1 s), 74.9% (91.6 s), 81.7% (99.8 s), and 83.5% (102 s) reduction for iohexol, respectively, and a 51.8% (54.7 s), 63.8% (67.6 s), 74.7% (79.2 s), 80.5% (85.3 s), and 82.4% (87.4 s) reduction for ioxithalamate, respectively, in the mean balloon deflation time, although at the expense of decreased balloon opacity (3.5, 6.9, 11.1, 12.4, and 13.9%, for iohexol, respectively, and 3.2, 6, 9.6, 10.8, and 12.4%, for ioxithalamate, respectively).ConclusionsUse of a lower viscosity contrast agent and higher contrast dilution is considered to be able to reduce balloon deflation times and then simultaneously decrease visualization of balloons. The rapid balloon deflation time is likely to improve the safe performance of interventional procedures.

  13. Influence of Contrast Agent Dilution on Ballon Deflation Time and Visibility During Tracheal Balloon Dilation: A 3D Printed Phantom Study.

    Science.gov (United States)

    Kim, Min Tae; Park, Jung-Hoon; Shin, Ji Hoon; Kim, Namkug; Kim, Sunghyun Daniel; Tsauo, Jiaywei; Kim, Kun Young; Kim, Guk Bae; Song, Ho-Young

    2017-02-01

    To determine the effect of contrast medium dilution during tracheal balloon dilation on balloon deflation time and visibility using a 3-dimensional (3D) printed airway phantom. A comparison study to investigate balloon deflation times and image quality was performed using two contrast agents with different viscosities, i.e., iohexol and ioxithalamate, and six contrast dilutions with a 3D printed airway phantom. Compared to 1:0 concentration, 3:1, 2:1, 1:1, 1:2, and 1:3, contrast/saline ratios resulted in a 46% (56.2 s), 59.8% (73.1 s), 74.9% (91.6 s), 81.7% (99.8 s), and 83.5% (102 s) reduction for iohexol, respectively, and a 51.8% (54.7 s), 63.8% (67.6 s), 74.7% (79.2 s), 80.5% (85.3 s), and 82.4% (87.4 s) reduction for ioxithalamate, respectively, in the mean balloon deflation time, although at the expense of decreased balloon opacity (3.5, 6.9, 11.1, 12.4, and 13.9%, for iohexol, respectively, and 3.2, 6, 9.6, 10.8, and 12.4%, for ioxithalamate, respectively). Use of a lower viscosity contrast agent and higher contrast dilution is considered to be able to reduce balloon deflation times and then simultaneously decrease visualization of balloons. The rapid balloon deflation time is likely to improve the safe performance of interventional procedures.

  14. Influence of Contrast Agent Dilution on Ballon Deflation Time and Visibility During Tracheal Balloon Dilation: A 3D Printed Phantom Study

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Min Tae; Park, Jung-Hoon; Shin, Ji Hoon, E-mail: jhshin@amc.seoul.kr; Kim, Namkug, E-mail: namkugkim@gmail.com [University of Ulsan College of Medicine, Departments of Radiology and Research Institute of Radiology, Asan Medical Center (Korea, Republic of); Kim, Sunghyun Daniel [Seoul National University College of Medicine (Korea, Republic of); Tsauo, Jiaywei; Kim, Kun Young [University of Ulsan College of Medicine, Departments of Radiology and Research Institute of Radiology, Asan Medical Center (Korea, Republic of); Kim, Guk Bae [University of Ulsan College of Medicine, Biomedical Engineering Research Center, Asan Medical Center (Korea, Republic of); Song, Ho-Young [University of Ulsan College of Medicine, Departments of Radiology and Research Institute of Radiology, Asan Medical Center (Korea, Republic of)

    2017-02-15

    PurposeTo determine the effect of contrast medium dilution during tracheal balloon dilation on balloon deflation time and visibility using a 3-dimensional (3D) printed airway phantom.Materials and MethodsA comparison study to investigate balloon deflation times and image quality was performed using two contrast agents with different viscosities, i.e., iohexol and ioxithalamate, and six contrast dilutions with a 3D printed airway phantom.ResultsCompared to 1:0 concentration, 3:1, 2:1, 1:1, 1:2, and 1:3, contrast/saline ratios resulted in a 46% (56.2 s), 59.8% (73.1 s), 74.9% (91.6 s), 81.7% (99.8 s), and 83.5% (102 s) reduction for iohexol, respectively, and a 51.8% (54.7 s), 63.8% (67.6 s), 74.7% (79.2 s), 80.5% (85.3 s), and 82.4% (87.4 s) reduction for ioxithalamate, respectively, in the mean balloon deflation time, although at the expense of decreased balloon opacity (3.5, 6.9, 11.1, 12.4, and 13.9%, for iohexol, respectively, and 3.2, 6, 9.6, 10.8, and 12.4%, for ioxithalamate, respectively).ConclusionsUse of a lower viscosity contrast agent and higher contrast dilution is considered to be able to reduce balloon deflation times and then simultaneously decrease visualization of balloons. The rapid balloon deflation time is likely to improve the safe performance of interventional procedures.

  15. Endoscopic Papillary Large Balloon Dilation Versus Endoscopic Sphincterotomy for Retrieval of Large Choledocholithiasis: A Prospective Randomized Trial.

    Science.gov (United States)

    Omar, Mohammed A; Abdelshafy, Mohamed; Ahmed, Mohamed Yousef; Rezk, Asmaa Gaber; Taha, Abdallah M; Hussein, Hamdy M

    2017-07-01

    Endoscopic sphincterotomy (ES) is the standard technique for common bile duct (CBD) stone removal. Recently, endoscopic papillary large balloon dilation (EPLBD) has been shown to be a safe and effective technique for the removal of large CBD stone. The aim of this study was to determine the therapeutic outcomes and safety of EPLBD compared with ES for large CBD stone extraction. One hundred twenty-four patients with large bile duct stones were randomized into two groups, the first group included 61 patients subjected to EPLBD and the second group included 63 patients who underwent ES. We compared the success rate of stone removal, frequency of mechanical lithotripsy requirement, morbidity, and mortality. Baseline characteristics were not significantly different. The overall ductal clearance rate was ultimately similar between the EPLBD group (96.7%) and the ES group (93.7%) (P = .53), the one session ductal clearance rate was significantly different (86.9% versus 71.4%; P = .01). Requirement of mechanical lithotripsy was significantly different between the EPLBD and ES group (9.8% versus 17.5%, P = .04). There were no differences in complication rates between the EPLBD and ES group; pancreatitis, 4.9% versus 6.3%; minor hemorrhage, 1.6% versus 6.3%; acute cholangitis, 3.3% versus 1.9%; and recurrent stones, 3.3% versus 3.2%. The therapeutic outcomes of EPLBD for removal of large bile duct stones are better than those of ES with comparable complication rate. EPLBD is also recommended for removal of large CBD stone in patients with an underlying coagulopathy or need for anticoagulation following endoscopic retrograde cholangiopancreaticography.

  16. Large-diameter (30-35 mm) pneumatic balloon dilatation of the pylorus in patients with gastric outlet obstruction symptoms after esophagectomy.

    Science.gov (United States)

    Ericson, J; Sunde, B; Lindblad, M; Nilsson, M; Lundell, L; Tsai, J A

    2013-01-01

    Functional gastric outlet obstruction is a common problem after esophagectomy. The aim of this study was to evaluate the safety and efficacy of treating this group of patients with pneumatic dilatation of the pyloric sphincter region using a large-diameter (30-35 mm) balloon. A review of all patients who had undergone pneumatic dilatation of the pylorus sphincter because of gastric outlet obstruction symptoms after esophagectomy at the Karolinska University Hospital from 2006-2011 was completed. Main outcomes were recordings of nausea, regurgitation and bloating. A total of 13 patients received pneumatic dilatation after an esophagectomy. The median time between esophagectomy and the first dilatation was 100 days, and the patients underwent a total of 21 dilatations (1-3 per patient) to a final median diameter of 30 mm. No procedure-related complications occurred. The median follow-up time was 205 days, and nausea and regurgitation improved significantly (p gastric outlet obstruction after esophagectomy. To document its true effectiveness, a randomized and sham-controlled study is needed.

  17. Impact of chronic rhinosinusitis on work productivity through one-year follow-up after balloon dilation of the ethmoid infundibulum.

    Science.gov (United States)

    Stankiewicz, James; Tami, Thomas; Truitt, Theodore; Atkins, James; Winegar, Bradford; Cink, Paul; Schaeffer, B Todd; Raviv, Joseph; Henderson, Diana; Duncavage, James; Hagaman, David

    2011-01-01

    Although multiple clinical trials have demonstrated that balloon dilation of sinus ostia in patients diagnosed with chronic rhinosinusitis (CRS) results in sustained symptomatic improvement, less data are available to measure the effects of sinusitis on worker productivity. The objective of our research was to analyze work and activity impairment before and after transantral, endoscopically-guided balloon dilation of the maxillary sinus ostia and ethmoid infundibulum. Subjects diagnosed with CRS and computed tomography (CT) evidence of disease in the maxillary sinuses alone, or maxillary and anterior ethmoid sinuses, completed the Work Productivity and Activity Impairment (WPAI) questionnaire and the Work Limitation Questionnaire (WLQ) before treatment and at 3, 6, and 12 months postprocedure. A total of 56 subjects were enrolled and 53 completed the 1-year follow-up. The lost productivity composite score computed from the WLQ improved by 73% (9.0 to 2.4; p productivity at work as measured by the WPAI improved by approximately 76% (38.3 to 9.2; p problems impose a substantial burden on work productivity and physical/mental activity levels. Treatment of CRS by dilating the maxillary sinus ostium and ethmoid infundibulum can significantly improve quality of life (QOL) and work productivity. Copyright © 2011 American Rhinologic Society-American Academy of Otolaryngic Allergy, LLC.

  18. Outcomes of Percutaneous Management of Anastomotic Ureteral Strictures in Renal Transplantation: Chronic Nephroureteral Stent Placement with and without Balloon Dilatation

    Energy Technology Data Exchange (ETDEWEB)

    Uflacker, A., E-mail: andreuflacker@gmail.com; Sheeran, D., E-mail: dsheeran9@gmail.com; Khaja, M., E-mail: mkhaja@mac.com [University of Virginia/Interventional Radiology (United States); Patrie, J., E-mail: jp4h@virginia.edu [UVA Health System/Radiology (United States); Elias, G., E-mail: gae2y@virginia.edu [VCU Medical Center/Radiology (United States); Saad, W., E-mail: wspikes@yahoo.com [University of Michigan Health System (United States)

    2015-06-15

    PurposeThis study was designed o evaluate outcomes of percutaneous management of anastomotic ureteral strictures in renal transplants using nephroureteral stents with or without balloon dilatation.MethodsA retrospective audit of 1,029 consecutive renal transplants was performed. Anastomotic ureteral strictures were divided into two groups: nephroureteral stent only (NUS) and NUS+PTA (nephroureteral stent plus percutaneous transluminal angioplasty), with each cohort subdivided into early versus late presentation (obstructive uropathy occurring <90 day or >90 days from transplant, respectively). Overall and 6-month technical success were defined as removal of NUS any time with <30 % residual stenosis (any time lapse less or more than 6 months) and at >6 months, respectively. Patency was evaluated from NUS removal to last follow-up for both groups and compared.ResultsSixty-seven transplant patients with 70 ureteric anastomotic strictures (6.8 %, n = 70/1,029) underwent 72 percutaneous treatments. 34 % were late (>90 days, n = 24/70), and 66 % were early (<90 days, n = 46/70). Overall technical success was 82 % (n = 59/72) and 6-month success was 58 % (n = 42/72). Major and minor complications were 2.8 % (n = 2/72), and 12.5 % (n = 9/72). NUS+PTA did not improve graft survival (p = 0.354) or patency (p = 0.9) compared with NUS alone. There was no difference in graft survival between treated and nontreated groups (p = 0.74).ConclusionsThere is no advantage to PTA in addition to placement of NUS, although PTA did not negatively impact graft survival or long-term patency and both interventions were safe and effective. Neither the late or early groups benefited from PTA in addition to NUS. Earlier obstructions showed greater improvement in serum creatinine than later obstructions.

  19. Sinuplasty (Balloon Catheter Dilation)

    Science.gov (United States)

    ... Anatomy Virtual Anatomy Disclosure Statement CONDITIONS Adult Sinusitis Pediatric Sinusitis Fungal Sinusitis Sinusitis & Asthma Empty Nose Syndrome Cystic Fibrosis Sinusitis Q&A Complications of Sinusitis Epistaxis (Nosebleeds) Allergic Rhinitis (Hay Fever) Headaches and Sinus Disease Disorders of ...

  20. Underexpansion and Ad Hoc Post-dilation in Selected Patients Undergoing Balloon-Expandable Transcatheter Aortic Valve Replacement

    DEFF Research Database (Denmark)

    Barbanti, Marco; Leipsic, Jonathon; Binder, Ronald

    2014-01-01

    To assess the clinical outcomes and hemodynamic performance associated with a strategy of underexpanding balloon-expandable THVs when excessive oversizing is a concern.......To assess the clinical outcomes and hemodynamic performance associated with a strategy of underexpanding balloon-expandable THVs when excessive oversizing is a concern....

  1. Diuretic Agent and Normal Saline Infusion Technique for Ultrasound-Guided Percutaneous Nephrostomies in Nondilated Pelvicaliceal Systems

    Energy Technology Data Exchange (ETDEWEB)

    Yagci, Cemil, E-mail: cemil.yagci@medicine.ankara.edu.tr; Ustuner, Evren, E-mail: evrenustuner@hotmail.com; Atman, Ebru Dusunceli, E-mail: ebrumd2001@yahoo.com [Ankara University, Department of Radiology, School of Medicine (Turkey); Baltaci, Sumer, E-mail: sbaltaci@hotmail.com [Ankara University, Department of Urology, School of Medicine (Turkey); Uzun, Caglar, E-mail: cuzun77@yahoo.com; Akyar, Serdar, E-mail: yusuf.s.akyar@medicine.ankara.edu.tr [Ankara University, Department of Radiology, School of Medicine (Turkey)

    2013-04-15

    Percutaneous nephrostomy (PCN) in a nondilated pelvicaliceal system is technically challenging. We describe an effective method to achieve transient dilatation of the pelvicaliceal system via induction of diuresis using infusion of a diuretic agent in normal saline, therefore allowing easier access to the pelvicaliceal system. Under real-time ultrasound guidance, the technique had been tested in 22 nephrostomies with nondilated system (a total of 20 patients with 2 patients having bilateral nephrostomies) during a 5-year period. Patients were given 40 mg of furosemide in 250 ml of normal saline solution intravenously by rapid infusion. As soon as maximum calyceal dilatation of more than 5 mm was observed, which is usually 15 min later after the end of rapid infusion, patients were positioned obliquely, and PCN procedure under ultrasound guidance was performed. The procedure was successful in 19 of the nephrostomies in 17 patients with a success rate of 86.36 % per procedure and 85 % per patient in nondilated pelvicaliceal systems. No major nephrostomy-, drug-, or technique-related complications were encountered. The technique failed to work in three patients due to the presence of double J catheters and preexisting calyceal perforation which avoided transient dilation of the pelvicaliceal system with diuresis. Diuretic infusion in saline is a feasible and effective method for PCN in nondilated pelvicaliceal systems.

  2. Postoperative vesicoureteral reflux after high-pressure balloon dilation of the ureterovesical junction in primary obstructive megaureter. Incidence, management and predisposing factors.

    Science.gov (United States)

    García-Aparicio, Luis; Blázquez-Gómez, Eva; de Haro, Irene; Garcia-Smith, Natalie; Bejarano, Miguel; Martin, Oriol; Rodo, Joan

    2015-12-01

    To describe the incidence, predisposing factors and management of postoperative vesicoureteral reflux (VUR) after high-pressure balloon dilation to treat primary obstructive megaureter (POM). We have reviewed patients that underwent endoscopic treatment for POM from May 2008 to November 2013. All patients were evaluated with renal ultrasound, voiding cystourethrography and diuretic renogram. Endoscopic treatment was done with high-pressure balloon dilation of the ureterovesical junction under general anesthesia; a double-J stenting was done in all patients. Follow-up was performed with ultrasonography, voiding cystourethrography and a diuretic renogram in all patients. Fifteen boys and five girls with a mean age of 14.18 months (3-103) were reviewed. A total of 22 ureters underwent HPBD to treat POM. Ureterohydronephrosis improves in 19 ureters. After endoscopic treatment, six ureters developed VUR. Four ureters were managed surgically, and in the other two, VUR disappeared in a second cystogram. The presence of parameatal diverticulum in the preoperative cystography and those patients with bilateral POM are factors related to postoperative VUR (p < 0.05). Urinary tract infection after HPBD was observed in four patients, but only one of them was affected with VUR.

  3. Efficacy and safety of endoscopic papillary balloon dilation for the removal of bile duct stones: Data from a “real-life” multicenter study on Dilation-Assisted Stone Extraction

    Science.gov (United States)

    Di Mitri, Roberto; Mocciaro, Filippo; Pallio, Socrate; Pecoraro, Giulia Maria; Tortora, Andrea; Zulli, Claudio; Attardo, Simona; Maurano, Attilio

    2016-01-01

    AIM To report data on Dilation-Assisted Stone Extraction (DASE) use in clinical practice and its efficacy and safety trough three Italian referral centers for biliopancreatic diseases treatment. METHODS From January 2011 to December 2015 we collected data on 120 patients treated with DASE. Technical success was obtained when the endoscopist was able to place the balloon trough the papilla inflating the balloon until the final diameter for an adequate time (at least 30 s). Clinical success was obtained after complete stone removal (no remaining stones were visible at the cholangiogram). RESULTS Forty-nine male (40.8%) and 71 female (59%) were enrolled. The mean age was 67.8 years ± 15.7. The mean common bile duct (CBD) dilation was 19.2 mm ± 3.9 and the mean size of stones 15.8 ± 2.9. DASE was applied as first approach in 38% (62% after initial failure of stones extraction). Technical and clinical success was of 91% and 87% respectively. In those in which DASE failed alternative treatment were adopted. After DASE 18% of patients experienced a complication (bleeding 9%, pancreatitis 8%, perforation 0.8%). At univariable analysis, elective endoscopic retrograde cholangiopancreatography (P = 0.031), DASE as first approach (P = 0.032), and cannulation of major papilla followed by guidewire insertion (P = 0.004) were related to low risk of complications. Pre-cut was related to an increased risk of complications (P = 0.01). CONCLUSION DASE allowed a higher first-session success rate and can be consider a valid alternative to endoscopic sphincterotomy not only for bigger CBD stones. PMID:27803771

  4. Sequential Venous Percutaneous Transluminal Angioplasty and Balloon Dilatation of the Interatrial Septum during Percutaneous Edge-to-Edge Mitral Valve Repair

    Directory of Open Access Journals (Sweden)

    Rezo Jorbenadze

    2017-01-01

    Full Text Available Percutaneous edge-to-edge mitral valve repair (PMVR is widely used for selected, high-risk patients with severe mitral valve regurgitation (MR. This report describes a case of 81-year-old woman presenting with severe and highly symptomatic mitral valve regurgitation (MR caused by a flail of the posterior mitral valve leaflet (PML. PMVR turned out to be challenging in this patient because of a stenosis and tortuosity of both iliac veins as well as sclerosis of the interatrial septum, precluding the vascular and left atrial access by standard methods, respectively. We managed to achieve atrial access by venous percutaneous transluminal angioplasty (PTA and balloon dilatation of the interatrial septum. Subsequently, we could advance the MitraClip® system to the left atrium, and deployment of the clip in the central segment of the mitral valve leaflets (A2/P2 resulted in a significant reduction of MR.

  5. Laparoscopic Heller's cardiomyotomy achieved lesser recurrent dysphagia with better quality of life when compared with endoscopic balloon dilatation for treatment of achalasia.

    Science.gov (United States)

    Chan, S M; Chiu, P W Y; Wu, J C Y; Kwan, S M; Kwong, P Y; Lam, K W; Lo, K K; Tee, M K M; Wong, C P; Teoh, A Y B; Wong, S K H; Ng, E K W

    2013-04-01

    Achalasia is a rare primary motility disorder of esophagus; treatments include endoscopic balloon dilatation (EBD) and laparoscopic Heller's cardiomyotomy (LC). This study compared EBD versus LC for treatment of achalasia with focus on quality of life (QoL) and prevalence of post-treatment gastroesophageal reflux disease. This was a retrospective cohort study of all patients diagnosed with achalasia older than 16 treated with either EBD or LC from January 1998 to April 2008. Patients' demographic data, comorbidities, postintervention GERD symptoms, QoL, recurrence of dysphagia, reintervention rate, hospital stay, and time to resumption of diet were collected. Sixty-eight patients were recruited into the study (EBD n= 50; LC n= 18). A significant improvement in QoL was found in patients undergoing LC (0.917 vs. 0.807, P= 0.006). A higher proportion of patients treated with EBD developed post-treatment gastroesophageal reflux symptoms (60.5% vs. 43.8%) when compared with LC, although statistically insignificant (P= 0.34). Patients treated with balloon dilatation had a greater percentage of recurrence of dysphagia (55.1% vs. 26.7%; P= 0.235) and need of reintervention (42.1% vs. 9.1%; P= 0.045). However, these patients had a shorter median hospital stay (1d [range 0-4]) and earlier resumption of diet (0d [range 0-3]). Although EBD is associated with a quicker perioperative recovery, LC accomplished a better QoL, lower incidence of recurrence of dysphagia, and need of reintervention after treatment for achalasia. © 2012 Copyright the Authors. Journal compilation © 2012, Wiley Periodicals, Inc. and the International Society for Diseases of the Esophagus.

  6. Change in cross-sectional area of esophageal muscle does not correlate with the outcome of achalasia after pneumatic balloon dilatation.

    Science.gov (United States)

    Sinn, Dong Hyun; Choi, Yong Sung; Kim, Jeong Hwan; Kim, Eun Ran; Son, Hee Jung; Kim, Jae J; Rhee, Jong Chul; Rhee, Poong-Lyul

    2010-03-01

    Patients with achalasia have a thicker muscularis propria compared to normal patients. Because pneumatic balloon dilatation (PD) is an effective treatment for achalasia, the changes in the esophageal muscles after PD may predict treatment outcomes, if muscular change is of primary importance. In the present study, we aimed to observe the changes in esophageal muscle thickness following PD and assessed whether symptom relapse can be predicted on the basis of the esophageal muscle cross-sectional area (CSA), as measured by high-frequency intraluminal ultrasound (HFIUS). Fifteen patients treated by PD were studied and followed up for a median of 3.6 years. An HFIUS was done before PD and 6 months after PD. The esophageal muscle CSA measured at the lower esophageal sphincter (LES), and 3 and 6 cm above the LES, was used to see whether any association was present between symptom recurrence and the esophageal muscle CSA. A single PD resulted in a 2-year remission rate of 66%. A significance variance in change (-65%-248%) was noticed in the muscle CSA after PD. The predilation muscle CSA, post-dilation muscle CSA, and change in the muscle CSA after PD was not associated with symptom recurrence. Our findings suggest that measuring the muscle CSA does not help to predict treatment outcome. Muscular changes in achalasia might be just reactive changes.

  7. Ultrasound Guided Percutaneous Nephrostomy: Experience at ...

    African Journals Online (AJOL)

    2018-01-30

    Jan 30, 2018 ... Background: Obstructive uropathy is a common problem in urologic practice; temporary relief of obstruction in the upper tract poses a significant challenge. Ultrasound‑guided percutaneous nephrostomy (PCN) is an option for upper tract drainage; compared to fluoroscopic guidance, it is readily available, ...

  8. Ultrasound Guided Percutaneous Nephrostomy: Experience at ...

    African Journals Online (AJOL)

    Background: Obstructive uropathy is a common problem in urologic practice; temporary relief of obstruction in the upper tract poses a significant challenge. Ultrasound‑guided percutaneous nephrostomy (PCN) is an option for upper tract drainage; compared to fluoroscopic guidance, it is readily available, affordable, and not ...

  9. Large Balloon Dilatation Versus Mechanical Lithotripsy After Endoscopic Sphincterotomy in the Management of Large Common Bile Duct Stones in Cirrhotic Patients: A Randomized Study.

    Science.gov (United States)

    Radwan, Mohamed I; Emara, Mohamed H; Ibrahim, Ibrahim M; Moursy, Mahmoud E

    2018-03-07

    Removal of large common bile duct (CBD) stones is one of the challenges faced during endoscopic retrograde cholangiopancreatography, and it seems more difficult in cirrhotic patients because of suspected higher rates of adverse events, especially bleeding diathesis. This study aimed at comparing the success rate and complications between mechanical lithotripsy (ML) and large balloon dilation (LBD) after endoscopic sphincterotomy in patients with liver cirrhosis. Ninety-eight cirrhotic patients with calcular obstructive jaundice were included and randomly divided into 2 groups: group A comprising 49 patients treated by LBD and group B comprising 49 patients treated by ML. All patients underwent sphincterotomy initially. All patients were subjected to thorough history taking and complete clinical examination. Pancreatic enzyme concentrations were measured 4 hours before and 24 hours after the procedure, and complete blood cell count and liver function tests were performed before and the morning after the procedure. Before and during endoscopic retrograde cholangiopancreatography, stone size and number were verified. The success rate for CBD clearance was 98% and 93.8% for LBD and ML, respectively. The rate of adverse events in this study was 10.2% (10/98), and bleeding was the commonest reported complication (5/10). Group B developed more (16.3%) adverse events than group A (4.1%), and the difference was statistically significant (P=0.04). Endoscopic sphincterotomy followed by LBD is a safe and effective treatment for large CBD stones in cirrhotic patients in comparison with sphincterotomy followed by ML.

  10. Impact of kissing balloon inflation on the main vessel stent volume, area, and symmetry after side-branch dilation in patients with coronary bifurcation lesions: a serial volumetric intravascular ultrasound study.

    Science.gov (United States)

    Rahman, Shahid; Leesar, Tara; Cilingiroglu, Mehmet; Effat, Mohamed; Arif, Imran; Helmy, Tarek; Leesar, Massoud A

    2013-09-01

    Intravascular ultrasound (IVUS) was performed to investigate the impact of kissing balloon inflation (KBI) on the main vessel (MV) stent volume, area, and symmetry after side-branch (SB) dilation in patients with coronary bifurcation lesions (CBL). It remains controversial whether KBI would restore the MV stent area and symmetry loss after SB dilation. A total of 88 serial IVUS examinations of the MV were performed after MV angioplasty, MV stenting, SB dilation, and KBI in 22 patients with CBL. The MV stent was divided into proximal, bifurcation, and distal segments; the stent volume index (SVI), minimal stent area (MSA), stent symmetry index (SSI), and external elastic membrane (EEM) volume index were measured in 198 stent segments and compared after MV stenting, SB dilation, and KBI. In the bifurcation segment, SVI, MSA, and SSI were significantly smaller after SB dilation than after MV stenting and KBI (SVI was 6.10 ± 1.50 mm(3)/mm vs. 6.68 ± 1.60 mm(3)/mm and 6.57 ± 1.60 mm(3)/mm, respectively, p impact on the MV stent volume or symmetry. This is the first comprehensive volumetric IVUS analysis of CBL, to our knowledge, demonstrating that KBI restores the MV stent volume, area, and symmetry loss after SB dilation in the bifurcation segment, and induces asymmetric stent expansion in the proximal segment. Copyright © 2013 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.

  11. Quantified degree of eccentricity of aortic valve calcification predicts risk of paravalvular regurgitation and response to balloon post-dilation after self-expandable transcatheter aortic valve replacement.

    Science.gov (United States)

    Park, Jun-Bean; Hwang, In-Chang; Lee, Whal; Han, Jung-Kyu; Kim, Chi-Hoon; Lee, Seung-Pyo; Yang, Han-Mo; Park, Eun-Ah; Kim, Hyung-Kwan; Chiam, Paul T L; Kim, Yong-Jin; Koo, Bon-Kwon; Sohn, Dae-Won; Ahn, Hyuk; Kang, Joon-Won; Park, Seung-Jung; Kim, Hyo-Soo

    2018-05-15

    Limited data exist regarding the impact of aortic valve calcification (AVC) eccentricity on the risk of paravalvular regurgitation (PVR) and response to balloon post-dilation (BPD) after transcatheter aortic valve replacement (TAVR). We investigated the prognostic value of AVC eccentricity in predicting the risk of PVR and response to BPD in patients undergoing TAVR. We analyzed 85 patients with severe aortic stenosis who underwent self-expandable TAVR (43 women; 77.2±7.1years). AVC was quantified as the total amount of calcification (total AVC load) and as the eccentricity of calcium (EoC) using calcium volume scoring with contrast computed tomography angiography (CTA). The EoC was defined as the maximum absolute difference in calcium volume scores between 2 adjacent sectors (bi-partition method) or between sectors based on leaflets (leaflet-based method). Total AVC load and bi-partition EoC, but not leaflet-based EoC, were significant predictors for the occurrence of ≥moderate PVR, and bi-partition EoC had a better predictive value than total AVC load (area under the curve [AUC]=0.863 versus 0.760, p for difference=0.006). In multivariate analysis, bi-partition EoC was an independent predictor for the risk of ≥moderate PVR regardless of perimeter oversizing index. The greater bi-partition EoC was the only significant parameter to predict poor response to BPD (AUC=0.775, p=0.004). Pre-procedural assessment of AVC eccentricity using CTA as "bi-partition EoC" provides useful predictive information on the risk of significant PVR and response to BPD in patients undergoing TAVR with self-expandable valves. Copyright © 2017 Elsevier B.V. All rights reserved.

  12. The efficacy of percutaneous nephrostomy performed by using combined ultrasonography and fluoroscopy: Retrospective analysis of 87 cases

    Directory of Open Access Journals (Sweden)

    Emre Kaçar

    2015-06-01

    Full Text Available Objective: We aimed to evaluate the efficacy of the percutaneous nephrostomy (PN performed by using combined ultrasonography (USG and fluoroscopy. Methods: Eighty-seven patients (48 female, 39 male; mean age, 58.2; range, 19-91 who underwent 106 PN procedures performed by using USG and fluoroscopy combination between July 2011 and May 2015 were retrospectively analyzed. The technical success was considered if nephrostomy catheter was placed within renal pelvis and functioned spontaneously. All patients received preprocedural prophylactic antibiotic and preprocedural coagulation parameters and platelet count were tested in all patients routinely. The procedural complications are classified as major, minor and catheter-related. The technical success rates and complication rates of the PN procedure were calculated. Results: PN was performed for benign causes in 47 patients (54% and for malignant causes in 40 patients (46%. A total of 106 nephrostomies were performed in 101 kidneys (95.1% with dilated systems and in 5 kidneys (4.9% with non-dilated systems. The technical success rate of PN was 98.1% (104/106 PN procedures. Major complication was not observed in any patients. Transient hematuria as a minor complication was seen in 11 patients (12.6%. Catheter dislodgement occurred in 11 patients (12.6%. Conclusion: The PN performed by using combined USG and fluoroscopy is effective and reliable procedure in urinary decompression and diversion with high success and low complication rates. J Clin Exp Invest 2015; 6 (2: 170-174

  13. Subintimal recanalisation and stenting of a common iliac artery occlusion by a left axillary and an ipsilateral femoral retrograde approach using modified gooseneck grab aided by balloon dilatation of 'dissection port'

    Energy Technology Data Exchange (ETDEWEB)

    Thava, V.R. E-mail: raj.thava@ulh.nhs.uk; Stead, R.E.; Smith, R.P

    2004-06-01

    The technique of recanalisation using deliberate subintimal dissection of an occluded iliac artery is being increasingly used and practised via ipsilateral and or contralateral approaches. There remains, however, a fair proportion of cases where, in spite of using gooseneck snares, the wire manipulation to traverse the occlusion can prove unsuccessful resulting in failed de-obliteration of the occlusion. We describe a technique to aid successful re-establishment of the patency using balloon dilatation of the dissection 'entry port' with modified gooseneck snare grab.

  14. Dilatação por cateter-balão (dacrioplastia para tratamento das obstruções congênitas do ducto lacrimonasal Balloon-catheter dilatation (dacrioplasty for congenital nasolacrimal duct obstruction treatment

    Directory of Open Access Journals (Sweden)

    Roberto Murillo Limongi de Souza Carvalho

    2009-10-01

    Full Text Available OBJETIVO: Verificar o resultado da técnica, inédita no Brasil, de dilatação do ducto lacrimonasal usando cateter-balão para tratamento da obstrução congênita do ducto lacrimonasal. MÉTODOS: Foram tratadas crianças com idade entre dois e cinco anos, com obstrução congênita de vias lacrimais usando o cateter-balão (Lacricath® para dilatação das vias lacrimais. O cateter foi introduzido pelo ponto lacrimal superior, sob anestesia geral. RESULTADOS: Entre os 27 olhos tratados, 23 apresentaram desaparecimento dos sinais e sintomas de lacrimejamento (taxa de sucesso de 85,2%. Todos os procedimentos foram realizados sem intercorrências e o seguimento pós-operatório mínimo foi de um ano. CONCLUSÃO: A dilatação com balão mostrou-se segura e eficiente como primeiro procedimento para os casos de obstrução congênita das vias lacrimais em crianças com mais de dois anos.Purpose: To verify the results of balloon-catheter dilatation for the treatment of congenital lacrimal duct obstruction. To the best of author's knowledge this procedure has not been previously used in Brazil and deserves scientific studies. METHODS: Children between 2 and 5 years old, with congenital lacrimal duct obstruction, were treated with balloon-catheter dilatation (Lacricath®. Catheter was introduced by the superior lacrimal punctum, under general anesthesia. RESULTS: Twenty-seven eyes were treated and 23 presented total improvement of epiphora signs and symptoms (85.2% success rate. During a one year follow-up, all the procedures had good outcomes, without complications and all the children had 1 year of follow-up. CONCLUSION: Balloon-catheter dilatation is an efficient and safe procedure and might be used for congenital lacrimal duct obstruction treatment in children older than 2 years.

  15. Dilatación de la papila de Vater con balón de gran diámetro para la extracción de coledocolitiasis Large balloon dilation for removal of bile duct stones

    Directory of Open Access Journals (Sweden)

    J. Espinel

    2008-10-01

    Full Text Available Objetivo: valorar la eficacia y seguridad de la dilatación de la papila de Vater con balones de gran diámetro (BGD para la extracción de coledocolitiasis en pacientes con factores que dificultan o hacen peligrosa la extracción, por las características de los cálculos o de la anatomía peripapilar. Diseño: prospectivo. Pacientes: estudio que incluye 93 pacientes a los que se realizó dilatación hidrostática de la papila con balones de gran diámetro entre junio de 2005 y enero de 2008 por presentar cálculos de gran tamaño, múltiples, colédoco distal afilado, papila peri/intradiverticular, esfinterotomía previa o Billroth-II. Se emplearon dilatadores CRE de diámetros entre 12 y 20 mm. Resultados: se consiguió la extracción de los cálculos en una sesión en todos los pacientes (100%. La mayor parte de las exploraciones (86% no requirieron tiempos prolongados para la extracción. Se precisó litotricia en el 3,2%. Hubo dos complicaciones leves (2,1%. Se detectó hiperamilasemia en el 16% de los pacientes. Conclusiones: la dilatación de la papila de Vater con balón de gran diámetro es una técnica eficaz y segura en la extracción de cálculos difíciles de la vía biliar, sin incrementar el tiempo de la exploración, ni las complicaciones, evitando la necesidad de litotricia en la mayoría de los pacientes.Aim: to assess the efficacy and safety of dilatation of the papilla of Vater with large balloons for the treatment of choledocolithiasis in patients with difficult or risky extraction due to stone characteristics or peripapillary anatomy. Design: prospective. Patients: this study includes 93 patients in whom large-balloon dilation was performed between June 2005 and January 2008. Patients had multiple large stones, tapered distal CBD (common bile duct, peri-/intra-diverticular papilla, and previous sphincterotomy or Billroth-II surgery. A controlled radial expansion (CRE balloon with a diameter range of 12-20 mm was used

  16. Novel use of a balloon dilatation catheter to enable mechanical lithotripsy of difficult common bile duct stones after initial failed attempt: A case report.

    Science.gov (United States)

    Loh, Wei-Liang; Tung, Joshua Yi Min; Tan, Trevor Hwee Yong; Tan, Li Ting; Tan, Shaun; Ngoi, Sing Shang

    2018-01-01

    Difficult and large common bile duct stones can be crushed and removed using a mechanical lithotripter. Very often the lack of working space within the common bile duct causing the failure of mechanical lithotripsy would inevitably mean repeat or further invasive procedures. A patient with large and multiple common bile duct stones underwent ERCP, and initial deployment of a mechanical lithotripter failed due to the lack of working space within the common bile duct. A through-the-scope (TTS) dilator was utilized to increase the working space before successful deployment of the mechanical lithotripter, and subsequent clearance of all stones within the same setting. We herein describe a novel and ingenious technique of utilizing a through-the-scope (TTS) dilator in helping to expand the space within the common bile duct to allow for full deployment of a mechanical lithotripter and successful clearance of common bile duct stones. This method can be easily applied by advanced endoscopists and is expected to lead to increased success rates of difficult common bile duct stones clearance in a single setting. Use of TTS dilators to increase working space within the common bile duct can be useful in increasing the success rates of mechanical lithotripsy in the setting of large and multiple common bile duct stones. Copyright © 2018 The Authors. Published by Elsevier Ltd.. All rights reserved.

  17. Fluoroscopic guided benign oesophageal stricture dilatation in ...

    African Journals Online (AJOL)

    Gilliard bougienage (SGB) with balloon dilatation and the combination of both methods for the treatment of BOSs in children at Universitas Hospital, Bloemfontein, South Africa. Methods. A retrospective review of the patient notes on all children 12 ...

  18. Anatomical and functional assessment of Tryton bifurcation stent before and after final kissing balloon dilatation: Evaluations by three-dimensional coronary angiography, optical coherence tomography imaging and fractional flow reserve.

    Science.gov (United States)

    Pyxaras, Stylianos A; Toth, Gabor G; Di Gioia, Giuseppe; Ughi, Giovanni J; Tu, Shengxian; Rusinaru, Dan; Adriaenssens, Tom; Reiber, Johan H C; Leon, Martin B; Bax, Jeroen J; Wijns, William

    2017-07-01

    To assess the anatomical and functional impact of final kissing balloon inflation (FKBI) after implantation of a dedicated bifurcation stent system. Current evidence suggests clinical benefit of FKBI in patients undergoing bifurcation dilatation using the Tryton side branch stent (Tryton-SBS). We hypothesized that FKBI improves anatomical reconstruction and functional results of bifurcation treated by Tryton-SBS. An unselected group of patients with complex bifurcation coronary lesions undergoing percutaneous coronary intervention (PCI) with Tryton-SBS underwent paired anatomical assessment with two- and three-dimensional quantitative coronary analysis (2D- and 3D-QCA), and optical coherence tomography (OCT), including 3D reconstruction before and after FKBI. Functional assessment by fractional flow reserve (FFR) was performed in the main branch (MB) and side branch (SB) before and after FKBI. Paired pre- and post-FKBI data were obtained in 10 patients. By OCT imaging, FKBI increased both the SB ostial area (4.93 ± 2.81 vs. 7.43 ± 2.87 mm 2 , P system, FKBI is associated with improved anatomical and functional results at the SB level, without compromising the result at the MB. © 2016 Wiley Periodicals, Inc. © 2016 Wiley Periodicals, Inc.

  19. Major complications after percutaneous nephrostomy--lessons from a department audit

    Energy Technology Data Exchange (ETDEWEB)

    Lewis, S.; Patel, U. E-mail: uday.patel@stgeorges.nhs.uk

    2004-02-01

    four cases [medial renal puncture (n=1), damage due to fascial dilator (n=1) or peelaway sheath (n=2)] and delay in diagnosis/therapy (of 1-8 days, in six of 10 cases of whom four out of six became septic). One pelvic injury required surgical correction (contributory factor-faulty use of peelaway sheath). Patients with haemorrhage settled with prolonged tube drainage alone. CONCLUSION: An adequately staffed percutaneous nephrostomy service can perform within published clinical standards. Best practice factors identified were: attention to agreed protocols and algorithms, pre-procedure antibiotics, careful renal puncture and care with use of dilators/peelaway sheaths, but the paramount finding was that sepsis was the most serious complication, contributing to death (two of 10 in this study) or a significant increase in the level of care required. The risk is greatest after failed instrumentation (retrograde ureteral stent or percutaneous nephrostomy insertion) and particularly if there is a further delay before establishment of renal drainage. A close working relationship between interventional radiologists and urologists is crucial.

  20. Major complications after percutaneous nephrostomy--lessons from a department audit

    International Nuclear Information System (INIS)

    Lewis, S.; Patel, U.

    2004-01-01

    four cases [medial renal puncture (n=1), damage due to fascial dilator (n=1) or peelaway sheath (n=2)] and delay in diagnosis/therapy (of 1-8 days, in six of 10 cases of whom four out of six became septic). One pelvic injury required surgical correction (contributory factor-faulty use of peelaway sheath). Patients with haemorrhage settled with prolonged tube drainage alone. CONCLUSION: An adequately staffed percutaneous nephrostomy service can perform within published clinical standards. Best practice factors identified were: attention to agreed protocols and algorithms, pre-procedure antibiotics, careful renal puncture and care with use of dilators/peelaway sheaths, but the paramount finding was that sepsis was the most serious complication, contributing to death (two of 10 in this study) or a significant increase in the level of care required. The risk is greatest after failed instrumentation (retrograde ureteral stent or percutaneous nephrostomy insertion) and particularly if there is a further delay before establishment of renal drainage. A close working relationship between interventional radiologists and urologists is crucial

  1. Percutaneous Nephrostomy Infusion: Nursing Considerations for Treatment of Upper Urinary Tract Urothelial Carcinoma.

    Science.gov (United States)

    Draganski, Eryn; Sterman, Ellen; Morris, Kathy

    2017-12-01

    An intrarenal approach using a percutaneous nephrostomy tube is a novel method to deliver chemotherapy and biotherapy to patients with upper urinary tract urothelial carcinoma. A paucity of evidence exists regarding basic nursing implications for this unique treatment option. This column will provide suggested guidelines to administer intrarenal treatment via a percutanous nephrostomy tube.
.

  2. One-day transhepatic billary stricture dilatation

    International Nuclear Information System (INIS)

    Mueller, P.R.; Saini, S.; Hahn, P.F.; Silverman, S.G.; Ferrucci, J.T.

    1989-01-01

    To overcome technical problems in percutaneous transhepatic dilatation or biliary strictures, the authors performed the entire procedure in a single session with the patient under general anesthesia (N = 7). Six patients had a biliary-enteric anastomosis, and one patient had a traumatic mid common bile duct stricture. All bile ducts were of normal caliber or were minimally dilated by US or transhepatic cholangiography. Dilatation was performed via a fresh transhepatic drainage catheter in six patients and via an in-dwelling T-tube in one patient. High-pressure balloons (10-12 mm) were placed after catheter dilation of the tract, and balloons were inflated for 5-10 minutes three to five times. Dilation was stopped with a waist was no longer present. No strictures have recurred in patients followed up to 24 months

  3. [Coronary angioplasty using double balloon in artery of large calibre (hugging balloons)].

    Science.gov (United States)

    Centemero, M P; Cano, M N; Maldonado, G; de Almeida, J D; Sousa, A G; Sousa, J E

    1993-07-01

    In this case report the transluminal coronary angioplasty was performed in a oversized right coronary artery with a severe lesion with thrombus inside, using the Hugging balloon technique (two dilatation balloon catheters used simultaneously). This technique achieved minimal residual lesion and had a favorable clinical outcome of the patient.

  4. CT-guided nephrostomy: Re-inventing the wheel for the occasional interventionalist.

    Science.gov (United States)

    Smith, Paul Edmund; Luong, Ian Thuan Hien; van der Vliet, Andrew Hans

    2018-03-12

    Percutaneous nephrostomy insertion has, in recent times, become a subspecialised skill performed by an interventional trained Radiologist. However, this creates access issues, particularly in remote and regional medical centres. In this article, we describe a simple and effective method for computed tomography (CT)-guided percutaneous nephrostomy insertion, utilising the CT interventional skills of the general radiologist. © 2018 The Royal Australian and New Zealand College of Radiologists.

  5. Current trends of balloon laryngoplasty in Thailand.

    Science.gov (United States)

    Moungthong, Greetha; Bunbanjerdsuk, Sacarin; Wright, Nida; Sathavornmanee, Thanakrit; Setabutr, Dhave

    2017-06-01

    To describe the current trend in balloon laryngoplasty usage and experience by practicing otolaryngologists in Thailand. Anonymous 11 question online and paper survey of otolaryngologists on their current balloon laryngoplasty practices. Current practices and experience in balloon laryngoplasty were queried with multiple choice and open-ended questions. Laser use is the most commonly utilized instrument to treat airway stenosis in Thailand. 86% of respondents do not have experience with balloon dilatation; yet, almost half (47.6%) report they perform a minimum of five airway surgeries per year. Most respondents had been in practice for less than 6 years (41%) and reported that they did not have exposure to balloon use during residency training. The largest barrier reported for the use of balloon instrumentation in the airway is inexperience (44.4%) followed by cost (38.3%), yet most feel that treatment in airway stenosis could benefit by usage of balloons (95.5%). Most otolaryngologists in Thailand do not have experience with the use of balloon dilatation and lack of exposure remains the largest barrier to its use. Otolaryngologists in Thailand feel that increased usage of balloons in the airway could improve airway stenosis treatment in the country.

  6. Paschke Dilations

    Directory of Open Access Journals (Sweden)

    Abraham Westerbaan

    2017-01-01

    Full Text Available In 1973 Paschke defined a factorization for completely positive maps between C*-algebras. In this paper we show that for normal maps between von Neumann algebras, this factorization has a universal property, and coincides with Stinespring's dilation for normal maps into B(H.

  7. Percutaneous nephrostomy and antegrade ureteral stenting: technique - indications - complications

    Energy Technology Data Exchange (ETDEWEB)

    Hausegger, Klaus A. [Klagenfurt General Hospital, Department of Radiology, Klagenfurt (Austria); Portugaller, Horst R. [University Hospital of Graz, Department of Radiology, Graz (Austria)

    2006-09-15

    In this review the technique, indication for and complications of percutaneous nephrostomy (PCN) and antegrade ureter stent insertion are described. In the majority of the cases PCN is performed to relieve urinary obstruction, which can be of benign or malignant nature. Another indication for PCN is for treatment of urinary fistulas. PCN can be performed under ultrasound and/or fluoroscopic guidance, with a success rate of more than 90%. The complication rate is approximately 10% for major and minor complications together and 4-5% for major complications only. Percutaneous antegrade double-J stent insertion usually is performed if retrograde ureter stenting has not been successful. However, especially in malignant obstructions, the success rate for antegrade stenting is higher than for retrograde transvesical double-J stent insertion. In the case of severe infection and bleeding after PCN JJ-stent insertion may be contraindicated so long as there is no sufficient concomitant drainage via a PCN. Lower urinary tract dysfunction should be excluded before stent placement. The complication rate is 2-4%. Consequent stent surveillance with regular stent exchange is mandatory. (orig.)

  8. Percutaneous nephrostomy and antegrade ureteral stenting: technique - indications - complications

    International Nuclear Information System (INIS)

    Hausegger, Klaus A.; Portugaller, Horst R.

    2006-01-01

    In this review the technique, indication for and complications of percutaneous nephrostomy (PCN) and antegrade ureter stent insertion are described. In the majority of the cases PCN is performed to relieve urinary obstruction, which can be of benign or malignant nature. Another indication for PCN is for treatment of urinary fistulas. PCN can be performed under ultrasound and/or fluoroscopic guidance, with a success rate of more than 90%. The complication rate is approximately 10% for major and minor complications together and 4-5% for major complications only. Percutaneous antegrade double-J stent insertion usually is performed if retrograde ureter stenting has not been successful. However, especially in malignant obstructions, the success rate for antegrade stenting is higher than for retrograde transvesical double-J stent insertion. In the case of severe infection and bleeding after PCN JJ-stent insertion may be contraindicated so long as there is no sufficient concomitant drainage via a PCN. Lower urinary tract dysfunction should be excluded before stent placement. The complication rate is 2-4%. Consequent stent surveillance with regular stent exchange is mandatory. (orig.)

  9. Percutaneous nephrostomy for deflation and stone treatment, I.

    Science.gov (United States)

    Reuter, H J

    1986-01-01

    A simple technique of percutaneous nephrostomy and renal calculus treatment is reported. The pertaining equipment and method are so highly accomplished today that the majority of stones can be removed percutaneously, largely dispensing with the need for surgical operation. The method has proved particularly efficient in secondary operations. It can be put to work at every urologic department where an X-ray table with closed-circuit TV is available and a surgical team is at hand, ready to cope at once with complications, presenting themselves rarely in the form of secondary bleeding, injury of a nearby organ, etc. Therefore the urologist should be advised to perform the renal puncture himself. Endoscopic removal of the stone, the easier part of the operation, can be carried out in a single session; but for larger stones which are less easy to cope with, it should be done a few days after creation of the fistula, when the tunnel has sufficiently indurated to permit effortless work. The percutaneous method, since it removes the stone at once, is usually superior to the more expensive extracorporeal nephrolithotripsy but the two may complement each other.

  10. Significance of balloon pressure recording during angioplasty

    Energy Technology Data Exchange (ETDEWEB)

    Zollikofer, C.L.; Salomonowitz, E.; Frick, M.P.; Castaneda-Zuniga, W.R.; Amplatz, K.; Bruehlmann, W.F.

    1985-05-01

    During angioplasty of artificial stenoses, atherosclerotic human cadaver arteries, and normal canine arteries, pressure and volume of the dilatation balloons were continuously recorded. We found that a sudden yield of a lesion corresponded to a sudden drop in the pressure curve and an increase of the balloon volume. Volume monitoring was insensitive, but pressure recording was very precise. Continuous pressure recording, using a non-compliant inflation system, correctly demonstrated small breaks and ruptures of atherosclerotic vessels, changes not seen on fluoroscopy.

  11. Single-centre comparison of a novel single-step balloon inflation ...

    African Journals Online (AJOL)

    Objective. A new second-generation balloon dilatation device for percutaneous nephrolithotomy (PCNL) has been launched, promising to challenge the traditional Amplatz serial dilators (ASDs). This device allows for the polyurethane sheath to be deployed on balloon inflation. Our primary objective in this pilot study was to ...

  12. Dilated cardiomyopathy

    International Nuclear Information System (INIS)

    Salvatore, M.; Cuocolo, A.

    1988-01-01

    Radionuclide techniques are easily obtainable, noninvasive examinations that provide useful information in the evaluation, diagnosis and management of patients with dilated cardiomyopathy. The gated blood pool scan allows the assessment of ventricular size, configuration, and wall and septal thickness. These data allow the functional class of the cardiomyopathy (congestive, restrictive or hypertrophic) to be defined. Often THallium-201 myocardial perfusion imaging adds further information and is particularly useful in distinguishing congestive cardiomyopathy from severe coronary artery disease and in depicting septal abnormalities in hipertrophic cardiomyopathy. Useful as these techniques are, they are not substitutes for conventional approaches to diagnosis. Careful history taking and physical examination, as well as scrutiny of the electrocardiogram, chest X-ray and echocardiogram should be standard practice for the evaluation of patients with suspected cardiomyopathy. Judicious use of noninvasive techniques may obviate the need for cardiac catheterization in many patients

  13. The clinical research office of the endourological society percutaneous nephrolithotomy global study: tract dilation comparisons in 5537 patients

    DEFF Research Database (Denmark)

    Lopes, Tomé; Sangam, Kandasami; Alken, Peter

    2011-01-01

    Abstract Purpose: The study focused on the use of balloon or telescopic/serial dilation methods in percutaneous nephrolithotomy (PCNL) in the Global PCNL Study. Patients and Methods: Centers worldwide provided data from consecutive patients who were treated with PCNL during a 1-year period. Tract...... eligible patients were entered in the database from November 2007 to December 2009, including 2277 (41.1%) who received balloon dilation and 3260 (58.9%) who received telescopic/serial dilation. The predominant method used was telescopic/serial dilation in Asia (94.7%) and South America (98...... telescopic/serial dilator group. Clavien scores II and IIIA were slightly in favor of the telescopic/serial dilator group. Median operative time was longer in the balloon dilation group (94.0 min vs 60.0 min). Conclusions: The Global PCNL Study has identified differences in the method of dilation used...

  14. Dilating Eye Drops

    Science.gov (United States)

    ... Frequently Asked Questions Español Condiciones Chinese Conditions Dilating Eye Drops En Español Read in Chinese What are dilating eye drops? Dilating eye drops contain medication to enlarge ( ...

  15. A qualitative study exploring male cancer patients' experiences with percutaneous nephrostomy

    DEFF Research Database (Denmark)

    Bigum, Lene Hyldgaard; Spielmann, Marlène Elisabeth; Juhl, Gitte

    2015-01-01

    of this study was to describe how a nephrostomy is perceived by patients and its effects on their everyday lives. Material and methods. Semi-structured interviews were conducted in the patients' home using a mind map. The inclusion criteria were locally advanced or metastatic urological cancer treated...

  16. The effect of local anesthetic infiltration around nephrostomy tract on postoperative pain control after percutaneous nephrolithotomy.

    Science.gov (United States)

    Tüzel, Emre; Kızıltepe, Günes; Akdoğan, Bülent

    2014-08-01

    The objective of the study was to investigate the effect of a long acting local anesthetic infiltration around nephrostomy tract on pain control after percutaneous nephrolithotomy. Forty-six patients with kidney stones of >2 cm undergoing single access subcostal percutaneous nephrolithotomy (PCNL) were enrolled in the study. Patients were randomized to levobupivacaine (Group I) and saline (Group II) infiltration groups. Group I patients (n = 23) had 75 mg/30 cc levobupivacaine infiltration around the access site after placement of nephrostomy catheter. Group II patients had 30 cc saline infiltration. Postoperatively the patients were given narcotics on demand. Pain scores were collected using a visual analog scale (VAS) at 2, 4, 6, 8, 12 and 24 h postoperatively. The VAS scores, time to analgesic demand, ambulation, and duration of nephrostomy tube were compared between two groups. The mean age was 44 and 45 years in group I and II patients. There were no significant differences between the two groups with regard to demographics, surgery or stone characteristics. Comparison of pain scores at all postoperative time points was not statistically significant between the two groups. Time to first analgesic demand and total narcotic analgesic dose per patient were 1.2 ± 1.05 and 4.04 ± 1.57 h; and 96 and 112 mg for group I and II patients (p = 0.009 and p = 0.41, respectively). Ambulation time and duration of nephrostomy tube were also similar. Infiltration of nephrostomy tract site with levobupivacaine does not have a superior effect compared to saline on postoperative pain control in patients undergoing PCNL.To prolong analgesia, the effect of intermittent tract injections or continuous infusion of local anesthetics for the postoperative maintenance of the local anesthetic effect seems worth to investigate in future studies.

  17. Gastric Outlet Obstruction After Esophagectomy: Retrospective Analysis of the Effectiveness and Safety of Postoperative Endoscopic Pyloric Dilatation.

    Science.gov (United States)

    Maus, Martin K H; Leers, Jessica; Herbold, Till; Bludau, Marc; Chon, Seung-Hun; Kleinert, Robert; Hescheler, Daniel A; Bollschweiler, Elfriede; Hölscher, Arnulf H; Schäfer, Hartmut; Alakus, Hakan

    2016-10-01

    Delayed gastric emptying after esophagectomy with gastric replacement can pose a significant postoperative problem, often leading to aspiration and pneumonia. The present study analyzes retrospectively the effectiveness of endoscopic pyloric dilatation for post-surgical gastric outlet obstruction. Between March 2006 and March 2010, 403 patients underwent a transthoracic en-bloc esophagectomy and reconstruction with a gastric tube and intrathoracic esophagogastrostomy. In patients with postoperative symptoms of an outlet dysfunction and the confirmation by endoscopy, pyloric dilatations were performed without preference with either 20- or 30-mm balloons. A total of 89 balloon dilatations of the pylorus after esophagectomy were performed in 60 (15.6 %) patients. In 21 (35 %) patients, a second dilatation of the pylorus was performed. 55 (61.8 %) dilatations were performed with a 30-mm balloon and 34 (38.2 %) with a 20-mm balloon. The total redilatation rate for the 30-mm balloon was 20 % (n = 11) and 52.9 % (n = 18) for the 20-mm balloon (p gastric emptying leading to postoperative complications after esophagectomy. Endoscopic pyloric dilatation after esophagectomy is a safe procedure for treatment of gastric outlet obstruction. The use of a 30-mm balloon has the same safety profile but a 2.5 lower redilatation rate compared to the 20-mm balloon. Thus, the use of 20-mm balloons has been abandoned in our clinic.

  18. Use of Cutting Balloon in the Treatment of Urethral Stricture: A Novel Technique

    International Nuclear Information System (INIS)

    Yildirim, Erkan; Cicek, Tufan; Istanbulluoglu, Okan; Ozturk, Bulent

    2009-01-01

    The peripheral cutting balloon has been used to treat various nonvascular strictures as well as vascular stenosis. In this article, we describe for the first time the use of the cutting balloon in the treatment of patients with urethral stricture. Four patients with bulbar urethral stricture were included in the study. All strictures were successfully dilated with the cutting balloon, and patients were free of symptoms at 6-month follow-up. Cutting-balloon dilatation is a safe, easy-to-perform, and effective treatment for patients with tight urethral strictures.

  19. Quantitative angiographic comparison of elastic recoil after coronary excimer laser-assisted balloon angioplasty and balloon angioplasty alone.

    Science.gov (United States)

    Strikwerda, S; van Swijndregt, E M; Melkert, R; Serruys, P W

    1995-02-01

    Coronary lumen changes during and after excimer laser-assisted balloon angioplasty were measured by quantitative coronary angiography, and the results were compared with the effects of balloon angioplasty alone. Reduction of atherosclerotic tissue mass by laser ablation in the treatment of coronary artery disease may be more effective in enlarging the lumen than balloon angioplasty alone. A series of 57 consecutive coronary lesions successfully treated by xenon chloride excimer laser-assisted balloon angioplasty were individually matched with 57 coronary artery lesions successfully treated by balloon angioplasty alone. The following variables were measured by quantitative coronary analysis: 1) ablation by laser, 2) stretch by balloon dilation, 3) elastic recoil, and 4) acute gain. Matching by stenosis location, reference diameter and minimal lumen diameter resulted in two comparable groups of 57 lesions with identical baseline stenosis characteristics. Minimal lumen diameter before excimer laser-assisted balloon angioplasty and balloon angioplasty alone were (mean +/- SD) 0.73 +/- 0.44 and 0.74 +/- 0.43 mm, respectively. Laser ablation significantly improved minimal lumen diameter by 0.56 +/- 0.44 mm before adjunctive balloon dilation. In both treatment groups, similar-sized balloon catheters (2.59 +/- 0.35 and 2.56 +/- 0.40 mm, respectively) were used. After laser-assisted balloon angioplasty, elastic recoil was 0.84 +/- 0.30 mm (32% of balloon size), which was identical to that after balloon angioplasty alone, namely, 0.82 +/- 0.32 mm (32%). Consequently, both interventions resulted in similar acute gains of 1.02 +/- 0.52 and 1.00 +/- 0.56 mm, respectively. Minimal lumen diameter after intervention was equal in both groups: 1.75 +/- 0.35 and 1.75 +/- 0.34 mm, respectively. The statistical power of this study in which a 25% difference in elastic recoil (0.2 mm) between groups was considered clinically important was 95%. In matched groups of successfully treated

  20. Cephalic arch stenosis in autogenous brachiocephalic hemodialysis fistulas: results of cutting balloon angioplasty

    DEFF Research Database (Denmark)

    Heerwagen, Søren Thorup; Lönn, Lars; Schroeder, Torben V

    2010-01-01

    Cephalic arch stenosis is a known cause of hemodialysis access failure in patients with brachiocephalic fistulas (BCFs). Outcomes of endovascular treatment are affected by resistance of the stenosis to balloon dilation, a high vein rupture rate and the development of early restenosis. The purpose...... of this retrospective study was to report outcomes after cutting balloon angioplasty (CBA) of cephalic arch stenosis....

  1. Pnematic Dilation in Achalasia

    Directory of Open Access Journals (Sweden)

    Maximilian Bittinger

    2001-01-01

    Full Text Available Pneumatic dilation is the most common first-line therapy for the treatment of achalasia. The aim of dilation is a controlled disruption of circular muscle fibres of the lower esophageal sphincter to reduce the functional obstruction. Several types of dilators and different dilation techniques are used, but the achieved results are similar. The mean success rate is about 80% in the short term, but some patients need redilation in the further course (particularly young patients. Best long term results are obtained if the lower esophageal sphincter pressure can be reduced below 10 mmHg. Major complications are rare after pneumatic dilation; the most serious complication is esophageal perforation, which occurs at a mean rate of about 2.5%. Considering the pros and cons of other effective forms of treatment of achalasia (esophagomyotomy and intrasphincteric injection of botulinum toxin, pneumatic dilation is still the treatment of choice in the majority of patients with achalasia.

  2. Comparison of Dilation Methods in Percutaneous Nephrolithotomy: Which One Is More Successful?

    Science.gov (United States)

    Nalbant, Ismail; Karakoyunlu, Ahmet Nihat; Yesil, Suleyman; Ekici, Musa; Zengin, Kursad; Ozturk, Ufuk; Imamoğlu, Muhammed Abdurrahim

    2016-06-01

    Creation of the access tract is an important step in percutaneous nephrolithotomy (PNL). In this study, we compared the efficiency and safety of Amplatz, Alken, and balloon dilation methods in the creation of the access tract. Data from 487 PNL patients admitted to 517 renal units in 3 centers were analyzed. The Amplatz (280 patients), Alken (142 patients), and balloon (95 patients) dilation methods were compared for their success, duration of the dilation, injury to the collecting system, durations of fluoroscopy and surgery, stone-free and complication rates, pre- and postoperative hematocrit levels, and need for blood transfusion. The dilation methods did not significantly differ with respect to patient demographic data, mean stone area, decrease in hematocrit, need for blood transfusion, unsuccessful tract dilation, injury to the collecting system, stone-free rate, and rate of postoperative complications. The mean fluoroscopy times during Amplatz, Alken, and balloon dilation were 288.52 ± 164.67, 287.34 ± 164.99, and 169.23 ± 21 seconds, respectively. The mean duration of surgery was 96.48 ± 46.07, 94.72 ± 42.25, and 78 ± 25.96 minutes, respectively. The duration of tract creation was 328.67 ± 172.99, 325.14 ± 175.70, and 203.50 ± 32.76 seconds, respectively. The durations of surgery and tract creation were significantly shorter in the balloon dilation group. None of the dilation methods was significantly superior in terms of surgical success, efficiency, or safety. Although balloon dilation was advantageous with respect to time parameters, the role of surgical experience should not be ignored.

  3. Safe Removal of an Encrusted Nephrostomy Tube Using a Vascular Sheath: A Technique Revisited

    Energy Technology Data Exchange (ETDEWEB)

    Farooq, Ammad, E-mail: faroamm@aol.com; Agarwal, Sanjay; Jones, Vaughan [Wrexham Maelor Hospital, Department of Radiology (United Kingdom)

    2013-06-15

    With the advent of interventional radiology and the decrease in mortality from chronic ailments, especially malignancy, percutaneous nephrostomy has become a commonly used safe technique for temporary relief of renal tract obstruction or for urinary diversion. However, these are associated with risks of infection, particularly septicaemia, colonisation, and blockage. Another significant complication is difficulty in removal due to encrustation. We describe a useful technique used in our department for the past few years and cite four cases of variable presentation and complexity for removal of an encrusted nephrostomy tube. No mention of this technique was found recent literature. An almost similar technique was described in the 1980s ''Pollack and Banner (Radiology 145:203-205, 1982), Baron and McClennan (Radiology 141:824, 1981)''. It is possible that experienced operators may have used this technique. We revisit it with pictographic representation, describing its use with currently available equipment, for benefit of operators who are not aware of this technique.

  4. Análise estrutural da laringofaringe e suas implicações na miotomia do cricofaríngeo, na injeção de toxina botulínica e na dilatação por balão Laryngopharyngeal structural analysis and its morphofunctional correlation with cricopharyngeal myotomy, botulinum toxin injection and balloon dilation

    Directory of Open Access Journals (Sweden)

    Milton Melciades Barbosa Costa

    2003-06-01

    positivamente para a melhoria do fluxo faringoesofágico por diminuição da resistência local. A eficiência deste procedimento será dependente da existência de alguma força de ejeção e elevação hiolaríngea. O fascículo transverso do músculo cricofaríngeo é fitado, de pequena espessura, para ser infiltrado por via transcutânea com a toxina botulínica. Talvez por via endoscópica, à semelhança das miotomias, o indicado seria desnervar somente o fascículo transverso do músculo cricofaríngeo. Neste contexto dose, diluição e pontos de infiltração assumem importante papel no uso terapêutico desta neurotoxina em nível do cricofaríngeo. A dilatação por balão pneumático da transição faringoesofágica não parece ser procedimento adequado para região que não apresente estenose fibrótica a ser rompida. Em razão das características anatômicas da transição faringoesofágica, a pressão média de repouso, como registrada pelo método manométrico, não avalia adequadamente a ineficiência ou efetividade da miotomia, da desnervação ou do resultado da dilatação por balão pneumático.BACKGROUND: The cricopharyngeal muscle is of the skeletal type and, in this way, unable to sustain continuous contraction for long periods. Despite of this it has been considered as the responsible by the high pressure area, registered by manometry into the pharyngoesophageal transition. For this reason, it has been the object of therapeutics that promote the rupture of its integrity. AIMS: To give the anatomical bases to define the limits of participation of the cricopharyngeal muscle in the pharyngoesophageal transition function. To consider a morphological and functional alternative to explain the high pressure area on pharyngoesophageal transition and the implications of the myotomy, use of the botulinum toxin and balloon dilatation on pharyngoesophageal transition function. MATERIAL AND METHOD: Study of the laryngopharyngeal region in their morphologic

  5. Biliary transpapillary endoscopic balloon dilation for treating choledocholithiasis.

    Science.gov (United States)

    Daniel, Lubia B; Favaro, Gabriel M; Filho, Tiago F V; Cunha, Marco A B; AparÍcio, Dayse S P; Uemura, Ricardo S; Furuya, Carlos K; Artifon, Everson L A

    2015-01-01

    To evaluate the efficacy and safety of transpapillary papilloplasty in patients with choledocholithiasis. All endoscopic retrograde cholangiopancreatography (ERCP) procedures performed at Hospital Ana Costa, in the city of Santos, Brazil, over the last five years were retrospectively evaluated using the hospital's information database. The success of the procedure and complications due to residual calculi, pancreatitis, bleeding and perforation were evaluated. From January 2010 to May 2014, 1860 ERCP procedures were performed. Fifty-five patients were evaluated here. Their ages ranged from 12 to 98 years (mean, 66.3; standard deviation, 19.34; median, 71). Thirty-two patients (58.2%) were women. Sixteen (29.1%) presented giant choledocholithiasis, with calculi larger than 12 mm. Twenty-seven (49.1%) had mul-tiple choledocholithiasis. In view of the therapeutic efficacy and low complication rate among our patients, we can conclude that endoscopic papilloplasty is a safe and effective method for endoscopic treatment of choledocolithiasis in selected cases.

  6. Percutaneous treatment of extrahepatic bile duct stones assisted by balloon sphincteroplasty and occlusion balloon

    Energy Technology Data Exchange (ETDEWEB)

    Park, Yong Sung; Kim, Ji Hyung; Choi, Young Woo; Lee, Tae Hee; Hwang, Cheol Mog; Cho, Young Jun; Kim, Keum Won [Konyang University Hospital, Daejeon (Korea, Republic of)

    2005-12-15

    To describe the technical feasibility and usefulness of extrahepatic biliary stone removal by balloon sphincteroplasty and occlusion balloon pushing. Fifteen patients with extrahepatic bile duct stones were included in this study. Endoscopic stone removal was not successful in 13 patients, and two patients refused the procedure due to endoscopy phobia. At first, all patients underwent percutaneous transhepatic biliary drainage (PTBD). A few days later, through the PTBD route, balloon assisted dilatation for common bile duct (CBD) sphincter was performed, and then the stones were pushed into the duodenum using an 11.5 mm occlusion balloon. Success rate, reason for failure, and complications associated with the procedure were evaluated. Eight patients had one stone, five patients had two stones, and two patients had more than five stones. The procedure was successful in 13 patients (13/15). In 12 of the patients, all stones were removed in the first trial. In one patients, residual stones were discovered on follow-up cholangiography, and were subsequently removed in the second trial. Technical failure occurred in two patients. Both of these patients had severely dilated CBD and multiple stones with various sizes. Ten patients complained of pain in the right upper quadrant and epigastrium of the abdomen immediately following the procedure, but there were no significant procedure-related complications such as bleeding or pancreatitis. Percutaneous extrahepatic biliary stone removal by balloon sphincteroplasty and subsequent stone pushing with occlusion balloon is an effective, safe, and technically feasible procedure which can be used as an alternative method in patients when endoscopic extrahepatic biliary stone removal was not successful.

  7. Percutaneous treatment of extrahepatic bile duct stones assisted by balloon sphincteroplasty and occlusion balloon

    International Nuclear Information System (INIS)

    Park, Yong Sung; Kim, Ji Hyung; Choi, Young Woo; Lee, Tae Hee; Hwang, Cheol Mog; Cho, Young Jun; Kim, Keum Won

    2005-01-01

    To describe the technical feasibility and usefulness of extrahepatic biliary stone removal by balloon sphincteroplasty and occlusion balloon pushing. Fifteen patients with extrahepatic bile duct stones were included in this study. Endoscopic stone removal was not successful in 13 patients, and two patients refused the procedure due to endoscopy phobia. At first, all patients underwent percutaneous transhepatic biliary drainage (PTBD). A few days later, through the PTBD route, balloon assisted dilatation for common bile duct (CBD) sphincter was performed, and then the stones were pushed into the duodenum using an 11.5 mm occlusion balloon. Success rate, reason for failure, and complications associated with the procedure were evaluated. Eight patients had one stone, five patients had two stones, and two patients had more than five stones. The procedure was successful in 13 patients (13/15). In 12 of the patients, all stones were removed in the first trial. In one patients, residual stones were discovered on follow-up cholangiography, and were subsequently removed in the second trial. Technical failure occurred in two patients. Both of these patients had severely dilated CBD and multiple stones with various sizes. Ten patients complained of pain in the right upper quadrant and epigastrium of the abdomen immediately following the procedure, but there were no significant procedure-related complications such as bleeding or pancreatitis. Percutaneous extrahepatic biliary stone removal by balloon sphincteroplasty and subsequent stone pushing with occlusion balloon is an effective, safe, and technically feasible procedure which can be used as an alternative method in patients when endoscopic extrahepatic biliary stone removal was not successful

  8. Indications for percutaneous nephrostomy in patients with obstructive uropathy due to malignant urogenital neoplasias

    Directory of Open Access Journals (Sweden)

    Frederico R. Romero

    2005-04-01

    Full Text Available INTRODUCTION: Urogenital neoplasias frequently progress with obstructive uropathy due to local spreading or pelvic metastases. The urinary obstruction must be immediately relieved in order to avoid deterioration in these patients. The percutaneous nephrostomy is a safe and effective method for relief the obstruction; however the indications of such procedures have been questioned in patients with poor prognosis. MATERIAL AND METHODS: A retrospective study was performed with 43 patients (29 female and 14 male with urogenital neoplasias who were undergoing percutaneous nephrostomy during a 54-month period. The median age was 52 years. The primary tumoral site was the uterine cervix in 53.5% of patients, the bladder in 23.3%, the prostate in 11.6% and other sites in 11.6%. RESULTS: Postoperative complications occurred in 42.3% of the patients. There was no procedure-related mortality. Thirty-nine per cent of the patients died during the hospitalization period due to advanced neoplasia. The mortality rate was higher in patients with prostate cancer (p = 0.006, in patients over 52 years of age (p = 0.03 and in those who required hemodialysis before the procedure (p = 0.02. Thirty-two per cent of the patients survived long enough to undergo some form of treatment focused on the primary tumor. The survival rate was 40% at 6 months and 24.2% at 12 months. The percentage of the lifetime spent in hospitalization was 17.7%. The survival rate was higher in patients with neoplasia of the uterine cervix (p = 0.007 and in patients with 52 years of age or less (p = 0.008. CONCLUSION: Morbidity was high in this patient group; however, the majority of patients could be discharged from hospital and followed at home. Patients under 52 years of age and patients with neoplasia of the uterine cervix benefited most from the percutaneous nephrostomy when compared to patients with hormone therapy-refractory prostate cancer, bladder cancer or over 52 years of age.

  9. Percutaneous dilatational tracheostomy

    DEFF Research Database (Denmark)

    Johnsen, R.

    2015-01-01

    Introduction Since the introduction and development of percutaneous dilatational tracheostomy (PDT), this procedure is accepted and incorporated in ICUs worldwide. In spite of obvious benefits for the patients, who obtain more comfort and mobility and less use of sedatives, the procedure also...... providers' notes are entered. When searching for -percutaneous dilatation tracheostomy' in the electronic system, we found all patients who had undergone this specific procedure. Afterwards we analyzed each of these patients' hospital records, looking for any periprocedure or postprocedure complications...

  10. MR-guided percutaneous nephrostomy of the contrast-enhanced, nondilated upper urinary tract: initial experimental results; MR-tomographisch gesteuerte perkutane Nephrostomie des kontrastangehobenen, nicht dilatierten oberen Harntraktes: Erste experimentelle Ergebnisse

    Energy Technology Data Exchange (ETDEWEB)

    Nolte-Ernsting, C.C.A.; Buecker, A.; Neuerburg, J.M.; Adam, G.B.; Guenther, R.W. [RWTH Aachen (Germany). Klinik fuer Radiologische Diagnostik; Hunter, D.W. [Minnesota Univ. (United States). Dept. of Radiology

    1998-06-01

    Purpose: To evaluate technique and practicability of MR-guided percutaneous nephrostomy (MRPCN) in an animal model. Methods: In three domestic pigs, a unilateral percutaneous nephrostomy tube was placed into the nondilated collecting system using exclusively MR-guidance with a standard 1.5 T scanner. The urinary tract was visualized by intravenous injection of Gd-DTPA and low-dose furosemide. The entire interventional procedure was controlled using a T{sub 1}-weighted `dual stack` 2D TFE sequence in two orthogonal planes. Results: In all three animals, the puncture needle was safely directed into the nondilated target calyx. Even slight deviations of the needle from the optimal path were readily detected on both MR image planes which enabled immediate correction. This technique successfully achieved a `first attempt` puncture of the targeted calyx in each animal. Over a nitinol guidewire a 5 F catheter was placed into the renal pelvis. Its dysprosium labelled tip was acurately delineated on contrast-enhanced MR images. Conclusions: Percutaneous nephrostomy under MR guidance is a very feasible technique for puncturing the nondilated pelvicalyceal system. This procedure offers some advantages over the current standard modalities. (orig.) [Deutsch] Ziel: Ueberpruefung von Technik und Durchfuehrbarkeit einer MR-tomographisch gesteuerten perkutanen Nephrostomie (MR-PNS) im Tierexperiment. Methoden: Bei drei Hausschweinen wurde eine einseitige perkutane Nephrostomie des nicht dilatierten Hohlraumsystems ausschliesslich unter MR-tomographischer Kontrolle mit einem geschlossenen 1,5-T-System durchgefuehrt. Die Kontrastierung des oberen Harntraktes erfolgte durch eine intravenoese Injektion von Gd-DTPA und niedrigdosiertem Furosemid. Die einzelnen Interventionsschritte wurden mit einem T{sub 1}-gewichteten `Doppel-Schichtstapel` 2D-TFE Sequenz in zwei orthogonalen Schichtebenen kontrolliert. Ergebnisse: Bei allen drei Versuchstieren liess sich die Punktionsnadel unter MR

  11. Evaluation of the Distribution of Paclitaxel After Application of a Paclitaxel-Coated Balloon in the Rabbit Urethra.

    Science.gov (United States)

    Barbalias, Dimitrios; Lappas, Georgios; Ravazoula, Panagiotia; Liourdi, Despoina; Kyriazis, Iason; Liatsikos, Evangelos; Kallidonis, Panagiotis

    2018-03-02

    Urethral strictures are a common urologic problem that could require complex reconstructive procedures. Urethral dilatation represents a frequent practiced intervention associated with high recurrence rates. Drug-coated percutaneous angioplasty balloons (DCBs) with cytostatic drugs have been effectively used for the prevention of vascular restenosis after balloon dilatation. To reduce restenosis rates of urethral dilatation, these balloons could be used in the urethra. Nevertheless, the urothelium is different than the endothelium and these drugs may not be distributed to the outer layers of the urethra. Thus, an experiment was performed to evaluate the distribution of paclitaxel (PTX) in the rabbit urethra after the inflation of a PTX-coated balloon (PCB). Eleven rabbits underwent dilatation of the posterior urethra with common endoscopic balloons after urethrography. Nine of these rabbits were additionally treated with PCB. The urethras of the two control animals were removed along with three more dilated with PCB urethras immediately after the dilatation. The remaining of the urethras were removed after 24 (n = 3) and 48 hours (n = 3). The posterior segments of the urethras were evaluated with hematoxylin and eosin staining as well as with immunohistochemistry with polyclonal anti-PTX antibody. The two control specimens showed denudation of the urothelium after balloon dilatations and no PTX was observed. All specimens from dilated PCB urethras showed distribution of PTX to all layers of the urethra. The specimens that were immediately removed exhibited denudation of the urothelium without any inflammation. The specimens removed at 24 and 48 hours showed mild acute inflammation. PTX was distributed to the urothelial, submucosal, and smooth muscle layers of the normal rabbit urethra immediately after dilatation with a DCB. PTX and mild inflammation were present at the site 24 and 48 hours after the dilatation.

  12. Balloon Command-Control

    Science.gov (United States)

    1977-01-07

    Continuo on reverse side Ii nocosom7’ and identify by block numnber) P cientific Balloons; Balloon flights; Telemetry; Balloon Control; plight Termination... improvements in the ground station which should result in a truly simplified operation. The final modification to the decoder board which appears... improve the sweep range nnd sweep rate, however, the wave shape is still not as good as achieved using an exter..al sine wave oscillator manually

  13. Stenting for curved lesions using a novel curved balloon: Preliminary experimental study.

    Science.gov (United States)

    Tomita, Hideshi; Higaki, Takashi; Kobayashi, Toshiki; Fujii, Takanari; Fujimoto, Kazuto

    2015-08-01

    Stenting may be a compelling approach to dilating curved lesions in congenital heart diseases. However, balloon-expandable stents, which are commonly used for congenital heart diseases, are usually deployed in a straight orientation. In this study, we evaluated the effect of stenting with a novel curved balloon considered to provide better conformability to the curved-angled lesion. In vitro experiments: A Palmaz Genesis(®) stent (Johnson & Johnson, Cordis Co, Bridgewater, NJ, USA) mounted on the Goku(®) curve (Tokai Medical Co. Nagoya, Japan) was dilated in vitro to observe directly the behavior of the stent and balloon assembly during expansion. Animal experiment: A short Express(®) Vascular SD (Boston Scientific Co, Marlborough, MA, USA) stent and a long Express(®) Vascular LD stent (Boston Scientific) mounted on the curved balloon were deployed in the curved vessel of a pig to observe the effect of stenting in vivo. In vitro experiments: Although the stent was dilated in a curved fashion, stent and balloon assembly also rotated conjointly during expansion of its curved portion. In the primary stenting of the short stent, the stent was dilated with rotation of the curved portion. The excised stent conformed to the curved vessel. As the long stent could not be negotiated across the mid-portion with the balloon in expansion when it started curving, the mid-portion of the stent failed to expand fully. Furthermore, the balloon, which became entangled with the stent strut, could not be retrieved even after complete deflation. This novel curved balloon catheter might be used for implantation of the short stent in a curved lesion; however, it should not be used for primary stenting of the long stent. Post-dilation to conform the stent to the angled vessel would be safer than primary stenting irrespective of stent length. Copyright © 2014 Japanese College of Cardiology. Published by Elsevier Ltd. All rights reserved.

  14. Weather Balloon Ascent Rate

    Science.gov (United States)

    Denny, Mark

    2016-05-01

    The physics of a weather balloon is analyzed. The surprising aspect of the motion of these balloons is that they ascend to great altitudes (typically 35 km) at a more or less constant rate. Such behavior is not surprising near the ground—say for a helium-filled party balloon rising from street level to the top of the Empire State building—but it is unexpected for a balloon that rises to altitudes where the air is rarefied. We show from elementary physical laws why the ascent rate is approximately constant.

  15. The Japanese Balloon Program

    Science.gov (United States)

    Nishimura, J.

    The Japanese scientific ballooning program has been organized by ISAS since the institute was founded in mid 1960s. Since then, the balloon group of ISAS has been engaged in the development of the balloon technologies and scientific observations in collaboration with scientists and engineers in other universities and organizations. Here, I describe several subjects of recent activities, the details of some items will also be reported in the separate papers in this meeting.Preparation of a new mobile receiving station.Balloons of made of the EVAL (Ethylene-Vinyl-Alcohol) films. EVAL film has specific Infra-red absorption bands, and is expected to be useful for saving the ballast for a long duration flight.A high altitude balloon with thin polyethylene films achieving at an altitude of above 50km. Further improvement of this type of balloons is continued by inventing how to extrude thin films less than 5 microns of thickness.Recent achievement of Antarctica Flights under the collaboration of ISAS and National Polar Institute.Other new efforts to long duration flights such as satellite link boomerang balloon systems and others.New balloon borne scientific instrumentation for observations of high energy electrons and Anti-protons in cosmic-rays.

  16. Clefting in pumpkin balloons

    Science.gov (United States)

    Baginski, F.; Schur, W.

    NASA's effort to develop a large payload, high altitude, long duration balloon, the Ultra Long Duration Balloon, focuses on a pumpkin shape super-pressure design. It has been observed that a pumpkin balloon may be unable to pressurize into the desired cyclically symmetric equilibrium configuration, settling into a distorted, undesired stable state instead. Hoop stress considerations in the pumpkin design leads to choosing the lowest possible bulge radius, while robust deployment is favored by a large bulge radius. Some qualitative understanding of design aspects on undesired equilibria in pumpkin balloons has been obtained via small-scale balloon testing. Poorly deploying balloons have clefts, but most gores away from the cleft deploy uniformly. In this paper, we present models for pumpkin balloons with clefts. Long term success of the pumpkin balloon for NASA requires a thorough understanding of the phenomenon of multiple stable equilibria and means for quantitative assessment of measures that prevent their occurrence. This paper attempts to determine numerical thresholds of design parameters that distinguish between properly deploying designs and improperly deploying designs by analytically investigating designs in the vicinity of criticality. Design elements which may trigger the onset undesired equilibria and remedial measures that ensure deployment are discussed.

  17. Modified Hydrogen Balloon Explosion.

    Science.gov (United States)

    Lawrence, Stephen S.

    1995-01-01

    Describes the technique of exploding an oxygen-hydrogen balloon using two balloons and having students observe the formation of water droplets. Suggests that the Socratic Method can be used to start discussions related to stochiometry, states of matter, and gas laws. (DDR)

  18. MR-guided percutaneous nephrostomy of the contrast-enhanced, nondilated upper urinary tract: initial experimental results

    International Nuclear Information System (INIS)

    Nolte-Ernsting, C.C.A.; Buecker, A.; Neuerburg, J.M.; Adam, G.B.; Guenther, R.W.; Hunter, D.W.

    1998-01-01

    Purpose: To evaluate technique and practicability of MR-guided percutaneous nephrostomy (MRPCN) in an animal model. Methods: In three domestic pigs, a unilateral percutaneous nephrostomy tube was placed into the nondilated collecting system using exclusively MR-guidance with a standard 1.5 T scanner. The urinary tract was visualized by intravenous injection of Gd-DTPA and low-dose furosemide. The entire interventional procedure was controlled using a T 1 -weighted 'dual stack' 2D TFE sequence in two orthogonal planes. Results: In all three animals, the puncture needle was safely directed into the nondilated target calyx. Even slight deviations of the needle from the optimal path were readily detected on both MR image planes which enabled immediate correction. This technique successfully achieved a 'first attempt' puncture of the targeted calyx in each animal. Over a nitinol guidewire a 5 F catheter was placed into the renal pelvis. Its dysprosium labelled tip was acurately delineated on contrast-enhanced MR images. Conclusions: Percutaneous nephrostomy under MR guidance is a very feasible technique for puncturing the nondilated pelvicalyceal system. This procedure offers some advantages over the current standard modalities. (orig.) [de

  19. Effects of structural injure in the bile bacterial contamination after balloon transduodenal sphincteroplasty (papillary dilation in dogs Efeitos da lesão estrutural na contaminação bacteriana biliar após a esfincteroplastia transduodenal (dilatação papilar em cães

    Directory of Open Access Journals (Sweden)

    Martin Zavadinack Netto

    2006-10-01

    Full Text Available PURPOSE: To evaluate, in dogs, the biliary sphincter subjected to dilation by hydrostatic balloon by the point of view of structural alterations of the papilla and the biochemestry and bacterial contamination of the bile. METHODS: Twenty dogs were submitted to laparotomy, duodenotomy, and enlargement of the major duodenal papilla- GA(n=10 - with balloon of 8mm inflated with pressure of 0,5atm, during 2 minutes or to the sham procedure - GB(n=10. Blood samples collected on times t(0day, t(7days and t(28days were subjected to dosages of alkaline phosphatase (ALP and gamma-glutamyltransferase (GGT for cholestasis evaluation. The collected material from the gall bladder at the same times were registered and numbered to be submitted to culture in BHI, blood agar (rich, non-selective element and Mac Conkey (selective element for Gram-negative bacillus. On the 28th day three fragments of the papilla were tranversally cut by the choledoc axis 3mm from the duodenal papilla and the cuts, stained with hematoxylin-eosin and Masson's tricome, were evaluated according to their inflammatory reaction. RESULTS: The GGT and ALP averages on the three periods in the groups A and B did not show significant differences, not being characterizes the cholestasis. The bacterian contamination was significantly higher in GA (2,19 than in GB (1,96; the contamination was lower in the initial time compared with 7 and 28 days (t0OBJETIVO: Avaliar, em cães, a papila duodenal maior submetida à dilatação por balão hidrostático sob o ponto de vista das alterações estruturais da papila e da bioquímica e contaminação bacteriana da bile. MÉTODOS: Vinte cães foram submetidos a laparotomia, duodenotomia, dilatação da papila maior GA (n=10 - com balão de 8mm insuflado com pressão de 0,5atm, durante 2 minutos ou ao procedimento simulado - GB(n=10. Amostras de sangue coletadas nos tempos t(0dia, t(7dias e t(28dias foram submetidas às dosagens da fosfatase alcalina (FA e

  20. The UK nephrostomy audit. Can a voluntary registry produce robust performance data?

    International Nuclear Information System (INIS)

    Chalmers, N.; Jones, K.; Drinkwater, K.; Uberoi, R.; Tawn, J.

    2008-01-01

    Aim: To investigate the effectiveness of the Royal College of Radiologists Audit Sub-Committee's national prospective registry of percutaneous nephrostomy, which enables participants to audit their practice and compare performance with predetermined standards. Methods: Following a limited retrospective audit, which permitted setting of achievable targets, a dataset was developed and all UK NHS acute hospitals were invited to participate in web-based prospective data collection. Results: Eighty-five out of 285 (29.8%) hospitals contributed 3262 cases over a 29 month period. A satisfactory level of performance was achieved with an overall technical success rate of 98% and a complication rate of 6.3%. Significant risk factors for complications included rigors, anaemia, and impaired renal function. Low frequency operators were shown to have a lower technical success rate and a higher complication rate than high frequency operators; however, target thresholds were exceeded in all groups. Sepsis was identified as a risk factor in the majority of serious complications and all deaths. Some anomalous results were found due to unusual interpretation of the data entry form in two centres, but no evidence of under-performance was identified at any centre. Conclusions: Some weaknesses of the registry are discussed. In view of the low response rate, the possibility of significant bias cannot be excluded. In addition, there is no objective verification of the data; therefore, the results have limited credibility. However, individual centres that accurately completed a representative sample of cases can have confidence that their performance achieves an acceptable standard

  1. Complex Coronary Interventions with the Novel Mozec™ CTO Balloon: The MOZART Registry.

    Science.gov (United States)

    Lupi, Alessandro; Rognoni, Andrea; Schaffer, Alon; Secco, Gioel G; Bongo, Angelo S

    2015-01-01

    Mozec™ CTO is a novel semicompliant rapid-exchange PTCA balloon catheter with specific features dedicated to treat complex coronary lesions like chronic total occlusions (CTOs). However, no data have been reported about the performance of this device in an all-comers population with complex coronary lesions. We evaluated the safety and success rate of Mozec™ CTO balloon in 41 consecutive patients with chronic stable angina and complex coronary lesions (15 severe calcified coronary stenoses, 15 bifurcation lesions with planned two-stent intervention, and 11 CTOs). Safety was assessed reporting the balloon burst rate after inflation exceeding the rated burst pressure (RBP) according to the manufacturer's reference table. Success was defined as the possibility to advance the device further the target lesion. The Mozec™ CTO balloon showed an excellent performance with a 93.3% success in crossing tight and severely calcified lesions (14/15 pts), a 93.3% success in engaging jailed side branches after stent deployment across bifurcations (14/15 pts), and a 90.9% success in crossing CTO lesions (10/11 pts). The burst rate at RBP of the Mozec™ CTO balloon was 6.7% (1/15 balloons) in the tight and severely calcified lesions, 6.7% (1/15 balloons) when dilating jailed vessels, and 9.1% (1/11 balloons) in CTOs. The novel Mozec™ CTO balloon dilatation catheter showed promising results when employed to treat complex lesions in an all-comers population. Further studies should clarify if this kind of balloon might reduce the need of more costly devices like over-the-wire balloons and microcatheters for complex lesions treatment.

  2. Balloon dacryocystoplasty study in the management of adult epiphora.

    LENUS (Irish Health Repository)

    Fenton, S

    2012-02-03

    PURPOSE: To determine the efficacy of dacryocystoplasty with balloon dilation in the treatment of acquired obstruction of the nasolacrimal system in adults. METHODS: Balloon dacryocystoplasty was performed in 52 eyes of 42 patients under general anaesthetic. A Teflon-coated guidewire was introduced through the canaliculus and manipulated through the nasolacrimal system and out of the nasal aperture. A 4 mm wide 3 cm coronary angioplasty balloon catheter was threaded over the guidewire in a retrograde fashion and dilated at the site of obstruction. RESULTS: There was complete obstruction in 30% of cases and partial obstruction in 70%. The most common site of obstruction was the nasolacrimal duct. The procedure was technically successful in 94% of cases. The overall re-obstruction rate was 29% within 1 year of the procedure. There was an anatomical failure rate of 17% for partial obstruction and 69% for complete obstruction within 1 year. CONCLUSIONS: Balloon dacryocystoplasty has a high recurrence rate. There may be a limited role for this procedure in partial obstructions. Further refinements of the procedure are necessary before it can be offered as a comparable alternative to a standard surgical dacryocystorhinostomy.

  3. Risk Factors related to hemorrhage necessitating renal artery embolization after percutaneous nephrostomy

    Energy Technology Data Exchange (ETDEWEB)

    Byon, Jung Hee; Han, Young Min; Jin, Gong Yong; Song, Ji Soo [Chonbuk National University Hospital and Medical School, Jeonju (Korea, Republic of)

    2015-12-15

    To investigate risk factors related to severe bleeding necessitating renal artery embolization (RAE) after percutaneous nephrostomy (PCN). 36 patients who underwent RAE from January 2005 to June 2014 were retrospectively reviewed. Among them, 10 patients underwent embolization because of severe bleeding after PCN (bleeding group). From 1762 patients who underwent PCN in the same period, we selected 21 patients who underwent PCN without bleeding after the procedure (non-bleeding group). We investigated possible related risk factors, such as the presence of underlying diseases, activated partial thromboplastin time (aPTT), prothrombin time (PT), platelet count, puncture site, procedure time, size of the kidney, distance from skin to renal cortex, maximum caliber of the indwelling catheter, parenchymal thickness, and grade of hydronephrosis. We used Fisher's exact test and independent t test for data analyses. We classified hydronephrosis as either 'mild hydronephrosis,' or 'moderate or severe hydronephrosis.' The frequency of mild hydronephrosis was 80.0% (8/10) in the bleeding group and 33.3% (7/21) in the non-bleeding group (p = 0.023). There were no significant differences between the two groups in the incidence of underlying diseases. Similarly, other risk factors (PT, aPTT, platelet count, procedure time, distance from skin to renal cortex, maximum caliber of the indwelling catheter, kidney size, and parenhcymal thickness) also did not differ significantly between the two groups. Mild hydronephrosis is a risk factor for severe bleeding necessitating RAE after PCN. Therefore, when performing PCN, careful attention should be paid to patients with mild hydronephrosis.

  4. Percutaneous nephrolithotripsy under assisted local anaesthesia for ...

    African Journals Online (AJOL)

    T.KH. Fathelbab

    fluoroscopy using high pressure balloon catheter in 35 and Alken's metal dilators in 12 cases. Stones were then retrieved after disintegration in the same cession in 33 patients, while the other 14 patients underwent staged PNL, where a 12 Fr. nephrostomy tube was placed in the first stage, followed by tract dilatation and.

  5. Usefulness of cutting balloon angioplasty for the treatment of congenital heart defects.

    Science.gov (United States)

    Kusa, Jacek; Mazurak, Magdalena; Skierska, Agnieszka; Szydlowski, Leslaw; Czesniewicz, Pawel; Manka, Lukasz

    2017-11-13

    Patients with complex congenital heart defects may have different hemodynamic problems which require a variety of interventional procedures including angioplasty which involves using high-pressure balloons. After failure of conventional balloon angioplasty cutting balloon angioplasty is the next treatment option available. The purpose of this study was to evaluate the safety and efficacy of cutting balloon angioplasty in children with different types of congenital heart defects. Cutting balloon angioplasty was performed in 28 children with different congenital heart defects. The indication for cutting balloon angioplasty was: pulmonary artery stenosis in 17 patients, creating or dilatation of interatrial communication in 10 patients, and stenosis of left subclavian artery in 1 patient. In the pulmonary arteries group there was a significant decrease in systolic blood pressure (SBP) in the proximal part of the artery from the average 74.33 ± 20.4 mm Hg to 55 ± 16.7 mm Hg (p cutting balloon angioplasty was performed after an unsuccessful classic Rashkind procedure. After cutting balloon angioplasty there was a significant widening of the interatrial communication. Cutting balloon angioplasty is a feasible and effective treatment option indifferent congenital heart defects.

  6. Tubeless percutaneous nephrolithotomy with non-absorbable hemostatic sealant (Quikclot®) versus nephrostomy tube placement: a propensity score-matched analysis.

    Science.gov (United States)

    Koo, Kyo Chul; Park, Sang Un; Jang, Ho Sung; Hong, Chang-Hee

    2015-11-01

    The purpose of this study was to determine the efficacy and safety of tubeless percutaneous nephrolithotomy (PNL) using a non-absorbable hemostatic sealant (Quikclot(®)) as an adjunct compared to nephrostomy tube placement in patients exhibiting significant parenchymal bleeding following PNL. We identified 113 PNL cases performed between May 2011 and October 2014. For patients with insignificant parenchymal bleeding following stone removal, defined as a clear visualization of the surgical field at full irrigation of the nephroscope, tubeless PNL was performed. For patients with significant parenchymal bleeding, we introduced the tubeless Quikclot(®) technique as of September 2013 and have performed it ever since. Formerly, nephrostomy placement PNL was performed. In this study, 40 Quikclot(®) applied PNL cases were matched with an equal number of nephrostomy placement cases by propensity scoring based on body mass index, stone size, and Guy's stone score. The mean postoperative drop in hematocrit was comparative between the Quikclot(®) group and the nephrostomy group on both postoperative days 1 (p = 0.459) and 2 (p = 0.325). Quikclot(®) application was associated with lower VAS scores throughout the postoperative period, lower cumulative analgesic requirement (p = 0.025), and with shorter hospitalization (p = 0.002). Complication rates were comparable with no need for blood transfusions in any patients. Tubeless Quikclot(®) PNL was safe and provided effective hemostasis of significant parenchymal bleeding. By avoiding nephrostomy placement, we were able to reduce postoperative pain, analgesic requirements, and hospitalization. Application of Quikclot(®) may be considered prior to nephrostomy placement in patients with significant parenchymal bleeding.

  7. Combined CT- and fluoroscopy-guided nephrostomy in patients with non-obstructive uropathy due to urine leaks in cases of failed ultrasound-guided procedures

    International Nuclear Information System (INIS)

    Sommer, C.M.; Huber, J.; Radeleff, B.A.; Hosch, W.; Stampfl, U.; Loenard, B.M.; Hallscheidt, P.; Haferkamp, A.; Kauczor, H.U.; Richter, G.M.

    2011-01-01

    Aim: To report our experience of combined CT- and fluoroscopy-guided nephrostomy in patients with non-obstructive uropathy due to urine leaks in cases of failed ultrasound-guided procedures. Patients and methods: Eighteen patients (23 kidneys) with non-obstructive uropathy due to urine leaks underwent combined CT- and fluoroscopy-guided nephrostomy. All procedures were indicated as second-line interventions after failed ultrasound-guided nephrostomy. Thirteen males and five females with an age of 62.3 ± 8.7 (40–84) years were treated. Urine leaks developed in majority after open surgery, e.g. postoperative insufficiency of ureteroneocystostomy (5 kidneys). The main reasons for failed ultrasound-guided nephrostomy included anatomic obstacles in the puncture tract (7 kidneys), and inability to identify pelvic structures (7 kidneys). CT-guided guidewire placement into the collecting system was followed by fluoroscopy-guided nephrostomy tube positioning. Procedural success rate, major and minor complication rates, CT-views and needle passes, duration of the procedure and radiation dose were analyzed. Results: Procedural success was 91%. Major and minor complication rates were 9% (one septic shock and one perirenal abscess) and 9% (one perirenal haematoma and one urinoma), respectively. 30-day mortality rate was 6%. Number of CT-views and needle passes were 9.3 ± 6.1 and 3.6 ± 2.6, respectively. Duration of the complete procedure was 87 ± 32 min. Dose-length product and dose-area product were 1.8 ± 1.4 Gy cm and 3.9 ± 4.3 Gy cm 2 , respectively. Conclusions: Combined CT- and fluoroscopy-guided nephrostomy in patients with non-obstructive uropathy due to urine leaks in cases of failed ultrasound-guided procedures was feasible with high technical success and a tolerable complication rate.

  8. Launching Garbage-Bag Balloons.

    Science.gov (United States)

    Kim, Hy

    1997-01-01

    Presents a modification of a procedure for making and launching hot air balloons made out of garbage bags. Student instructions for balloon construction, launching instructions, and scale diagrams are included. (DDR)

  9. Venus Altitude Cycling Balloon Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The ISTAR Group ( IG) and team mate Thin Red Line Aerospace (TRLA) propose a Venus altitude cycling balloon (Venus ACB), an innovative superpressure balloon...

  10. Inflammatory status in patients with rheumatic mitral stenosis: Guilty before and after balloon mitral valvuloplasty

    Directory of Open Access Journals (Sweden)

    Mohamed Ahmed Abdel Rahman

    2016-06-01

    Conclusion: Inflammatory pathogenesis of rheumatic fever, suggested by hsCRP, seems fixed both before, and after BMV. A basal increase in hsCRP before BMV is related to BMV success and an acute increase immediately after BMV seems related to trauma of balloon dilatations.

  11. Cephalic arch stenosis in autogenous brachiocephalic hemodialysis fistulas: results of cutting balloon angioplasty

    DEFF Research Database (Denmark)

    Heerwagen, Søren Thorup; Lönn, Lars; Schroeder, Torben V

    2010-01-01

    Cephalic arch stenosis is a known cause of hemodialysis access failure in patients with brachiocephalic fistulas (BCFs). Outcomes of endovascular treatment are affected by resistance of the stenosis to balloon dilation, a high vein rupture rate and the development of early restenosis. The purpose...

  12. Single-centre comparison of a novel single-step balloon inflation ...

    African Journals Online (AJOL)

    Subject. Single-centre comparison of a novel single-step balloon inflation device and Amplatz sheath dilatation during percutaneous nephrolithotomy – a pilot study. Outcome measures. Single procedure success rates, retreatment rates, hospital stay, haemoglobin concentration, calculi volume, calculi configuration, patient ...

  13. Role of percutaneous nephrostomy in advanced cervical carcinoma with obstructive uropathy: A case series

    Directory of Open Access Journals (Sweden)

    Kamlesh Mishra

    2009-01-01

    Full Text Available Aims and Objective: Over 70% of the cases present in advanced stages of the disease and are associated with poor prognosis and high mortality rates. In many of them, it is difficult to offer definitive treatment as they present in uremia due to associated obstructive uropathy. There are no clear-cut guidelines for performing percutaneous nephrostomy (PCN in patients of advanced cervical cancer. The results are unpredictable in terms of benefits achieved in these cases. Thus, we evaluated our experiences with PCN in the management of cervical cancer patients presenting with obstructive uropathy. Material and Methods: 15 patients of cervical cancer with obstructive uropathy and deranged renal functions were retrospectively evaluated for the role of PCN in their management Results: PCN was done in 15 patients of advanced cervical cancer. The mean age of patients was 44.5 years. Twelve (80% patients presented primarily with advanced cervical carcinoma and obstructive uropathy. Three (20% were already treated. Symptomatic improvement and significant fall of mean serum creatinine value from 7.5 mg% to 0.9 mg% over a period of 1-3 weeks was noted post PCN. Out of 12 patient with primary untreated advanced disease, curative treatment was possible in 3, palliative radiotherapy/chemo-therapy in 7 and only symptomatic treatment in 2 cases, after obstructive uropathy was managed with PCN insertion. Out of 3 already treated patients, 2 were disease free after curative radiotherapy/surgery. PCN was done to prevent permanent kidney damage in them. One patient was defaulter of curative radiotherapy. She had progressive residual disease. Complications like hemorrhage (20%, infection (26%, reinsertion for dislodgment/misplacement (53%, percutaneous leak or perinephric leak (20%, blockage of PCN (33% were noticed. Conclusion: In spite of inherent, albeit manageable complications, PCN is a simple and safe technique. One of the major benefits observed was

  14. Therapeutic balloon-assisted enteroscopy

    NARCIS (Netherlands)

    H. Aktas (Huseyin); P.B.F. Mensink (Peter)

    2009-01-01

    textabstractSince the introduction of the first balloon-based enteroscopic technique in 2001, therapeutic balloon-assisted enteroscopy (BAE) using either the single or double balloon enteroscopy technique (respectively SBE and DBE) has evolved rapidly. Argon plasma coagulation (APC), polypectomy,

  15. Fluid dynamics of dilatant fluid

    DEFF Research Database (Denmark)

    Nakanishi, Hiizu; Nagahiro, Shin-ichiro; Mitarai, Namiko

    2012-01-01

    A dense mixture of granules and liquid often shows a severe shear thickening and is called a dilatant fluid. We construct a fluid dynamics model for the dilatant fluid by introducing a phenomenological state variable for a local state of dispersed particles. With simple assumptions for an equation...

  16. Roentgenoendovascular dilatation of brachycephalic arteries

    International Nuclear Information System (INIS)

    Rabkin, I.Kh.; Kachel, R.; Glazer, F.; Matevosov, A.L.; Dzhoraev, I.G.; Medizinische Akademie, Erfurt

    1988-01-01

    The authors reported the technique, methods of and indications for roentgenoendovascular dilation in stenotic and occlusive lesions of the brachycephalic branches of the aorta. A total of 102 vascular dilations were perfomed in 76 patients resulting in a good angiographic and clinical effect. In 2 patients the first world prosthetics was performed using an original coiled nitinol prosthesis

  17. Adjustable continence balloons

    DEFF Research Database (Denmark)

    Kjær, Line; Fode, Mikkel; Nørgaard, Nis

    2012-01-01

    . Fourteen patients (12%) ended up with an artificial sphincter or a urethral sling. Sixty patients (63%) experienced no discomfort and 58 (61%) reported being dry or markedly improved. Overall, 50 patients (53%) reported being very or predominantly satisfied. Conclusions. Adjustable continence balloons seem...

  18. Application of Mitomycin C after dilation of an anastomotic stricture in a newborn with necrotizing enterocolitis

    Directory of Open Access Journals (Sweden)

    Jonathan Green

    2016-01-01

    Full Text Available Necrotizing enterocolitis (NEC is a common life-threatening condition in premature infants. Bacterial translocation, localized inflammation and subsequent perforation often require surgery for source control and definitive treatment. Small and large intestinal strictures may result from either creation of a surgical anastomosis or the disease process itself. Current methods to treat strictures include, balloon dilation and surgical resection with or without anastomosis. We report the diagnosis and surgical management of a premature infant treated for NEC, who developed an anastomotic stricture and was successfully treated with topical Mitomycin C after balloon stricturoplasty.

  19. Segmental dilatation of the ileum

    Directory of Open Access Journals (Sweden)

    Tune-Yie Shih

    2017-01-01

    Full Text Available A 2-year-old boy was sent to the emergency department with the chief problem of abdominal pain for 1 day. He was just discharged from the pediatric ward with the diagnosis of mycoplasmal pneumonia and paralytic ileus. After initial examinations and radiographic investigations, midgut volvulus was impressed. An emergency laparotomy was performed. Segmental dilatation of the ileum with volvulus was found. The operative procedure was resection of the dilated ileal segment with anastomosis. The postoperative recovery was uneventful. The unique abnormality of gastrointestinal tract – segmental dilatation of the ileum, is described in details and the literature is reviewed.

  20. Vessel dilatation in coronary angiograms

    Energy Technology Data Exchange (ETDEWEB)

    Hinterauer, L.; Goebel, N.

    1983-11-01

    Amongst 166 patients with aneurysms, ectasia or megaloarteries shown on coronary angiograms, 86.1% had dilated vessels as part of generalised coronary sclerosis (usually in patients with three-vessel disease). In 9%, dilatation was of iatrogenic origin and in 4.8% it was idiopathic. One patient had Marfan's syndrome. Amongst 9 000 patients, there were eight with megalo-arteries without stenosis; six of these had atypical angina and three suffered an infarct. Patients with definite dilatation of the coronary artery and stagnation of contrast flow required treatment.

  1. Vessel dilatation in coronary angiograms

    International Nuclear Information System (INIS)

    Hinterauer, L.; Goebel, N.

    1983-01-01

    Amongst 166 patients with aneurysms, ectasia or megaloarteries shown on coronary angiograms, 86.1% had dilated vessels as part of generalised coronary sclerosis (usually in patients with three-vessel disease). In 9%, dilatation was of iatrogenic origin and in 4.8% it was idiopathic. One patient had Marfan's syndrome. Amongst 9 000 patients, there were eight with megalo-arteries without stenosis; six of these had atypical angina and three suffered an infarct. Patients with definite dilatation of the coronary artery and stagnation of contrast flow required treatment. (orig.) [de

  2. Double balloon esophageal catheter for diagnosis of tracheo-esophageal fistula

    International Nuclear Information System (INIS)

    Kiyan, Guersu; Dagli, Tolga E.; Tugtepe, Halil; Kodalli, Nihat

    2003-01-01

    Congenital H-type and recurrent tracheo-esophageal fistulas (TEF) are always difficult to diagnose. For a more accurate diagnosis we designed a new double balloon catheter, which is a modification of esophageal dilatation balloon. The catheter has two balloons to occlude the esophagus proximal and distal to the fistula. The fistula can be identified by passing of the contrast material to the tracheal tree, which was injected into the esophageal segment between the inflated balloons. To prove the efficiency of this catheter, a TEF was created surgically in a New Zealand rabbit. On the postoperative fourteenth day the catheter was tried and the fistula could be visualized easily by injecting the contrast material. We think this technique may be of use in the diagnosis of TEF in children. (orig.)

  3. Blood pressure normalization post-jugular venous balloon angioplasty.

    Science.gov (United States)

    Sternberg, Zohara; Grewal, Prabhjot; Cen, Steven; DeBarge-Igoe, Frances; Yu, Jinhee; Arata, Michael

    2015-05-01

    This study is the first in a series investigating the relationship between autonomic nervous system dysfunction and chronic cerebrospinal venous insufficiency in multiple sclerosis patients. We screened patients for the combined presence of the narrowing of the internal jugular veins and symptoms of autonomic nervous system dysfunction (fatigue, cognitive dysfunction, sleeping disorders, headache, thermal intolerance, bowel/bladder dysfunction) and determined systolic and diastolic blood pressure responses to balloon angioplasty. The criteria for eligibility for balloon angioplasty intervention included ≥ 50% narrowing in one or both internal jugular veins, as determined by the magnetic resonance venography, and ≥ 3 clinical symptoms of autonomic nervous system dysfunction. Blood pressure was measured at baseline and post-balloon angioplasty. Among patients who were screened, 91% were identified as having internal jugular veins narrowing (with obstructing lesions) combined with the presence of three or more symptoms of autonomic nervous system dysfunction. Balloon angioplasty reduced the average systolic and diastolic blood pressure. However, blood pressure categorization showed a biphasic response to balloon angioplasty. The procedure increased blood pressure in multiple sclerosis patients who presented with baseline blood pressure within lower limits of normal ranges (systolic ≤ 105 mmHg, diastolic ≤ 70 mmHg) but decreased blood pressure in patients with baseline blood pressure above normal ranges (systolic ≥ 130 mmHg, diastolic ≥ 80 mmHg). In addition, gender differences in baseline blood pressure subcategories were observed. The coexistence of internal jugular veins narrowing and symptoms of autonomic nervous system dysfunction suggests that the two phenomena may be related. Balloon angioplasty corrects blood pressure deviation in multiple sclerosis patients undergoing internal jugular vein dilation. Further studies should investigate the

  4. Dilatancy in Slow Granular Flows

    Science.gov (United States)

    Kabla, Alexandre J.; Senden, Tim J.

    2009-06-01

    When walking on wet sand, each footstep leaves behind a temporarily dry impression. This counterintuitive observation is the most common illustration of the Reynolds principle of dilatancy: that is, a granular packing tends to expand as it is deformed, therefore increasing the amount of porous space. Although widely called upon in areas such as soil mechanics and geotechnics, a deeper understanding of this principle is constrained by the lack of analytical tools to study this behavior. Using x-ray radiography, we track a broad variety of granular flow profiles and quantify their intrinsic dilatancy behavior. These measurements frame Reynolds dilatancy as a kinematic process. Closer inspection demonstrates, however, the practical importance of flow induced compaction which competes with dilatancy, leading more complex flow properties than expected.

  5. Transjugular balloon mitral valvotomy in a patient with severe kyphoscoliosis

    Directory of Open Access Journals (Sweden)

    George Joseph

    2016-09-01

    Full Text Available Balloon mitral valvotomy (BMV performed by the conventional transfemoral approach can be difficult or even impossible in the presence of structural impediments such as severe kyphoscoliosis, gross cardiac anatomic distortion and inferior vena caval anomalies. A 25-year-old woman with severe thoracolumbar kyphoscoliosis due to poliomyelitis presented with symptomatic rheumatic mitral valve stenosis. After the failure of transfemoral BMV, the procedure was attempted from the right jugular access, using a modified septal puncture technique. The left atrium was entered from the jugular access and the mitral valve was crossed and dilated successfully using over the wire balloon technique. Transjugular BMV is an effective alternative in patients with kyphoscoliotic spine that preclude transfemoral approach. The detailed technique used for the procedure, its advantages as well as the other percutaneous treatment options are also discussed.

  6. Cleft formation in pumpkin balloons

    Science.gov (United States)

    Baginski, Frank E.; Brakke, Kenneth A.; Schur, Willi W.

    NASA’s development of a large payload, high altitude, long duration balloon, the Ultra Long Duration Balloon, centers on a pumpkin shape super-pressure design. Under certain circumstances, it has been observed that a pumpkin balloon may be unable to pressurize into the desired cyclically symmetric equilibrium configuration, settling into a distorted, undesired state instead. Success of the pumpkin balloon for NASA requires a thorough understanding of the phenomenon of multiple stable equilibria and developing of means for the quantitative assessment of design measures that prevent the occurrence of undesired equilibrium. In this paper, we will use the concept of stability to classify cyclically symmetric equilibrium states at full inflation and pressurization. Our mathematical model for a strained equilibrium balloon, when applied to a shape that mimics the Phase IV-A balloon of Flight 517, predicts instability at float. Launched in Spring 2003, this pumpkin balloon failed to deploy properly. Observations on pumpkin shape type super-pressure balloons that date back to the 1980s suggest that within a narrowly defined design class of pumpkin shape super-pressure balloons where individual designs are fully described by the number of gores ng and by a single measure of the bulging gore shape, the designs tend to become more vulnerable with the growing number of gores and with the diminishing size of the bulge radius rB Weight efficiency considerations favor a small bulge radius, while robust deployment into the desired cyclically symmetrical configuration becomes more likely with an increased bulge radius. In an effort to quantify this dependency, we will explore the stability of a family of balloon shapes parametrized by (ng, rB) which includes a design that is very similar, but not identical, to the balloon of Flight 517. In addition, we carry out a number of simulations that demonstrate other aspects related to multiple equilibria of pumpkin balloons.

  7. Cineangiographic findings and balloon catheter angioplasty of pulmonic valvular stenosis

    Energy Technology Data Exchange (ETDEWEB)

    Yeon, Kyung Mo; Yoon, Yong Soo; Kim, In One; Han, Man Chung [College of Medicine, Seoul National University, Seoul (Korea, Republic of)

    1987-08-15

    Transluminal balloon valvuloplasty was performed in the treatment of congenital pulmonic valvular stenosis in 55 children, aged 4 months to 15 years. The right ventricular outflow tract pressure gradient decreased significantly immediately after the procedure from 87.18 {+-} 56mmHg to 29.62 {+-} 26.48mmHg ({rho} < 0.001). Technical success rate was 98% (54/55 patients) and failed case (1 patient) was due to severe fibrous thickening of valve. Complication occurred in one case, that is tricuspid regurgitation (Grade II) due to suspected rupture of chordae tendinae. The degree of pulmonary conus dilatation was closely related with age than the pressure gradient.

  8. VVER ballooning experiments

    International Nuclear Information System (INIS)

    Gyoeri, Cs.; Hozer, Z.; Maroti, L.; Matus, L.

    1998-01-01

    A series of ballooning experiments was performed at the KFKI-AEKI in order to compare the mechanical behaviour and strength of Zircaloy-4 and Zr1%Nb claddings. The effects of temperature, oxidation and iodine absorption on deformation and burst pressure was investigated in almost 100 biaxial tests. Numerical post-test analyses have also been performed with the stand-alone fuel module of the French CATHARE code and the US fuel behaviour code FRAP-T6. Comparing the experimental and the analytical results, relevant differences of high temperature strength due to different α-β phase transition temperature were revealed between the investigated cladding materials. (author)

  9. Percutaneous sharp recanalization of a membranous IVC occlusion with an occlusion balloon as a needle target

    Directory of Open Access Journals (Sweden)

    Michael D. Rivers-Bowerman, MD, MSc, FRCPC

    2017-09-01

    Full Text Available A 50-year-old male with right upper quadrant symptoms and hepatic dysfunction was found to have multiple dilated hepatic veins (HVs with intrahepatic collateralization and membranous occlusion of the intrahepatic inferior vena cava (IVC consistent with primary Budd–Chiari syndrome. Venacavograms depicted drainage of the intrahepatic collaterals through a left-sided HV entering the IVC above the level of the occlusion. Sharp recanalization of the membranous IVC occlusion was performed with an occlusion balloon as a needle target under echocardiographic monitoring followed by balloon angioplasty with restoration of IVC patency. Clinical, laboratory, and venographic procedural success has been demonstrated to 9 months with minimal residual stenosis.

  10. 12. Percutaneous balloon angioplasty for critical aortic coarctation in newborns and infants: Is it still a valid option?

    Directory of Open Access Journals (Sweden)

    Shehla Jadoon

    2015-10-01

    Conclusions: Surgical repair for native neonatal and infantile coarctation is a preferred choice of treatment but it can be challenging in critically sick patients. However, balloon dilation remains a safe and effective temporary palliation for the critically sick patients. Despite of high incidence of restenosis, some patients do not need for mid-term further intervention.

  11. Aerodynamics of a Party Balloon

    Science.gov (United States)

    Cross, Rod

    2007-01-01

    It is well-known that a party balloon can be made to fly erratically across a room, but it can also be used for quantitative measurements of other aspects of aerodynamics. Since a balloon is light and has a large surface area, even relatively weak aerodynamic forces can be readily demonstrated or measured in the classroom. Accurate measurements…

  12. Endoscopic Dilatation versus Oesophageal Stent in Benign Oesophageal Stricture

    Directory of Open Access Journals (Sweden)

    Hadyanto Caputra

    2016-09-01

    Full Text Available Aim: Oesophageal stricture is one of the causes of dysphagia. It is a condition in which the lumen of oesophagus is narrowed by fibrotic tissue in the oesophageal wall. It is usually caused by inflammation or any other cause that leads to necrotizing of tissue. It is mainly differentiated into benign or malignant. The aim of this article is to answer the clinical question on the effectiveness of oesophageal stenting compared to endoscopic dilatation in patient with benign oesophageal stricture due to ingestion of corrosive substances, who had undergone several endoscopic dilatations. Method: We conducted search of relevant articles using PubMed search engine to answer the clinical question. Keywords being used during the search process were: ("oesophageal stricture"[All Fields] OR "oesophageal stenosis"[All Fields] AND (("dilatation"[All Fields] AND ("stents"[MeSH Terms] OR "stents"[All Fields] OR "stent"[All Fields]. Results were further converged by adding specific filters, which were full text articles and clinical trial. Results: The chosen article was further appraised in order to identify its validity and eligibility to answer the clinical question. We chose to use CONSORT (statement to improve the quality of reporting of RCTs to facilitate the critical appraisal and interpretation of RCTs. Conclusion: Stenting was associated with greater dysphagia, co-medication and adverse events. No randomized controlled trials which compared biodegradable stents with other stents or with balloon dilatation was identified. Lack of adequately robust evidence for effectiveness and cost-effectiveness formed the rationale of this trial.

  13. The Effect of Local Anesthetic Infiltration Around Nephrostomy Tract on Postoperative Pain Control after Percutaneous Nephrolithotomy: A Systematic Review and Meta-Analysis.

    Science.gov (United States)

    Wang, Jiawu; Zhang, Chengyao; Tan, Dan; Tan, Guangzhong; Yang, Bo; Chen, Wenkai; Tang, Guoqiang

    2016-01-01

    To assess the safety and efficacy of local anesthetic infiltration around nephrostomy tract on postoperative pain control after percutaneous nephrolithotomy. This systematic review was performed based on randomized clinic trials about local anesthetic infiltration around nephrostomy tract on postoperative pain control. The weighted mean difference (WMD), with their corresponding 95% CI, was calculated to compare continuous variables. Our results showed that the consumption of analgesic was less in the experimental group than in the control group (WMD -25.32, 95% CI -48.09 to -2.55, p = 0.003). There was no significant difference between the mean Visual Analog Scale (VAS) in the experimental group than the control group after 6 h while significantly lower after 24 h. The time of first analgesic demand was significantly longer in the experimental group (WMD 2.19, 95% CI 0.98-3.41). There was no significant difference between 2 groups in terms of operation time, hemoglobin (Hb) alteration, and hospital stay. Local anesthetic infiltration around nephrostomy tract had similar efficacy in the control group in terms of operation time, Hb alteration, and hospital stay, but offers some potential advantages in terms of analgesia requirement, the time of first analgesic demand, and VAS-24 h. However, good quality and large studies with long-term follow-up are warranted for further research. © 2016 S. Karger AG, Basel.

  14. Extensive caustic esophageal stricture in children can be treated by serial dilatations interspersed with silicone-covered nitinol stenting

    Directory of Open Access Journals (Sweden)

    Veronica Alonso

    2016-01-01

    Full Text Available Recurrent esophageal stenosis secondary to caustic ingestion may be challenging to treat. Self-expandable esophageal stents may be an alternative to repetitive endoscopic esophageal dilatation. We report a case of a 2-year-old male child with an extensive esophageal caustic stricture successfully treated using a combination of endoscopic dilatation and stenting. After 5 months of serial balloon dilatations, three nitinol internal silicone covered self-expandable stents were placed through the patient′s gastrostomy spanning the entire esophagus. The stents were positioned using a combination of both endoscopic and fluoroscopic guidance. The procedure was repeated with only one stent 3 months later. A new stricture in the proximal esophagus needed surgical resection and anastomosis, followed by two pneumatic dilatations with progressively longer asymptomatic intervals. The results are promising with the patient able to use his own esophagus; however, this is a single case and optimal stent standing time is still to be determined.

  15. Brain Abscess after Esophageal Dilatation

    DEFF Research Database (Denmark)

    Gaïni, S; Grand, M; Michelsen, J

    2007-01-01

    with malaise, progressive lethargy, fever, aphasia and hemiparesis. Six days before she had been treated with esophageal dilatation for a stricture caused by accidental ingestion of caustic soda. The brain abscess was treated with surgery and antibiotics. She recovered completely. This clinical case...

  16. Air Force Cambridge Research Laboratories balloon operations

    Science.gov (United States)

    Danaher, T. J.

    1974-01-01

    The establishment and functions of the AFCRL balloon operations facility are discussed. The types of research work conducted by the facility are defined. The facilities which support the balloon programs are described. The free balloon and tethered balloon capabilities are analyzed.

  17. 21 CFR 874.4100 - Epistaxis balloon.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Epistaxis balloon. 874.4100 Section 874.4100 Food... DEVICES EAR, NOSE, AND THROAT DEVICES Surgical Devices § 874.4100 Epistaxis balloon. (a) Identification. An epistaxis balloon is a device consisting of an inflatable balloon intended to control internal...

  18. Clinical application of Inoue-balloon in percutaneous transluminal angioplasty for Budd-Chiari syndrome

    International Nuclear Information System (INIS)

    Mei Jian; Qu Jian; Zhu Yaoqing; Wang Lei; Liu Cheng

    2007-01-01

    Objective: To investigate the feasibility and effect of recanalization of inferior vena cava with percutaneous transluminal angioplasty(PTA)by Inoue-balloon. Methods: Eighty-nine patients with Budd-chiari syndrome (BCS )were treated with PTA by Inoue-balloon. Results: After PTA, the median (interquartile range)diameter of hepatic segment inferior vena cava increased from 0.00 (0.20-0.00) cm to 1.90 (2.00 1.47)cm; (P < 0.001), and the mean pressure of inferior vena cava reduced from (20.63 ± 7.22) mmHg to (12.13 ± 5.60) mmHg; (P < 0.001); with only less serious complications as rupture in two cases and without need of prior minor diameter balloon dilation in Inoue-balloon PTA. Conclusion: The advantages of Inoue- balloon PTA for BCS are more reliable and facile than those of polyethylene balloon, and may take the place in the foreseen future. (authors)

  19. Technical feasibility of the implantation of a monorail stent system into the renal arteries without pre-dilatation; Technische Machbarkeit der Implantation eines Monorail-Stent-Systems in die Nierenarterien ohne vorherige Dilatation

    Energy Technology Data Exchange (ETDEWEB)

    Neumann, C.; Dorffner, R. [Krankenhaus der Barmherzigen Brueder, Eisenstadt, Oesterreich (Austria); Gschwendtner, M. [Krankenhaus der Elisabethinen, Linz, Oesterreich (Austria); Karnel, F. [Kaiser-Franz-Josef-Spital, Wien, Oesterreich (Austria); Mair, J. [Krankenhaus der Barmherzigen Schwestern, Linz, Oesterreich (Austria); Dorffner, G. [Inst. fuer Medizinische Kybernetik und Artificial Intelligence, Medizinische Univ. Wien, Oesterreich (Austria)

    2005-01-01

    Purpose: to evaluate the technical feasibility of the implantation of the monorail RX Herculink trademark system into the renal arteries without pre-dilatation. Materials and methods: forty-two patients (mean age 71 years) from four centers with a total of 44 renal artery stenoses underwent implantation of the RX Herculink trademark stent. The mean grade of the stenosis was 83.8%, the mean length 7.5 mm. The stenoses were ostial in 38 cases and in immediate proximity to the ostium in 6 cases. The mean follow-up-period was 57 weeks (24 - 176 weeks). Results: in 42 cases, the implantation was successful without pre-dilatation. In 2 cases, pre-dilatation was carried out. In none of the cases, detachment of the stent from the balloon was observed. In one stenosis with a length of 17 mm, implantation of two stents was performed. In 9 cases, post-dilatation with a larger balloon or higher balloon pressure was necessary. Residual stenoses exceeding 30% were not observed. Two patients developed local bleeding at the puncture site. During the follow-up, restenoses were observed in 5 stents after 26 to 126 weeks, which necessitated a second intervention in 3 cases (PTA in 2 cases, re-stenting in 1 case). The primary patency rate after 6 and 12 months was 0.92 {+-} 0.056 according to Kaplan-Meier, the secondary patency rate after 6 and 12 months was 1.0 {+-} 0.0. Conclusion: implantation of the RX Herculink trademark stent system into the renal arteries without pre-dilatation is technically feasible and safe. Even without pre-dilatation, the stent-system can be advanced through the stenosis without detachment. The complication rate is low. Our clinical results are comparable to previous studies. (orig.)

  20. Balloon Laryngoplasty for Subglottic Stenosis Caused by Orotracheal Intubation at a Tertiary Care Pediatric Hospital

    Directory of Open Access Journals (Sweden)

    Avelino, Melissa Gomes Ameloti

    2014-01-01

    Full Text Available Introduction In recent years, there has been a reduction in mortality rates in neonatal intensive care units (NICUs due to the impact of modern technological advances in the perinatal field. As a consequence, prolonged orotracheal intubation is used more frequently, and there has been an increase in acquired subglottic stenosis (SGS in children. Subglottic stenosis is a narrowing of the endolarynx and one of the most common causes of stridor and respiratory distress in children. The laryngoplasty balloon has proven effective in dealing with stenosis both as primary and secondary treatments, after open surgery, with the added advantage of being less invasive and not requiring external access. Materials and Methods This study involved children from pediatric intensive care units or NICUs suffering from respiratory distress and who presented an endoscopic diagnosis of Myer and Cotton grade I to III SGS. These patients underwent balloon laryngoplasty with different numbers of interventions depending on the response in each individual case. Results All the patients responded satisfactorily to the balloon laryngoplasty. None required tracheostomy after treatment and all remained asymptomatic even after 6-month follow-up. One patient required just 1 dilation, 4 required 2, 3 underwent the procedure 3 times, and another had 5 dilations. Conclusion The experience presented here is that of balloon laryngoplasty post–orotracheal intubation SGS with very satisfactory results at a tertiary care pediatric hospital. Although the number of patients is limited, our incidence corroborates other studies that demonstrate the efficacy and safety of balloon dilatation in the treatment of SGS.

  1. Technical feasibility of the implantation of a monorail stent system into the renal arteries without pre-dilatation

    International Nuclear Information System (INIS)

    Neumann, C.; Dorffner, R.; Gschwendtner, M.; Karnel, F.; Mair, J.; Dorffner, G.

    2005-01-01

    Purpose: to evaluate the technical feasibility of the implantation of the monorail RX Herculink trademark system into the renal arteries without pre-dilatation. Materials and methods: forty-two patients (mean age 71 years) from four centers with a total of 44 renal artery stenoses underwent implantation of the RX Herculink trademark stent. The mean grade of the stenosis was 83.8%, the mean length 7.5 mm. The stenoses were ostial in 38 cases and in immediate proximity to the ostium in 6 cases. The mean follow-up-period was 57 weeks (24 - 176 weeks). Results: in 42 cases, the implantation was successful without pre-dilatation. In 2 cases, pre-dilatation was carried out. In none of the cases, detachment of the stent from the balloon was observed. In one stenosis with a length of 17 mm, implantation of two stents was performed. In 9 cases, post-dilatation with a larger balloon or higher balloon pressure was necessary. Residual stenoses exceeding 30% were not observed. Two patients developed local bleeding at the puncture site. During the follow-up, restenoses were observed in 5 stents after 26 to 126 weeks, which necessitated a second intervention in 3 cases (PTA in 2 cases, re-stenting in 1 case). The primary patency rate after 6 and 12 months was 0.92 ± 0.056 according to Kaplan-Meier, the secondary patency rate after 6 and 12 months was 1.0 ± 0.0. Conclusion: implantation of the RX Herculink trademark stent system into the renal arteries without pre-dilatation is technically feasible and safe. Even without pre-dilatation, the stent-system can be advanced through the stenosis without detachment. The complication rate is low. Our clinical results are comparable to previous studies. (orig.)

  2. A simplified cervix model in response to induction balloon in pre-labour

    Science.gov (United States)

    2013-01-01

    Background Induction of labour is poorly understood even though it is performed in 20% of births in the United States. One method of induction, the balloon dilator applied with traction to the interior os of the cervix, engages a softening process, permitting dilation and effacement to proceed until the beginning of active labour. The purpose of this work is to develop a simple model capable of reproducing the dilation and effacement effect in the presence of a balloon. Methods The cervix, anchored by the uterus and the endopelvic fascia was modelled in pre-labour. The spring-loaded, double sliding-joint, double pin-joint mechanism model was developed with a Modelica-compatible system, MapleSoft MapleSim 6.1, with a stiff Rosenbrock solver and 1E-4 absolute and relative tolerances. Total simulation time for pre-labour was seven hours and simulations ended at 4.50 cm dilation diameter and 2.25 cm effacement. Results Three spring configurations were tested: one pin joint, one sliding joint and combined pin-joint-sliding-joint. Feedback, based on dilation speed modulated the spring values, permitting controlled dilation. Dilation diameter speed was maintained at 0.692 cm·hr-1 over the majority of the simulation time. In the sliding-joint-only mode the maximum spring constant value was 23800 N·m-1. In pin-joint-only the maximum spring constant value was 0.41 N·m·rad-1. With a sliding-joint-pin-joint pair the maximum spring constants are 2000 N·m-1 and 0.41 N·m·rad-1, respectively. Conclusions The model, a simplified one-quarter version of the cervix, is capable of maintaining near-constant dilation rates, similar to published clinical observations for pre-labour. Lowest spring constant values are achieved when two springs are used, but nearly identical tracking of dilation speed can be achieved with only a pin joint spring. Initial and final values for effacement and dilation also match published clinical observations. These results provide a framework for

  3. First-in-human experience using the Volcano VIBE-RX vascular imaging balloon catheter system (Volcano IVUS-guided Balloon Evaluation - New Zealand: VIBE-NZ Study).

    Science.gov (United States)

    Watson, Timothy; El-Jack, Seifeddin; Stewart, James T; Ormiston, John

    2013-09-01

    Intravascular ultrasound (IVUS) is a proven and safe imaging modality used to guide percutaneous coronary intervention (PCI). The Volcano VIBE™ RX Vascular Imaging Balloon Catheter is a novel rapid exchange, 0.014" wire-compatible multi-lumen conventional balloon catheter modified with the addition of an IVUS transducer proximal to the balloon, delivered via a standard 6 Fr sheath. We sought to evaluate the safety, balloon performance, and image quality of the VIBE™ RX in patients scheduled for coronary intervention. Patients aged >21 and <85 years with single or multivessel coronary disease scheduled for PCI due to coronary ischaemic symptoms were included. Those with angiographic features that precluded the safe or informative use of the device were excluded. Twenty-nine patients having angiography because of ischaemic symptoms underwent 44 VIBE RX imaging runs, with balloon dilation in 20. Successful device deployment was achieved in all but one patient. All images were adequate and reproducible. One patient had a non-ST-elevation MI felt to be due to the complexity of the procedure rather than directly related to the VIBE™ RX. The study demonstrated the safety and effectiveness of the VIBE™ RX for its intended purpose with minimal failure rate and no directly related complications.

  4. Oversampling of wavelet frames for real dilations

    DEFF Research Database (Denmark)

    Bownik, Marcin; Lemvig, Jakob

    2012-01-01

    We generalize the Second Oversampling Theorem for wavelet frames and dual wavelet frames from the setting of integer dilations to real dilations. We also study the relationship between dilation matrix oversampling of semi-orthogonal Parseval wavelet frames and the additional shift invariance gain...

  5. US Air Force Balloon Observations

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Worksheets containing pilot balloon data computed from releases at Air Force stations in the western United States. Elevation and azimuth angles are used to compute...

  6. US Daily Pilot Balloon Observations

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Pilot Balloon observational forms for the United States. Taken by Weather Bureau and U.S. Army observers. Period of record 1918-1960. Records scanned from the NCDC...

  7. Retrieving Balloon Data in Flight

    Data.gov (United States)

    National Aeronautics and Space Administration — NASA's Ultra Long Duration Balloon (ULDB) program will soon make flights lasting up to 100 days. Some flights may generate high data rates and retrieving this data...

  8. US Monthly Pilot Balloon Observations

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Monthly winds aloft summary forms summarizing Pilot Balloon observational data for the United States. Generally labeled as Form 1114, and then transitioning to Form...

  9. Superpressure Tow Balloon for Extending Durations and Modifying Trajectories of High Altitude Balloon Systems Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The proposed innovation involves the concept of using a Superpressure Tow Balloon (STB) with existing NASA high altitude balloon designs to form a tandem balloon...

  10. Neurovascular in-stent stenoses: treatment with conventional and drug-eluting balloons.

    Science.gov (United States)

    Vajda, Z; Güthe, T; Perez, M Aguilar; Heuschmid, A; Schmid, E; Bäzner, H; Henkes, H

    2011-01-01

    ISRs remain a major issue in the endovascular management of ICAD, requiring retreatment by reangioplasty. The aim of the present study was to evaluate the technical feasibility, safety, and efficiency of the novel DEBs for neurovascular ISRs. Fifty-one patients (median age, 67 years; age range, 34-82 years; male/female ratio, 37:14) underwent 63 balloon dilation procedures for ISRs in intracranial stented arterial segments between November 2007 and August 2010 in a single center. Of the 63 procedures, 20 (32%) were performed by using a conventional balloon and 43 (68%), by using a paclitaxel-eluting balloon (SeQuent Please). Angiographic and clinical follow-up was performed at 6 and 12 weeks, 6 and 12 months, and yearly thereafter. Technical success rate, periprocedural complications, occurrence of recurrent ischemic symptoms, and the development of a recurrent ISR after reangioplasty were analyzed. Technical success, defined as ISRs with DEBs are encouraging; further technical developments are, nevertheless, mandatory.

  11. Pioneering Space Research with Balloons

    Science.gov (United States)

    Jones, W. V.

    NASA s Scientific Ballooning Planning Team has concluded that ballooning enables significant scientific discoveries while providing test beds for space instruments and training for young scientists Circumpolar flights around Antarctica have been spectacularly successful with fight durations up to 42 days Demand for participation in this Long-Duration Balloon LDB program a partnership with the U S National Science Foundation Office of Polar Programs is greater than the current capacity of two flights per campaign Given appropriate international agreements LDB flights in the Northern Hemisphere would be competitive with Antarctic flights and super-pressure balloons would allow comparable flights at any latitude The Balloon Planning Team made several recommendations for LDB flights provide a reliable funding source for sophisticated payloads extend the Antarctic capability to three flights per year and develop a comparable capability in the Arctic provide aircraft for intact-payload recovery develop a modest trajectory modification capability to enable longer flights and enhance super-pressure balloons to carry 1-ton payloads to 38 km Implementation of these recommendations would facilitate frequent access to near-space for cutting-edge research and technology development for a wide range of investigations

  12. Retrograde prostatic urethroplasty with a balloon catheter

    International Nuclear Information System (INIS)

    Castaneda, F.; Reddy, P.; Hulbert, J.; Letourneau, J.G.; Hunter, D.W.; Castaneda-Zuniga, W.R.; Amplatz, K.

    1987-01-01

    Twenty-five patients with prostatism and documented BPH who were candidates for transurethral resection of the prostate were dilated for 10 minutes with 25-mm urethroplasty balloons using a retrograde transurethral approach. The procedure was performed under local anesthesia using 2% viscous lidocaine on an outpatient basis. A mild discomfort was experienced by all patients with a moderate urgency sensation. Mild transient hematuria was present in all, which cleared in 4 to 6 hours. Dysuria usually lasted for 72 hours. Significant improvement has been seen in the relief of symptoms in patients without middle-lobe hypertrophy as documented by uroflow studies, voiding cystourethrograms, and retrograde urethrograms. In patients with middle-lobe hypertrophy, moderate improvement in uroflow studies was observed, which correlated well with symptomatic improvement. Rectal US and MR studies have shown no evidence of intraprostatic or periprostatic abnormalities. No complications have been encountered so far. The longest current follow-up is 20 months, with a mean of 10 months

  13. Replacement of Dislodged Gastrostomy Tubes After Stoma Dilation in the Pediatric Emergency Department

    Directory of Open Access Journals (Sweden)

    Shiloni Bhambani

    2017-04-01

    Full Text Available Introduction: A dislodged gastrostomy tube (GT is a common complaint that requires evaluation in the pediatric emergency department (ED and, on occasion, will require stoma dilation to successfully replace the GT. The objective of this study was to describe the frequency that stoma dilation is required, the success rate of replacement, complications encountered, and the techniques used to confirm placement of the GT after dilation. Methods: We conducted a retrospective medical record review of children 0–18 years who presented to the pediatric ED from February 2013 through February 2015 with a dislodged GT that required stoma dilation by pediatric emergency physicians with serially increasing Foley catheter sizes prior to successful placement of the GT. Results: We reviewed a total of 302 encounters in 215 patients, with 97 (32% of the encounters requiring stoma dilation prior to replacing a GT. The median amount of dilation was 2 French between the initial Foley catheter size and the final GT size. There was a single complication of a mal-positioned balloon that was identified at the index visit. No delayed complications were encountered. We performed confirmation of placement in all patients. The two most common forms of confirmation were aspiration of gastric contents (56/97 [58%] followed by contrast radiograph in 39 (40%. Conclusion: The practice of serial dilation of a gastrostomy stoma site to allow successful replacement of a gastrostomy tube in pediatric patients who present to the ED with a dislodged gastrostomy tube is generally successful and without increased complication. All patients received at least one form of confirmation for appropriate GT placement with the most common being aspiration of gastric contents.

  14. Sensor System for Super-Pressure Balloon Performance Modeling Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Long-duration balloon flights are an exciting new area of scientific ballooning, enabled by the development of large super-pressure balloons. As these balloons...

  15. Clinical review: Percutaneous dilatational tracheostomy

    Science.gov (United States)

    Al-Ansari, Mariam A; Hijazi, Mohammed H

    2006-01-01

    As the number of critically ill patients requiring tracheotomy for prolonged ventilation has increased, the demand for a procedural alternative to the surgical tracheostomy (ST) has also emerged. Since its introduction, percutaneous dilatational tracheostomies (PDT) have gained increasing popularity. The most commonly cited advantages are the ease of the familiar technique and the ability to perform the procedure at the bedside. It is now considered a viable alternative to (ST) in the intensive care unit. Evaluation of PDT procedural modifications will require evaluation in randomized clinical trials. Regardless of the PDT technique, meticulous preoperative and postoperative management are necessary to maintain the excellent safety record of PDT. PMID:16356203

  16. Non-atherosclerotic spontaneous coronary artery dissection revascularized by intravascular ultrasonography-guided fenestration with cutting balloon angioplasty.

    Science.gov (United States)

    Ito, Tsuyoshi; Shintani, Yasuhiro; Ichihashi, Taku; Fujita, Hiroshi; Ohte, Nobuyuki

    2017-07-01

    A 46-year-old woman was referred to our hospital due to chest pain. Twelve-lead electrocardiogram revealed ST-segment elevation suggesting acute myocardial infarction. Emergent coronary angiography showed diffuse narrowing and occlusion in the middle to distal left anterior descending artery (LAD). To investigate the cause of occlusion, an intravascular ultrasound (IVUS) examination was performed and we diagnosed spontaneous coronary artery dissection (SCAD) as the cause of occlusion. After a cutting balloon was dilated at the distal LAD, coronary flow recovered. IVUS-guided angioplasty with cutting balloon could be a choice of treatment in SCAD patients who need revascularization.

  17. Status of the NASA Balloon Program

    Science.gov (United States)

    Needleman, H. C.; Nock, R. S.; Bawcom, D. W.

    1993-01-01

    The NASA Balloon Program (BP) is examined in an overview of design philosophy, R&D activities, flight testing, and the development of a long-duration balloon for Antarctic use. The Balloon Recovery Program was developed to qualify the use of existing films and to design improved materials and seals. Balloon flights are described for studying the supernova SN1987a, and systems were developed to enhance balloon campaigns including mobile launch vehicles and tracking/data-acquisition systems. The technical approach to long-duration ballooning is reviewed which allows the use of payloads of up to 1350 kg for two to three weeks. The BP is responsible for the development of several candidate polyethylene balloon films as well as design/performance standards for candidate balloons. Specific progress is noted in reliability and in R&D with respect to optimization of structural design, resin blending, and extrusion.

  18. Acoustic Detection from Aerial Balloon Platform

    National Research Council Canada - National Science Library

    Reiff, C; Pham, T; Scanlon, M; Noble, J; Van Landuyt, A; Petek, J; Ratches, J

    2004-01-01

    ... such as unmanned aerial vehicles (UAVs) and balloons. Our most immediate collaboration focuses on the use of acoustic sensors on small balloons and/or aerostats at several elevations and on the ground with the primary goals...

  19. Mars Solar Balloon Lander, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — The Mars Solar Balloon Lander (MSBL) is a novel concept which utilizes the capability of solar-heated hot air balloons to perform soft landings of scientific...

  20. Structure variations of pumpkin balloon

    Science.gov (United States)

    Yajima, N.; Izutsu, N.; Honda, H.

    2004-01-01

    A lobed pumpkin balloon by 3-D gore design concept is recognized as a basic form for a super-pressure balloon. This paper deals with extensions of this design concept for other large pressurized membrane structures, such as a stratospheric airship and a balloon of which volume is controllable. The structural modifications are performed by means of additional ropes, belts or a strut. When the original pumpkin shape is modified by these systems, the superior characteristics of the 3-D gore design, incorporating large bulges with a small local radius and unidirectional film tension, should be maintained. Improved design methods which are adequate for the above subjects will be discussed in detail. Application for ground structures are also mentioned.

  1. Dynamical and hamiltonian dilations of stochastic processes

    International Nuclear Information System (INIS)

    Baumgartner, B.; Gruemm, H.-R.

    1982-01-01

    This is a study of the problem, which stochastic processes could arise from dynamical systems by loss of information. The notions of ''dilation'' and ''approximate dilation'' of a stochastic process are introduced to give exact definitions of this particular relationship. It is shown that every generalized stochastic process is approximately dilatable by a sequence of dynamical systems, but for stochastic processes in full generality one needs nets. (Author)

  2. Aneurysmatic dilatation of the vena portae

    International Nuclear Information System (INIS)

    Dewes, W.; Gormanns, R.; Spangenberger, W.; Staedtisches Krankenhaus Koeln-Merheim

    1986-01-01

    Anomaleous deviations of the portal venous system are relatively rarely obseved, but ineurysmatic dilatation of the vena portae, or one of its main branches, is an absolute rarity. Aneurysma of the vena portae is defined as a circumscribed dilatation of the vene to more than double the volume of the pre- or postaneurysmatic lumen. Modern, high-resolution ultrasound equipment is well able to diagnose with high reliability an aneurysmatic dilatation of the vena portae. (orig.) [de

  3. Complications of balloon packing in epistaxis

    NARCIS (Netherlands)

    Vermeeren, Lenka; Derks, Wynia; Fokkens, Wytske; Menger, Dirk Jan

    2015-01-01

    Although balloon packing appears to be efficient to control epistaxis, severe local complications can occur. We describe four patients with local lesions after balloon packing. Prolonged balloon packing can cause damage to nasal mucosa, septum and alar skin (nasal mucosa, the cartilaginous skeleton

  4. Mechano-transcription of COX-2 is a common response to lumen dilation of the rat gastrointestinal tract

    Science.gov (United States)

    Lin, You-Min; Li, Feng; Shi, Xuan-Zheng

    2014-01-01

    Background In obstructive bowel disorders (OBDs) such as achalasia, pyloric stenosis, and bowel obstruction, the lumen of the affected segments is markedly dilated and the motility function is significantly impaired. We tested the hypothesis that mechanical stress in lumen dilation leads to induction of cyclo-oxygenase-2 (COX-2) in smooth muscle throughout the gastrointestinal (GI) tract, contributing to motility dysfunction. Methods Lumen dilation was induced in vivo with obstruction bands (12 × 3 mm) applied over the lower esophageal sphincter (LES), the pyloric sphincter, and the ileum in rats for 48 hr. Mechanical stretch in vivo was also emulated by balloon distension of the distal colon. Direct stretch of muscle strips from the esophagus, gastric fundus, and ileum was mimicked in an in vitro tissue culture system. Key Results Partial obstruction in the LES, pylorus, and ileum significantly increased expression of COX-2 mRNA and protein in the muscularis externae of the dilated segment oral to the occlusions, but not in the aboral segment. Direct stretch of the lumen in vivo or of muscle strips in vitro markedly induced COX-2 expression. The smooth muscle contractility was significantly suppressed in the balloon distended segments. However, treatment with COX-2 inhibitor NS-398 restored the contractility. Furthermore, in vivo administration of NS-398 in gastric outlet obstruction significantly improved gastric emptying. Conclusions & Inferences Mechanical dilation of the gut lumen by occlusion or direct distension induces gene expression of COX-2 throughout the GI tract. Mechanical stress-induced COX-2 contributes to motility dysfunction in conditions with lumen dilation. PMID:22489918

  5. Simulating clefts in pumpkin balloons

    Science.gov (United States)

    Baginski, Frank; Brakke, Kenneth

    2010-02-01

    The geometry of a large axisymmetric balloon with positive differential pressure, such as a sphere, leads to very high film stresses. These stresses can be significantly reduced by using a tendon re-enforced lobed pumpkin-like shape. A number of schemes have been proposed to achieve a cyclically symmetric pumpkin shape, including the constant bulge angle (CBA) design, the constant bulge radius (CBR) design, CBA/CBR hybrids, and NASA’s recent constant stress (CS) design. Utilizing a hybrid CBA/CBR pumpkin design, Flight 555-NT in June 2006 formed an S-cleft and was unable to fully deploy. In order to better understand the S-cleft phenomenon, a series of inflation tests involving four 27-m diameter 200-gore pumpkin balloons were conducted in 2007. One of the test vehicles was a 1/3-scale mockup of the Flight 555-NT balloon. Using an inflation procedure intended to mimic ascent, the 1/3-scale mockup developed an S-cleft feature strikingly similar to the one observed in Flight 555-NT. Our analysis of the 1/3-scale mockup found it to be unstable. We compute asymmetric equilibrium configurations of this balloon, including shapes with an S-cleft feature.

  6. [Percutanous dilation tracheotomy: our experience].

    Science.gov (United States)

    Domènech, I; Mateu, T; Cisa, E; Juan, A; Gil, E; Palau, M; Dicenta, M

    2004-01-01

    Percutaneous dilation Tracheotomy (PDT) is becoming a popular alternative to surgical tracheotomy. In our hospital, we recently adopted the use of the PDT in intensive care unit patients. The objective [corrected] of this investigation is to characterize and quantify the rate of complications for PDT. A prospective study of 60 PDT performed at different intesive care units, betweem September 2002 to July 2003. The intraoperative time for PDT was 8 minutes. Complications included 6 cases of mild intraoperative hemorrhage, 1 case of moderate intraoperative hemorrhage, 4 cases of mild postoperative hemorrhage and 1 case of subcutaneous emphysema. PDT is a good alternative to surgical tracheotomy and should be added to the otolaryngologists armamentarium of surgical airway procedures.

  7. Stability of the pumpkin balloon

    Science.gov (United States)

    Baginski, Frank

    A large axisymmetric balloon with positive differential pressure, e.g., a sphere, leads to high film stresses. These can be significantly reduced by using a lobed pumpkin-like shape re-enforced with tendons. A number of schemes have been proposed to achieve a cyclically symmetric pumpkin-shape at full inflation, including the constant bulge angle (CBA) design and the constant bulge radius (CBR) design. The authors and others have carried out stability studies of CBA and CBR designs and found instabilities under various conditions. While stability seems to be a good indicator of deployment problems for large balloons under normal ascent conditions, one cannot conclude that a stable design will deploy reliably. Nevertheless, stability analysis allows one to quantify certain deployment characteristics. Ongoing research by NASA's Balloon Program Office utilizes a new design approach developed by Rodger Farley, NASA/GSFC, that takes into account film and tendon strain. We refer to such a balloon as a constant stress (CS) pumpkin design. In June 2006, the Flight 555-NT balloon (based on a hybrid CBR/CBA design) developed an S-cleft and did not deploy. In order to understand the S-cleft phenomena and study a number of aspects related to the CS-design, a series of inflation tests were conducted at TCOM, Elizabeth City, NC in 2007. The test vehicles were 27 meter diameter pumpkins distinguished by their respective equatorial bulge angles (BA). For example, BA98 indicates an equatorial bulge angle of 98° . BA90, BA55, and BA00 are similarly defined. BA98 was essentially a one-third scale version of of the Flight 555 balloon (i.e., 12 micron film instead of 38.1 micron, mini-tendons, etc.). BA90 and BA55 were Farley CS-designs. BA00 was derived from the BA55 design so that a flat chord spanned adjacent tendons. In this paper, we will carry out stability studies of BA98, BA90, BA55, and BA00. We discuss the deployment problem of pumpkin balloons in light of 2007 inflation

  8. Scientific ballooning: Past, present and future

    Science.gov (United States)

    Jones, W. Vernon

    2013-02-01

    Balloons have been used for scientific research since they were invented in France more than 200 years ago. Cosmic rays were discovered 100 years ago with an experiment flown on a manned balloon. A major change in balloon design occurred in 1950 with the introduction of the socalled natural shape balloon with integral load tapes. This basic design has been used with more or less continuously improved materials for scientific balloon flights for the past half century, including long-duration balloon (LDB) flights around Antarctica for the past two decades. The U.S. National Aeronautics and Space Administration (NASA) is currently developing a super-pressure balloon that would enable extended duration missions above 99.5% of the Earth's atmosphere at any latitude. Ultra-long-duration balloon (ULDB) flights enabled by constant-volume balloons should result in an even greater sea change in scientific ballooning than the inauguration of long-duration balloon (LDB) flights in Antarctica during the 1990-91 austral summer.

  9. Present status of dilatative arteriopathy (Dolichoectasia)

    International Nuclear Information System (INIS)

    Wu Xi; Liu Jianmin

    2008-01-01

    Dilatative arteriopathy is also called Dolichoectasia, presenting as enlarged, tortuous, and dilated arteries; especially with involvement of intracranial arteries. The incidence of dolichoectasia is quite low, but it may induce recurrent strokes with poor prognosis and up to now there is no specific management. Our study reviews the potential etiology, epidemiology, symptoms, pathophysiology, prognosis and present status of treatment for dolichoectasia. (authors)

  10. Congenital segmental dilatation of the colon

    African Journals Online (AJOL)

    Congenital segmental dilatation of the colon is a rare cause of intestinal obstruction in neonates. We report a case of congenital segmental dilatation of the colon and highlight the clinical, radiological, and histopathological features of this entity. Proper surgical treatment was initiated on the basis of preoperative radiological ...

  11. Balloon sinuplasty: a new concept in the endoscopic nasal surgery

    Directory of Open Access Journals (Sweden)

    Nogueira Júnior, João Flávio

    2008-12-01

    Full Text Available Introduction: Sinus diseases affect millions of people annually. Clinical treatment is effective in most patients, but in case of failure of this therapy the functional endoscopic surgery is currently the treatment choice for surgical treatment. The objective of the functional endoscopic surgery is to increase the aeration and drainage of the involved paranasal sinuses, which allows for the adequate functioning of the nasal mucosa mucociliary clearance. However, this method still has some limitations, mainly because it removes the nasal mucosa and bone tissue, and it may lead to physiologic alterations of the nasosinusal mucosa and cicatricial fibrosis. Many of these patients could be benefited from less invasive methods, with larger nasal mucosa preservation. Since 2006, an even less invasive procedure was remarked in our specialty: the balloon dilatation of the paranasal sinus ostia. Objective: The objective of this article is to define the concept of sinuplasty, its action mechanism, and present the necessary material for the procedures performance; to describe the techniques with the equipment in a nasosinusal endoscopic surgery simulator model and review the current literature about the indications, complications, results, and follow-up of patients submitted to this procedure. Balloon sinuplasty is safe and appears to be effective in the improvement of the quality of life of patients not responsive to conventional clinical therapy. New applications and indications for this equipment should be described and researched.

  12. ENDOSCOPIC BALLOON DILATATION OF ACQUIRED AIRWAY STENOSIS IN NEWBORN-INFANTS - A PROMISING TREATMENT

    NARCIS (Netherlands)

    ELKERBOUT, SC; VANLINGEN, RA; GERRITSEN, J; ROORDA, RJ

    Acquired stenosis of the trachea or bronchus in newborn infants is a possible complication of perinatal intubation and mechanical ventilation. Although the exact pathophysiology is unknown, stenosis formation seems to be initiated by pressure necrosis. Prematurity is thought to be an important risk

  13. Balloon Dilation of Sinus Ostia in the Department of Defense: Diagnoses, Actual Indications, and Outcomes

    Science.gov (United States)

    2016-05-18

    pre-operative CT findings including Lund-Mackay score for each patient with imaging. Additionally, the sinuses di lated were also recorded, as well as...Aug;28(4):323-9. 4. Chandra RK, Kem RC, Cutler JL, Welch KC, Russell PT. REMODEL larger cohort with long-tenn outcomes and meta-analysis of...diagnostic codes for identifying patients with ulcerative colitis and Crohn’s disease in the Veterans Affairs Health Care System. Dig Dis Sci. 2014 Oct

  14. Percutaneous balloon dilatation of stenotic calyceal diverticular infundibula in patients with recurrent urinary tract infections.

    LENUS (Irish Health Repository)

    Keeling, Aoife N

    2011-02-01

    Renal calyceal diverticula are usually detected as incidental findings on intravenous pyelograms (IVPs) and rarely manifest any clinical signs or symptoms. However, they can interfere with patient\\'s quality of life in a number of instances causing pain, recurrent urinary tract infections (UTIs), abscess, systemic sepsis and calculus formation. The purpose of this study was to review the clinical indications, procedure technique and clinical outcome in all patients referred to Interventional Radiology for the percutaneous management of renal calyceal diverticula.

  15. Balloon Dilatation of Esophageal Strictures in Children With Bullous Epidermolysis: Description of Case Series

    OpenAIRE

    A. V. Tupylenko; M. M. Lohmatov; N. N. Murashkin; E. Y. Dyakonova; I. V. Filinov; S. A. Maksimova; R. V. Epishev; I. A. Surkova; T. N. Budkina; V. I. Oldakovsky

    2017-01-01

    Esophageal strictures are the most common complications of bullous epidermolysis in children. Strictures cause the development of dysphagia that prevents oral alimentation and receipt of an adequate amount of nutrients that is accompanied by a violation of nutritional status, weight loss, and delayed physical development of a child. Disturbed swallowing can also cause aspiration syndrome, pneumonia, and airway obstruction. To eliminate dysphagia and reduce the risk of complications, it is nec...

  16. Renal access in PNL under sonographic guidance: Do we really need to insert an open end ureteral catheter in dilated renal systems? A prospective randomized study.

    Science.gov (United States)

    Eryildirim, Bilal; Tuncer, Murat; Camur, Emre; Ustun, Fatih; Tarhan, Fatih; Sarica, Kemal

    2017-10-03

    To evaluate the true necessity of open end ureteral catheter insertion in patients with moderate to severe pelvicalyceal system dilation treated with percutaneous nephrolithotomy (PNL) under sonographic guidance. 50 cases treated with PNL under sonographic guidance in prone position for solitary obstructing renal stones were evaluated. Patients were randomly divided into two groups; Group 1: Patients in whom a open end ureteral catheter was inserted prior to the procedure; Group 2: Patients receiving no catheter before PNL. In addition to the duration of the procedure as a whole and also all relevant stages as well, radiation exposure time, hospitalization period, mean nephrostomy tube duration, mean drop in Hb levels and all intra and postoperative complications have been evaluated. Mean size of the stones was 308.5 ± 133.2 mm2. Mean total duration of the PNL procedure in cases with open end ureteral catheter was significantly longer than the other cases (p < 0.001). Evaluation of the outcomes of the PNL procedures revealed no statistically significant difference between two groups regarding the stone-free rates (86% vs 84%). Additionally, there was no significant difference with respect to the duration of nephrostomy tube, hospitalization period and secondary procedures needed, complication rates as well as the post-operative Hb drop levels in both groups (p = 0.6830). Our results indicate that the placement of an open end ureteral catheter prior to a PNL procedure performed under sonographic access may not be indicated in selected cases presenting with solitary obstructing renal pelvic and/or calyceal stones.

  17. Development of scientific ballooning in Japan

    Science.gov (United States)

    Nishimura, Jun

    On the occasion of the 50th Anniversary Celebration of COSPAR of this year of 2008, it is worthwhile to summarize the results of the Scientific ballooning in early days in connection with the recent developments in various countries. Nishina Laboratories, Riken, had started the observations of cosmic rays with rubber balloons as early as 1942. However it was interrupted soon by the war II. After the war, new research group started in collaboration with several universities with nuclear emulsions put on the rubber balloons in 1950, and then soon after the group manufactured by themselves and launched the first plastic balloon in 1953. Based on additional technologies during a few years developed by these group, the Institute of Nuclear Study, INS, the University of Tokyo, organized the large campaign of 14 emulsion chambers and a pellicle stack with 8 plastic balloons in 1956. It is to be noted that the project was one of the largest in the world standard in those days. By the experience of this campaign, the importance of the balloon technologies was more recognized, and INS organized the group to study the balloon technologies, and had established some developments. The systematic study of scientific ballooning has started, when the scientific ballooning laboratory was founded in 1965, in the new Institute of ISAS, the University of Tokyo. The permanent balloon base of "Sanriku Balloon Center" was founded in 1971. This group has expended all efforts for the scientific ballooning, launching 10-20 balloons in each year with new inventions such as the studies of; Technologies to manufacture the reliable plastic balloons, New Balloon materials, New instrumentations for scientific ballooning, Systems of long duration flights including Antarctica flights, International collaboratiom, etc. Up to now almost 600 plastic balloons were launched during past 50 years. Then the scientific balloonings have played important and indispensable roles for the development of space

  18. PEBS - Positron Electron Balloon Spectrometer

    CERN Document Server

    von Doetinchem, P.; Kirn, T.; Yearwood, G.Roper; Schael, S.

    2007-01-01

    The best measurement of the cosmic ray positron flux available today was performed by the HEAT balloon experiment more than 10 years ago. Given the limitations in weight and power consumption for balloon experiments, a novel approach was needed to design a detector which could increase the existing data by more than a factor of 100. Using silicon photomultipliers for the readout of a scintillating fiber tracker and of an imaging electromagnetic calorimeter, the PEBS detector features a large geometrical acceptance of 2500 cm^2 sr for positrons, a total weight of 1500 kg and a power consumption of 600 W. The experiment is intended to measure cosmic ray particle spectra for a period of up to 20 days at an altitude of 40 km circulating the North or South Pole. A full Geant 4 simulation of the detector concept has been developed and key elements have been verified in a testbeam in October 2006 at CERN.

  19. Dilational Response of Voided Polycrystals

    Science.gov (United States)

    Savage, Daniel J.; Cazacu, Oana; Knezevic, Marko

    2017-05-01

    Finite-element (FE) cell model computations have been used to gain insights into the ductile response of porous polycrystals. Generally, the behavior of the matrix is described by a J 2-plasticity model. In this article, we present a new computational approach to FE cell models for porous polycrystals deforming by slip based on crystal plasticity. The cell provides the homogenized dilational response, where the constitutive response of every integration point is based on a single-crystal visco-plasticity law. The calculations are performed for a body-centered cubic polycrystal with random texture. Axisymmetric tensile and compressive loadings are imposed corresponding to the fixed values of the stress triaxiality and to two possible values of the Lode parameter. The resulting numerical yield points are compared with those obtained using a J 2-FE cell and an analytical model. The predictions confirm the combined effects of the mean stress and third-invariant on yielding recently revealed by the analytical model.

  20. Percutaneous Management of Ureteral Injuries that are Diagnosed Late After Cesarean Section

    Energy Technology Data Exchange (ETDEWEB)

    Ustunsoz, Bahri; Ugurel, Sahin; Duru, Namik Kemal; Ozgok, Yasar; Ustunsoz, Ayfer [GATA Medical Faculty, Ankara (Turkmenistan)

    2008-08-15

    We wanted to present the results of percutaneous management of ureteral injuries that were diagnosed late after cesarean sections (CS). Twenty-two cases with 24 ureteral injuries that were diagnosed late after CS underwent percutaneous nephrostomy (PN), antegrade double J (DJ) catheter placement and balloon dilatation or a combination of these. The time for making the diagnosis was 21 +- 50.1 days. The injury site was the distal ureter in all cases (the left ureter: 13, the right ureter: 7 and bilateral: 2). Fifteen complete ureteral obstructions were detected in 13 cases. Ureteral leakage due to partial (n = 4) or complete (n = 3) rupture was noted in seven cases. Two cases had ureterovaginal fistula. All the cases were initially confirmed with antegrade pyelography and afterwards they underwent percutaneous nephrostomy. Balloon dilatation was needed in three cases. Antegrade DJ stents were placed in 10 cases, including the three cases with balloon dilatation. Repetititon of percutaneous nephrostomy with balloon dilatation and DJ stent placement was needed in one case with complete obstruction. All the cases were followed-up with US in their first week and then monthly thereafter for up to two years. Eighteen ureters (75%) were managed by percutaneous procedures alone. A total of six ureter injuries had to undergo surgery (25%). Percutaneous management is a good alternative for the treatment of post-CS ureteral injuries that are diagnosed late after CS. Percutaneous management is at least preparatory for a quarter of the cases where surgery is unavoidable

  1. Percutaneous Management of Ureteral Injuries that are Diagnosed Late After Cesarean Section

    International Nuclear Information System (INIS)

    Ustunsoz, Bahri; Ugurel, Sahin; Duru, Namik Kemal; Ozgok, Yasar; Ustunsoz, Ayfer

    2008-01-01

    We wanted to present the results of percutaneous management of ureteral injuries that were diagnosed late after cesarean sections (CS). Twenty-two cases with 24 ureteral injuries that were diagnosed late after CS underwent percutaneous nephrostomy (PN), antegrade double J (DJ) catheter placement and balloon dilatation or a combination of these. The time for making the diagnosis was 21 ± 50.1 days. The injury site was the distal ureter in all cases (the left ureter: 13, the right ureter: 7 and bilateral: 2). Fifteen complete ureteral obstructions were detected in 13 cases. Ureteral leakage due to partial (n = 4) or complete (n = 3) rupture was noted in seven cases. Two cases had ureterovaginal fistula. All the cases were initially confirmed with antegrade pyelography and afterwards they underwent percutaneous nephrostomy. Balloon dilatation was needed in three cases. Antegrade DJ stents were placed in 10 cases, including the three cases with balloon dilatation. Repetititon of percutaneous nephrostomy with balloon dilatation and DJ stent placement was needed in one case with complete obstruction. All the cases were followed-up with US in their first week and then monthly thereafter for up to two years. Eighteen ureters (75%) were managed by percutaneous procedures alone. A total of six ureter injuries had to undergo surgery (25%). Percutaneous management is a good alternative for the treatment of post-CS ureteral injuries that are diagnosed late after CS. Percutaneous management is at least preparatory for a quarter of the cases where surgery is unavoidable

  2. Left ventricular apical ballooning syndrome

    International Nuclear Information System (INIS)

    Rahman, N.; Tai, J.; Soofi, A.

    2007-01-01

    The transient left ventricular apical ballooning syndrome, also known as Takotsubo cardiomyopathy, is characterized by transient left ventricular dysfunction in the absence of obstructive epicardial coronary disease. Although the syndrome has been reported in Japan since 1990, it is rare in other regions. Rapid recognition of the syndrome can modify the diagnostic and therapeutic attitude i.e. avoiding thrombolysis and performing catheterization in the acute phase. (author)

  3. Viscoelastic behaviour of pumpkin balloons

    Science.gov (United States)

    Gerngross, T.; Xu, Y.; Pellegrino, S.

    2008-11-01

    The lobes of the NASA ULDB pumpkin-shaped super-pressure balloons are made of a thin polymeric film that shows considerable time-dependent behaviour. A nonlinear viscoelastic model based on experimental measurements has been recently established for this film. This paper presents a simulation of the viscoelastic behaviour of ULDB balloons with the finite element software ABAQUS. First, the standard viscoelastic modelling capabilities available in ABAQUS are examined, but are found of limited accuracy even for the case of simple uniaxial creep tests on ULDB films. Then, a nonlinear viscoelastic constitutive model is implemented by means of a user-defined subroutine. This approach is verified by means of biaxial creep experiments on pressurized cylinders and is found to be accurate provided that the film anisotropy is also included in the model. A preliminary set of predictions for a single lobe of a ULDB is presented at the end of the paper. It indicates that time-dependent effects in a balloon structure can lead to significant stress redistribution and large increases in the transverse strains in the lobes.

  4. Ballooning stability of JET discharges

    International Nuclear Information System (INIS)

    Huysmans, G.T.A.; Goedbloed, J.P.; Galvao, R.M.O.; Lazzaro, E.; Smeulders, P.

    1989-01-01

    Conditions under which ballooning modes are expected to be excited have recently been obtained in two different types of discharges in JET. In the first type, extremely large pressure gradients have been produced in the plasma core through pellet injections in the current rise phase followed by strong additional heating. In the second type, the total pressure of the discharge is approaching the Troyon limit. The stability of these discharges with respect to the ideal MHD ballooning modes has been studied with the stability code HBT. The equilibria are reconstructed with the IDENTC code using the external magnetic measurements and the experimental pressure profile. The results show that the evaluated high beta discharge is unstable in the central region of the plasma. This instability is related to the low shear and not to a large pressure gradient, as expected at the Troyon limit. In the pellet discharges the regions with the large pressure gradients are unstable to ballooning modes at the time of the beta decay, which ends the period of enhanced performance. The maximum pressure gradient in these discharges is limited by the boundary of the first region of stability. The observed phenomena at the beta decay are similar to those observed at the beta limit in DIII-D and TFTR. (author)

  5. Percutaneous catheter dilatation of carotid stenoses

    International Nuclear Information System (INIS)

    Mathias, K.; Mittermayer, C.; Ensinger, H.; Neff, W.

    1980-01-01

    Thirty-one carotid artery stenoses were produced in thirty dogs by three different techniques. Twenty-three of these could be cured by transfemoral percutaneous catheter dilatation. High grade tight stenoses may present resistance which cannot be overcome by the catheter. Histological examination of the dilated vessels showed circumscribed changes in the vessel wall, with destruction of elastic membranes. From our experience of catheter dilatation of pelvic and lower limb arteries and of renal arteries, we consider it feasible to use this technique in selected patients with carotid stenosis. (orig.) [de

  6. Titan Balloon Convection Model, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — This innovative research effort is directed at determining, quantitatively, the convective heat transfer coefficients applicable to a Montgolfiere balloon operating...

  7. Genetics Home Reference: familial dilated cardiomyopathy

    Science.gov (United States)

    ... familial dilated cardiomyopathy can include an irregular heartbeat (arrhythmia), shortness of breath (dyspnea), extreme tiredness (fatigue), fainting ... Celebrates Its 15th Anniversary National DNA Day 2018 Newborn Screening Saves Lives Act Turns 10 All Bulletins ...

  8. An Erupted Dilated Odontoma: A Rare Presentation

    Directory of Open Access Journals (Sweden)

    Gaurav Sharma

    2016-01-01

    Full Text Available A dilated odontoma is an extremely rare developmental anomaly represented as a dilatation of the crown and root as a consequence of a deep, enamel-lined invagination and is considered a severe variant of dens invaginatus. An oval shape of the tooth lacking morphological characteristics of a crown or root implies that the invagination happened in the initial stages of morphodifferentiation. Spontaneous eruption of an odontoma is a rare occurrence and the occurrence of a dilated odontoma in a supernumerary tooth is even rarer with only a few case reports documented in the English literature. We present an extremely rare case of erupted dilated odontoma occurring in the supernumerary tooth in anterior maxillary region in an 18-year-old male, which, to the best of our knowledge, is the first ever case reported in English literature.

  9. An Erupted Dilated Odontoma: A Rare Presentation

    Science.gov (United States)

    Sharma, Gaurav; Nagra, Amritpreet; Singh, Gurkeerat; Nagpal, Archna; Soin, Atul; Bhardwaj, Vishal

    2016-01-01

    A dilated odontoma is an extremely rare developmental anomaly represented as a dilatation of the crown and root as a consequence of a deep, enamel-lined invagination and is considered a severe variant of dens invaginatus. An oval shape of the tooth lacking morphological characteristics of a crown or root implies that the invagination happened in the initial stages of morphodifferentiation. Spontaneous eruption of an odontoma is a rare occurrence and the occurrence of a dilated odontoma in a supernumerary tooth is even rarer with only a few case reports documented in the English literature. We present an extremely rare case of erupted dilated odontoma occurring in the supernumerary tooth in anterior maxillary region in an 18-year-old male, which, to the best of our knowledge, is the first ever case reported in English literature. PMID:26989523

  10. Basal wall hypercontraction of Takotsubo cardiomyopathy in a patient who had been diagnosed with dilated cardiomyopathy: a case report.

    Science.gov (United States)

    Ichihara, Noboru; Fujita, Shuichi; Kanzaki, Yumiko; Fujisaka, Tomohiro; Ozeki, Michishige; Ishizaka, Nobukazu

    2017-12-12

    Takotsubo cardiomyopathy is characterized by the basal hypercontractility and apical ballooning of the left ventriculum and T-wave inversion in the electrocardiogram. It has been suggested that Takotsubo cardiomyopathy might underlie the pathogenesis of persistent cardiac dysfunction; however, few reports are present demonstrating the advent of Takotsubo cardiomyopathy in patients with idiopathic cardiomyopathy. A 64-year-old women was admitted due to dyspnea on effort and lower extremity edema. She had been diagnosed with idiopathic dilated cardiomyopathy 2.5 years before owing to the reduced left ventricular ejection fraction (24%), normal coronary artery, and interstitial fibrosis of the myocardial samples. On admission, her electrocardiogram showed giant negative T wave in II, III, aVF, and precordial leads. Echocardiography showed dyskinesis of the left ventricular apex and hypercontraction of the basal wall, which had not been observed in the previous examinations. Coronary angiography showed normal coronary arteries, and apical ballooning and basal hypercontractility was confirmed by left ventriculography. On day 15 of admission, contraction of apical wall was recovered, and basal hypercontraction was disappeared. The present case is the first report demonstrating appearance the transient basal wall hypercontraction along with the advent of Takotsubo cardiomyopathy in a patient diagnosed with dilated cardiomyopathy. Whether such findings are indicative of fair prognosis and have the utility of understanding the pathogenesis of dilated cardiomyopathy needs further investigation.

  11. On $rho$-dilations of commuting operators

    Czech Academy of Sciences Publication Activity Database

    Müller, Vladimír

    2017-01-01

    Roč. 78, č. 1 (2017), s. 3-20 ISSN 0379-4024 R&D Projects: GA ČR(CZ) GA14-07880S Institutional support: RVO:67985840 Keywords : regular unitary dilation * rho-dilation Subject RIV: BA - General Mathematics OBOR OECD: Pure mathematics Impact factor: 0.524, year: 2016 http://www.mathjournals.org/jot/2017-078-001/2017-078-001-001.html

  12. On $rho$-dilations of commuting operators

    Czech Academy of Sciences Publication Activity Database

    Müller, Vladimír

    2017-01-01

    Roč. 78, č. 1 (2017), s. 3-20 ISSN 0379-4024 R&D Projects: GA ČR(CZ) GA14-07880S Institutional support: RVO:67985840 Keywords : regular unitary dilation * rho-dilation Subject RIV: BA - General Mathematics OBOR OECD: Pure mathematics Impact factor: 0.524, year: 2016 http://www.mathjournals.org/jot/2017-078-001/2017-078-001-001. html

  13. Comparison between double-balloon and single-balloon enteroscopy in therapeutic ERC after Roux-en-Y entero-enteric anastomosis.

    Science.gov (United States)

    Moreels, Tom G; Pelckmans, Paul A

    2010-09-16

    To compare the efficacy of double-balloon enteroscopy (DBE) and single-balloon enteroscopy (SBE) in therapeutic endoscopic retrograde cholangiography (ERC) in patients with Roux-en-Y entero-enteric anastomosis. Retrospective analysis of our patient cohort revealed 4 patients with enterobiliary anastomosis and Roux-en-Y entero-enteric anastomosis who underwent repeated ERC with DBE and SBE because of recurrent cholangitis. A total of 38 endoscopic retrograde cholangiopancreatography procedures were performed in 25 patients with Roux-en-Y entero-enteric anastomosis. DBE was used in 29 procedures and SBE in 9. The 4 patients who underwent repeated ERC with DBE and SBE suffered from recurrent cholangitis due to stenosis of the enterobiliary anastomosis. ERC was performed repeatedly to achieve balloon dilation with/without biliary stone extraction and multiple stent placement at the level of the enterobiliary anastomosis. In all 4 patients DBE and SBE were equally successful. Compared to DBE, SBE was equally effective in passing the Roux-en-Y entero-enteric anastomosis, reaching the enterobiliary anastomosis and performing therapeutic ERC. This retrospective comparison shows that DBE and SBE are equally successful in the performance of therapeutic ERC at the level of the enterobiliary anastomosis after Roux-en-Y entero-enteric anastomosis.

  14. Simulation of stratospheric balloon environment

    International Nuclear Information System (INIS)

    Sable, C.

    1974-01-01

    The behavior of materials used for the construction of stratospheric balloons is studied at DERTS by means of irradiations performed in reals time and simulating the exact flight environment. Two chambers were designed in the laboratory and are described together with the experimental procedure. In order to reduce cost and save time, it is worth accelerating the simulation when only a preliminary evaluation of the sample's properties is required. For this reason, a systematic study was undertaken in order to evaluate the respective effects of different parameters on the material degradation. The results of this study are given [fr

  15. Pneumatic Dilation of the Lower Esophageal Sphincter Can Now Be Successfully Performed Without Morbidity.

    Science.gov (United States)

    Jia, Yi; Bustamante, Marco; Moraveji, Sharareh; McCallum, Richard W

    2016-11-01

    Patients with dysphagia may be diagnosed with impaired lower esophageal sphincter (LES) relaxation and treated with pneumatic dilation (PD), stretching and tearing LES muscle fibers. Esophageal perforation has been reported to be as high as 10%. We conducted a retrospective study to evaluate the perforation rate of PD when used for impaired relaxation of the LES using current techniques. A chart review was conducted to identify patients referred for esophageal manometry by high-resolution manometry and later received PD from January 2013 to April 2016. The diagnoses of achalasia, gastroesophageal junction outlet obstruction or hypertensive LES with accompanying impaired LES relaxation were based on the Chicago Classification III. Demographic data, clinical findings, treatment approaches and outcomes were explored. A total of 187 patients were referred for dysphagia and had esophageal manometry during this time frame. In all, 62 patients (34 female), mean age of 52 years, met the criteria for incomplete relaxation of the LES and underwent a total of 88 PD procedures. All initial PD procedures used the 30-mm diameter balloon, 18 subsequently required a 35-mm balloon and 8 went on to 40-mm balloon size. No perforations or other complications were documented by esophagogastroduodenoscopy, gastrografin testing immediately postdilation or by subsequent clinical outcome. PD by an experienced gastroenterologist using general anesthesia, fluoroscopic guidance, Rigiflex balloon equipment and a specific repetitive technique can be successfully performed without perforation. Hence, the already known therapeutic efficacy of PD can now be combined with the knowledge that there is essentially no accompanying perforation rate. Copyright © 2016 Southern Society for Clinical Investigation. Published by Elsevier Inc. All rights reserved.

  16. Early Cosmic Ray Research with Balloons

    Energy Technology Data Exchange (ETDEWEB)

    Walter, Michael, E-mail: michael.walter@desy.de

    2013-06-15

    The discovery of cosmic rays by Victor Hess during a balloon flight in 1912 at an altitude of 5350 m would not have been possible without the more than one hundred years development of scientific ballooning. The discovery of hot air and hydrogen balloons and their first flights in Europe is shortly described. Scientific ballooning was mainly connected with activities of meteorologists. It was also the geologist and meteorologist Franz Linke, who probably observed first indications of a penetrating radiation whose intensity seemed to increase with the altitude. Karl Bergwitz and Albert Gockel were the first physicists studying the penetrating radiation during balloon flights. The main part of the article deals with the discovery of the extraterrestrial radiation by V. Hess and the confirmation by Werner Kolhörster.

  17. Dilatation or no dilatation of the cervix during cesarean section (Dondi Trial): a randomized controlled trial.

    Science.gov (United States)

    Kirscht, Jade; Weiss, Christel; Nickol, Jana; Berlit, Sebastian; Tuschy, Benjamin; Hoch, Benjamin; Trebin, Amelie-Verena; Große-Steffen, Thomas; Sütterlin, Marc; Kehl, Sven

    2017-01-01

    To assess the effects of mechanical dilatation of the cervix during cesarean section on postoperative morbidity. A total of 447 women with elective cesarean section were included in the Dondi trial (Dilatation or no dilatation of the cervix during cesarean section). The primary outcome measure of this randomized controlled trial was postpartum hemorrhage (PPH) within 6 weeks. Infectious morbidity (puerperal fever, endometritis, wound infection, and urinary tract infection), blood loss (need for blood transfusion or change in hemoglobin levels), and operating time were also evaluated. The rate of PPH within 6 weeks was not different between the two groups [dilatation group: 5 (2.4 %), no dilatation group: 3 (1.2 %), p = 0.479]. Infectious morbidity, blood loss, and operating time were not diverse as well. The only significant difference between the two groups was the rate of retained products of conception with fewer cases after cervical dilatation (0 versus 6.2 %, p cesarean section compared with no dilatation of the cervix did not influence the risk of postpartum hemorrhage. However, there were fewer cases with retained products of conception after dilatation.

  18. The neural substrates of subjective time dilation

    Directory of Open Access Journals (Sweden)

    Marc Wittmann

    2010-02-01

    Full Text Available An object moving towards an observer is subjectively perceived as longer in duration than the same object that is static or moving away. This 'time dilation effect' has been shown for a number of stimuli that differ from standard events along different feature dimensions (e.g. color, size, and dynamics. We performed an event-related functional magnetic resonance imaging (fMRI, while subjects viewed a stream of five visual events, all of which were static and of identical duration except the fourth one, which was a deviant target consisting of either a looming or a receding disc. The duration of the target was systematically varied and participants judged whether the target was shorter or longer than all other events. A time dilation effect was observed only for looming targets. Relative to the static standards, the looming as well as the receding targets induced increased activation of the anterior insula and anterior cingulate cortices (the “core control network”. The decisive contrast between looming and receding targets representing the time dilation effect showed strong asymmetric activation and, specifically, activation of cortical midline structures (the “default network”. These results provide the first evidence that the illusion of temporal dilation is due to activation of areas that are important for cognitive control and subjective awareness. The involvement of midline structures in the temporal dilation illusion is interpreted as evidence that time perception is related to self-referential processing.

  19. Impairment of flow-mediated dilation correlates with aortic dilation in patients with Marfan syndrome.

    Science.gov (United States)

    Takata, Munenori; Amiya, Eisuke; Watanabe, Masafumi; Omori, Kazuko; Imai, Yasushi; Fujita, Daishi; Nishimura, Hiroshi; Kato, Masayoshi; Morota, Tetsuro; Nawata, Kan; Ozeki, Atsuko; Watanabe, Aya; Kawarasaki, Shuichi; Hosoya, Yumiko; Nakao, Tomoko; Maemura, Koji; Nagai, Ryozo; Hirata, Yasunobu; Komuro, Issei

    2014-07-01

    Marfan syndrome is an inherited disorder characterized by genetic abnormality of microfibrillar connective tissue proteins. Endothelial dysfunction is thought to cause aortic dilation in subjects with a bicuspid aortic valve; however, the role of endothelial dysfunction and endothelial damaging factors has not been elucidated in Marfan syndrome. Flow-mediated dilation, a noninvasive measurement of endothelial function, was evaluated in 39 patients with Marfan syndrome. Aortic diameter was measured at the aortic annulus, aortic root at the sinus of Valsalva, sinotubular junction and ascending aorta by echocardiography, and adjusted for body surface area (BSA). The mean value of flow-mediated dilation was 6.5 ± 2.4 %. Flow-mediated dilation had a negative correlation with the diameter of the ascending thoracic aorta (AscAd)/BSA (R = -0.39, p = 0.020) and multivariate analysis revealed that flow-mediated dilation was an independent factor predicting AscAd/BSA, whereas other segments of the aorta had no association. Furthermore, Brinkman index had a somewhat greater influence on flow-mediated dilation (R = -0.42, p = 0.008). Although subjects who smoked tended to have a larger AscAd compared with non-smokers (AscA/BSA: 17.3 ± 1.8 versus 15.2 ± 3.0 mm/m(2), p = 0.013), there was no significant change in flow-mediated dilation, suggesting that smoking might affect aortic dilation via an independent pathway. Common atherogenic risks, such as impairment of flow-mediated dilation and smoking status, affected aortic dilation in subjects with Marfan syndrome.

  20. [Coronary angioplasty: efficacy of the new low profile balloon catheters].

    Science.gov (United States)

    Feres, F; Tanajura, L F; Pinto, I M; Cano, M N; Maldonado, G; Mattos, L A; de Araújo, E C; Sousa, A G; Sousa, J E

    1989-12-01

    New low profile balloon catheter have allowed the indication of percutaneous transluminal coronary angioplasty (PTCA) for more complex lesions. We report our initial experience with these systems in 50 out of 101 patients (50%) who underwent a PTCA from March 15 to May 15, 1989 in "Instituto Dante Pazzanese de Cardiologia". Mean age was 58.6 +/- 10.4 years and most of the patients were male (78%). We dilated 54 lesions. Single vessel disease was the case for 84% of the patients. As for the localization of the lesions in the coronary arteries, 56% of the lesions were in the proximal or mid segments of the coronary arteries and the mean diameter stenosis pre-PTCA was 84 +/- 10.2%. Left ventricular function was normal in 60% of the patients. Primary success rate (per patient) was 95% and the coronary stenosis was crossed in all the cases. The mean inflation number was 2.7 +/- 0.6 per patient, the mean highest pressure was 8 +/- 1.15 atm and the mean maximum time of inflation was 86.1 +/- 29.6 sec. The mean residual stenosis was 15.2 +/- 10.6%. There was only one major complication, namely an acute myocardial infarction of the lateral wall. There were no emergency CABG surgery or deaths. We conclude that the new low profile balloon catheters have broadened the indication for PTCA in more complicated lesions, showing a high rate of primary success (95%), but did not increase the number of procedural complications (2.5%).

  1. Trajectory Control For High Altitude Balloons

    Science.gov (United States)

    Aaron, K.; Nock, K.; Heun, M.; Wyszkowski, C.

    We will discuss the continuing development of the StratoSailTM Balloon Trajectory Control System presented at the 33rd COSPAR in 2000. A vertical wing suspended on a 15-km tether from a high altitude balloon uses the difference in wind velocity between the altitude of the balloon and the altitude of the wing to create an aerodynamic sideforce. This sideforce, transmitted to the balloon gondola via the tether, causes the balloon to move laterally. Although the balloon's resultant drift velocity is quite small (a few meters per second), the effect becomes significant over long periods of time (hours to days). Recently, a full-scale wing, rudder and boom assembly has been fabricated, a winch system testbed has been completed, and a lightweight tether with reduced susceptibility to ultraviolet damage has been developed. The development effort for this invention, with pending international patents, has been funded by the NASA/SBIR program in support of the Ultra Long Duration Balloon (ULDB) program.

  2. 14 CFR 61.115 - Balloon rating: Limitations.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 2 2010-01-01 2010-01-01 false Balloon rating: Limitations. 61.115 Section... rating: Limitations. (a) If a person who applies for a private pilot certificate with a balloon rating... operate a gas balloon. (b) If a person who applies for a private pilot certificate with a balloon rating...

  3. Accurate Determination of the Volume of an Irregular Helium Balloon

    Science.gov (United States)

    Blumenthal, Jack; Bradvica, Rafaela; Karl, Katherine

    2013-01-01

    In a recent paper, Zable described an experiment with a near-spherical balloon filled with impure helium. Measuring the temperature and the pressure inside and outside the balloon, the lift of the balloon, and the mass of the balloon materials, he described how to use the ideal gas laws and Archimedes' principal to compute the average molecular…

  4. Abdominal cavity balloon for preventing a patient's bleeding

    NARCIS (Netherlands)

    Naber, E.E.H.; Rutten, H.J.T.; Jakimowicz, J.J.; Goossens, R.H.M.; Moes, C.C.M.; Buzink, S.N.

    2007-01-01

    The invention relates to an abdominal cavity balloon for preventing a haemorrhage in a patient's pelvic region, comprising an inflatable balloon, wherein the balloon is pro vided with a smooth surface and with a strip that is flex- urally stiff and formed to follow the balloon's shape for po

  5. Remodeling of the aortic neck with a balloon-expandable stent graft in patients with complicated neck morphology.

    Science.gov (United States)

    Kolvenbach, Ralf; Pinter, Laslo; Cagiannos, Catherine; Veith, Frank J

    2008-01-01

    Graft migration and other device-related problems are more frequent in abdominal aortic aneurysm (AAA) patients with a complicated neck. We wanted to evaluate the performance of a balloon-expandable stent graft in these cases. Complicated aortic neck morphology was defined as a combination of short (45 degrees) necks with or without circumferential thrombus. Severe aortic angulation was defined as less than 120 degrees. During a 24-month period, 18 consecutive patients with complicated neck anatomy were treated with the Vascular Innovations (VI)-Datascope balloon-expandable endograft. In two patients, a balloon-expandable cuff was implanted to remodel the neck prior to insertion of a bifurcated endograft (Excluder, W.L. Gore & Associates, Flagstaff, AZ). Demographic, procedural, and outcome data were collected prospectively and retrospectively analyzed. All patients had preoperative computed tomographic (CT) angiography to determine aortic neck angulation and were followed with duplex ultrasonography and CT every 3 and 6 months postoperatively to assess aortic neck and sac dilatation, as well as device migration. The VI-Datascope graft consists of an aortounifemoral polytetrafluoroethylene (PTFE) graft sutured to a proximal balloon-expandable stent. The length of the graft is 40 cm; thus, the distal end of the graft always protrudes through the ipsilateral arteriotomy and can be cut to an appropriate length for each patient. The covered portion of the graft was deployed just below the level of the lowest renal artery. The proximal bare metal stent was deployed in the suprarenal area. An endoluminal hand-sewn anastomosis was performed between the aortounifemoral limb and the distal external iliac or the common femoral arteries. An occluder device was placed in the contralateral common iliac artery to prevent retrograde perfusion of the aneurysm. A femorofemoral 8 mm Dacron graft bypass was then performed to establish flow to the contralateral extremity and pelvis

  6. Looners: Inside the world of balloon fetishism

    OpenAIRE

    McIntyre, Karen E

    2011-01-01

    In the spring of 1997, Shaun had just broken up with a boyfriend, and his roommate had moved out. Living alone for the first time and relieved of the fear that someone might walk in the door, he was finally able to indulge his fantasy. The young man sat on his couch and started blowing up balloons. Shaun had loved playing with balloons since he was a child. When he hit puberty, he felt his first orgasm rubbing against a balloon. It was then that his relationship with the object took ...

  7. A comparative study of internally and externally capped balloons using small scale test balloons

    Science.gov (United States)

    Bell, Douglas P.

    1994-01-01

    Caps have been used to structurally reinforce scientific research balloons since the late 1950's. The scientific research balloons used by the National Aeronautics and Space Administration (NASA) use internal caps. A NASA cap placement specification does not exist since no empirical information exisits concerning cap placement. To develop a cap placement specification, NASA has completed two in-hangar inflation tests comparing the structural contributions of internal caps and external caps. The tests used small scale test balloons designed to develop the highest possible stresses within the constraints of the hangar and balloon materials. An externally capped test balloon and an internally capped test balloon were designed, built, inflated and simulated to determine the structural contributions and benefits of each. The results of the tests and simulations are presented.

  8. The Effect of Listening to Music During Percutaneous Nephrostomy Tube Placement on Pain, Anxiety, and Success Rate of Procedure: A Randomized Prospective Study.

    Science.gov (United States)

    Hamidi, Nurullah; Ozturk, Erdem

    2017-05-01

    To evaluate the effect of listening to music on pain, anxiety, and success of procedure during office-based percutaneous nephrostomy tube placement (PNTP). One hundred consecutive patients (age >18 years) with hydronephrosis were prospectively enrolled in this study. All patients were prospectively randomized to undergo office-based PNTP with (Group I, n = 50) or without music (Group II, n = 50). Anxiety levels were evaluated with State Trait Anxiety Inventory. A visual analog scale was used to evaluate pain levels, patient's satisfaction, and willingness to undergo the procedure. We also compared success rates of procedures. The mean age, duration of procedure, and gender distribution were statistically similar between the two groups. The mean postprocedural heart rates and systolic blood pressures in Group I patients were significantly lower than Group II patients (p = 0.01 and p = 0.028, respectively), whereas preprocedural pulse rate and systolic blood pressure were similar. The mean anxiety level and mean pain score of Group I were significantly lower than those of Group II (p = 0.008 and p music during office-based PNTP decreases anxiety or pain and increases success rate of procedure. As an alternative to sedation or general anesthesia, music is easily accessible without side effect and cost.

  9. Improved Model of Rock Mass Dilatation.

    Science.gov (United States)

    1985-05-29

    uartzite ( Bieniawski , 1967), granite (Brace et al., 1966; Zoback and Byerlee, 1975), .-- marble, sandstone, limestone, etc. Dilatancy therefore appears...prepared for Defense Nuclear Agency. 2. Algorithm 392 of CACM, "Systems of Hyperbolic Partial Differential Equations." 3. Bieniawski , Z.T. (1967

  10. Dilation and Curettage (D&C)

    Science.gov (United States)

    ... Dilation and Curettage (D&C) Page Navigation ▼ ACOG Pregnancy Book Patient Education FAQs Patient Education Pamphlets - Spanish FAQ062, February 2016 ... written permission from the publisher. Related FAQs Early Pregnancy Loss (Miscarriage) (FAQ090) Abnormal Uterine Bleeding ... Committee Opinions Practice Bulletins Patient ...

  11. Ventricular dilatation in aging and dementia

    NARCIS (Netherlands)

    Palm, Walter Miguel

    2015-01-01

    The general objective of this thesis was to study the causes and consequences of ventricular dilatation in aging and dementia. For this purpose, we used ventricular shape analysis to study potential new MRI markers of cognitive decline in aging, subjective memory complaints, mild cognitive

  12. A Symmetry Approach to Time Dilation.

    Science.gov (United States)

    Dunne, Peter

    1995-01-01

    Outlines an approach to introduce students to special relativity using a discussion of stopclocks and measurement of the transmission of light pulses to produce a natural derivation of the time dilation factor. Aims at providing a frame of reference from which they can be tempted to explore special relativity at a more sophisticated level. (JRH)

  13. Hydraulic urethral dilatation after optical internal urethrotomy ...

    African Journals Online (AJOL)

    Objectives: To determine the rate of early recurrence of urethral stricture in the first six months in patients who perform hydraulic urethral dilatation(HUD) after optical internal urethrotomy (OIU) and compare the early recurrence Fate in patients who perform HUD after OIU with the recurrence rates in patients reported in the ...

  14. Intestinal Infarctus following Dilatation and Uterine Curettage

    Directory of Open Access Journals (Sweden)

    N.M. Ngowe

    2007-03-01

    Full Text Available We present a case of intestinal infarctus through the vagina. This was a consequence of induced abortion done clandestinely. The main objective was to point out the surgical complications of uterine dilatation and curettage by means of this rare case.

  15. Apparent unambiguousness of relativistic time dilation

    International Nuclear Information System (INIS)

    Strel'tsov, V.N.

    1992-01-01

    It is indicated on the definite analogy between the dependence of visible sizes of relativistic objects and period of the wave, emitted by the moving source from the observation conditions ('retradition factor'). It is noted that the definition of time for moving extended objects, led to relativistic dilation, corresponds to the definition of the relativistic (radar) length led to the 'elongation formula'. 10 refs

  16. Clinical experience of cerebral protection with balloon occlusion during carotid artery stenting

    International Nuclear Information System (INIS)

    Jaeger, H.J.; Mathias, K.D.; Drescher, R.; Bockisch, G.; Hauth, E.; Demirel, E.; Gissler, H.M.; Witten/Herdecke Univ.

    2001-01-01

    Purpose: To asses the technical feasibility and the results of cerebral protection with the GuardWire Plus Temporary Occlusion and Aspiration System during carotid artery stenting for high-grade stenosis. Patients and Methods: In 20 patients 20 carotid artery stenoses were treated with stent placement under cerebral protection. A contralateral carotid occlusion was an exclusion criteria for the use of the protection device. In all cases only aspiration, but no flushing was used before deflation of the occlusion balloon. In 17 of 20 patients diffusion-weighted (DW-)MRT imaging of the brain was performed before and 24 hours after the procedure. Results: The stent implantation was successfully performed in all patients. In 3 patients neurologic symptoms occurred during the occlusion time. In these 3 patients the symptoms immediately disappeared after deflation of the balloon. In one case there was dilatation of the internal carotid artery at the site of the balloon inflation. In 3 of the 17 DW-MR images new ipsilateral cerebral lesions, in one case a new contralateral lesion occurred after the procedure. Conclusions: The cerebral protection procedure is technically feasible. The occlusion of the internal carotid artery was not tolerated by all patients. The DW-MR imaging demonstrated cerebral lesions indicating the occurrence of cerebral microemboli during the procedure. Further investigations are necessary to determine if the use of the cerebral protection device will improve the results of the carotid artery stenting for high-grade stenoses. (orig.) [de

  17. Recent Developments in Balloon Support Instrumentation at TIFR Balloon Facility, Hyderabad.

    Science.gov (United States)

    Vasudevan, Rajagopalan

    2012-07-01

    The Balloon Facility of Tata Institute of Fundamental Research has been conducting stratospheric balloon flights regularly for various experiments in Space Astronomy and Atmospheric Sciences. A continuous improvement in Balloon flight Support instrumentation by the Control Instrumentation Group to keep in space with the growing complexities of the scientific payloads have contributed to the total success of balloon flights conducted recently. Recent improvements in display of Balloon position during balloon flight by showing on real time the balloon GPS position against Google TM maps is of immense help in selecting the right spot for payload landing and safe recovery . For further speeding up the payload recovery process, a new GPS-GSM payload system has been developed which gives SMS of the payload position information to the recovery team on their cell phones. On parallel footing, a new GPS- VHF system has been developed using GPS and Radio Modems for Balloon Tracking and also for obtaining the payload impact point. On the Telecommand side, a single board Telecommand/ Timer weighing less than 2 Kg has been specially developed for use in the mesosphere balloon test flight. The interference on the existing Short Range Telemetry System has been eliminated by introducing a Band Pass Filter and LNA in the Receiving system of the modules, thereby enhancing its reliability. In this paper , we present the details of the above mentioned developments.

  18. Deployment Instabilities of Lobed-Pumpkin Balloon

    Science.gov (United States)

    Nakashino, Kyoichi

    A lobed-pumpkin balloon, currently being developed in ISAS/JAXA as well as in NASA, is a promising vehicle for long duration scientific observations in the stratosphere. Recent ground and flight experiments, however, have revealed that the balloon has deployment instabilities under certain conditions. In order to overcome the instability problems, a next generation SPB called 'tawara' type balloon has been proposed, in which an additional cylindrical part is appended to the standard lobed-pumpkin balloon. The present study investigates the deployment stability of tawara type SPB in comparison to that of standard lobed-pumpkin SPB through eigenvalue analysis on the basis of finite element methods. Our numerical results show that tawara type SPB enjoys excellent deployment performance over the standard lobed-pumpkin SPBs.

  19. Magnetometer for Balloons and UAVs Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This Phase I SBIR project will investigate a new, low-cost approach to atomic magnetometry that is suited for operation from UAVs and research balloons. Atomic...

  20. Solid State Inflation Balloon Active Deorbiter

    Data.gov (United States)

    National Aeronautics and Space Administration — The Solid State Inflation Balloon (SSIB) is a simple, reliable, low-cost, non-propulsive system for deliberate deorbit and control of downrange point-of-impact that...

  1. Shielded Mars Balloon Launcher (SMBL) Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Aurora Flight Sciences, along with its partner Vertigo Industries, proposes a novel approach to deployment of balloon-based payloads into the Martian atmosphere....

  2. Two-in-one aortic valve sizing and valvuloplasty conductance balloon catheter.

    Science.gov (United States)

    Svendsen, Mark C; Sinha, Anjan K; Berwick, Zachary C; Combs, William; Teague, Shawn D; Lefevre, Thierry; Babaliaros, Vasilis; Kassab, Ghassan

    2015-07-01

    Inaccurate aortic valve sizing and selection is linked to paravalvular leakage in transcatheter aortic valve replacement (TAVR). Here, a novel sizing valvuloplasty conductance balloon (SVCB) catheter is shown to be accurate, reproducible, unbiased, and provides real-time tool for aortic valve sizing that fits within the standard valvuloplasty procedure. The SVCB catheter is a valvuloplasty device that uses real-time electrical conductance measurements based on Ohm's Law to size the balloon opposed against the aortic valve at any given inflation pressure. Accuracy and repeatability of the SVCB catheter was performed on the bench in phantoms of known dimension and ex vivo in three domestic swine aortic annuli with comparison to computed tomography (CT) and dilator measurements. Procedural workflow and safety was demonstrated in vivo in three additional domestic swine. SVCB catheter measurements had negligible bias or error for bench accuracy considered as the gold standard (Bias: -0.11 ± 0.26 mm; Error: 1.2%), but greater disagreement in ex vivo versus dilators (Bias: -0.3 ± 1.1 mm; Error: 4.5%), and ex vivo versus CT (Bias: -1.0 ± 1.6 mm; Error: 8.7%). The dilator versus CT accuracy showed similar agreement (Bias: -0.9 ± 1.5 mm; Error: 7.3%). Repeatability was excellent on the bench (Bias: 0.02 ± 0.12 mm; Error: 0.5%) and ex vivo (Bias: -0.4 ± 0.9 mm; Error: 4.6%). In animal studies, the device fit well within the procedural workflow with no adverse events or complications. Due to the clinical relevance of this accurate, repeatable, unbiased, and real-time sizing measurement, the SVCB catheter may provide a useful tool prior to TAVR. These findings merit a future human study. © 2015 Wiley Periodicals, Inc.

  3. Test ventilation with smoke, bubbles, and balloons

    International Nuclear Information System (INIS)

    Pickering, P.L.; Cucchiara, A.L.; McAtee, J.L.; Gonzales, M.

    1987-01-01

    The behavior of smoke, bubbles, and helium-filled balloons was videotaped to demonstrate the mixing of air in the plutonium chemistry laboratories, a plutonium facility. The air-distribution patterns, as indicated by each method, were compared. Helium-filled balloons proved more useful than bubbles or smoke in the visualization of airflow patterns. The replay of various segments of the videotape proved useful in evaluating the different techniques and in identifying airflow trends responsible for air mixing. 6 refs

  4. Gondola development for CNES stratospheric balloons

    Science.gov (United States)

    Vargas, A.; Audoubert, J.; Cau, M.; Evrard, J.; Verdier, N.

    The CNES has been supporting scientific ballooning since its establishment in 1962. The two main parts of the balloon system or aerostat are the balloon itself and the flight train, comprising the house-keeping gondola, for the control of balloon flight (localization and operational telemetry & telecommand - TM/TC), and the scientific gondola with its dedicated telecommunication system. For zero pressure balloon, the development of new TM/TC system for the housekeeping and science data transmission are going on from 1999. The main concepts are : - for balloon house-keeping and low rate scientific telemetry, the ELITE system, which is based on single I2C bus standardizing communication between the different components of the system : trajectography, balloon control, power supply, scientific TM/TC, .... In this concept, Radio Frequency links are developed between the house keeping gondola and the components of the aerostat (balloon valve, ballast machine, balloon gas temperature measurements, ...). The main objectives are to simplify the flight train preparation in term of gondola testing before flight, and also by reducing the number of long electrical cables integrated in the balloon and the flight train; - for high rate scientific telemetry, the use of functional interconnection Internet Protocol (IP) in interface with the Radio Frequency link. The main idea is to use off-the-shelf IP hardware products (routers, industrial PC, ...) and IP software (Telnet, FTP, Web-HTTP, ...) to reduce the development costs; - for safety increase, the adding, in the flight train, of a totally independent house keeping gondola based on the satellite Inmarsat M and Iridium telecommunication systems, which permits to get real time communications between the on-board data mobile and the ground station, reduced to a PC computer with modem connected to the phone network. These GEO and LEO telecommunication systems give also the capability to operate balloon flights over longer distance

  5. Hydrocephalus due to extreme dilation of Virchow-Robin spaces

    Science.gov (United States)

    Revel, Frederic; Cotton, Francois; Haine, Max; Gilbert, Thomas

    2015-01-01

    Virchow-Robin spaces (VRS) are extensions of the subarachnoid space surrounding perforating blood vessels entering the brain parenchyma. VRS are fluid filled, but almost virtual and only visible on MRI of the brain when dilated. Such dilations are commonly asymptomatic. In rare cases, extreme dilations can be observed; the clinical repercussions of which remain unclear. We report the case of a patient presenting symptoms of normal pressure hydrocephalus due to extreme VRS mesencephalon dilations. PMID:25564639

  6. Cosmic time dilation: The clock paradox revisited

    International Nuclear Information System (INIS)

    Tomaschitz, Roman

    2004-01-01

    The relativistic time dilation is reviewed in a cosmological context. We show that a clock or twin paradox does not arise if cosmic time is properly taken into account. The receding galaxy background provides a unique frame of reference, and the proper times of geodesic as well as accelerated observers can be linked to the universal cosmic time parameter. This suggests to compare the proper time differentials of the respective observers by determining their state of motion in the galaxy grid. In this way, each observer can figure out whether his proper time is dilated or contracted relative to any other. In particular one can come to unambiguous conclusions on the aging of uniformly moving observers, without reference to asymmetries in measurement procedures or accelerations they may have undergone

  7. Cosmological Time Dilation in Gamma Ray Bursts?

    OpenAIRE

    Band, David

    1994-01-01

    Norris et al. (1994) report that the temporal structure of faint gamma ray bursts is longer than that of bright bursts, as expected for time dilation in the cosmological models of burst origin. I show that the observed trends can easily be produced by a burst luminosity function and thus may not result from cosmological effects. A cosmological signature may be present, but the tests Norris et al. present are not powerful enough to detect these signatures.

  8. The Naimark dilated PT-symmetric brachistochrone

    OpenAIRE

    Guenther, Uwe; Samsonov, Boris F.

    2008-01-01

    The quantum mechanical brachistochrone system with PT-symmetric Hamiltonian is Naimark dilated and reinterpreted as subsystem of a Hermitian system in a higher-dimensional Hilbert space. This opens a way to a direct experimental implementation of the recently hypothesized PT-symmetric ultra-fast brachistochrone regime of [C. M. Bender et al, Phys. Rev. Lett. {\\bf 98}, 040403 (2007)] in an entangled two-spin system.

  9. Naimark-Dilated PT-Symmetric Brachistochrone

    Science.gov (United States)

    Günther, Uwe; Samsonov, Boris F.

    2008-12-01

    The quantum mechanical brachistochrone system with a PT-symmetric Hamiltonian is Naimark-dilated and reinterpreted as a subsystem of a Hermitian system in a higher-dimensional Hilbert space. This opens a way to a direct experimental implementation of the recently hypothesized PT-symmetric ultrafast brachistochrone regime of Bender et al. [Phys. Rev. Lett. 98, 040403 (2007)PRLTAO0031-900710.1103/PhysRevLett.98.040403] in an entangled two-spin system.

  10. Stability of wavelet frames with matrix dilations

    DEFF Research Database (Denmark)

    Christensen, Ole; Sun, Wenchang

    2006-01-01

    Under certain assumptions we show that a wavelet frame {Tau(A(j), b(j,k))psi} (j,k is an element of Z) := {vertical bar detA(j)vertical bar(-1/2) psi(A(j)(-1)(x - b(j,k)))} (j,k is an element of Z) in L-2(R-d) remains a frame when the dilation matrices A(j) and the translation parameters b...

  11. CT in thrombosed dilated posterior epidural vein

    Energy Technology Data Exchange (ETDEWEB)

    Bammatter, S.; Schnyder, P.; Preux, J. de

    1987-05-01

    The authors report a case of thrombosis of the distal end of an enlarged right posterior epidural vein. The patient had a markedly narrow lumbar canal due to L5 spondylolisthesis. The dilated vein and the thrombosis were displayed by computed tomography but remained unrecognized until surgery. Pathogenesis of this condition is discussed. A review of the English, French and German literature revealed no prior radiological reports of a similar condition.

  12. Dilational surface rheology of polymer solutions

    International Nuclear Information System (INIS)

    Noskov, B A; Bykov, A G

    2015-01-01

    The review concerns main achievements in dilational rheology of polymer adsorption films at the gas/liquid interfaces reported in the last fifteen years. The theoretical foundations of methods of surface rheology and the key results obtained in studies of solutions of amphiphilic nonionic polymers, polyelectrolytes, proteins and their complexes with low-molecular-mass surfactants are discussed. Interest in the surface dilational rheology is mainly caused by a small number of available experimental methods for investigation of the surface of liquids, by the fact that traditional methods of measurement of the surface tension that are widely used in studies of solutions of low-molecular-mass surfactants provide little information when applied to polymer solutions owing to very slow establishment of equilibrium as well as by weak dependence of the surface tension on the polymer concentration. Progress in the surface rheology is driven by the recent studies of the stability of foams and emulsions that demonstrated a key role of the dilational surface rheological properties in the dynamics of liquid-phase disperse systems. The bibliography includes 191 references

  13. Time dilation in quantum systems and decoherence

    Science.gov (United States)

    Pikovski, Igor; Zych, Magdalena; Costa, Fabio; Brukner, Časlav

    2017-02-01

    Both quantum mechanics and general relativity are based on principles that defy our daily intuitions, such as time dilation, quantum interference and entanglement. Because the regimes where the two theories are typically tested are widely separated, their foundational principles are rarely jointly studied. Recent works have found that novel phenomena appear for quantum particles with an internal structure in the presence of time dilation, which can take place at low energies and in weak gravitational fields. Here we briefly review the effects of time dilation on quantum interference and generalize the results to a variety of systems. In addition, we provide an extended study of the basic principles of quantum theory and relativity that are of relevance for the effects and also address several questions that have been raised, such as the description in different reference frames, the role of the equivalence principle and the effective irreversibility of the decoherence. The manuscript clarifies some of the counterintuitive aspects arising when quantum phenomena and general relativistic effects are jointly considered.

  14. Time dilation in quantum systems and decoherence

    International Nuclear Information System (INIS)

    Pikovski, Igor; Zych, Magdalena; Costa, Fabio; Brukner, Časlav

    2017-01-01

    Both quantum mechanics and general relativity are based on principles that defy our daily intuitions, such as time dilation, quantum interference and entanglement. Because the regimes where the two theories are typically tested are widely separated, their foundational principles are rarely jointly studied. Recent works have found that novel phenomena appear for quantum particles with an internal structure in the presence of time dilation, which can take place at low energies and in weak gravitational fields. Here we briefly review the effects of time dilation on quantum interference and generalize the results to a variety of systems. In addition, we provide an extended study of the basic principles of quantum theory and relativity that are of relevance for the effects and also address several questions that have been raised, such as the description in different reference frames, the role of the equivalence principle and the effective irreversibility of the decoherence. The manuscript clarifies some of the counterintuitive aspects arising when quantum phenomena and general relativistic effects are jointly considered. (paper)

  15. Coronary dilation with nitrocompounds and calcium antagonists.

    Science.gov (United States)

    Jost, S; Rafflenbeul, W; Lichtlen, P R

    1990-01-01

    The vasodilatory effects of nitrocompounds and calcium antagonists on epicardial coronary arteries represent substantial antianginal mechanisms in the presence of coronary vasospasm or eccentric coronary stenoses. With high doses of nitrocompounds, angiographically normal coronary segments can be dilated by an average of approx. 30%, some coronary stenoses even by up to 100%, usually without severe reduction of blood pressure. With calcium antagonists, a similar extent of dilation of normal coronary arteries and eccentric stenoses can be obtained. Our own group demonstrated an average dilation of normal coronary arteries of about 20% after intravenous administration of dihydropyridine calcium antagonists; however, the average systolic blood pressure dropped below 100 mmHg after these compounds. Hence, although in isolated human coronary arteries high concentrations of calcium antagonists were shown to induce a considerably greater vasodilation than nitrocompounds, the early drop in blood pressure prohibits a higher dosage of calcium antagonists in vivo. In the presence of coronary artery disease, particularly when associated with coronary vasospasm, a combination of the two groups of compounds might be recommendable, since an addition of the effects of coronary vasomotor tone is likely. Furthermore, the antianginal effects of a reduction of preload and afterload are complementary.

  16. Long-Term Percutaneous Nephrostomy Management of Malignant Urinary Obstruction: Estimation of Optimal Exchange Frequency and Estimation of the Financial Impact of Patient Compliance.

    Science.gov (United States)

    McDevitt, Joseph L; Acosta-Torres, Stefany; Zhang, Ning; Hu, Tianshen; Odu, Ayobami; Wang, Jijia; Xi, Yin; Lamus, Daniel; Miller, David S; Pillai, Anil K

    2017-07-01

    To estimate the least costly routine exchange frequency for percutaneous nephrostomies (PCNs) placed for malignant urinary obstruction, as measured by annual hospital charges, and to estimate the financial impact of patient compliance. Patients with PCNs placed for malignant urinary obstruction were studied from 2011 to 2013. Exchanges were classified as routine or due to 1 of 3 complication types: mechanical (tube dislodgment), obstruction, or infection. Representative cases were identified, and median representative charges were used as inputs for the model. Accelerated failure time and Markov chain Monte Carlo models were used to estimate distribution of exchange types and annual hospital charges under different routine exchange frequency and compliance scenarios. Long-term PCN management was required in 57 patients, with 87 total exchange encounters. Median representative hospital charges for pyelonephritis and obstruction were 11.8 and 9.3 times greater, respectively, than a routine exchange. The projected proportion of routine exchanges increased and the projected proportion of infection-related exchanges decreased when moving from a 90-day exchange with 50% compliance to a 60-day exchange with 75% compliance, and this was associated with a projected reduction in annual charges. Projected cost reductions resulting from increased compliance were generally greater than reductions resulting from changes in exchange frequency. This simulation model suggests that the optimal routine exchange interval for PCN exchange in patients with malignant urinary obstruction is approximately 60 days and that the degree of reduction in charges likely depends more on patient compliance than exact exchange interval. Copyright © 2017 SIR. Published by Elsevier Inc. All rights reserved.

  17. Advanced Onboard Energy Storage Solution for Balloons, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — Advanced Balloon Programs at NASA are looking for a potential 100 day missions at mid-altitudes. These balloons would be powered by solar panels to take advantage of...

  18. Crash in Australian outback ends NASA ballooning season

    Science.gov (United States)

    Harris, Margaret

    2010-06-01

    NASA has temporarily suspended all its scientific balloon launches after the balloon-borne Nuclear Compton Tele scope (NCT) crashed during take-off, scattering a trail of debris across the remote launch site and overturning a nearby parked car.

  19. Spectrum of ballooning instabilities in a stellarator

    International Nuclear Information System (INIS)

    Cooper, W.A.; Singleton, D.B.; Dewar, R.L.

    1995-08-01

    The recent revival of interest in the application of the 'ballooning formalism' to low-frequency plasma instabilities has prompted a comparison of the Wentzel-Brillouin-Kramers (WKB) ballooning approximation with an (in principle) exact normal mode calculation for a three-dimensional plasma equilibrium. Semiclassical quantization, using the ideal magnetohydrodynamic (MHD) ballooning eigenvalue to provide a local dispersion relation, is applied to a ten-field period stellarator test case. Excellent qualitative agreement, and good quantitative agreement is found with predictions from the TERPSICHORE code for toroidal mode numbers from 1 to 14 and radial mode numbers from 0 to 2. The continuum bands predicted from three-dimensional WKB theory are too narrow to resolve. (author) 3 figs., 24 refs

  20. [Intraaortic balloon pumping( IABP) in Japan].

    Science.gov (United States)

    Ono, Tomoyuki; Tanoue, Yoshihisa; Tominaga, Ryuji

    2014-07-01

    The intraaortic balloon pumping (IABP) is the most widely used circulatory assist device. IABP increases coronary perfusion in diastolic phase by the inflation of the balloon in the descending aorta (diastolic augmentation) and reduces afterload in systolic phase by the deflation of the balloon( systolic unloading). IABP improves the hemodynamic condition of patients who fall into acute heart failure and/or cardiogenic shock. Six-type IABP system can be used in Japan. The IABP-SHOCK II trial shows that there is no significant difference in mortality between optimal medical treatment with IABP and without IABP in addition to early revascularization. Clinical backgrounds in Japan are different from those in IABP-SHOCK II trial, and the further prospective studies of IABP in Japan thus called for.

  1. Balloon Eustachian Tuboplasty in children.

    Science.gov (United States)

    Leichtle, A; Hollfelder, D; Wollenberg, B; Bruchhage, K-L

    2017-06-01

    Endonasal ballon dilatation of the Eustachian tube (BET) is a promising treatment for Eustachian tube dysfunction with encouraging results over the last years in adults. In addition, in children, single studies demonstrated promising results, but revealed the necessity for broader and additional studies. Our retrospective analysis presents outcomes with BET in children with chronic obstructive dysfunction of the Eustachian tube, showing resistance to the conventional therapy after adenotomy with paracentesis or grommets (ventilation tubes). The data of 52 children, having undergone BET from April 2011 to April 2016, were retrospectively evaluated. Most children in our study presented middle ear effusion (47%), adhesive (21%), chronic otitis media (13%), or recurrent acute otitis media (11%). In 24 (37%) children, we combined BET with a paracentesis, in 5 (8%) patients with a tympanoplasty type I and in 3 (5%) patients with a type III. All children were assessed using an audiogram, tympanometry, and tubomanometry (50 mbar) before and after BET. In addition, we evaluated the results of the Lübecker questionnaire, which we performed before and after BET. The childrens' ear-related and quality of life-related symptoms, such as pressure equalization, ear pressure, hearing loss, pain and limitation in daily life, and satisfaction pre- and postoperatively, were analyzed. In the majority of patients, we could see an improvement in the ear pressure, hearing loss, limitation in daily life, and satisfaction with recurrent inflammations, underlined by better outcomes in the tubomanometry and the tympanogram. BET in children is a safe, efficient, and promising method to treat chronic tube dysfunction, especially as a second line treatment, when adenotomy, paracentesis, or grommets failed before.

  2. Performance of the EUSO-Balloon electronics

    International Nuclear Information System (INIS)

    Barrillon, P.; Dagoret, S.; Miyamoto, H.; Moretto, C.; Bacholle, S.; Blaksley, C; Gorodetzky, P.; Jung, A.; Prévôt, G.; Prat, P.; Bayer, J.; Blin, S.; Taille, C. De La; Cafagna, F.; Fornaro, C.; Karczmarczyk, J.; Tanco, G. Medina; Osteria, G.; Perfetto, F.; Park, I.

    2016-01-01

    The 24th of August 2014, the EUSO-Balloon instrument went for a night flight for several hours, 40 km above Timmins (Canada) balloon launching site, concretizing the hard work of an important part of the JEM-EUSO collaboration started 3 years before. This instrument consists of a telescope made of two lenses and a complex electronic chain divided in two main sub-systems: the PDM (Photo Detector Module) and the DP (Data Processor). Each of them is made of several innovative elements developed and tested in a short time. This paper presents their performances before and during the flight

  3. Exponential Growth of Nonlinear Ballooning Instability

    International Nuclear Information System (INIS)

    Zhu, P.; Hegna, C. C.; Sovinec, C. R.

    2009-01-01

    Recent ideal magnetohydrodynamic (MHD) theory predicts that a perturbation evolving from a linear ballooning instability will continue to grow exponentially in the intermediate nonlinear phase at the same linear growth rate. This prediction is confirmed in ideal MHD simulations. When the Lagrangian compression, a measure of the ballooning nonlinearity, becomes of the order of unity, the intermediate nonlinear phase is entered, during which the maximum plasma displacement amplitude as well as the total kinetic energy continues to grow exponentially at the rate of the corresponding linear phase.

  4. Ballooning behavior in the golden orbweb spider Nephilapilipes (Araneae: Nephilidae

    Directory of Open Access Journals (Sweden)

    Vanessa M.J. Lee

    2015-01-01

    Full Text Available Ballooning, a mode of aerial dispersal in spiders, is an innate behavior that requires appropriate physiological and meteorological conditions. Although only rarely reported in the golden orbweb spiders, family Nephilidae, the large geographic distributions of most nephilids—in particular of Nephila species—would imply that these spiders likely routinely disperse by ballooning in spite of giant female sizes. Here we study ballooning behavior in the golden orbweb spider Nephila pilipes (Fabricius, 1793. Specifically, we test for the propensity of spiderlings to deploy ballooning as a dispersal mechanism. We subjected a total of 59 first-instar spiderlings to a wind experiment at two wind speeds (2.17 ± 0.02 m s-1 and 3.17 ± 0.02 m s-1 under laboratory conditions. Under an average wind speed of 3.17 m s-1, none of the spiderlings exhibited pre-ballooning or ballooning behavior. However, at an average wind speed of 2.17 m s-1, 53 (89.8% spiderlings showed pre-ballooning behavior, and 17 (32.1% of the pre-ballooners ultimately ballooned. Our results concur with prior reports on spiderlings of other families that pre-ballooning behavior is a requirement for ballooning to occur. Furthermore, although we cannot rule out other dispersal mechanisms such as synanthropic spread, our findings suggest that the widespread N. pilipes uses ballooning to colonize remote oceanic islands.

  5. Outcomes of intragastric balloon placements in a private practice setting

    NARCIS (Netherlands)

    Mathus-Vliegen, Elisabeth M. H.; Alders, Peter R. H.; Chuttani, Ram; Scherpenisse, Joost

    2015-01-01

    Intragastric balloons are used as a treatment for obesity. Much of the data collected on balloons has been in the context of clinical trials in academic medical centers or as a bridge to bariatric surgery in obesity centers. The aim of this study was to investigate the efficacy and safety of balloon

  6. 21 CFR 884.5050 - Metreurynter-balloon abortion system.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Metreurynter-balloon abortion system. 884.5050... Devices § 884.5050 Metreurynter-balloon abortion system. (a) Identification. A metreurynter-balloon abortion system is a device used to induce abortion. The device is inserted into the uterine cavity...

  7. The neural substrates of subjective time dilation

    OpenAIRE

    Marc Wittmann; Marc Wittmann; Marc Wittmann; Virginie Van Wassenhove; Bud Craig; Martin P Paulus; Martin P Paulus

    2010-01-01

    An object moving towards an observer is subjectively perceived as longer in duration than the same object that is static or moving away. This 'time dilation effect' has been shown for a number of stimuli that differ from standard events along different feature dimensions (e.g. color, size, and dynamics). We performed an event-related functional magnetic resonance imaging (fMRI), while subjects viewed a stream of five visual events, all of which were static and of identical duration except the...

  8. The Neural Substrates of Subjective Time Dilation

    OpenAIRE

    Wittmann, Marc; van Wassenhove, Virginie; Craig, A. D. (Bud); Paulus, Martin P.

    2010-01-01

    An object moving towards an observer is subjectively perceived as longer in duration than the same object that is static or moving away. This ”time dilation effect” has been shown for a number of stimuli that differ from standard events along different feature dimensions (e.g. color, size, and dynamics). We performed an event-related functional magnetic resonance imaging (fMRI) study, while subjects viewed a stream of five visual events, all of which were static and of identical duration exce...

  9. Dilated cardiomyopathy following use of xenadrine EFX

    Science.gov (United States)

    Riccioni, Graziano; Speziale, Giuseppe; Scotti, Luca; Bucciarelli, Valentina; Cappetti, Silvia; Nasso, Giuseppe; Gallina, Sabina; Bucciarelli, Tonino

    2015-01-01

    We describe a case of a 35-year-old man presented at the emergency room of our institution with acute onset of dyspnea and dizziness. He was a body builder and had been using Xenadrine EFX for weight loss reduction. The laboratory analyses were normal. A chest radiograph showed an enlarged cardiac silhouette with clear lung fields. Transtoracic two-dimensional color Doppler echocardiography revealed a diffuse hypokinesia with a marked decreased in systolic function and a high teledyastolic diameter. This case document the possible relation to use of Xenadrine EFX for weight loss and the recurrence of dilated cardiomyopathy. PMID:26680256

  10. Balloon Angioplasty for Native Coarctation of the Aorta in Children: Immediate Outcome and Follow-up for Heart Function

    Directory of Open Access Journals (Sweden)

    Hamid Amoozgar

    2017-03-01

    Full Text Available Background: The effect of balloon angioplasty in treatment of coarctation of the aorta (COA in pediatric patients is very important. Objectives: This study aimed to assess the efficacy and safety of balloon angioplasty for coarctation of the aorta (CoA and its effects on heart function in children above 3 months of age. Patients and Methods: In this retrospective study, we reviewed the immediate outcomes of 100 consecutive pediatric patients above 3 months of age with native CoA who were treated by balloon angioplasty at a tertiary pediatric heart center from June 2002 to August 2012. The patients were followed by echocardiography. Statistical analyses were performed by descriptive statistics using the SPSS statistical software, version 20 and the significance level was set at 0.05. Results: The patients’ ages ranged from 4 months to 15 years, with the mean of 51.56 ± 42.22 months. Additionally, their body weight ranged from 4 to 63 kg (mean: 15.44 ± 10.62 kg at the time of CoA repair. Technical success of balloon dilation was achieved in 91/95 patients (95.7%. Besides, systolic gradient significantly reduced from 48.29 ± 21.62 mmHg (range 7 - 82 mmHg to 13.21 ± 9.96 mmHg (range 0 - 34 mmHg (P 15. Conclusions: Percutaneous balloon angioplasty was a safe and effective treatment option for native CoA in the children above 3 months old. However, impairment of LV diastolic function should be mentioned as an important issue in long-term follow-up.

  11. Fasting and meal-suppressed ghrelin levels before and after intragastric balloons and balloon-induced weight loss

    NARCIS (Netherlands)

    Mathus-Vliegen, E. M. H.; Eichenberger, R. I.

    2014-01-01

    Intragastric balloons may be an option for obese patients with weight loss failure. Its mode of action remains enigmatic. We hypothesised depressed fasting ghrelin concentrations and enhanced meal suppression of ghrelin secretion by the gastric fundus through balloon contact and balloon-induced

  12. Percutaneous Dilatational Tracheostomy via Griggs Technique.

    Science.gov (United States)

    Karimpour, Hasan Ali; Vafaii, Kamran; Chalechale, Maryam; Mohammadi, Saeed; Kaviannezhad, Rasool

    2017-01-01

    Tracheostomy is considered the airway management of choice for patients who need prolonged mechanical ventilation support. Percutaneous Dilatational Tracheotomy (PDT) is a technique that can be performed easily and rapidly at bedside and is particularly useful in the intensive care setting. The Griggs percutaneous tracheotomy is unique in its utilization of a guide wire dilator forceps. We aimed to describe the early perioperative and late postoperative complications of PDT using the Griggs technique in patients in the intensive care unit (ICU). This cross-sectional study was conducted on all patients who underwent tracheostomy in the ICU of the Imam Reza Hospital of Kermanshah, Iran, from June 2011 to June 2015. PDT was performed in 184 patients with the Griggs technique. Demographic variables, as well as perioperative and late postoperative complications were recorded. The mean age of patients was 57.3 ± 15.37 years. The most common primary causes of tracheostomy were hypoxic brain damage disorders (43.2%) and pneumonia (14.8%). Perioperative and early complications occurred in 16.7 % of procedures, of which 9.3% were bleedings (minor, significant and major). Furthermore, the incidence of late complications was 8.6%, including: stomal infection, difficult replace tracheostomy tube, tracheoesophageal fistula, tracheal stenosis, and tracheomalacia. PDT via Griggs technique is a safe, quick, and effective method. The low incidence of complications indicates that bedside percutaneous tracheostomy can be performed safely as a routine procedure for daily care implemented in the ICU.

  13. Gastric Dilation and Volvulus Syndrome in Dog

    Directory of Open Access Journals (Sweden)

    Ami S. Bhatia

    Full Text Available Gastric dilatation and volvulus syndrome (GDV in dogs is an abnormal accumulation of gastric gas (dilatation, which may be complicated by rotation of the stomach (volvulus about its mesentric axis. A number of factors, both environmental and host have been implicated in GDV. This syndrome has a variety of effects on the cardiovascular, respiratory, gastrointestinal, metabolic, haemolymphatic-immune, renal and central nervous systems. Clinical signs include distended, painful, tympanic abdomen, retching, unproductive vomiting, hypersalivation, respiratory distress accompanied by varying degrees of shock. Treatment of GDV includes medical and fluid therapy at shock dosages to initially stabilize the patient followed by gastric decompression. Surgical procedure comprises of gastric derotation followed by partial gastrectomy or spleenectomy depending upon gastric or spleenic viability and lastly, permanent right sided gastropexy. Post surgical considerations include frequent small meals instead of one large meal, avoiding vigorous activity immediately after meals and not allowing animal to gorge on water after meals or activities. [Veterinary World 2010; 3(12.000: 554-557

  14. Viscoresistive g-modes and ballooning

    International Nuclear Information System (INIS)

    Dagazian, R.Y.; Paris, R.B.

    1980-01-01

    The resistive G-mode and its particular form, the resistive ballooning mode, are treated as limits of a single simple model. MHD theory including parallel and perpendicular viscosity, finite shear, and finite beta is employed to study their linear stability

  15. Treatment of tuberculous bronchostenosis: balloon bronchoplasty

    International Nuclear Information System (INIS)

    Ahn, Joong Mo; Im, Jung Gi; Han, Joon Koo; Park, Jae Hyung

    1993-01-01

    The purpose of this study is to evaluate the efficacy of the balloon bronchoplasty in the treatment of the tuberculous bronchostenosis. Balloon bronchoplasty was performed in thirteen patients with stenosis of the left main bronchus (two with combined left upper and lower lobar bronchostenosis) using a inflatable balloon catheter under a fluoroscopic guide. We analysed the changes in the severity of dyspnea and wheezing, serial FEV1/FVC as a parameter of the airflow obstruction, and bronchial diameter and lung volume on chest radiographs. The extent of pulmonary tuberculosis was correlated with the improvement of FEV1/ FVC. There was an improvement of dyspnea in 69% (9/13), decrease of wheezing in 69% (9/13), significant increase of FEV1/FVC in 18% (2/11). The increase of the bronchial diameter and lung volume were seen in 84% (11/13) and 53% (7/13), respectively. The significant increase of FEV1/FVC was seen in 28% (2/7) of the patients with lung involvement of tuberculous less than one third of left upper lobe, whereas there was no increase in those of more than one third. The was no complication except transient leukocytosis, fever and blood-tinged sputum. In conclusion, balloon bronchoplasty is effective in the treatment of medically intractable tuberculous bronchostenosis, and can be considered as an initial method of treatment

  16. Low dose intravaginal misoprostol versus intracervical balloon ...

    African Journals Online (AJOL)

    Background:The efficacy and safety of low dose misoprostol as a ripening agent compared to the widely used balloon catheter in developing countries is undetermined. Objective:To compare the safety and efficacy of a low dose intravaginal misoprostol and intracervical Foley's catheter for cervical ripening. Design:A ...

  17. Double-balloon endoscopy: Who needs it?

    DEFF Research Database (Denmark)

    Hendel, J.W.; Vilmann, P.; Jensen, T.

    2008-01-01

    Objective. Double-balloon endoscopy (DBE) made the small bowel accessible to inspection and therapy in its entirety. However, DBE is a time-consuming procedure that requires a highly skilled endoscopist, several nurses and - more often than not - anesthesiological support. This makes the selection...

  18. Roentgenoendovascular dilatation and recanalization of vessels of lower extremities

    International Nuclear Information System (INIS)

    Rabkin, I.Kh.; Matevosov, A.L.; Gotman, L.N.

    1987-01-01

    Advantages and disadvantages of using roentgenoendovascular dilatation (RED) of vessels of lower extremities are presented. RED is recommended in treating patients with short segmented stenoses of common and external illiac arteries and also with the similar damages of surficial femoral arteries. Dilatation is a success when there is permeability in at least one of the three central crus arteries. Success of delayed results of vessel dilatation is to a certain degree in inverse proportion to time and length of occlusion

  19. Mechanical properties of ANTRIX balloon film and fabrication of single cap large volume balloons

    Science.gov (United States)

    Suneel Kumar, B.; Sreenivasan, S.; Subba Rao, J. V.; Manchanda, R. K.

    2008-11-01

    The zero pressure plastic balloons used for high altitude studies are generally made from polyethylene material. Tensile properties of the thin film polymer are the key parameters for material selection due to extremely low temperature of -90 °C encountered by the balloons in the tropopause region during the ascent at equatorial latitudes. The physical and structural properties of the material determine the uniformity of the stress distribution over the entire shell. Load stresses from the suspended load propagate via load tapes heat sealed along with the gore seals as per the balloon design. A balance between this heat seal strength and the film strength is a desirable property of the basic resin in terms of the bubble strength, gauge uniformity, and long-term storage properties. In addition, the design of the top shell of the balloon and its stress distribution play an important role since only a fraction of the balloon is deployed during the filling operation and the ascent. In this paper we describe the mechanical properties of the 'ANTRIX' film developed by us and the optimized design of single cap balloons, which have been successfully used in our experiments over the past 5 years.

  20. [Endometrial ablation with thermal balloon, experience in a private hospital].

    Science.gov (United States)

    Quesnel-García-Benítez, C; Sánchez-Aranda, A; López-Rioja, M J

    2016-04-01

    Traditionally, the treatment for menorrhagia includes pharmacological therapies (hormones and uterotonics) or surgical (dilatation/curettage and hysterectomy). Recently the FDA approved a non-invasive therapeutic option, known as endometrial ablation. Which it consists in a thermal balloon delivers (ThermaChoice y Thermablate EAS) which energy destroys the uterine lining, thus reducing the bleeding and even producing amenorrhea. And could offer other benefits such as reduction of the surgical time, and therefore: anesthesia time, postoperative complications and costs. Highlighting a greater patient satisfaction. Describe the demographic characteristics, outcomes and patient satisfaction, which were treated with endometrial ablation for menorrhagia. A descriptive, observational and retrospective study. During a period of 11 years (March 2012 to December 2013), in a private hospital, that includes 124 patients with menorrhagia, which were treated with endometrial ablation: 53 (43%) ThermaChoice y 71 (57%) Thermablate EAS. We used T Student and Fisher method to study the results. The 124 patients (100%) achieve all the criteria's of endometrial ablation according ACOG (American College of Obstetricians and Gynecologists) were candidates for. The mean age of our patients were 38 years old, who didn't respond to pharmacologic treatment had a definitive contraception. Among these women, 119 (96%) had a reduction in bleeding en the first 12 months, 25 (31%) presented with amenorrhea and 1 (<1%) required a surgical approach. Overall, 119 patients (96%) were satisfied with their results. Endometrial ablation is an approved FDA treatment for menorrhagia, which is safe, accessible and effective. With an easy implementation and low rate of complications.

  1. NASA balloon design and flight - Philosophy and criteria

    Science.gov (United States)

    Smith, I. S., Jr.

    1993-01-01

    The NASA philosophy and criteria for the design and flight of scientific balloons are set forth and discussed. The thickness of balloon films is standardized at 20.3 microns to isolate potential film problems, and design equations are given for specific balloon parameters. Expressions are given for: flight-stress index, total required thickness, cap length, load-tape rating, and venting-duct area. The balloon design criteria were used in the design of scientific balloons under NASA auspices since 1986, and the resulting designs are shown to be 95 percent effective. These results represent a significant increase in the effectiveness of the balloons and therefore indicate that the design criteria are valuable. The criteria are applicable to four balloon volume classes in combination with seven payload ranges.

  2. Choanal Atresia: Surgical Management by Hegar's Dilators.

    Science.gov (United States)

    Sinha, Vikas; Gurnani, Deepanshu; Modi, Niral R; Barot, Dilavar A; Maniyar, Hiten R; Pandey, Ambuj

    2014-09-01

    Choanal atresia is one of the more commonly observed congenital abnormalities of the nose. The condition is predominantly found in females with a M:F ratio of 1:2. 65-75 % of patients with choanal atresia are unilateral, and the rest are bilateral. About 50 % of the cases are associated with other congenital anomalies, the most common being coloboma, Heart disease, choanal atresia, mental and growth retardation, genital hypoplasia, ear deformities syndrome. The embryonic origin of choanal atresia is due to persistent bucco-pharyngeal or naso-buccal membrane. Our study was a retrospective study of 14 cases of choanal atresia. All the cases were operated by the first author. Each patient was investigated in detail and recorded by stratifying in sex of patient, age of presentation, type and site of atresia, and associated other congenital anomalies. Patient were operated under general anesthesia and Hegar's dilators were used to perforate the atretic plate as Hegar's dilators are believed to have ideal curvature with respect to the sloping contour of the nasal floor. Out of the total 14 cases, 9 (64 %, n = 14) cases were male and 5 (36 %, n = 14) females. The age variations varied from youngest of 3 days to the oldest 31 year old female. Stents were kept for a period of 6-8 weeks and regular follow up nasal endoscopy was done weekly for suctioning and visualizing the size of the airway. There are five different surgical approaches that have been described for surgical treatment of choanal atresia: (1) trans-nasal, (2) trans-palatal, (3) trans-septal, (4) trans-antral and (5) sublabial-transnasal. In our study M:F ratio was 1.8:1 which is comparable Gosepath et al. (Rhinology 45:158-163, 2007) (2:1). In our study bilateral atresia was seen in 43 % (6, n = 14) and unilateral in 57 % (8, n = 14) which is comparable to Newman et al. (44 % bilateral cases, n = 43). Amicable and prompt referral to the ENT surgeon can be of immense value so as to buy

  3. Stenting vs. balloon angioplasty with provisional stenting for the treatment of vessels with small reference diameter.

    Science.gov (United States)

    Lemos, Pedro A; Martinez, Eulogio E; Quintella, Edgard; Harrell, Lari C; Ramires, Jose A F; Ribeiro, Expedito E; da Gama, Marcus N; Horta, Pedro E; Kajita, Luiz J; Esteves, Antonio; Perin, Marco A; Soares, Paulo R; Zalc, Silvio; Palacios, Igor F

    2002-03-01

    A consecutive series of interventions in vessels with reference diameter < or = 2.75 mm was retrospectively analyzed according to preprocedure strategy: balloon angioplasty with provisional stenting (PTCA group, 73 patients) and primary stenting (PS group, 122 patients). In the PS group, there were more patients with single-vessel disease (54.1% vs. 37.0%; P = 0.021), less patients with three-vessel disease (9.0% vs. 24.7%; P = 0.003), more LAD interventions (54.9% vs. 31.5; P = 0.002), and less left circumflex interventions (22.1% vs. 45.2%; P < 0.001). Reference diameter was larger in the PS group (2.28 +/- 0.35 mm vs. 2.11 +/- 0.36 mm; P = 0.001). Provisional stenting was performed in 39.7% of PTCA group. At long-term outcome, the incidence of composite major events was similar between the PTCA and the PS groups (20.5% vs. 17.2%, respectively; P = NS). Treatment of small vessels with balloon dilatation and provisional stenting or with primary stenting yielded similar late outcomes. Operators' choice of treatment strategy was based on particular angiographic characteristics. Copyright 2002 Wiley-Liss, Inc.

  4. Brain 'Embolism' Detected by Magnetic Resonance Imaging During Percutaneous Mitral Balloon Commissurotomy

    International Nuclear Information System (INIS)

    Rocha, Paulo; Qanadli, Salah D.; Strumza, Pierre; Kacher, Safia; Aberkane, Linda; Aubry, Pierre; Rigaud, Michel; Lacombe, Pascal; Raffestin, Bernadette

    1999-01-01

    Purpose: The common finding of thrombi between the bifoil balloons when they were extracted after mitral dilation prompted us to look for evidence of minor brain embolisms using the sensitive technique of BMRI (brain magnetic resonance T2-weighted imaging). Methods: BMRI was performed within 48 hr before and after a percutaneous mitral balloon commissurotomy (PMBC) in each of the 63 patients in this study. Results: There was evidence (hyperintensity foci: HI) of a previous asymptomatic brain embolism in 38 of 63 patients before PMBC and a new HI appeared in 18 of 63 patients after the procedure. New HI signals were found exclusively in the white matter in 8 of 18 patients and in only 3 of 18 were HI signs larger than 1 cm. One patient, with an HI signal >1 cm in the thalamus and another 8; 4, patients from western countries vs the others) were not statistically significant, probably because the number of patients in each subgroup was low. Patients in atrial fibrillation had slightly more (not significant) HI before PMBC (15/20, 75%) than patients in sinus rhythm (23/43, 53%), but after PMBC their HI frequencies were similar (atrial fibrillation: 5/20, 25%; sinus rhythm: 13/43, 30%). Conclusion: Brain microembolism is frequent during PMBC, but is often anatomically limited and free from clinical signs in most cases. Brain embolism seems to be related mainly to the procedure itself and not the features of the patient

  5. Randomized comparison of final kissing balloon dilatation versus no final kissing balloon dilatation in patients with coronary bifurcation lesions treated with main vessel stenting: the Nordic-Baltic Bifurcation Study III

    DEFF Research Database (Denmark)

    Niemelä, Matti; Kervinen, Kari; Erglis, Andrejs

    2011-01-01

    , or stent thrombosis within 6 months. The 6-month major adverse cardiac event rates were 2.1% and 2.5% (P=1.00) in the FKBD and no-FKBD groups, respectively. Procedure and fluoroscopy times were longer and more contrast media was needed in the FKBD group than in the no-FKBD group. Three hundred twenty...... angiographic side branch (re)stenosis, especially in patients with true bifurcation lesions. The simple no-FKBD procedures resulted in reduced use of contrast media and shorter procedure and fluoroscopy times. Long-term data on stent thrombosis are needed....

  6. Laparoscopic management of a small bowel obstruction secondary to Elipse intragastric balloon migration: A case report

    Directory of Open Access Journals (Sweden)

    Saud Al-Subaie

    Full Text Available Introduction: The Elipse™ intragastric balloon (IGB for weight loss is a swallowable capsule that is filled with 550 mL of fluid and resides in the stomach for four months before being excreted from the gastrointestinal tract. Although initial data showed that use of this device is safe and free from serious complications, we report for the first time the successful management of an Elipse™ IGB-related adverse event. Presentation of case: A 41-year-old woman presented to our emergency department following two days of abdominal pain, vomiting, and constipation. Her medical history included four caesarean sections and insertion of the Elipse™ IGB 16 weeks prior to presentation. The patient was vitally stable at presentation and abdominal examination revealed a mildly distended abdomen. Plain X-ray revealed a small bowel obstruction (SBO, and a double contrast computed tomography scan showed a dilated small bowel with mild free fluid proximal to a transition zone at the distal jejunum. Laparoscopic enterotomy was performed just proximal to the obstruction site, and the balloon was visualized and extracted after it had been incised and emptied. The enterotomy incision was closed with an intracorporeal continuous absorbable suture. The patient’s recovery was uneventful and she was discharged on postoperative day 4. Discussion: We discuss the possible etiologies of SBO following Elipse™ IGB insertion, and present a brief literature review regarding surgical and nonsurgical management options for such cases. Conclusion: Although initial data showed the Elipse™ IGB to be safe, complications can occur and be managed successfully. Keywords: Elipse, Intragastric balloon, Capsule, Obesity, Case report

  7. Vaginal dilator therapy for women receiving pelvic radiotherapy.

    Science.gov (United States)

    Miles, Tracie; Johnson, Nick

    2010-09-08

    Many vaginal dilator therapy guidelines advocate routine vaginal dilation during and after pelvic radiotherapy to prevent stenosis (abnormal narrowing of the vagina). The UK Gynaecological Oncology Nurse Forum recommend dilation "three times weekly for an indefinite time period". The UK patient charity Cancer Backup advises using vaginal dilators from two to eight weeks after the end of radiotherapy treatment. Australian guidelines recommend dilation after brachytherapy "as soon as is comfortably possible" and "certainly within four weeks and to continue for three years or indefinitely if possible". However, dilation is intrusive, uses health resources and can be psychologically distressing. It has also caused rare but very serious damage to the rectum. To review the benefits and harms of vaginal dilation therapy associated with pelvic radiotherapy for cancer. Searches included the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library 2008, Issue 4), MEDLINE (1950 to 2008), EMBASE (1980 to 2008) and CINAHL (1982 to 2008). Any comparative randomised controlled trials (RCT) or data of any type which compared dilation or penetration of the vagina after pelvic radiotherapy treatment for cancer. The review authors independently abstracted data and assessed risk of bias. We analysed the mean difference in sexual function scores and the risk ratio for non-compliance at six weeks and three months in single trial analyses. No trials met the inclusion criteria. Dilation during or immediately after radiotherapy can, in rare cases, cause damage and there is no persuasive evidence from any study to demonstrate that it prevents stenosis. Data from one RCT showed no improvement in sexual scores in women who were encouraged to practice dilation. Two case series and one comparative study using historical controls suggest that dilation might be associated with a longer vaginal length but these data cannot reasonably be interpreted to show that dilation

  8. In vitro analysis of balloon cuffing phenomenon: inherent biophysical properties of catheter material or mechanics of catheter balloon deflation?

    Science.gov (United States)

    Chung, Eric; So, Karina

    2012-06-01

    To investigates the different methods of balloon deflation, types of urinary catheters and exposure to urine media in catheter balloon cuffing. Bardex®, Bard-Lubri-Sil®, Argyle®, Releen® and Biocath® were tested in sterile and E.Coli inoculated urine at 0, 14 and 28 days. Catheter deflation was performed with active deflation; passive deflation; passive auto-deflation; and excision of the balloon inflow channel. Balloon cuffing was assessed objectively by running the deflated balloon over a plate of agar and subjectively by 3 independent observers. Bardex®, Argyle® and Biocath® showed greater degree of catheter balloon cuffing (p deflation was the worst method (p 0.05). Linear regression model analysis confirmed time as the most significant factor. The duration of catheters exposure, different deflation methods and types of catheters tested contributed significantly to catheter balloon cuffing (p < 0.01).

  9. Dilated cardiomyopathy in cats - A case report

    Directory of Open Access Journals (Sweden)

    K. Jeyaraja

    2013-08-01

    Full Text Available Two cats were brought to Madras Veterinary College Teaching Hospital with the history and clinical signs suggestive of congestive heart failure ie, coughing, exercise intolerance, dyspnea, abdominal distension etc. There was history of feeding the cat with home made diet in one case and in other with commercial dog food. Based on electrocardiographic, radiographic and echocardiographic findings, the diagnosis of dilated cardiomyopathy was done in both the cases. The cases were managed with enalapril maleate, furosemide, dietary taurine supplementation and other supportive therapy. Among these two cases, one cat died on 2nd day of treatment and the other showed recovery after 8 days of treatment. [Vet World 2013; 6(4.000: 226-227

  10. A Case Report of Reversible Dilated Cardiomyopathy

    Directory of Open Access Journals (Sweden)

    Abhishek Singhai

    2014-01-01

    Full Text Available Dilated cardiomyopathy (DCM is mostly an idiopathic disease with a progressive and irreversible course. It carries poor prognosis and outcome. Rarely, a reversible metabolic etiology that is amenable to specific therapy is identified. Alteration in thyroid status can lead to changes in systolic and diastolic function of left ventricle. Heart is sensitive to thyroid hormone changes, and cardiac disorders are commonly associated with both hyper and hypothyroidism. Diastolic dysfunction is the most common abnormality reported in hypothyroidism. In systolic function, prolonged systolic time interval or normal cardiac function has been reported by most workers. DCM is a rare presentation of hypothyroidism. Here, we report a case of 40-year-old female diagnosed with DCM due to hypothyroidism

  11. Isolated dilated pupil: Is it adie's pupil?

    Directory of Open Access Journals (Sweden)

    Uma Sinharoy

    2016-01-01

    Full Text Available Adie's tonic pupil, though well known in literature is a rarity in practice. Few case reports have mentioned the occurrence of Adie's pupil during a migraine attack. We report a young female with a history of migraine without aura presenting with asymmetric pupils during migraine attack. Her right pupil was dilated, unresponsive to light with poor response to near reflex. She also had a bilateral loss of ankle jerks. In 0.125% pilocarpine test, the affected pupil responded significantly, and Holmes Adie's syndrome was diagnosed. The patient remained asymptomatic after adjustment of refraction of the right eye for the near vision. It is usually a benign condition. Early clinical detection of such condition is necessary to prevent unnecessary and costly investigations as well to reassure the patient.

  12. Intraventricular vortex properties in nonischemic dilated cardiomyopathy

    Science.gov (United States)

    Benito, Yolanda; Alhama, Marta; Yotti, Raquel; Martínez-Legazpi, Pablo; del Villar, Candelas Pérez; Pérez-David, Esther; González-Mansilla, Ana; Santa-Marta, Cristina; Barrio, Alicia; Fernández-Avilés, Francisco; del Álamo, Juan C.

    2014-01-01

    Vortices may have a role in optimizing the mechanical efficiency and blood mixing of the left ventricle (LV). We aimed to characterize the size, position, circulation, and kinetic energy (KE) of LV main vortex cores in patients with nonischemic dilated cardiomyopathy (NIDCM) and analyze their physiological correlates. We used digital processing of color-Doppler images to study flow evolution in 61 patients with NIDCM and 61 age-matched control subjects. Vortex features showed a characteristic biphasic temporal course during diastole. Because late filling contributed significantly to flow entrainment, vortex KE reached its maximum at the time of the peak A wave, storing 26 ± 20% of total KE delivered by inflow (range: 1–74%). Patients with NIDCM showed larger and stronger vortices than control subjects (circulation: 0.008 ± 0.007 vs. 0.006 ± 0.005 m2/s, respectively, P = 0.02; KE: 7 ± 8 vs. 5 ± 5 mJ/m, P = 0.04), even when corrected for LV size. This helped confining the filling jet in the dilated ventricle. The vortex Reynolds number was also higher in the NIDCM group. By multivariate analysis, vortex KE was related to the KE generated by inflow and to chamber short-axis diameter. In 21 patients studied head to head, Doppler measurements of circulation and KE closely correlated with phase-contract magnetic resonance values (intraclass correlation coefficient = 0.82 and 0.76, respectively). Thus, the biphasic nature of filling determines normal vortex physiology. Vortex formation is exaggerated in patients with NIDCM due to chamber remodeling, and enlarged vortices are helpful for ameliorating convective pressure losses and facilitating transport. These findings can be accurately studied using ultrasound. PMID:24414062

  13. Stenosis in laparoscopic gastric bypass: management by endoscopic dilation without fluoroscopic guidance Estenosis tras derivación gástrica laparoscópica: tratamiento mediante dilataciones endoscópicas sin control radiológico

    Directory of Open Access Journals (Sweden)

    Jesús Espinel

    2011-10-01

    Full Text Available Objectives: gastric bypass is the surgical procedure that is carried out most frequently in the treatment of morbid obesity. Stenosis of the gastro-jejunal anastomosis is a relatively frequent complication that requires endoscopic management. However, the optimal dilation technique is yet to be determined. The purpose of this study was to evaluate the safety and efficacy of dilation with a hydrostatic balloon (CRE without radioscopic guidance in morbidly obese patients treated by laparoscopic bypass. Material and methods: retrospective review of the data elicited from 525 patients treated against morbid obesity with laparoscopic gastric bypass from January, 2006 to November, 2010. Results: a total of 22/525 patients (4.1% developed stenosis of the anastomosis [20 women (91%, 2 men (9%]. In four patients (18.2%, there was an associated anastomotic ulcer, and in one case, there was a history of bleeding of an ulcer treated with sclerosis one month earlier. The diagnosis of stenosis was done in most patients during the first 90 days after the bypass. All cases were resolved by means of endoscopic dilation without radioscopic guidance, 15 cases (68.1% required a single session, 6 cases (27.2% two sessions, and 1 case (4.5% required four sessions. This last case had an associated anastomotic ulcer. The diameter of the balloons ranged from 12 to 20 mm, generally using diameters of 12-15 mm in the first session, and increasing them in the following sessions according to the previous result. One patient treated with a 20 mm balloon presented with a small tear, without showing any evidence of leak of contrast medium in the radioscopic guidance, and was thus managed conservatively. In the follow-up, no re-stenoses were detected. Conclusions: in our experience, stenosis of the anastomosis in the laparoscopic gastric bypass is an infrequent complication. When it happens, dilation with a hydrostatic balloon is an effective and safe treatment. Radioscopic

  14. Ballooning for Biologists: Mission Essentials for Flying Experiments on Large NASA Balloons

    Science.gov (United States)

    Smith, David J.; Sowa, Marianne

    2017-01-01

    Despite centuries of scientific balloon flights, only a handful of experiments have produced biologically-relevant results. Yet unlike orbital spaceflight, it is much faster and cheaper to conduct biology research with balloons, sending specimens to the near space environment of Earths stratosphere. Samples can be loaded the morning of a launch and sometimes returned to the laboratory within one day after flying. The National Aeronautics and Space Administration (NASA) flies large, unmanned scientific balloons from all over the globe, with missions ranging from hours to weeks in duration. A payload in the middle portion of the stratosphere (approx. 35 km above sea level) will be exposed to an environment similar to the surface of Mars: temperatures generally around -36 C, atmospheric pressure at a thin 1 kPa, relative humidity levels <1%, and a harsh illumination of ultraviolet (UV) and cosmic radiation levels (about 100 W/sq m and 0.1 mGy/d, respectively) that can be obtained nowhere else on the surface of the Earth, including environmental chambers and particle accelerator facilities attempting to simulate space radiation effects. Considering the operational advantages of ballooning and the fidelity of space-like stressors in the stratosphere, researchers in aerobiology, astrobiology, and space biology can benefit from balloon flight experiments as an intermediary step on the extraterrestrial continuum (ground, low Earth orbit, and deep space studies). Our presentation targets biologists with no background or experience in scientific ballooning. We will provide an overview of large balloon operations, biology topics that can be uniquely addressed in the stratosphere, and a roadmap for developing payloads to fly with NASA.

  15. 21 CFR 884.4260 - Hygroscopic Laminaria cervical dilator.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Hygroscopic Laminaria cervical dilator. 884.4260... Devices § 884.4260 Hygroscopic Laminaria cervical dilator. (a) Identification. A hygroscopic Laminaria... conical and expansible material made from the root of a seaweed (Laminaria digitata or Laminaria japonica...

  16. Micrograft dilators: in pursuit of the undetectable hairline.

    Science.gov (United States)

    Marritt, E

    1988-03-01

    The process of single-hair transplanting, though providing obvious cosmetic advantages in hairline refinement, has long been considered too tedious and time consuming to be incorporated into standard transplant sessions. Micrograft dilators provide dilatation, organization, and hemostasis, while permitting large numbers of micrografts to be placed quickly and effortlessly below the standard transplanted hairline.

  17. Acute gastric dilatation secondary to septicemia in newborn: A rare ...

    African Journals Online (AJOL)

    ... case of acute gastric dilatation that developed in a two-days old child who was born premature and was suffering from septicemia and respiratory distress. The causes and the differential diagnosis of the rare condition are discussed. Keywords: Acute, dilatation, gastric, newborn. African Journal of Paediatric Surgery Vol.

  18. Molecular genetics of dilated cardiomyopathy in the Dobermann dog

    NARCIS (Netherlands)

    Stabej, Polona

    2005-01-01

    Canine dilated cardiomyopathy (DCM) is a disease of the myocardium associated with dilatation and impaired contraction of the ventricles. It primarily affects large and giant breed dogs with Dobermanns being one of the most frequently affected. The high prevalence of DCM in specific breeds suggests

  19. Evolution of scientific ballooning and its impact on astrophysics research

    Science.gov (United States)

    Jones, William Vernon

    2014-05-01

    As we celebrate the centennial year of the discovery of cosmic rays on a manned balloon, it seems appropriate to reflect on the evolution of ballooning and its scientific impact. Balloons have been used for scientific research since they were invented in France more than 200 years ago. Ballooning was revolutionized in 1950 with the introduction of the so-called natural shape balloon with integral load tapes. This basic design has been used with more or less continuously improved materials for scientific balloon flights for more than a half century, including long-duration balloon (LDB) flights around Antarctica for the past two decades. The U.S. National Aeronautics and Space Administration (NASA) is currently developing the next generation super-pressure balloon that would enable extended duration missions above 99.5% of the Earth's atmosphere at any latitude. The Astro2010 Decadal Survey report supports super-pressure balloon development and the giant step forward it offers with ultra-long-duration balloon (ULDB) flights at constant altitudes for about 100 days.

  20. Retrograde prostatic urethroplasty with balloon catheter

    International Nuclear Information System (INIS)

    Castaneda, F.; Reddy, P.; Hulbert, J.; Letourneau, J.G.; Hunter, D.W.; Castaneda-Zuniga, W.R.; Amplatz, K.

    1987-01-01

    The authors performed retrograde prostatic urethroplasty in 18 patients using a 25-mm urethroplasty balloon catheter. The procedure was performed on an outpatient basis under local anesthesia. Voiding cystourethrography, retrograde urethrography, rectal US, and MRE imaging were performed before and immediately after the procedure and at 2 weeks and 3, 6, 12, and 18 months. Long-term results at 18 months and possible clinical implications are discussed

  1. Numerical Modelling Of Pumpkin Balloon Instability

    Science.gov (United States)

    Wakefield, D.

    Tensys have been involved in the numerical formfinding and load analysis of architectural stressed membrane structures for 15 years. They have recently broadened this range of activities into the `lighter than air' field with significant involvement in aerostat and heavy-lift hybrid airship design. Since early 2004 they have been investigating pumpkin balloon instability on behalf of the NASA ULDB programme. These studies are undertaken using inTENS, an in-house finite element program suite based upon the Dynamic Relaxation solution method and developed especially for the non-linear analysis and patterning of membrane structures. The paper describes the current state of an investigation that started with a numerical simulation of the lobed cylinder problem first studied by Calladine. The influence of material properties and local geometric deformation on stability is demonstrated. A number of models of complete pumpkin balloons have then been established, including a 64-gore balloon with geometry based upon Julian Nott's Endeavour. This latter clefted dramatically upon initial inflation, a phenomenon that has been reproduced in the numerical model. Ongoing investigations include the introduction of membrane contact modelling into inTENS and correlation studies with the series of large-scale ULDB models currently in preparation.

  2. Long Duration Balloon Charge Controller Stack Integration

    Science.gov (United States)

    Clifford, Kyle

    NASA and the Columbia Scientific Balloon Facility are interested in updating the design of the charge controller on their long duration balloon (LDB) in order to enable the charge controllers to be directly interfaced via RS232 serial communication by a ground testing computers and the balloon's flight computer without the need to have an external electronics stack. The design involves creating a board that will interface with the existing boards in the charge controller in order to receive telemetry from and send commands to those boards, and interface with a computer through serial communication. The inputs to the board are digital status inputs indicating things like whether the photovoltaic panels are connected or disconnected; and analog inputs with information such as the battery voltage and temperature. The outputs of the board are 100ms duration command pulses that will switch relays that do things like connect the photovoltaic panels. The main component of this design is a PIC microcontroller which translates the outputs of the existing charge controller into serial data when interrogated by a ground testing or flight computer. Other components involved in the design are an AD7888 12-bit analog to digital converter, a MAX3232 serial transceiver, various other ICs, capacitors, resistors, and connectors.

  3. Intragastric balloon for treatment-resistant obesity: safety, tolerance, and efficacy of 1-year balloon treatment followed by a 1-year balloon-free follow-up

    NARCIS (Netherlands)

    Mathus-Vliegen, Elisabeth M. H.; Tytgat, Guido N. J.

    2005-01-01

    Background: Prior efforts to treat obesity with intragastric balloons were thwarted by high complication rates. Therefore, fundamental requirements for optimal balloon designs were defined. The aim of the present study was to investigate the effectiveness, the safety; and the tolerance of a new

  4. Initial Experience with Balloon-Occluded Trans-catheter Arterial Chemoembolization (B-TACE) for Hepatocellular Carcinoma

    Energy Technology Data Exchange (ETDEWEB)

    Maruyama, Mitsunari, E-mail: mitunari@med-shimane.u.ac.jp; Yoshizako, Takeshi, E-mail: yosizako@med.shimane-u.ac.jp; Nakamura, Tomonori, E-mail: t-naka@med.shimane-u.ac.jp; Nakamura, Megumi, E-mail: megumi@med.shimane-u.ac.jp; Yoshida, Rika, E-mail: yoshidar@med.shimane-u.ac.jp; Kitagaki, Hajime, E-mail: kitagaki@med.shimane-u.ac.jp [Shimane University Faculty of Medicine, Department of Radiology (Japan)

    2016-03-15

    PurposeThis study was performed to evaluate the accumulation of lipiodol emulsion (LE) and adverse events during our initial experience of balloon-occluded trans-catheter arterial chemoembolization (B-TACE) for hepatocellular carcinoma (HCC) compared with conventional TACE (C-TACE).MethodsB-TACE group (50 cases) was compared with C-TACE group (50 cases). The ratio of the LE concentration in the tumor to that in the surrounding embolized liver parenchyma (LE ratio) was calculated after each treatment. Adverse events were evaluated according to the Common Terminology Criteria for Adverse Effects (CTCAE) version 4.0.ResultsThe LE ratio at the level of subsegmental showed a statistically significant difference between the groups (t test: P < 0.05). Only elevation of alanine aminotransferase was more frequent in the B-TACE group, showing a statistically significant difference (Mann–Whitney test: P < 0.05). While B-TACE caused severe adverse events (liver abscess and infarction) in patients with bile duct dilatation, there was no statistically significant difference in incidence between the groups. Multivariate logistic regression analysis suggested that the significant risk factor for liver abscess/infarction was bile duct dilatation (P < 0.05).ConclusionThe LE ratio at the level of subsegmental showed a statistically significant difference between the groups (t test: P < 0.05). B-TACE caused severe adverse events (liver abscess and infarction) in patients with bile duct dilatation.

  5. Cerebrospinal Fluid Enhancement on Fluid Attenuated Inversion Recovery Images After Carotid Artery Stenting with Neuroprotective Balloon Occlusions: Hemodynamic Instability and Blood–Brain Barrier Disruption

    International Nuclear Information System (INIS)

    Ogami, Ryo; Nakahara, Toshinori; Hamasaki, Osamu; Araki, Hayato; Kurisu, Kaoru

    2011-01-01

    Purpose: A rare complication of carotid artery stenting (CAS), prolonged reversible neurological symptoms with delayed cerebrospinal fluid (CSF) space enhancement on fluid attenuated inversion recovery (FLAIR) images, is associated with blood–brain barrier (BBB) disruption. We prospectively identified patients who showed CSF space enhancement on FLAIR images. Methods: Nineteen patients—5 acute-phase and 14 scheduled—underwent 21 CAS procedures. Balloon catheters were navigated across stenoses, angioplasty was performed using a neuroprotective balloon, and stents were placed with after dilation under distal balloon protection. CSF space hyperintensity or obscuration on FLAIR after versus before CAS indicated CSF space enhancement. Correlations with clinical factors were examined. Results: CSF space was enhanced on FLAIR in 12 (57.1%) cases. Postprocedural CSF space enhancement was significantly related to age, stenosis rate, acute-stage procedure, and total occlusion time. All acute-stage CAS patients showed delayed enhancement. Only age was associated with delayed CSF space enhancement in scheduled CAS patients. Conclusions: Ischemic intolerance for severe carotid artery stenosis and temporary neuroprotective balloon occlusion, causing reperfusion injury, seem to be the main factors that underlie BBB disruption with delayed CSF space enhancement shortly after CAS, rather than sudden poststenting hemodynamic change. Our results suggest that factors related to hemodynamic instability or ischemic intolerance seem to be associated with post-CAS BBB vulnerability. Patients at risk for hemodynamic instability or with ischemic intolerance, which decrease BBB integrity, require careful management to prevent intracranial hemorrhagic and other post-CAS complications.

  6. [Angioplasty of the anterior descending artery with abnormal origin: use of a new low-profile catheter balloon. A case report].

    Science.gov (United States)

    Tanajura, L F; Maldonado, G; Cano, M N; Mattos, L A; Feres, F; Pinto, I M; Fontes, V F; Souza, A G; Sousa, J E

    1990-03-01

    It is possible to perform transluminal coronary angioplasty (TCA) in thin vessels presenting severe obstructions. One of the achievements that made such procedure possible is the development of a new generation of balloon catheters. In this case report the TCA was performed in a very thin left anterior descending artery with an anomalous origin, a quite rare situation that represents a major problem to the traditional dilator system. The catheter used was a Probe (USCI), which differs of the traditional balloons in a number of characteristics. The authors consider the procedure in detail pointing out the advantages of using of the new generations and discuss the impact that newer technological developments will have in enlarging the indications for TCA and improving the results.

  7. Superpressure Balloon Design Using Nonlinear Viscoelasticity

    Science.gov (United States)

    Rand, James; Rand, James; Wakefield, David

    Stratospheric balloon platforms are used extensively by scientists for a variety of purposes. The typical balloon used today is the zero pressure natural shape fabricated from a thin film of linear low density polyethylene. This material has been found to possess a variety of desirable characteristics suitable to this environment. This film will remain ductile at very low temperatures which will permit it to develop large strains if necessary to satisfy equilibrium considerations. However, in order to achieve long duration flight without significant changes in altitude, the balloon should be pressurized to the extent necessary to maintain constant volume during typical variations in temperature. In the past, pressurized balloons were fabricated from other materials in order to achieve significant increases in strength. Thin films of polyester or polyimide have been used to make relatively small spheres capable of long duration flight. Unfortunately, these materials do not have the ductility of polyethylene at low temperature and are somewhat more fragile and subject to damage. In recent years various organizations have attempted to use the characteristic shape of a pumpkin to limit the stresses in a balloon envelope to that which can be accommodated by laminated fabric materials. While developing the design, analysis and construction techniques for this type of system, the use of polyethylene has been successfully demonstrated to provide a reliable envelope. This shape is achieved by using high strength members in the meridional direction to carry the very high loads generated by the pressure. These so called "tendons" have very low elongation and serve to limit the deformation of the film in that direction. However, earlier designs attempted to limit the stresses in the circumferential direction by using a lobe angle to control the stress. Unfortunately this has led to a number of stability problems with this type of balloon. In order to control the stability of

  8. Quantification of left ventricular dilatation in myocardial perfusion scintigraphy

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez, Mauren B. Azambuja, E-mail: medicinanuclear@hsvp.com.b, E-mail: mauren.gonzalez@gmail.co [Pontificia Universidade Catolica do Rio Grande do Sul (PUC-RS), Porto Alegre, RS (Brazil). Clinica Medica. Programa de Pos-Graduacao em Medicina e Ciencias da Saude; Azambuja, Roberto Alves [Hospital Sao Vicente de Paulo, Passo Fundo, RS (Brazil); Bodanese, Luiz Carlos [Pontificia Universidade Catolica do Rio Grande do Sul (PUC-RS), Porto Alegre, RS (Brazil). Hospital Sao Lucas. Serv. de Cardiologia

    2011-05-15

    Background: the rate of transient dilatation can be determined by exercise testing or pharmacological stress test. It is unknown whether the type of stress has an impact on average transient dilatation index values. Objective: to compare average transient dilation index values in 99mTc-sestamibi scintigraphy in patients undergoing treadmill stress test, versus dipyridamole stress test. The secondary purpose was to evaluate the impact on the average index value by demographic characteristics, risk factors for coronary artery disease and severity of ischemia. Methods: the cross-sectional study included 200 patients between 40 and 70 years old, with or without risk factors for ischemic heart disease, with or without a previous diagnosis of ischemic heart disease. The separation between groups was sequential. The software 4D-MSPECT calculated the transient dilatation index and provided a scoring system for perfusion analysis. Results: the average transient dilation index value of the group undergoing exercise stress test was 1.06 ({+-}0.23). For the group undergoing the dipyridamole stress test, it was 1.10 ({+-}0.22); (p = 0.200). There was no association between the type of stress and the average transient dilatation index values. An association was found between the average index values and age only for those patients from the exercise test group (p = 0.009). Conclusion: the results of our study demonstrate that the transient dilation index does not differ when patients undergo exercise stress test on a treadmill or pharmacological stress by dipyridamole. (author)

  9. [Balloon cell nevi of the conjunctiva (author's transl)].

    Science.gov (United States)

    Schlageter, P E; Daicker, B

    1975-06-01

    The clinical and histological features of three cases of conjunctival balloon cell nevi are described. This peculiar form of nevus is very rare in the conjunctiva. The findings are compared with the descriptions in the literature of dermal balloon cell nevi. They demonstrate, that the conjunctival and dermal tumours are of idential histological structure. The proliferations of the conjunctival epithelium often found in conjunctival nevi do not modify the balloon cell nevi. These can not be diagnosed clinically. The problems of the pathogenesis of the balloon cell nevi are discussed.

  10. Advanced Li batteries for terrestrial balloons, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — For future advanced terrestrial balloon missions, NASA requires energy dense and power dense energy storage solutions significantly exceeding the performance of...

  11. Hyperspectral Polarimeter for Monitoring Balloon Strain, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — NASA's latest generation of superpressure, ultra long duration balloons (ULDB) extend the flight time for stratospheric experiments to levels previously unattainable...

  12. Deflation of gastric band balloon in pregnancy for improving outcomes.

    Science.gov (United States)

    Jefferys, Amanda E; Siassakos, Dimitrios; Draycott, Tim; Akande, Valentine A; Fox, Robert

    2013-04-30

    In line with the rise in the prevalence of obesity, an increasing number of women of childbearing age are undergoing laparoscopic adjustable gastric banding (LAGB), resulting in an increasing number of pregnancies with a band in place. Currently, there is no consensus on optimal band management in pregnancy. Some clinicians advocate leaving the band balloon inflated to reduce gestational weight gain and associated adverse perinatal outcomes. However, there are concerns that maintaining balloon inflation during pregnancy might increase the risk of band complications and adversely affect fetal development and/or growth as a result of reduced nutritional intake. To compare maternal and perinatal outcomes for elective gastric band balloon deflation versus intention to maintain balloon inflation during pregnancy. We searched the Cochrane Pregnancy and Childbirth Group's Trials Register (30 September 2012) and the Web of Science database (1940 to September 2012). Randomised-controlled trials comparing elective deflation of the gastric band balloon with intention to maintain balloon inflation in pregnant women who have undergone LAGB. Two review authors independently assessed studies for inclusion. No studies met the criteria for inclusion in the review. To date no randomised controlled trials exist that compare elective deflation of the gastric band balloon in pregnancy versus intention to maintain balloon inflation. Further research is needed to define the optimum management of the gastric band balloon in pregnancy.

  13. An Overview of Current and Future Stratospheric Balloon Mission Capabilities

    Science.gov (United States)

    Smith, Michael

    The modern stratospheric balloon has been used for a variety of missions since the late 1940's. Capabilities of these vehicles to carry larger payloads, fly to higher altitudes, and fly for longer periods of time have increased dramatically over this time. In addition to these basic performance metrics, reliability statistics for balloons have reached unprecedented levels in recent years. Balloon technology developed in the United States in the last decade has the potential to open a new era in economical space science using balloons. As always, the advantage of the balloon platform is the fact that missions can be carried out at a fraction of the cost and schedule of orbital missions. A secondary advantage is the fact that instruments can be re-flown numerous times while upgrading sensor and data processing technologies from year to year. New mission capabilities now have the potential for enabling ground breaking observations using balloons as the primary platform as opposed to a stepping stone to eventual orbital observatories. The limit of very high altitude balloon missions will be explored with respect to the current state of the art of balloon materials and fabrication. The same technological enablers will also be applied to possibilities for long duration missions at mid latitudes with payloads of several tons. The balloon types and their corresponding mission profiles will be presented in a performance matrix that will be useful for potential scientific users in planning future research programs.

  14. Critical appraisal of paclitaxel balloon angioplasty for femoral–popliteal arterial disease

    Directory of Open Access Journals (Sweden)

    Herten M

    2016-08-01

    Full Text Available Monika Herten,1 Giovanni B Torsello,1,2 Eva Schönefeld,3 Stefan Stahlhoff2 1Department of Vascular and Endovascular Surgery, University Hospital Münster, 2Department of Vascular Surgery, St Franziskus Hospital, Münster, 3Institute for Education and Student Affairs, University Hospital Münster, Münster, Germany Abstract: Peripheral arterial disease, particularly critical limb ischemia, is an area with urgent need for optimized therapies because, to date, vascular interventions often have limited life spans. In spite of initial encouraging technical success after femoropopliteal percutaneous transluminal angioplasty or stenting, postprocedural restenosis remains the major problem. The challenging idea behind the drug-coated balloon (DCB concept is the biological modification of the injury response after balloon dilatation. Antiproliferative drugs administered via DCBs or drug-eluting stents are able to suppress neointimal hyperplasia, the main cause of restenosis. This article reviews the results of DCB treatments of femoropopliteal and infrapopliteal lesions in comparison to standard angioplasty with uncoated balloons. A systematic literature search was performed in 1 medical journals (ie, MEDLINE, 2 international registers for clinical studies (ie, www.clinicaltrials.gov, and 3 abstracts of scientific sessions. Several controlled randomized trials with follow-up periods of up to 5 years demonstrated the efficacy of paclitaxel –DCB technology. However, calcified lesions seem to affect the efficacy of DCB. Combinations of preconditioning methods with DCBs showed promising results. Although the mechanical abrasion of calcium via atherectomy or laser ablation showed favorable periprocedural results, the long-term impact on restenosis and clinical outcome has to be demonstrated. Major advantages of the DCBs are the rapid delivery of drug at uniform concentrations with a single dose, their efficacy in areas wherein stents have been

  15. Balloon Angioplasty - The Legacy of Andreas Grüntzig, M.D. (1939-1985).

    Science.gov (United States)

    Barton, Matthias; Grüntzig, Johannes; Husmann, Marc; Rösch, Josef

    2014-01-01

    In 1974, at the Medical Policlinic of the University of Zürich, German-born physician-scientist Andreas Grüntzig (1939-1985) for the first time applied a balloon-tipped catheter to re-open a severely stenosed femoral artery, a procedure, which he initially called "percutaneous transluminal dilatation". Balloon angioplasty as a therapy of atherosclerotic vascular disease, for which Grüntzig and Charles T. Dotter (1920-1985) received a nomination for the Nobel Prize in Physiology or Medicine in 1978, became one of the most successful examples of translational medicine in the twentieth century. Known today as percutaneous transluminal angioplasty (PTA) in peripheral arteries or percutaneous transluminal coronary angioplasty (PTCA) or percutaneous coronary intervention (PCI) in coronary arteries, balloon angioplasty has become the method of choice to treat patients with acute myocardial infarction or occluded leg arteries. On the occasion of the 40(th) anniversary of balloon angioplasty, we summarize Grüntzig's life and career in Germany, Switzerland, and the United States and also review the developments in vascular medicine from the 1890s to the 1980s, including Dotter's first accidental angioplasty in 1963. The work of pioneers of catheterization, including Pedro L. Fariñas in Cuba, André F. Cournand in France, Werner Forssmann, Werner Porstmann and Eberhard Zeitler in Germany, António Egas Moniz and Reynaldo dos Santos in Portugal, Sven-Ivar Seldinger in Sweden, and Barney Brooks, Thomas J. Fogarty, Melvin P. Judkins, Richard K. Myler, Dickinson W. Richards, and F. Mason Sones in the United States, is discussed. We also present quotes by Grüntzig and excerpts from his unfinished autobiography, statements of Grüntzig's former colleagues and contemporary witnesses, and have included hitherto unpublished historic photographs and links to archive recordings and historic materials. This year, on June 25, 2014, Andreas Grüntzig would have celebrated his 75(th

  16. AUTOPERFUSION BALLOON CATHETER FOR COMPLICATED CORONARY ANGIOPLASTY - A PROSPECTIVE-STUDY WITH RETROSPECTIVE CONTROLS

    NARCIS (Netherlands)

    DEMUINCK, ED; VANDIJK, RB; DENHEIJER, P; MEEDER, JG; LIE, KI

    1992-01-01

    Prolonged angioplasty balloon inflation with an autoperfusion balloon for failed conventional coronary angioplasty, was compared with emergency surgery for this condition. Restenosis was assessed 6 weeks after successful intervention with the autoperfusion balloon. Forty consecutive patients with

  17. Quadricuspid Aortic Valve Combined with Moderate Ascending Aortic Dilatation

    Science.gov (United States)

    Uspenskiy, Vladimir E.; Osadchii, Alexei M.; Gordeev, Mikhail L.

    2015-01-01

    The quadricuspid aortic valve is a very uncommon malformation associated with aortic insufficiency, aortic stenosis, endocarditis, and ascending aortic dilatation. We report four cases of this aortic valve malformation. One patient with severe aortic regurgitation and moderate aortic dilatation required aortic valve replacement. Three patients had mild or moderate aortic insufficiency combined with moderate ascending aortic dilatation. These patients were referred to follow-up. The presented cases demonstrate that this aortic valve malformation may not be as rare as it appears and that attention must be paid to any quadricuspid findings during computed tomographic angiography and echocardiography. PMID:27390747

  18. Spatial Markov Semigroups Admit Hudson-Parthasarathy Dilations

    OpenAIRE

    Skeide, Michael

    2008-01-01

    For many Markov semigroups dilations in the sense of Hudson and Parthasarathy, that is a dilation which is a cocycle perturbation of a noise, have been constructed with the help of quantum stochastic calculi. In these notes we show that every Markov semigroup on the algebra of all bounded operators on a separable Hilbert space that is spatial in the sense of Arveson, admits a Hudson-Parthasarathy dilation. In a sense, the opposite is also true. The proof is based on general results on the the...

  19. Characterization and Long-Term Prognosis of Postmyocarditic Dilated Cardiomyopathy Compared With Idiopathic Dilated Cardiomyopathy.

    Science.gov (United States)

    Merlo, Marco; Anzini, Marco; Bussani, Rossana; Artico, Jessica; Barbati, Giulia; Stolfo, Davide; Gigli, Marta; Muça, Matilda; Naso, Paola; Ramani, Federica; Di Lenarda, Andrea; Pinamonti, Bruno; Sinagra, Gianfranco

    2016-09-15

    Dilated cardiomyopathy (DC) is the final common pathway of different pathogenetic processes and presents a significant prognostic heterogeneity, possibly related to its etiologic variety. The characterization and long-term prognosis of postmyocarditic dilated cardiomyopathy (PM-DC) remain unknown. This study assesses the clinical-instrumental evolution and long-term prognosis of a large cohort of patients with PM-DC. We analyzed 175 patients affected with DC consecutively enrolled from 1993 to 2008 with endomyocardial biopsy (EMB) data available. PM-DC was defined in the presence of borderline myocarditis at EMB or persistent left ventricular dysfunction 1 year after diagnosis of active myocarditis at EMB. Other patients were defined as affected by idiopathic dilated cardiomyopathy (IDC). Analysis of follow-up evaluations was performed at 24, 60, and 120 months. We found 72 PM-DC of 175 enrolled patients (41%). Compared with IDC, patients with PM-DC were more frequently females and less frequently presented a familial history of DC. No other baseline significant differences were found. During the long-term follow-up (median 154, first to third interquartile range 78 to 220 months), patients with PM-DC showed a trend toward slower disease progression. Globally, 18 patients with PM-DC (25%) versus 49 with IDC (48%) experienced death/heart transplantation (p = 0.045). The prognostic advantage for patients with PM-DC became significant beyond 40 months of follow-up. At multivariable time-dependent Cox analysis, PM-DC was confirmed to have a global independent protective role (hazard ratio 0.53, 95% confidence interval 0.28 to 0.97, p = 0.04). In conclusion, PM-DC is characterized by better long-term prognosis compared with IDC. An exhaustive etiologic characterization appears relevant in the prognostic assessment of DC. Copyright © 2016 Elsevier Inc. All rights reserved.

  20. Planetary Science with Balloon-Borne Telescopes

    Science.gov (United States)

    Kremic, Tibor; Cheng, Andy; Hibbitts, Karl; Young, Eliot

    2015-01-01

    The National Aeronautics and Space Administration (NASA) and the planetary science community have recently been exploring the potential contributions of stratospheric balloons to the planetary science field. A study that was recently concluded explored the roughly 200 or so science questions raised in the Planetary Decadal Survey report and found that about 45 of those questions are suited to stratospheric balloon based observations. In September of 2014, a stratospheric balloon mission called BOPPS (which stands for Balloon Observation Platform for Planetary Science) was flown out of Fort Sumner, New Mexico. The mission had two main objectives, first, to observe a number of planetary targets including one or more Oort cloud comets and second, to demonstrate the applicability and performance of the platform, instruments, and subsystems for making scientific measurements in support planetary science objectives. BOPPS carried two science instruments, BIRC and UVVis. BIRC is a cryogenic infrared multispectral imager which can image in the.6-5 m range using an HgCdTe detector. Narrow band filters were used to allow detection of water and CO2 emission features of the observed targets. The UVVis is an imager with the science range of 300 to 600 nm. A main feature of the UVVis instrument is the incorporation of a guide camera and a Fine Steering Mirror (FSM) system to reduce image jitter to less than 100 milliarcseconds. The BIRC instrument was used to image targets including Oort cloud comets Siding Spring and Jacques, and the dwarf planet 1 Ceres. BOPPS achieved the first ever earth based CO2 observation of a comet and the first images of water and CO2 of an Oort cloud comet (Jacques). It also made the first ever measurement of 1Ceres at 2.73 m to refine the shape of the infrared water absorption feature on that body. The UVVis instrument, mounted on its own optics bench, demonstrated the capability for image correction both from atmospheric disturbances as well as some

  1. Dilation-and-modulation systems on the half real line

    Directory of Open Access Journals (Sweden)

    Yun-Zhang Li

    2016-07-01

    Full Text Available Abstract Translation, dilation, and modulation are fundamental operations in wavelet analysis. Affine frames based on translation-and-dilation operation and Gabor frames based on translation-and-modulation operation have been extensively studied and seen great achievements. But dilation-and-modulation frames have not. This paper addresses a class of dilation-and-modulation systems in L 2 ( R + $L^{2}(\\mathbb {R}_{+}$ . We characterize frames, dual frames, and Parseval frames in L 2 ( R + $L^{2}(\\mathbb {R}_{+}$ generated by such systems. Interestingly, it turns out that, for such systems, Parseval frames, orthonormal bases, and orthonormal systems are mutually equivalent to each other, while this is not the case for affine systems and Gabor systems.

  2. Autologous bone marrow mononuclear cell delivery to dilated ...

    African Journals Online (AJOL)

    Autologous bone marrow mononuclear cell delivery to dilated cardiomyopathy patients: A clinical trial. PLN Kaparthi, G Namita, LK Chelluri, VSP Rao, PK Shah, A Vasantha, SK Ratnakar, K Ravindhranath ...

  3. Pneumothorax, music and balloons: A case series

    Directory of Open Access Journals (Sweden)

    Shiferaw Dejene

    2013-01-01

    Full Text Available We describe two cases of spontaneous pneumothorax in young healthy adults with no underlying structural lung disease. The onset of pneumothorax was following physical activity including playing musical instruments and blowing of balloons. There is sparse data evaluating the pathophysiology of primary spontaneous pneumothorax in relation to increased mouth pressures. These cases highlight the possible physical effect of valsalva manoeuvre on transpulmonary pressures, and the potential risk of developing pneumothorax in otherwise healthy individuals. This aspect of pneumothorax development is worthy of further exploration, to better elucidate the mechanism and enhance our understanding of this common respiratory presentation.

  4. Resistive G-modes and ballooning

    International Nuclear Information System (INIS)

    Dagazian, R.Y.; Mondt, J.P.; Paris, R.B.

    1980-01-01

    A unified theory of the linear stability of the Roberts and Taylor type of resistive interchange and ballooning is presented. The effects of both parallel and perpendicular viscosity as well as of finite shear and finite β are included in a MHD treatment of the problem. Kinetic effects are also studied. The hybrid kinetic model with Vlasov ions and guiding center electrons has been appropriately generalized to allow for electron-ion collisions. The geometry is that of a plane slab with magnetic shear

  5. Simultaneous stent expansion/balloon deflation technique to salvage failed balloon remodeling.

    Science.gov (United States)

    Ladner, Travis R; He, Lucy; Davis, Brandon J; Froehler, Michael T; Mocco, J

    2016-04-01

    Herniation, with possible embolization, of coils into the parent vessel following aneurysm coiling remains a frequent challenge. For this reason, balloon or stent assisted embolization remains an important technique. Despite the use of balloon remodeling, there are occasions where, on deflation of the balloon, some coils, or even the entire coil mass, may migrate. We report the successful use of a simultaneous adjacent stent deployment bailout technique in order to salvage coil prolapse during balloon remodeling in three patients. Case No 1 was a wide neck left internal carotid artery bifurcation aneurysm, measuring 9 mm×7.9 mm×6 mm with a 5 mm neck. Case No 2 was a complex left superior hypophyseal artery aneurysm, measuring 5.3 mm×4 mm×5 mm with a 2.9 mm neck. Case No 3 was a ruptured right posterior communicating artery aneurysm, measuring 4 mm×4 mm×4.5 mm with a 4 mm neck. This technique successfully returned the prolapsed coil mass into the aneurysm sac in all cases without procedural complications. The closed cell design of the Enterprise VRD (Codman and Shurtleff Inc, Raynham, Massachusetts, USA) makes it ideal for this bailout technique, by allowing the use of an 0.021 inch delivery catheter (necessary for simultaneous access) and by avoiding the possibility of an open cell strut getting caught on the deflated balloon. We hope this technique will prove useful to readers who may find themselves in a similar predicament. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

  6. Minimal Cuntz–Krieger dilations and representations of Cuntz ...

    Indian Academy of Sciences (India)

    A-relations we show that there exists a unique minimal dilation to generators of Cuntz–. Krieger algebras or its ... properties of the minimal Cuntz–Krieger dilation and the WOT-closed algebra generated by it is studied in terms ... is equivalent to saying that the operator (T1,...,Tn) from H ⊕···⊕ H (n-times) to H is a contraction.

  7. Non-obstructive cecal dilatation and perforation after cesarean section

    DEFF Research Database (Denmark)

    Sperling, Lene; Schantz, A L; Toftager-Larsen, K

    1990-01-01

    A case of non-obstructive cecal dilatation and perforation after cesarean section is reported, with a review of the literature on the diagnosis and management of this entity. Fifteen cases have been described. Attention is called to this rare complication and to the accompanying pseudo......-obstructive syndrome, the diagnosis of which is important in order to avoid cecal perforation. Non-obstructive cecal dilatation is a life threatening complication to cesarean section, and immediate surgical intervention is important....

  8. An unusual triad: Bilateral dilated odontoma, hypodontia and peg laterals

    Directory of Open Access Journals (Sweden)

    Alphy Alphonsa Sebastian

    2013-01-01

    The aim of this case report is to present a rare case of bilateral dilated odontoma affecting a microdontic permanent lateral incisor in a 30 year old female patient with hypodontia and peglateral teeth with its clinical, radiological and histological features, which has yet been not reported. Bilateral presence of dilated odontoma is not a common occurrence, although a single tooth involvement in each case has been reported in the literature.

  9. Sciatica caused by a dilated epidural vein: MR findings

    Energy Technology Data Exchange (ETDEWEB)

    Demaerel, P.; Petre, C.; Wilms, G. [Dept. of Radiology, Catholic University of Leuven (Belgium); Plets, C. [Dept. of Neurosurgery, Catholic University of Leuven (Belgium)

    1999-02-01

    We report the MR imaging findings in a 41-year-old woman presenting with sudden low back pain and sciatica. At surgery a dilated epidural vein was found compressing the nerve root. The MR findings may suggest the diagnosis. Magnetic resonance imaging of a dilated epidural vein or varix causing sciatica has not been reported until now. (orig.) (orig.) With 1 fig., 4 refs.

  10. The Balloon Foot ; A Rare Presentation Of Congenital Constricting ...

    African Journals Online (AJOL)

    We present a case of a rare manifestation of congenital constricting annular band (CAB) in the lower extremity resulting in a severe excessive swelling of the foot which we have termed Balloon foot. The ballooned foot is caused by a progressive deepening of the circumferential constriction into the soft tissue of the lower ...

  11. Scientific ballooning in the 20 th century; a historical perspective

    Science.gov (United States)

    Nishimura, J.

    Hess discovered the cosmic rays in 1912. Using a manned balloon, he found the altitude variation of the radiation. After this discovery, many balloon experiments were performed to explore the most mysterious radiation coming from outside of the earth during the 1920's to the 1930's. At the end of the 1940's, balloon systems were revolutionized by the use of new plastic films and telemetry systems. At almost the same time, highly sensitive nuclear emulsions were developed. Balloon exposures of emulsions brought us new discoveries of the heavy primaries in cosmic rays. Extensive studies with nuclear emulsions discovered high-energy phenomena and new particles between the end of 1940's to the 1960's. At the same time, in various countries, experiments with more sophisticated electronic devices were begun together with ingenious work on balloon technology. Inventions were made in the areas of designing, manufacturing, materials, telemetry systems for balloons and long duration flight systems etc. Several permanent launching stations were established in various countries in the 1960's Here, I review the development of essential technologies in scientific ballooning, and their value in contributing to the growth of space physics. As the future prospect, I stress the point that scientific ballooning is indispensable and a most cost-effective way to explore space astrophysics and Earth science, in addition to the preparation of satellite and the space station experiments.

  12. Coronary artery angioplasty with a helical autoperfusion balloon catheter

    NARCIS (Netherlands)

    Gurbel, PA; Anderson, RD; vanBoven, AJ; denHeijer, P

    The initial in-hospital and long-term clinical experience with a helical autoperfusion balloon catheter in the treatment of coronary artery disease is reported, This new catheter design allows blood to flow passively around the inflated balloon through a protected helical channel molded into the

  13. External caps: An approach to stress reduction in balloons

    Science.gov (United States)

    Hazlewood, K. H.

    Recent findings of the catastrophic balloon failures investigation in the U.S.A. indicate that very large gross inflations, in balloons using present design philosophy, over-stress currently available materials. External caps are proposed as an economic approach to reducting those stresses to an acceptable level.

  14. Spectral dilation of L(B,H)-valued measures and its application to stationary dilation for Banach space valued processes

    Science.gov (United States)

    Miamee, A. G.

    1989-01-01

    Let B be a Banach space and H and K to Hilbert spaces. The spectral dilation of L(B,H)-valued measures is studied and it is shown that the recent results of Makagon and Salehi (1986) and Rosenberg (1982) on the dilation of L(K,H)-valued measures can be extended to hold for the general Banach space setting of L(B,H)-valued measures. These L(B,H)-valued measures are closely connected to the Banach space valued processes. This connection is recalled and as application of spectral dilation of L(B,H)-valued measures the well known stationary dilation results for scalar valued processes is extended to the case of Banach space valued processes.

  15. The ballooning of fuel cladding tubes: theory and experiment

    International Nuclear Information System (INIS)

    Shewfelt, R.S.W.

    1988-01-01

    Under some conditions, fuel clad ballooning can result in considerable strain before rupture. If ballooning were to occur during a loss-of-coolant accident (LOCA), the resulting substantial blockage of the sub-channel would restrict emergency core cooling. However, circumferential temperature gradients that would occur during a LOCA may significantly limit the average strain at failure. Understandably, the factors that control ballooning and rupture of fuel clad are required for the analysis of a LOCA. Considerable international effort has been spent on studying the deformation of Zircaloy fuel cladding under conditions that would occur during a LOCA. This effort has established a reasonable understanding of the factors that control the ballooning, failure time, and average failure strain of fuel cladding. In this paper, both the experimental and theoretical studies of the fuel clad ballooning are reviewed. (author)

  16. Spectrum of the ballooning Schroedinger equation

    International Nuclear Information System (INIS)

    Dewar, R.L.

    1997-01-01

    The ballooning Schroedinger equation (BSE) is a model equation for investigating global modes that can, when approximated by a Wentzel-Kramers-Brillouin (WKB) ansatz, be described by a ballooning formalism locally to a field line. This second order differential equation with coefficients periodic in the independent variable θ k is assumed to apply even in cases where simple WKB quantization conditions break down, thus providing an alternative to semiclassical quantization. Also, it provides a test bed for developing more advanced WKB methods: e.g. the apparent discontinuity between quantization formulae for open-quotes trappedclose quotes and open-quotes passingclose quotes modes, whose ray paths have different topologies, is removed by extending the WKB method to include the phenomena of tunnelling and reflection. The BSE is applied to instabilities with shear in the real part of the local frequency, so that the dispersion relation is inherently complex. As the frequency shear is increased, it is found that trapped modes go over to passing modes, reducing the maximum growth rate by averaging over θ k

  17. Dilation Behavior of Thermal Spray Coatings

    Science.gov (United States)

    Bejarano Lopez, Miryan Lorena

    Thermal Spray (TS) is a very versatile manufacturing process to deposit thick coatings on a variety of substrates. Coatings are used in protective (i.e. wear, chemical attack, high temperature, etc.) and functional (i.e. sensors) applications. TS coatings have a unique lamellar microstructure as a result of the overlapping of millions of molten and partially-molten particles. During processing, high deformation by impact, high temperature, and rapid solidification lead to a complex hierarchical material system that contains a high amount of microstructural defects. The presence of defects in the microstructure contribute to differences in property values in comparison to bulk materials. Thermal stresses and residual strains arise from processing, thermal gradients and thermal exposure. Evaluation of thermal properties, in this case, the coefficient of thermal expansion (CTE) is of vital importance to enhance coating performance. In this dissertation, expansion measurements of various metals, alloys, ceramics, and cermet coatings; were carried out using various techniques (push rod dilatometry, x-ray diffraction XRD, digital image correlation DIC, and curvature method) to determine the dilation behavior at the atomic, micro- and macro-scale levels. The main results were. 1) Mathematical models (Turner and Kerner) used for composite materials, successfully predicted the CTE property of a TS coating where the primary phase is the coating material and the secondary phases can be oxides, precipitates, etc. (formed as a byproduct of the spraying process). CTE was found not to be affected by porosity. 2) Despite the anisotropic behavior characteristic of TS coatings, the experimental results shown that CTE results to be reasonable isotropic within the scope of this study. 3) The curvature method was found to be an alternative technique to obtain the CTE, as well as the Young's modulus of coating in a bi-material strip, with good approximation. 4) An anomalous expansion

  18. THE KISSING BALLOON TECHNIQUE WITH 2 OVER-THE-WIRE BALLOON CATHETERS THROUGH A SINGLE 8-FRENCH GUIDING CATHETER

    NARCIS (Netherlands)

    DENHEIJER, P; BERNINK, PJLM; VANDIJK, RB; TWISK, SPM; LIE, KI

    Some of the newer over-the-wire coronary angioplasty catheters have shaft sizes of 3.0 French (F) or less. The inner diameter of modern 8-F guiding catheters is large enough to accommodate two of such balloon catheters. We report a kissing balloon procedure with two over-the-wire catheters through a

  19. Usefulness of a balloon-expandable, covered stent for the transjugular intrahepatic portosystemic shunt

    Directory of Open Access Journals (Sweden)

    Rössle M

    2018-01-01

    Full Text Available The availability of polytetrafluoroethylene (PTFE covered, self-expandable nitinol stents in 2001 considerably improved the patency, response rates and survival of the transjugular intrahepatic portosystemic shunt (TIPS. Side effects of portosystemic shunting such as hepatic encephalopathy (HE and worsening of hepatic function, however, remained a problem. To reduce HE, underdilatation of nitinol stents has been practiced for many years. However, as shown recently, underdilatation was a flop since, due to their intrinsic memory, nitinol stents always expanded to reach their nominal diameter of 8 or 10 mm. To overcome this problem and to be able to perform permanent shunts with a smaller diameter of < 8 mm, we studied the usefulness of a balloon-expandable, covered, metallic stent which allowed adjustment to any diameter between 5 and 12 mm. Methods: 30 patients with cirrhosis and symptomatic portal hypertension were included. The mean Child-Pugh score was 8 ± 2.17 patients had refractory ascites, 9 patients variceal bleeding and four patients other indications for the TIPS. Results: The TIPS was successfully implanted in all patients within 69.6 ± 21.8 min. The shunt reduced the portosystemic pressure gradient by 57.5 ± 14.2% with a mean stent diameter of 7.4 ± 1.0 mm (5 -10.3 mm. During a mean follow-up of 330 ± 249 days, shunt revision was necessary in 5 patients (17%, four of them had insufficient response and received stent dilatation and one patient had stent misplacement requiring a parallel shunt. Three patients (10% developed HE. Conclusions: The covered, balloon-expandable stent could be placed accurately and allowed creation of adapted shunts with smaller diameters as usual. This resulted in a comparatively low rate of HE.

  20. Long-term results of percutaneous balloon valvuloplasty in pulmonary valve stenosis in the pediatric population.

    Science.gov (United States)

    Merino-Ingelmo, Raquel; Santos-de Soto, José; Coserria-Sánchez, Félix; Descalzo-Señoran, Alfonso; Valverde-Pérez, Israel

    2014-05-01

    Percutaneous pulmonary valvuloplasty is the preferred interventional procedure for pulmonary valve stenosis. The aim of this study was to evaluate the effectiveness of this technique, assess the factors leading to its success, and determine the long-term results in the pediatric population. The study included 53 patients with pulmonary valve stenosis undergoing percutaneous balloon valvuloplasty between December 1985 and December 2000. Right ventricular size and functional echocardiographic parameters, such as pulmonary regurgitation and residual transvalvular gradient, were assessed during long-term follow-up. Peak-to-peak transvalvular gradient decreased from 74 mmHg [interquartile range, 65-100 mmHg] to 20 mmHg [interquartile range, 14-34 mmHg]. The procedure was unsuccessful in 2 patients (3.77%). The immediate success rate was 73.58%. Follow-up ranged from 10 years to 24 years (median, 15 years). During follow-up, all patients developed late pulmonary regurgitation which was assessed as grade II in 58.4% and grade III in 31.2%. There was only 1 case of long-term restenosis (2.1%). Severe right ventricular dilatation was observed in 27.1% of the patients. None of the patients developed significant right ventricular dysfunction. Pulmonary valve replacement was not required in any of the patients. Percutaneous balloon valvuloplasty is an effective technique in the treatment of pulmonary valve stenosis with good long-term results. Copyright © 2013 Sociedad Española de Cardiología. Published by Elsevier Espana. All rights reserved.

  1. Detecting Seismic Infrasound Signals on Balloon Platforms

    Science.gov (United States)

    Krishnamoorthy, S.; Komjathy, A.; Cutts, J. A.; Pauken, M.; Garcia, R.; Mimoun, D.; Jackson, J. M.; Kedar, S.; Smrekar, S. E.; Hall, J. L.

    2017-12-01

    The determination of the interior structure of a planet requires detailed seismic investigations - a process that entails the detection and characterization of seismic waves due to geological activities (e.g., earthquakes, volcanoes, etc.). For decades, this task has primarily been performed on Earth by an ever-expanding network of terrestrial seismic stations. However, on planets such as Venus, where the surface pressure and temperature can reach as high as 90 atmospheres and 450 degrees Celsius respectively, placing seismometers on the planet's surface poses a vexing technological challenge. However, the upper layers of the Venusian atmosphere are more benign and capable of hosting geophysical payloads for longer mission lifetimes. In order to achieve the aim of performing geophysical experiments from an atmospheric platform, JPL and its partners (ISAE-SUPAERO and California Institute of Technology) are in the process of developing technologies for detection of infrasonic waves generated by earthquakes from a balloon. The coupling of seismic energy into the atmosphere critically depends on the density differential between the surface of the planet and the atmosphere. Therefore, the successful demonstration of this technique on Earth would provide ample reason to expect success on Venus, where the atmospheric impedance is approximately 60 times that of Earth. In this presentation, we will share results from the first set of Earth-based balloon experiments performed in Pahrump, Nevada in June 2017. These tests involved the generation of artificial sources of known intensity using a seismic hammer and their detection using a complex network of sensors, including highly sensitive micro-barometers suspended from balloons, GPS receivers, geophones, microphones, and seismometers. This experiment was the first of its kind and was successful in detecting infrasonic waves from the earthquakes generated by the seismic hammer. We will present the first comprehensive analysis

  2. Microcontroller uses in Long-Duration Ballooning

    Science.gov (United States)

    Jones, Joseph

    This paper discusses how microcontrollers are being utilized to fulfill the demands of long duration ballooning (LDB) and the advantages of doing so. The Columbia Scientific Balloon Facility (CSBF) offers the service of launching high altitude balloons (120k ft) which provide an over the horizon telemetry system and platform for scientific research payloads to collect data. CSBF has utilized microcontrollers to address multiple tasks and functions which were previously performed by more complex systems. A microcontroller system has been recently developed and programmed in house to replace our previous backup navigation system which is used on all LDB flights. A similar microcontroller system was developed to be independently launched in Antarctica before the actual scientific payload. This system's function is to transmit its GPS position and a small housekeeping packet so that we can confirm the upper level float winds are as predicted from satellite derived models. Microcontrollers have also been used to create test equipment to functionally check out the flight hardware used in our telemetry systems. One test system which was developed can be used to quickly determine if our communication link we are providing for the science payloads is functioning properly. Another system was developed to provide us with the ability to easily determine the status of one of our over the horizon communication links through a closed loop system. This test system has given us the capability to provide more field support to science groups than we were able to in years past. The trend of utilizing microcontrollers has taken place for a number of reasons. By using microcontrollers to fill these needs, it has given us the ability to quickly design and implement systems which meet flight critical needs, as well as perform many of the everyday tasks in LDB. This route has also allowed us to reduce the amount of time required for personnel to perform a number of the tasks required

  3. Rectal Balloon for the Immobilization of the Prostate Internal Motion

    International Nuclear Information System (INIS)

    Lee, Sang Kyu; Beak, Jong Geal; Kim, Joo Ho; Jeon, Byong Chul; Cho, Jeong Hee; Kim, Dong Wook; Song, Tae Soo; Cho, Jae Ho; Na, Soo Kyong

    2005-01-01

    The using of endo-rectal balloon has proposed as optimal method that minimized the motion of prostate and the dose of rectum wall volume for treated prostate cancer patients, so we make the customized rectal balloon device. In this study, we analyzed the efficiency of the Self-customized rectal balloon in the aspects of its reproducibility. In 5 patients, for treatment planning, each patient was acquired CT slice images in state of with and without rectal balloon. Also they had CT scanning same repeated third times in during radiation treatment (IMRT). In each case, we analyzed the deviation of rectal balloon position and verified the isodose distribution of rectum wall at closed prostate. Using the rectal balloon, we minimized the planning target volume (PTV) by decreased the internal motion of prostate and overcome the dose limit of radiation therapy in prostate cancer by increased the gap between the rectum wall and high dose region. The using of rectal balloon, although, was reluctant to treat by patients. View a point of immobilization of prostate internal motion and dose escalation of GTV (gross tumor volume), its using consider large efficient for treated prostate cancer patients.

  4. Graph-Based Path-Planning for Titan Balloons

    Science.gov (United States)

    Blackmore, Lars James; Fathpour, Nanaz; Elfes, Alberto

    2010-01-01

    A document describes a graph-based path-planning algorithm for balloons with vertical control authority and little or no horizontal control authority. The balloons are designed to explore celestial bodies with atmospheres, such as Titan, a moon of Saturn. The algorithm discussed enables the balloon to achieve horizontal motion using the local horizontal winds. The approach is novel because it enables the balloons to use arbitrary wind field models. This is in contrast to prior approaches that used highly simplified wind field models, such as linear, or binary, winds. This new approach works by discretizing the space in which the balloon operates, and representing the possible states of the balloon as a graph whose arcs represent the time taken to move from one node to another. The approach works with arbitrary wind fields, by looking up the wind strength and direction at every node in the graph from an arbitrary wind model. Having generated the graph, search techniques such as Dijkstra s algorithm are then used to find the set of vertical actuation commands that takes the balloon from the start to the goal in minimum time. In addition, the set of reachable locations on the moon or planet can be determined.

  5. A Survey of Titan Balloon Concepts and Technology Status

    Science.gov (United States)

    Hall, Jeffery L.

    2011-01-01

    This paper surveys the options for, and technology status of, balloon vehicles to explore Saturn's moon Titan. A significant amount of Titan balloon concept thinking and technology development has been performed in recent years, particularly following the spectacular results from the descent and landing of the Huygens probe and remote sensing observations by the Cassini spacecraft. There is widespread recognition that a balloon vehicle on the next Titan mission could provide an outstanding and unmatched capability for in situ exploration on a global scale. The rich variety of revealed science targets has combined with a highly favorable Titan flight environment to yield a wide diversity of proposed balloon concepts. The paper presents a conceptual framework for thinking about balloon vehicle design choices and uses it to analyze various Titan options. The result is a list of recommended Titan balloon vehicle concepts that could perform a variety of science missions, along with their projected performance metrics. Recent technology developments for these balloon concepts are discussed to provide context for an assessment of outstanding risk areas and technological maturity. The paper concludes with suggestions for technology investments needed to achieve flight readiness.

  6. Ballooning modes or Fourier modes in a toroidal plasma?

    International Nuclear Information System (INIS)

    Connor, J.W.; Taylor, J.B.

    1987-01-01

    The relationship between two different descriptions of eigenmodes in a torus is investigated. In one the eigenmodes are similar to Fourier modes in a cylinder and are highly localized near a particular rational surface. In the other they are the so-called ballooning modes that extend over many rational surfaces. Using a model that represents both drift waves and resistive interchanges the transition from one of these structures to the other is investigated. In this simplified model the transition depends on a single parameter which embodies the competition between toroidal coupling of Fourier modes (which enhances ballooning) and variation in frequency of Fourier modes from one rational surface to another (which diminishes ballooning). As the coupling is increased each Fourier mode acquires a sideband on an adjacent rational surface and these sidebands then expand across the radius to form the extended mode described by the conventional ballooning mode approximation. This analysis shows that the ballooning approximation is appropriate for drift waves in a tokamak but not for resistive interchanges in a pinch. In the latter the conventional ballooning effect is negligible but they may nevertheless show a ballooning feature. This is localized near the same rational surface as the primary Fourier mode and so does not lead to a radially extended structure

  7. Change in dynamic visual acuity (DVA) by pupil dilation.

    Science.gov (United States)

    Ueda, Tetsuo; Nawa, Yoshiaki; Yukawa, Eiichi; Taketani, Futoshi; Hara, Yoshiaki

    2006-01-01

    This study was conducted to assess dynamic visual acuity (DVA) under pupil dilation. Pupil dilation may negatively affect driving performance. Thirty healthy young adults (mean age 29.4 years) with pupil dilation participated in this study as the Mydrin P group. In addition to them, 15 healthy young adults (mean age 28.5 years) without pupil dilation were enrolled as the control group. DVA was measured binocularly with free-head viewing at 0, 30, 60, 120, and 360 min after mydriatic drop instillation in both eyes. Pupil size was measured at each time. In the Mydrin P group, DVA significantly improved at 30, 60, and 120 min (ANOVA; p DVA did not significantly change at all measured times (ANOVA; p > .9). DVA was significantly (p DVA was related to the enlargement of the pupil. This study suggests that the pupil size is one factor that may affect DVA. Potential applications of this study include useful information to assess the effect of pupil dilation on driving performance.

  8. Exploring Biological Motion Processing in Parkinson's Disease Using Temporal Dilation.

    Directory of Open Access Journals (Sweden)

    Ruihua Cao

    Full Text Available Biological motion (BM perception is the compelling ability of the visual system to perceive complex animated movements effortlessly and promptly. A recent study has shown that BM can automatically lengthen perceived temporal duration independent of global configuration. The present study aimed mainly to investigate this temporal dilation effect of BM signals in Parkinson's disease (PD patients. We used the temporal dilation effect as an implicit measure of visual processing of BM. In all, 32 PD patients (under off-therapy conditions and 32 healthy controls (HCs participated in our study. In each trial, an upright BM sequence and an inverted BM sequence were presented within an interval in the center of the screen. We tested both canonical and scrambled BM sequences; the scrambled ones were generated by disturbing the global configuration of the canonical ones but preserving exactly the same local motion components. Observers were required to make a verbal two-alternative forced choice response to indicate which interval (the first or the second appeared longer. Statistical analyses were conducted on the points of subjective equality (PSEs. We found that the temporal dilation effect was significantly reduced for PD patients compared with HCs in both canonical and scrambled BM conditions. Moreover, no temporal dilation effects of scrambled BM were shown in both early- and late-stage PD patients, while the temporal dilation effect of canonical BM was relatively preserved in the early stages.

  9. N-dependence of ballooning instabilities

    International Nuclear Information System (INIS)

    Dewar, R.L.; Manickam, J.; Grimm, R.C.; Chance, M.S.

    1980-05-01

    The critical β for stability against ideal hydromagnetic internal ballooning modes as a function of toroidal mode number, n, is calculated for two different equilibrium sequences by use of a finite element technique (n less than or equal to 20), and a WKB formalism (n greater than or equal to 5). The agreement between the two methods is good in the overlap region 5 approx.less than or equal to n approx. less than or equal to 20. The WKB formula reduces to the 1/n correction at very high n, but is much more accurate at moderate n. The critical β vs n curves exhibit oscillatory structure at low n, but in both sequences the lower bound on β/sub c/ approx. 5%. For reactor parameters, finite Larmor radius effects are not expected to have a large effect on this β-limitation

  10. Management of intra-aortic balloon pumps.

    Science.gov (United States)

    Webb, Christopher A-J; Weyker, Paul D; Flynn, Brigid C

    2015-06-01

    Intra-aortic balloon pumps (IABPs) continue to be the most widely used cardiac support devices with an annual estimate of 200 000 IABPs placed worldwide. IABPs enhance myocardial function by maximizing oxygen supply and minimizing oxygen demand. The use of IABPs is not without risk, with major vascular injury, ischemia, and infection being the most common complications, especially in high-risk patients. While recent studies have questioned the use of IABPs in patients with cardiogenic shock secondary to myocardial infarction, these studies have limitations making it difficult to formulate definitive conclusions. This review will focus on the mechanisms of counterpulsation, the management of IABPs and the evidence supporting this ventricular support therapy. © The Author(s) 2014.

  11. High Energy Antimatter Telescope (HEAT) Balloon Experiment

    Science.gov (United States)

    Beatty, J. J.

    1995-01-01

    This grant supported our work on the High Energy Antimatter Telescope(HEAT) balloon experiment. The HEAT payload is designed to perform a series of experiments focusing on the cosmic ray positron, electron, and antiprotons. Thus far two flights of the HEAT -e+/- configuration have taken place. During the period of this grant major accomplishments included the following: (1) Publication of the first results of the 1994 HEAT-e+/- flight in Physical Review Letters; (2) Successful reflight of the HEAT-e+/- payload from Lynn Lake in August 1995; (3) Repair and refurbishment of the elements of the HEAT payload damaged during the landing following the 1995 flight; and (4) Upgrade of the ground support equipment for future flights of the HEAT payload.

  12. Drug-eluting balloon in peripheral intervention for the superficial femoral artery: the DEBATE-SFA randomized trial (drug eluting balloon in peripheral intervention for the superficial femoral artery).

    Science.gov (United States)

    Liistro, Francesco; Grotti, Simone; Porto, Italo; Angioli, Paolo; Ricci, Lucia; Ducci, Kenneth; Falsini, Giovanni; Ventoruzzo, Giorgio; Turini, Filippo; Bellandi, Guido; Bolognese, Leonardo

    2013-12-01

    This study sought to compare paclitaxel-eluting balloon (PEB) with conventional percutaneous transluminal angioplasty (PTA), followed by systematic implantation of a self-expanding nitinol bare-metal stent (BMS) in patients at risk for restenosis. PTA is an effective strategy for treating atherosclerosis of the femoropopliteal axis (FPA). Whereas PEB have shown advantage over uncoated balloons in the treatment of simple lesions, it is unknown whether these results are applicable to complex degrees of FPA atheroma. A total of 104 patients (110 FPA lesions in 110 limbs) were randomly assigned to either PEB + BMS or PTA + BMS. The primary endpoint was 12-month binary restenosis. Secondary endpoints were freedom from target lesion revascularization and major amputation. Post hoc subanalyses were performed for the comparison of long (≥100 mm) versus short lesions and true lumen versus subintimal approach. Mean lesion length was 94 ± 60 versus 96 ± 69 mm in the PEB + BMS and PTA + BMS groups (p = 0.8), respectively. The primary endpoint occurred in 9 (17%) versus 26 (47.3%) of lesions in the PEB + BMS and PTA + BMS groups (p = 0.008), respectively. A near-significant (p = 0.07) 1-year freedom from target lesion revascularization advantage was observed in the PEB + BMS group. No major amputation occurred. No significant difference was observed according to lesion characteristics or technical approach. Pre-dilation with PEB angioplasty prior to BMS implantation, as compared to PTA + BMS in complex FPA lesions, reduces restenosis and target lesion revascularization at 12-month follow-up. Restenosis reduction is maintained irrespective of lesion length and recanalization technique. (Drug Eluting Balloon in Peripheral Intervention for the Superficial Femoral Artery [DEBATE-SFA]; NCT01556542). Copyright © 2013 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.

  13. The MIPAS balloon borne trace constitutent experiment

    Science.gov (United States)

    Oelhaf, H.; Vonclarmann, TH.; Fischer, H.; Friedl-Vallon, F.; Fritzsche, CHR.; Piesch, CHR.; Rabus, D.; Seefeldner, M.; Voelker, W.

    1994-01-01

    A novel cryogenic Fourier transform spectrometer (FTS) has been developed for limb emission measurements in the mid IR-region from balloon-borne platforms. The FTS is a rapid scanning interferometer using a modified Michelson arrangement which allows a spectral resolution of 0.04 cm(exp -1) to be achieved. Solid carbon-dioxide cooling of the spectrometer and liquid-helium cooling of the detectors provide adequate sensitivity. The line of sight can be stabilized in terms of azimuth and elevation. A three-mirror off-axis telescope provides good vertical resolution and straylight rejection. Calibration is performed by high elevation and internal blackbody measurements. Four balloon flights were performed, two of them during spring turn-around 1989 and 1990 over mid-latitudes (Aire sur L'Adour, France, 44 deg N) and two near the northern polar circle in winter 1992 (Esrange, Sweden, 68 deg N). Limb emission spectra were collected from 32 km to 39 km floating altitudes covering tangent heights between the lower troposphere and the floating altitude. The trace gases CO2, H2O, O3, CH4, N2O, HNO3, N2O5, ClONO2, CF2Cl2, CFCl3, CHF2Cl, CCl4, and C2H6 have been identified in the measured spectra. The 1989 data have been analyzed to retrieve profiles of O3, HNO3, CFCl3 and CF2Cl2. The flights over Kiruna have provided the first ever reported profile measurements of the key reservoir species ClONO2 and N2O5 inside the polar vortex.

  14. An investigation of electrostatically deposited radionuclides on latex balloons

    International Nuclear Information System (INIS)

    Price, T.; Caly, A.

    2012-01-01

    Use of Canadian Nuclear Society (CNS) education material for a community science education event to promote science awareness, science culture and literacy (Science Rendezvous 2011) lead to investigation of observed phenomena. Experiments are done on balloons that are electrostatically charged then left to collect particulate. Alpha spectroscopy was performed to identify alpha emitting radioisotopes present on the balloons. The time dependent behaviour of the activity was investigated. Additionally, the Alpha activity of the balloon was compared to Beta activity. The grounds for further investigations are proposed. (author)

  15. A Retrospective Evaluation of the Utility of Capsule Endoscopy and Double-Balloon Endoscopy in Crohn’s Disease

    Directory of Open Access Journals (Sweden)

    Masanao Nakamura

    2016-01-01

    Full Text Available Background. Although the usefulness of capsule endoscopy (CE and double-balloon endoscopy (DBE for the evaluation of Crohn’s disease (CD is established, their capabilities in the differential diagnosis of small bowel stenosis have not been sufficiently addressed. The present study therefore aimed to retrospectively determine the types of patients for whom CE and DBE would confer the most benefit. Patients and Methods. We retrospectively reviewed data from 185 patients with established CD. A change of treatment based on CE or DBE results or successful DBE balloon dilation was defined as clinically useful indication. We then analyzed the factors significantly related to useful and poor indications. Results. CE results were assessed as useful indications in 28 (45% of 62 patients. Multivariate analysis demonstrated that positive CRP and low IOIBD score are factors significantly related to a useful indication. DBE results were recognized as useful indications in 118 (77% of 153 patients. Multivariate analysis indicated small bowel stenosis and abdominal pain as factors significantly associated with useful indications. All patients with a poor indication on CE had small bowel stenosis. Conclusions. CE was most useful for patients in clinical remission with positive CRP and without stenosis, whereas DBE was useful for patients with symptoms of stenosis.

  16. H∞ /H2 model reduction through dilated linear matrix inequalities

    DEFF Research Database (Denmark)

    Adegas, Fabiano Daher; Stoustrup, Jakob

    2012-01-01

    This paper presents sufficient dilated linear matrix inequalities (LMI) conditions to the $H_{infty}$ and $H_{2}$ model reduction problem. A special structure of the auxiliary (slack) variables allows the original model of order $n$ to be reduced to an order $r=n/s$ where $n,r,s in field{N}$. Arb......This paper presents sufficient dilated linear matrix inequalities (LMI) conditions to the $H_{infty}$ and $H_{2}$ model reduction problem. A special structure of the auxiliary (slack) variables allows the original model of order $n$ to be reduced to an order $r=n/s$ where $n,r,s in field...... not satisfactorily approximates the original system, an iterative algorithm based on dilated LMIs is proposed to significantly improve the approximation bound. The effectiveness of the method is accessed by numerical experiments. The method is also applied to the $H_2$ order reduction of a flexible wind turbine...

  17. Pulmonary artery dilatation: an overlooked mechanism for angina pectoris.

    Science.gov (United States)

    Ginghina, Carmen; Popescu, Bogdan A; Enache, Roxana; Ungureanu, Catalina; Deleanu, Dan; Platon, Pavel

    2008-07-01

    Dilatation of the pulmonary artery may lead to the compression of adjacent structures. Of those, the extrinsic compression of the left main coronary artery is the most worrisome. We present the case of a 48-year-old woman who was diagnosed with pulmonary artery dilatation due to severe, thromboembolic pulmonary hypertension. She also had angina and coronary angiography revealed a 70% ostial stenosis of the left main coronary artery. The presence of this isolated lesion in a young woman without risk factors for atherosclerosis suggests extrinsic compression of the left main coronary artery by the dilated pulmonary artery as the likely mechanism. The patient underwent direct stenting of the left main coronary stenosis with a good result.

  18. Dilatancy and compaction effects on the submerged granular column collapse

    Science.gov (United States)

    Wang, Chun; Wang, Yongqi; Peng, Chong; Meng, Xiannan

    2017-10-01

    The effects of dilatancy on the collapse dynamics of granular materials in air or in a liquid are studied experimentally and numerically. Experiments show that dilatancy has a critical effect on the collapse of granular columns in the presence of an ambient fluid. Two regimes of the collapse, one being quick and the other being slow, are observed from the experiments and the underlying reasons are analyzed. A two-fluid smoothed particle hydrodynamics model, based on the granular-fluid mixture theory and the critical state theory, is employed to investigate the complex interactions between the solid particles and the ambient water. It is found that dilatancy, resulting in large effective stress and large frictional coefficient between solid particles, helps form the slow regime. Small permeability, representing large inter-phase drag force, also retards the collapse significantly. The proposed numerical model is capable of reproducing these effects qualitatively.

  19. Development of a New Coaxial Balloon Catheter System for Balloon-Occluded Retrograde Transvenous Obliteration (B-RTO)

    International Nuclear Information System (INIS)

    Tanoue, Shuichi; Kiyosue, Hiro; Matsumoto, Shunro; Hori, Yuzo; Okahara, Mika; Kashiwagi, Junji; Mori, Hiromu

    2006-01-01

    Purpose. To develop a new coaxial balloon catheter system and evaluate its clinical feasibility for balloon-occluded retrograde transvenous obliteration (B-RTO). Methods. A coaxial balloon catheter system was constructed with 9 Fr guiding balloon catheter and 5 Fr balloon catheter. A 5 Fr catheter has a high flexibility and can be coaxially inserted into the guiding catheter in advance. The catheter balloons are made of natural rubber and can be inflated to 2 cm (guiding) and 1 cm (5 Fr) maximum diameter. Between July 2003 and April 2005, 8 consecutive patients (6 men, 2 women; age range 33-72 years, mean age 55.5 years) underwent B-RTO using the balloon catheter system. Five percent ethanolamine oleate iopamidol (EOI) was used as sclerosing agent. The procedures, including maneuverability of the catheter, amount of injected sclerosing agent, necessity for coil embolization of collateral draining veins, and initial clinical results, were evaluated retrospectively. The occlusion rate was assessed by postcontrast CT within 2 weeks after B-RTO. Results. The balloon catheter could be advanced into the proximal potion of the gastrorenal shunt beyond the collateral draining vein in all cases. The amount of injected EOI ranged from 3 to 34 ml. Coil embolization of the collateral draining vein was required in 2 cases. Complete obliteration of gastric varices on initial follow-up CT was obtained in 7 cases. The remaining case required re-treatment that resulted in complete obstruction of the varices after the second B-RTO. No procedure-related complications were observed. Conclusion. B-RTO using the new coaxial balloon catheter is feasible. Gastric varices can be treated more simply by using this catheter system

  20. Shared Genetic Predisposition in Peripartum and Dilated Cardiomyopathies.

    Science.gov (United States)

    Ware, James S; Li, Jian; Mazaika, Erica; Yasso, Christopher M; DeSouza, Tiffany; Cappola, Thomas P; Tsai, Emily J; Hilfiker-Kleiner, Denise; Kamiya, Chizuko A; Mazzarotto, Francesco; Cook, Stuart A; Halder, Indrani; Prasad, Sanjay K; Pisarcik, Jessica; Hanley-Yanez, Karen; Alharethi, Rami; Damp, Julie; Hsich, Eileen; Elkayam, Uri; Sheppard, Richard; Kealey, Angela; Alexis, Jeffrey; Ramani, Gautam; Safirstein, Jordan; Boehmer, John; Pauly, Daniel F; Wittstein, Ilan S; Thohan, Vinay; Zucker, Mark J; Liu, Peter; Gorcsan, John; McNamara, Dennis M; Seidman, Christine E; Seidman, Jonathan G; Arany, Zoltan

    2016-01-21

    Background Peripartum cardiomyopathy shares some clinical features with idiopathic dilated cardiomyopathy, a disorder caused by mutations in more than 40 genes, including TTN, which encodes the sarcomere protein titin. Methods In 172 women with peripartum cardiomyopathy, we sequenced 43 genes with variants that have been associated with dilated cardiomyopathy. We compared the prevalence of different variant types (nonsense, frameshift, and splicing) in these women with the prevalence of such variants in persons with dilated cardiomyopathy and with population controls. Results We identified 26 distinct, rare truncating variants in eight genes among women with peripartum cardiomyopathy. The prevalence of truncating variants (26 in 172 [15%]) was significantly higher than that in a reference population of 60,706 persons (4.7%, P=1.3×10(-7)) but was similar to that in a cohort of patients with dilated cardiomyopathy (55 of 332 patients [17%], P=0.81). Two thirds of identified truncating variants were in TTN, as seen in 10% of the patients and in 1.4% of the reference population (P=2.7×10(-10)); almost all TTN variants were located in the titin A-band. Seven of the TTN truncating variants were previously reported in patients with idiopathic dilated cardiomyopathy. In a clinically well-characterized cohort of 83 women with peripartum cardiomyopathy, the presence of TTN truncating variants was significantly correlated with a lower ejection fraction at 1-year follow-up (P=0.005). Conclusions The distribution of truncating variants in a large series of women with peripartum cardiomyopathy was remarkably similar to that found in patients with idiopathic dilated cardiomyopathy. TTN truncating variants were the most prevalent genetic predisposition in each disorder.

  1. Passive urethral resistance to dilation in healthy women

    DEFF Research Database (Denmark)

    Bagi, P; Thind, P; Nordsten, M

    1995-01-01

    The dynamic urethral pressure response to a simulated urine ingression was studied at the bladder neck, in the high pressure zone, and in the distal urethra in 10 healthy female volunteers. The pressure response was characterised by a steep pressure increase simulataneous with the urethral dilation...... at equilibrium, P alpha and P beta express the decline in pressure, and tau alpha and tau beta are time constants. The size of the pressure response proved highly dependent on velocity and size of dilation as well as urethral site of measurement, with the maximum values in the high pressure zone. The time...

  2. Improved test of time dilation in special relativity.

    Science.gov (United States)

    Saathoff, G; Karpuk, S; Eisenbarth, U; Huber, G; Krohn, S; Muñoz Horta, R; Reinhardt, S; Schwalm, D; Wolf, A; Gwinner, G

    2003-11-07

    An improved test of time dilation in special relativity has been performed using laser spectroscopy on fast ions at the heavy-ion storage-ring TSR in Heidelberg. The Doppler-shifted frequencies of a two-level transition in 7Li+ ions at v=0.064c have been measured in the forward and backward direction to an accuracy of Deltanu/nu=1 x 10(-9) using collinear saturation spectroscopy. The result confirms the relativistic Doppler formula and sets a new limit of 2.2 x 10(-7) for deviations from the time dilation factor gamma(SR)=(1-v2/c2)(-1/2).

  3. A Rare Occurance with Epidermolysis Bullosa Disease: Dilated Cardiomyopathy

    Directory of Open Access Journals (Sweden)

    Derya Cimen

    2014-02-01

    Full Text Available Epidermolysis bullosa is a congenital and herediter vesiculobullous disease. Dystrophic form of this disease is characterized by severe malnutrition, failure to thrive, adhesions at fingers, joint contractures related with the formation of scar tissues, carcinoma of the skin, anemia, hipoalbuminemia, wound enfections and sepsis. Rarely, mortal dilated cardiomyopathy may occur in patients. In this report we present a 13 year-old pediatric patient with dilated cardiomyopathy, clinically diagnosed with Epidermolysis bullosa as well as a review of recent related literature.

  4. OCT evaluation of directional atherectomy compared to balloon angioplasty

    Energy Technology Data Exchange (ETDEWEB)

    Marmagkiolis, Konstantinos [Citizens Memorial Hospital Heart and Vascular Institute, Bolivar, MO (United States); Lendel, Vasili [Arkansas Heart Hospital, Peripheral Vascular Institute, Little Rock, AR (United States); Cilingiroglu, Mehmet, E-mail: mcilingiroglu@yahoo.com [Arkansas Heart Hospital, Peripheral Vascular Institute, Little Rock, AR (United States); Koc University, School of Medicine, Istanbul (Turkey)

    2015-09-15

    Directional atherectomy (DA) is one of the most commonly used modalities for the treatment of obstructive femoropopliteal peripheral arterial disease (PAD), especially in patients with large and calcified atherosclerotic plaques. The effect of directional atherectomy to the vascular wall compared to balloon angioplasty by optical coherence tomography (OCT) has not been previously described. We present the first case of OCT after directional atherectomy with SilverHawk followed by angiosculpt balloon angioplasty. - Highlights: • Directional atherectomy avoids the vascular mechanical damage caused by angioplasty balloons and the exposure of stent struts or the potential of stent fracture with stents. • OCT can accurately assess the effect of endovacular interventions to the vessel wall. • Although angiographic results after directional atherectomy are acceptable, OCT use demonstrated suboptimal improvement of the MLA requiring additional balloon angioplasty. • Longer studies are needed to define whether the improved OCT results with angioplasty compared to DA may offer better clinical outcomes.

  5. Remote sensing and sensor testing via hot air balloons

    Energy Technology Data Exchange (ETDEWEB)

    Watson, S.M. [Univ. of Utah, Salt Lake City, UT (United States); Kroutil, R.T. [Army Edgewood Research, Development and Engineering Center, Aberdeen Proving Ground, MD (United States); Traynor, C.A. [DARPA High Performance Computing Applications, Arlington, VA (United States)] [and others

    1996-11-01

    Tethered and free-flying manned hot air balloons have been demonstrated as platforms for various remote sensing asks and sensor testing and atmospheric measurements. These platforms are inexpensive to operate, do not cause atmospheric disturbances as do higher speed platforms, and are extremely stable and free of vibrations inherent in aircraft structures. The equipment operated and tested on the balloons in connection with this project includes a prototype multispectral imaging spectrometer, high resolution CCD cameras, mid- and far-infrared cameras, a radiometer, FTIR spectrometers, video recording equipment and portable power generators carried beneath the balloon providing power to the equipment The experiments conducted on and from the balloon include chemical effluents characterization, atmospheric propagation through slant paths, obscurants imaging and scene reflectance. 7 refs.

  6. Development of Venus Balloon Seismology Missions Through Earth Analog Experiments

    Science.gov (United States)

    Krishnamoorthy, S.; Komjathy, A.; Cutts, J. A.; Pauken, M. T.; Garcia, R. F.; Mimoun, D.; Jackson, J. M.; Kedar, S.; Smrekar, S. E.; Hall, J. L.

    2017-11-01

    The study of a planet’s seismic activity is central to the understanding of its internal structure. We discuss advances made through Earth analog testing for performing remote seismology on Venus using balloons floated in the mid-atmosphere.

  7. Stabilization of ballooning modes with sheared toroidal rotation

    International Nuclear Information System (INIS)

    Miller, R.L.; Waelbroeck, F.L.; Hassam, A.B.; Waltz, R.E.

    1995-01-01

    Stabilization of magnetohydrodynamic ballooning modes by sheared toroidal rotation is demonstrated using a shifted circle equilibrium model. A generalized ballooning mode representation is used to eliminate the fast Alfven wave, and an initial value code solves the resulting equations. The s-α diagram (magnetic shear versus pressure gradient) of ballooning mode theory is extended to include rotational shear. In the ballooning representation, the modes shift periodically along the field line to the next point of unfavorable curvature. The shift frequency (dΩ/dq, where Ω is the angular toroidal velocity and q is the safety factor) is proportional to the rotation shear and inversely proportional to the magnetic shear. Stability improves with increasing shift frequency and direct stable access to the second stability regime occurs when this frequency is approximately one-quarter to one-half the Alfven frequency, ω A =V A /qR. copyright 1995 American Institute of Physics

  8. SMEX02 Balloon-borne Radiosonde Data, Iowa, Version 1

    Data.gov (United States)

    National Aeronautics and Space Administration — This data set includes radiosonde measurements of upper air temperature and pressure, relative humidity, and wind direction and speed during the balloons' ascent to...

  9. Design Evolution and Methodology for Pumpkin Super-Pressure Balloons

    Science.gov (United States)

    Farley, Rodger

    The NASA Ultra Long Duration Balloon (ULDB) program has had many technical development issues discovered and solved along its road to success as a new vehicle. It has the promise of being a sub-satellite, a means to launch up to 2700 kg to 33.5 km altitude for 100 days from a comfortable mid-latitude launch point. Current high-lift long duration ballooning is accomplished out of Antarctica with zero-pressure balloons, which cannot cope with the rigors of diurnal cycles. The ULDB design is still evolving, the product of intense analytical effort, scaled testing, improved manufacturing, and engineering intuition. The past technical problems, in particular the s-cleft deformation, their solutions, future challenges, and the methodology of pumpkin balloon design will generally be described.

  10. A battery-operated pilot balloon time-signal generator

    Science.gov (United States)

    Ralph H. Moltzau

    1966-01-01

    Describes the design and construction of a 1-pound, battery-operated, time-signal transmitter, which is usable with portable radio or field telephone circuits for synchronizing multi-theodolite observation of pilot balloons.

  11. Balloon valvuloplasty for severe mitral valve stenosis in pregnancy

    African Journals Online (AJOL)

    . Commerford, B. Levetan. Balloon Valvuloplasties for severe mitral stenosis were performed on 11 ... 140 patients each year with cardiac disease - an incidence of 0.5%. ... Department of Medicine, Groote Schuur Hospital and University of.

  12. Ballooning stability analysis of JET H-mode discharges

    International Nuclear Information System (INIS)

    O'Brien, D.P.; Galvao, R.; Keilhacker, M.; Lazzaro, E.; Watkins, M.L.

    1989-01-01

    Previous studies of the stability of a large aspect ratio model equilibrium to ideal MHD ballooning modes have shown that across the bulk of the plasma there exist two marginally stable values of the pressure gradient parameter α. These define an unstable zone which separates the first (small α) stable region from the second (large α) stable region. Close to the separatrix, however, the first and second regions can coalesce when the surface averaged current density, Λ, exceeds a critical value. The plasma in this region is then stable to ballooning modes at all values of the pressure gradient. In this paper we extend these results to JET H-mode equilibria using a finite aspect ratio ballooning formalism, and assess the relevance of ideal ballooning stability in these discharges. In particular we analyse shot 15894 at time 56 sec. which is 1.3 s into the H-phase. (author) 4 refs., 4 figs

  13. 10 meter Sub-Orbital Large Balloon Reflector (LBR)

    Data.gov (United States)

    National Aeronautics and Space Administration — This is the lead NIAC Phase II proposal for “10 meter Sub-Orbital Large Balloon Reflector (LBR)” with Christopher K. Walker as PI. We propose to develop and...

  14. SMEX02 Balloon-borne Radiosonde Data, Iowa

    Data.gov (United States)

    National Aeronautics and Space Administration — This data set includes radiosonde measurements of upper air temperature and pressure, relative humidity, and wind direction and speed during the balloons' ascent to...

  15. Ideal ballooning stability near an equilibrium magnetic island

    Energy Technology Data Exchange (ETDEWEB)

    Hegna, C.C.; Callen, J.D.

    1992-03-01

    The stability properties of ideal ballooning modes on toroidal flux surfaces near a quasistatic magnetic island is examined. On these surfaces, magnetic field-line trajectories tend to bunch on that part of the magnetic surface closet to the X-point of the magnetic island. Because of this preferential bunching, the stabilizing effect of field-line bending due to magnetic shear can be reduced. Eigenfunctions localized in helical angle near the X-point and in poloidal angle on the bad curvature side of the tokamak are more susceptible to ballooning instability than are modes in corresponding equilibria without the magnetic island. For a slowly growing island, a growing number of flux surfaces located near the separatrix become ballooning unstable. Secondary ballooning instabilities may play a part in the crash phase of sawteeth or macroscopic island dynamics.

  16. Dilated uropathies in children; Dilatation des reins et voies urinaires chez l`enfant

    Energy Technology Data Exchange (ETDEWEB)

    Bouissou, F. [Centre Hospitalier Universitaire Purpan, 31 - Toulouse (France)

    1995-12-31

    These uropathies are frequent in children and are often diagnosed by ante-natal ultrasound examination. The dilatation, hydronephrosis or uretero-hydro-nephrosis may be due to a large pattern of malformations, either anatomical dysplasia, vesico-ureteric reflux or obstruction of the pelvi-ureteric junction, of the vesical-ureteric junction or due to a chronic urethral obstruction. The investigations must determine the exact urinary tract abnormalities, the renal function and the uro-dynamic change. They are guided by the ultrasound findings and cystography. In obstructive malformation, the MAG3 renogram with furosemide test is the best way to precise the uro-dynamic status, but it requires a careful technique in children and its interpretation is sometimes equivocal. DMSA scan is very useful to give precise separate kidney function and to follow the maturational change with age. All the results must be carefully analysed ; the final therapeutic decision and specially surgery is dependent of the type of uropathy and its natural history. In many cases, surgical treatment is only indicated after a longer follow-up and repeated evaluations. (authors). 11 refs., 2 figs.

  17. Properties of ballooning modes in the Heliotron configurations

    International Nuclear Information System (INIS)

    Nakajima, N.; Hudson, S.R.; Hegna, C.C.

    2005-01-01

    The stability of ballooning modes is influenced by the local and global magnetic shear and local and global magnetic curvature so significantly that it is fairly difficult to get those general properties in the three dimensional configurations with strong flexibility due to the external coil system. In the case of the planar axis heliotron configurations allowing a large Shafranov shift, like LHD, properties of the high-mode-number ballooning modes have been intensively investigated. It has been analytically shown that the local magnetic shear comes to disappear in the stellarator-like global magnetic shear region, as the Shafranov shift becomes large. Based on this mechanism and the characteristics of the local and global magnetic curvature, it is numerically shown that the destabilized ballooning modes have strong three-dimensional properties (both poloidal and toroidal mode couplings) in the Mercier stable region, and that those are fairly similar to ballooning modes in the axisymmetric system in the Mercier unstable region. As is well known, however, no quantization condition is applicable to the ballooning modes in the three-dimensional system without symmetry, and so the results of the high-mode-number ballooning modes in the covering space had to be confirmed in the real space. Such a confirmation has been done in the Mercier stable region and also in the Mercier unstable region by using three dimensional linearized ideal MHD stability code cas3d. Confirming the relation between high-mode-number ballooning analyses by the global mode analyses, the method of the equilibrium profile variations has been developed in the tree dimensional system, giving dt/dψ - dP/dψ stability diagram corresponding to the s - α diagram in tokamaks. This method of profile variation are very powerful to investigate the second stability of high-mode-number ballooning modes and has been more developed. Recently it has been applied to the plasma in the inward-shifted LHD

  18. Overview of the Scientific Balloon Activity in Sweden

    Science.gov (United States)

    Abrahamsson, Mattias; Kemi, Stig; Lockowandt, Christian; Andersson, Kent

    SSC, formerly known as Swedish Space Corporation, is a Swedish state-owned company working in several different space related fields, including scientific stratospheric balloon launches. Esrange Space Centre (Esrange in short) located in the north of Sweden is the launch facility of SSC, where both sounding rocket launches and stratospheric balloon launches are conducted. At Esrange there are also facilities for satellite communication, including one of the largest civilian satellite data reception stations in the world. Stratospheric balloons have been launched from Esrange since 1974, when the first flights were performed together with the French space agency CNES. These balloon flights have normally flown eastward either only over Sweden or into Finland. Some flights have also had permission to fly into Russia, as far as the Ural Mountains. Normal flight times are from 4 to 12 hours. These eastward flights are conducted during the winter months (September to May). Long duration flights have been flown from ESC since 2005, when NASA flew the BLAST payload from Sweden to north Canada. The prevailing westerly wind pattern is very advantageous for trans-Atlantic flights during summer (late May to late July). The long flight times are very beneficial for astronomical payloads, such as telescopes that need long observation times. In 2013 two such payloads were flown, the first called SUNRISE was a German/US solar telescope, and the other called PoGOLite with a Swedish gamma-ray telescope. In 14 days PoGOLite, which had permission to fly over Russia, made an almost complete circumpolar flight. Typical scientific balloon payload fields include atmospheric research, including research on ozone depletion, astronomical and cosmological research, and research in technical fields such as aerodynamics. University students from all over Europe are involved in flights from Esrange under a Swedish/German programme called BEXUS. Two stratospheric balloons are flown with student

  19. Ballooning Stability of the Compact Quasiaxially Symmetric Stellarator

    International Nuclear Information System (INIS)

    Redi, M.H.; Canik, J.; Dewar, R.L.; Johnson, J.L.; Klasky, S.; Cooper, W.A.; Kerbichler, W.

    2001-01-01

    The magnetohydrodynamic (MHD) ballooning stability of a compact, quasiaxially symmetric stellarator (QAS), expected to achieve good stability and particle confinement is examined with a method that can lead to estimates of global stability. Making use of fully 3D, ideal-MHD stability codes, the QAS beta is predicted to be limited above 4% by ballooning and high-n kink modes. Here MHD stability is analyzed through the calculation and examination of the ballooning mode eigenvalue isosurfaces in the 3-space [s, alpha, theta(subscript ''k'')]; s is the edge normalized toroidal flux, alpha is the field line variable, and theta(subscript ''k'') is the perpendicular wave vector or ballooning parameter. Broken symmetry, i.e., deviations from axisymmetry, in the stellarator magnetic field geometry causes localization of the ballooning mode eigenfunction, with new types of nonsymmetric, eigenvalue isosurfaces in both the stable and unstable spectrum. The isosurfaces around the most unstable points i n parameter space (well above marginal) are topologically spherical. In such cases, attempts to use ray tracing to construct global ballooning modes lead to a k-space runaway. Introduction of a reflecting cutoff in k(perpendicular) to model numerical truncation or finite Larmor radius (FLR) yields chaotic ray paths ergodically filling the allowed phase space, indicating that the global spectrum must be described using the language of quantum chaos theory. However, the isosurface for marginal stability in the cases studied are found to have a more complex topology, making estimation of FLR stabilization more difficult

  20. Shock wave therapy effectively attenuates inflammation in rat carotid artery following endothelial denudation by balloon catheter.

    Science.gov (United States)

    Shao, Pei-Lin; Chiu, Chaw-Chi; Yuen, Chun-Man; Chua, Sarah; Chang, Li-Teh; Sheu, Jiunn-Jye; Sun, Cheuk-Kwan; Wu, Chiung-Jen; Wang, Ching-Jen; Yip, Hon-Kan

    2010-01-01

    This study investigates the effectiveness of extracorporeal shock wave (ECSW) in ameliorating inflammatory mediator expression and neointimal formation in a rat model of vascular injury. Male Sprague-Dawley rats with left carotid artery (LCA) injury induced by balloon dilatation (BD; group 1) were compared with group 2 [LCA injury plus ECSW-181 (defined as 181 total shocks given in LCA at 0.011 mJ/mm(2)) on day 2 post-LCA injury], and group 3 (normal controls). The rats in each group were further divided into 3 subgroups (n = 6, each) that were sacrificed on postoperative day 3, 7 and 14, respectively. The results demonstrated that, compared to groups 2 and 3, group 1 had significantly increased cellular expression of CD40, interleukin-18, and connexin 43 at each analyzed time point (all p LCA neointimal proliferation and media thickness were markedly higher in group 1 than in groups 2 and 3 on days 7 and 14 post-BD (all p injury model.

  1. Case Report Percutaneous Dilational Tracheostomy A bed side ...

    African Journals Online (AJOL)

    Introduction: Tracheostomy is one of the most commonly performed procedures in critically ill patients. Percutaneous dilatational tracheostomy (PDT), according to ciaglias technique described in 1985, has become the most popular technique for percutaneous tracheostomy and is demonstrably as safe as surgical.

  2. Cervical ripening with prostaglandin gel and hygroscopic dilators.

    Science.gov (United States)

    Hibbard, J U; Shashoua, A; Adamczyk, C; Ismail, M

    1998-01-01

    OBJECTIVE: To study the effectiveness and morbidity of adding hygroscopic cervical dilators to prostaglandin gel for cervical ripening and labor induction. STUDY DESIGN: Patients of at least 34 weeks' gestation with a medical indication for induction of labor and with a modified Bishop score of 5 or less were randomized to receive either prostaglandin gel or prostaglandin gel with hygroscopic cervical dilators. Primary outcomes were time to delivery, change in cervical score, and infection. Secondary outcomes included cesarean delivery rate and deliveries before 24 hours of induction. Continuous variables were analyzed by Wilcoxon sum rank test and categorical data by chi-square or Fisher exact test, with P intracervical prostaglandin alone and 23 patients received intracervical prostaglandin plus hygroscopic dilators. No demographic differences were noted between the groups. After six hours of ripening, the combined group achieved a greater change in Bishop score (3.6 vs. 2.1, P = 0.007) and tended to have a shorter induction time (21.7 vs. 26.4 hours, P = 0.085). The combined therapy group had a higher infection rate than the prostaglandin-only group (59% vs. 12%, P = 0.003). CONCLUSION: Combining cervical dilators with prostaglandin gel provides more effective cervical ripening and a more rapid induction to delivery interval than prostaglandin alone but with a significant and prohibitive rate of infection. PMID:9678143

  3. Non-obstructive cecal dilatation and perforation after cesarean section

    DEFF Research Database (Denmark)

    Sperling, Lene; Schantz, A L; Toftager-Larsen, K

    1990-01-01

    A case of non-obstructive cecal dilatation and perforation after cesarean section is reported, with a review of the literature on the diagnosis and management of this entity. Fifteen cases have been described. Attention is called to this rare complication and to the accompanying pseudo...

  4. Gravitational time dilation and length contraction in fields exterior to ...

    African Journals Online (AJOL)

    Here, we use our new metric tensor exterior to a massiv3e oblate spheroid to study the gravitational phenomena of time dilation and length contraction. It turns out most profoundly that, the above phenomena hold good in the gravitational field exterior to an oblate spheroid. We then use the oblate spheroidal Earth to ...

  5. Migraine pain associated with middle cerebral artery dilatation

    DEFF Research Database (Denmark)

    Friberg, L; Olesen, J; Iversen, Helle Klingenberg

    1991-01-01

    returned to normal after treatment with sumatriptan and recovery. Since rCBF in the MCA supply territory was unaffected, the lower velocity can be explained only by dilatation of the MCA. The mean MCA diameter increase was estimated to be 20%. Thus, headache was associated with intracranial large arterial...

  6. unilateral idiopathic dilated episcleral vein with secondary open ...

    African Journals Online (AJOL)

    TAIBAT OTULANA

    Olabisi Onabanjo University, Sagamu, Ogun State. Nigeria. Nigerian Journal of Ophthalmology 2008; 16(1): 20-22. Unilateral Idiopathic Dilated Episcleral Vein with Secondary. Open Angle Glaucoma (Radius–Maumenee Syndrome) in an. African – A case report and literature review. TO Otulana, OO Onabolu, VO Fafiolu.

  7. Pattern of cervical dilatation among parturients in Ilorin, Nigeria

    African Journals Online (AJOL)

    8, July-September, 2009. Pattern of cervical dilatation among parturients in. Ilorin, Nigeria. Munir'deen A. Ijaiya, Abiodun P. Aboyeji, Olurotimi O. Fakeye, Olayinka R. Balogun,. Duum C. Nwachukwu, Moses O. Abiodun. Department of Obstetrics and Gynaecology, University of Ilorin Teaching Hospital, Maternity Hospital ...

  8. Thallium scintigraphy for the prognosis of idiopathic dilated cardiomyopathy

    International Nuclear Information System (INIS)

    Yabe, Toshikazu; Furuno, Takashi; Kitaoka, Hiroaki; Matsumura, Yoshihisa; Yamasaki, Naohito; Doi, Yoshinori

    2002-01-01

    This study evaluated the significance of perfusion defects demonstrated by thallium-201 and age in the prognosis of patients with idiopathic dilated cardiomyopathy. Seventy-four dilated cardiomyopathy patients underwent thallium scintigraphy as well as clinical and hemodynamic examination. Abnormal perfusion defects were present in 23 of 38 patients aged <60 years (61%) and in 26 of 36 elderly patients aged ≥60 years (72%; NS). Univariate analysis showed that such perfusion defects were a significant predictor of cardiac death only in patients aged <60 years (p=0.015). Stepwise discriminant analysis also revealed that perfusion defects were a significant predictor in patients aged <60 years (Wilks' lambda 0.499, chi-square test 20.2, p=0.003). Perfusion defects were not more important than the history of syncope or stroke in elderly dilated cardiomyopathy patients. Twenty-one patients died of disease-related causes during 58±43 months. The five-year survival rate was better in patients aged <60 years without than in those with perfusion defects (100% vs 58.4%, respectively), but not affected in patients aged ≥60 years (66.7% vs 62.2%). Thallium scintigraphy is valuable for the prognosis of patients with dilated cardiomyopathy aged <60 years who are usually candidates for heart transplantation. Absence of thallium perfusion defects may indicate good long-term prognosis. (author)

  9. Gallbladder duplication masquerading as a dilated common bile ...

    African Journals Online (AJOL)

    A duplicate gall bladder was diagnosed at laparoscopy, having been erroneously diagnosed on ultrasonography as a dilated common bile duct with choledocholithiasis. Gallbladder duplication is a congenital abnormality with a rare incidence, occuring in approximately 1 in 4 000 births and 0.020% in al large autopsy ...

  10. Dilatancy of Shear Transformations in a Colloidal Glass

    Science.gov (United States)

    Lu, Y. Z.; Jiang, M. Q.; Lu, X.; Qin, Z. X.; Huang, Y. J.; Shen, J.

    2018-01-01

    Shear transformations, as fundamental rearrangement events operating in local regions, hold the key of plastic flow of amorphous solids. Despite their importance, the dynamic features of shear transformations are far from clear, which is the focus of the present study. Here, we use a colloidal glass under shear as the prototype to directly observe the shear-transformation events in real space. By tracing the colloidal-particle rearrangements, we quantitatively determine two basic properties of shear transformations: local shear strain and dilatation (or free volume). It is revealed that the local free volume undergoes a significantly temporary increase prior to shear transformations, eventually leading to a jump of local shear strain. We clearly demonstrate that shear transformations have no memory of the initial free volume of local regions. Instead, their emergence strongly depends on the dilatancy ability of these local regions, i.e., the dynamic creation of free volume. More specifically, the particles processing the high dilatancy ability directly participate in subsequent shear transformations. These results experimentally enrich Argon's statement about the dilatancy nature of shear transformations and also shed insight into the structural origin of amorphous plasticity.

  11. Arborescent vascular dilatation mimicking Lichtenberg figures from lightning.

    Science.gov (United States)

    Tempark, Therdpong; Iwasaki, Julie; Shwayder, Tor

    2014-01-01

    The clinical presentation of arborizing vascular dilatation can resemble Lichtenberg figures from lightning. Both have a feather-like or ferning pattern. We report an interesting case of pressure-induced vasodilatation (PIV) caused by temporary vascular occlusion from jeans buttons. © 2014 Wiley Periodicals, Inc.

  12. Thallium scintigraphy for the prognosis of idiopathic dilated cardiomyopathy

    Energy Technology Data Exchange (ETDEWEB)

    Yabe, Toshikazu; Furuno, Takashi; Kitaoka, Hiroaki; Matsumura, Yoshihisa; Yamasaki, Naohito; Doi, Yoshinori [Kochi Medical School, Nankoku (Japan)

    2002-11-01

    This study evaluated the significance of perfusion defects demonstrated by thallium-201 and age in the prognosis of patients with idiopathic dilated cardiomyopathy. Seventy-four dilated cardiomyopathy patients underwent thallium scintigraphy as well as clinical and hemodynamic examination. Abnormal perfusion defects were present in 23 of 38 patients aged <60 years (61%) and in 26 of 36 elderly patients aged {>=}60 years (72%; NS). Univariate analysis showed that such perfusion defects were a significant predictor of cardiac death only in patients aged <60 years (p=0.015). Stepwise discriminant analysis also revealed that perfusion defects were a significant predictor in patients aged <60 years (Wilks' lambda 0.499, chi-square test 20.2, p=0.003). Perfusion defects were not more important than the history of syncope or stroke in elderly dilated cardiomyopathy patients. Twenty-one patients died of disease-related causes during 58{+-}43 months. The five-year survival rate was better in patients aged <60 years without than in those with perfusion defects (100% vs 58.4%, respectively), but not affected in patients aged {>=}60 years (66.7% vs 62.2%). Thallium scintigraphy is valuable for the prognosis of patients with dilated cardiomyopathy aged <60 years who are usually candidates for heart transplantation. Absence of thallium perfusion defects may indicate good long-term prognosis. (author)

  13. A predictive model for canine dilated cardiomyopathy—a meta-analysis of Doberman Pinscher data

    Directory of Open Access Journals (Sweden)

    Siobhan Simpson

    2015-03-01

    Full Text Available Dilated cardiomyopathy is a prevalent and often fatal disease in humans and dogs. Indeed dilated cardiomyopathy is the third most common form of cardiac disease in humans, reported to affect approximately 36 individuals per 100,000 individuals. In dogs, dilated cardiomyopathy is the second most common cardiac disease and is most prevalent in the Irish Wolfhound, Doberman Pinscher and Newfoundland breeds. Dilated cardiomyopathy is characterised by ventricular chamber enlargement and systolic dysfunction which often leads to congestive heart failure. Although multiple human loci have been implicated in the pathogenesis of dilated cardiomyopathy, the identified variants are typically associated with rare monogenic forms of dilated cardiomyopathy. The potential for multigenic interactions contributing to human dilated cardiomyopathy remains poorly understood. Consistent with this, several known human dilated cardiomyopathy loci have been excluded as common causes of canine dilated cardiomyopathy, although canine dilated cardiomyopathy resembles the human disease functionally. This suggests additional genetic factors contribute to the dilated cardiomyopathy phenotype.This study represents a meta-analysis of available canine dilated cardiomyopathy genetic datasets with the goal of determining potential multigenic interactions relating the sex chromosome genotype (XX vs. XY with known dilated cardiomyopathy associated loci on chromosome 5 and the PDK4 gene in the incidence and progression of dilated cardiomyopathy. The results show an interaction between known canine dilated cardiomyopathy loci and an unknown X-linked locus. Our study is the first to test a multigenic contribution to dilated cardiomyopathy and suggest a genetic basis for the known sex-disparity in dilated cardiomyopathy outcomes.

  14. Dobutamine Stress Echocardiography in Patients with Dilated Cardiomyopathy

    Directory of Open Access Journals (Sweden)

    Miloradovic Vladimir

    2016-06-01

    Full Text Available A clear distinction between two of the most common forms of dilated cardiomyopathy is very important due to their different prediction and therapeutic approaches. Dobutamine stress echocardiography appears to be a noninvasive selection method due to its clear differentiation potential. Major factors influence test interpretation, resulting in a wide interval of diagnostic accuracy for this test. Fraction flow reserve (FFR is a novel invasive method for estimating coronary artery stenosis responsible for myocardium ischaemia. Decisions about lesion significance in coronary blood vessels have thus far been based on angiographic estimations, but this approach is being replaced by FFR measurements, which serve as a new gold standard and involve a noninvasive test. The goal of this study was to clearly differentiate two forms of dilated cardiomyopathies through analysis of the segmented mobility of the left ventricular wall. Fifty patients were analysed: 20 with ischaemic dilated cardiomyopathy, which was confirmed not only through coronary angiography but also functionally through FFR measurement, and 30 patients with nonischaemic dilated cardiomyopathy, which was confirmed by coronary angiography. A standard dobutamine stress echocardiography protocol was implemented. A positive dobutamine stress echocardiography test was defined as the presence of emerging incidents in segment contractility or worsening of existing incidents in at least one segment. Statistically relevant diff erences in the movement dynamics of a number of differently characterised segments during the observed time intervals (ANOVA p=0.000 was noted in both groups of patients, as was variation in the index value of the summarized mobility of the left chamber wall. In patients with ischaemic cardiomyopathies, regional contractility worsened at the maximum dose of dobutamine; in contrast, this feature slightly improved in nonischaemic cardiomyopathy patients. The results indicate

  15. Controlled weather balloon ascents and descents for atmospheric research and climate monitoring

    Science.gov (United States)

    Kräuchi, Andreas; Philipona, Rolf; Romanens, Gonzague; Hurst, Dale F.; Hall, Emrys G.; Jordan, Allen F.

    2016-03-01

    In situ upper-air measurements are often made with instruments attached to weather balloons launched at the surface and lifted into the stratosphere. Present-day balloon-borne sensors allow near-continuous measurements from the Earth's surface to about 35 km (3-5 hPa), where the balloons burst and their instrument payloads descend with parachutes. It has been demonstrated that ascending weather balloons can perturb the air measured by very sensitive humidity and temperature sensors trailing behind them, particularly in the upper troposphere and lower stratosphere (UTLS). The use of controlled balloon descent for such measurements has therefore been investigated and is described here. We distinguish between the single balloon technique that uses a simple automatic valve system to release helium from the balloon at a preset ambient pressure, and the double balloon technique that uses a carrier balloon to lift the payload and a parachute balloon to control the descent of instruments after the carrier balloon is released at preset altitude. The automatic valve technique has been used for several decades for water vapor soundings with frost point hygrometers, whereas the double balloon technique has recently been re-established and deployed to measure radiation and temperature profiles through the atmosphere. Double balloon soundings also strongly reduce pendulum motion of the payload, stabilizing radiation instruments during ascent. We present the flight characteristics of these two ballooning techniques and compare the quality of temperature and humidity measurements made during ascent and descent.

  16. Mechanism of prostatic urethroplasty with balloon catheter

    International Nuclear Information System (INIS)

    Castaneda, F.; Maynar, M.; Hulbert, J.

    1988-01-01

    A series of 60 patients have undergone prostatic urethroplasty with balloon catheters at our institution. The follow-up of these patients has ranged from more than 3 years to not less than 6 months. The preliminary results have been excellent, with a success rate of 75% in patients with predominant lateral lobe hypertrophy. This success rate drops to 25% in patients with predominant middle lobe hypertrophy. In previous communications the authors have proposed that the mechanism of prostatic urethral relief of obstruction is due to stretching of the prostatic capsule, tissue compression, and possible subsequent atrophy, as suggested by findings of transrectal US, MR imaging, voiding and retrograde urethrography, and urinary flow studies. Recent clinical information that has led to further animal research has shown that in addition to the previously supposed mechanism of action, separation of the prostatic lobes occurs by splitting of the anterior and posterior commissures of the prostatic gland tissue. This separation of the prostatic lobes is therefore the goal of the procedure. As more experience is gained, the already high success rate can probably be improved

  17. Percutaneous balloon valvuloplasty in mitral stenosis

    International Nuclear Information System (INIS)

    Park, Jae Hyung; Oh, Byung Hee; Park, Kyung Ju; Kim, Seung Hyup; Lee, Young Woo; Han, Man Chung

    1989-01-01

    Percutaneous balloon valvuloplasty(PBV) was successfully performed in 8 mitral stenosis patients for recent 3 months. Five patients have aortic insufficiencies also and two patients have mitral regurgitations below grade II/IV. All patients showed sinus rhythm on EKG, and had no mitral valvular calcification on echocardiography and fluoroscopy. PBV resulted in an increase in mitral valve area from 1.22±0.22 to 2.57±0.86 cm 2 , a decrease in mean left atrial pressure from 23.4±9.6 to 7.5±3.4 mmHg and a decrease in mean mitral pressure gradient from 21.3±9.4 to 6.8±3.1 mmHg. There were no significant complications except 2 cases of newly appeared and mildly aggravated mitral regurgitation. We believe that PBV will become a treatment modality of choice replacing surgical commissurotomy or valve replacement in a group of mitral stenosis patients, because of its effectiveness and safety

  18. Determination of a cutoff value for pelvic floor distensibility using the Epi-no balloon to predict perineal integrity in vaginal delivery: ROC curve analysis. Prospective observational single cohort study

    Directory of Open Access Journals (Sweden)

    Miriam Raquel Diniz Zanetti

    Full Text Available CONTEXT AND OBJECTIVE: Several risk factors are involved in perineal lacerations during vaginal delivery. However, little is known about the influence of perineal distensibility as a protective factor. The aim here was to determine a cutoff value for pelvic floor distensibility measured using the Epi-no balloon, which could be used as a predictive factor for perineal integrity in vaginal delivery. DESIGN AND SETTING: Prospective observational single cohort study conducted in a maternity hospital. METHODS: A convenience sample of 227 consecutive at-term parturients was used. All women had a single fetus in the vertex presentation, with up to 9.0 cm of dilation. The maximum dilation of the Epi-no balloon was measured using a tape measure after it had been inflated inside the vagina up to the parturients' maximum tolerance. The receiver operating characteristic (ROC curve was used to obtain the Epi-no circumference measurement with best sensitivity and specificity. RESULTS: Among the 161 patients who were included in the study, 50.9% underwent episiotomy, 21.8% presented lacerations and 27.3% retained an intact perineum. Age > 25.9 years; number of pregnancies > 3.4; number of deliveries > 2.2 and circumference measured by Epi-no > 21.4 cm were all directly correlated with an intact perineum. Circumference measurements using the Epi-no balloon that were greater than 20.8 cm showed sensitivity and specificity of 70.5% and 66.7% (area under curve = 0.713, respectively, as a predictive factor for an intact perineum in vaginal delivery. CONCLUSION: Circumferences greater than 20.8 cm achieved using the Epi-no balloon are a predictive factor for perineal integrity in parturients.

  19. Percutaneous dilatational tracheostomy without fiber optic bronchoscopy-Evaluation of 80 intensive care units cases

    NARCIS (Netherlands)

    J.A. Calvache (Jose Andrés); R.A. Molina García (Rodrigo); A.L. Trochez (Adolfo); J. Benitez (Javier); L.A. Flga (Lucía Arroyo)

    2013-01-01

    textabstractBackground: The development of percutaneous dilatational tracheostomy techniques (PDT) has facilitated the procedure in Intensive Care Units (ICU). Objective: To describe the early intra and post-operative complications in ICU patients requiring percutaneous dilatational tracheostomy

  20. The University of Alberta High Altitude Balloon Program

    Science.gov (United States)

    Johnson, W.; Buttenschoen, A.; Farr, Q.; Hodgson, C.; Mann, I. R.; Mazzino, L.; Rae, J.; University of Alberta High Altitude Balloon Team

    2011-12-01

    The University of Alberta High Altitude Balloon (UA-HAB) program is a one and half year program sponsored by the Canadian Space Agency (CSA) that offers hands on experience for undergraduate and graduate students in the design, build, test and flight of an experimental payload on a high altitude balloon platform. Utilising low cost weather balloon platforms, and through utilisation of the CSA David Florida Laboratory for thermal-vacuum tests , in advance of the final flight of the payload on a NASA high altitude balloon platform. Collectively the program provided unique opportunities for students to experience mission phases which parallel those of a space satellite mission. The program has facilitated several weather balloon missions, which additionally provide educational opportunities for university students and staff, as well as outreach opportunities among junior and senior high school students. Weather balloon missions provide a cheap and quick alternative to suborbital missions; they can be used to test components for more expensive missions, as well as to host student based projects from different disciplines such as Earth and Atmospheric Sciences (EAS), Physics, and Engineering. In addition to extensive skills development, the program aims to promote recruitment of graduate and undergraduate students into careers in space science and engineering. Results from the UA-HAB program and the flight of the UA-HAB shielded Gieger counter payload for cosmic ray and space radiation studies will be presented. Lessons learned from developing and maintaining a weather balloon program will also be discussed. This project is undertaken in partnership with the High Altitude Student Platform, organized by Louisiana State University and the Louisiana Space Consortium (LaSpace), and sponsored by NASA, with the financial support of the Canadian Space Agency.

  1. Cerebral ischemia associated with PercuSurge balloon occlusion balloon during carotid stenting: Incidence and possible mechanisms.

    Science.gov (United States)

    Chaer, Rabih A; Trocciola, Susan; DeRubertis, Brian; Lin, Stephanie C; Kent, K Craig; Faries, Peter L

    2006-05-01

    Interruption of antegrade cerebral perfusion results in transient neurologic intolerance in some patients undergoing carotid angioplasty and stenting (CAS). This study sought to evaluate factors that contributed to the development of cerebral ischemia during PercuSurge balloon occlusion and techniques used to allow successful completion of the CAS procedure. The PercuSurge occlusion balloon was used in 43 of 165 patients treated with CAS for high-grade stenosis (mean stenosis, 90%). All 43 patients were at increased risk for endarterectomy (7 restenosis, 3 irradiation, 3 contralateral occlusion, and 30 Goldman class II-III); 20% were symptomatic. Symptoms of cerebral hypoperfusion during temporary occlusion of the internal carotid artery occurred in 10 of 43 and included dysarthria (7/10), agitation (6/10), decreased level of consciousness (5/10), and focal hemispheric deficit (3/10). An incomplete circle of Willis or contralateral carotid artery occlusion, or both, was present in 8 of 10 patients. Symptoms resulting from PercuSurge balloon occlusion were managed by balloon deflation with or without evacuation of blood from the internal carotid artery using the Export catheter. All symptoms resolved completely without deficit after deflation of the occlusion balloon. The development of neurologic symptoms after initial PercuSurge balloon inflation and occluded internal carotid artery flow was associated with a decrease in the mean Glasgow Coma Scale (GCS) from 15 to 10 (range, 9 to 14); the GCS returned to normal after occlusion balloon deflation and remained normal during subsequent reinflation. The mean time to spontaneous recovery of full neurologic function was 8 minutes (range, 4 to 15 minutes). No thrombotic or embolic events were present on cerebral angiography or computed tomography scan. Balloon reinflation was performed after a mean reperfusion interval of 10 minutes after full neurologic recovery (range, 4 to 20 minutes). The mean subsequent procedure

  2. Percutaneous Dilational Tracheotomy in Solid-Organ Transplant Recipients.

    Science.gov (United States)

    Ozdemirkan, Aycan; Ersoy, Zeynep; Zeyneloglu, Pinar; Gedik, Ender; Pirat, Arash; Haberal, Mehmet

    2015-11-01

    Solid-organ transplant recipients may require percutaneous dilational tracheotomy because of prolonged mechanical ventilation or airway issues, but data regarding its safety and effectiveness in solid-organ transplant recipients are scarce. Here, we evaluated the safety, effectiveness, and benefits in terms of lung mechanics, complications, and patient comfort of percutaneous dilational tracheotomy in solid-organ transplant recipients. Medical records from 31 solid-organ transplant recipients (median age of 41.0 years [interquartile range, 18.0-53.0 y]) who underwent percutaneous dilational tracheotomy at our hospital between January 2010 and March 2015 were analyzed, including primary diagnosis, comorbidities, duration of orotracheal intubation and mechanical ventilation, length of intensive care unit and hospital stays, the time interval between transplant to percutaneous dilational tracheotomy, Acute Physiology and Chronic Health Evaluation II score, tracheotomy-related complications, and pulmonary compliance and ratio of partial pressure of arterial oxygen to fraction of inspired oxygen. The median Acute Physiology and Chronic Health Evaluation II score on admission was 24.0 (interquartile range, 18.0-29.0). The median interval from transplant to percutaneous dilational tracheotomy was 105.5 days (interquartile range, 13.0-2165.0 d). The only major complication noted was left-sided pneumothorax in 1 patient. There were no significant differences in ratio of partial pressure of arterial oxygen to fraction of inspired oxygen before and after procedure (170.0 [interquartile range, 102.2-302.0] vs 210.0 [interquartile range, 178.5-345.5]; P = .052). However, pulmonary compliance results preprocedure and postprocedure were significantly different (0.020 L/cm H2O [interquartile range, 0.015-0.030 L/cm H2O] vs 0.030 L/cm H2O [interquartile range, 0.020-0.041 L/cm H2O); P = .001]). Need for sedation significantly decreased after tracheotomy (from 17 patients [54.8%] to

  3. Fluoroscopically guided pyeloureteral interventions using a retrograde perurethral approach

    International Nuclear Information System (INIS)

    Amendola, M.A.; Banner, M.P.; Pollack, H.M.; Gordon, R.L.; Van Arsdalen, K.N.

    1987-01-01

    Employing standard interventional equipment, fluoroscopy, and partially or completely inserted ureteral catheters for access, the authors performed 168 perurethral interventional procedures since 1985. Procedures have included insertion of double (n = 42) or single pigtail stents (n = 47), advancement of retrograde ureteral catheters with or without displacement of a ureteral stone to the renal pelvis (n = 42), urothelial biopsy (n = 30), balloon dilation of ureteral structures (n = 3), ureteral stone extraction (n = 1), and conversion of retrograde to antegrade catheters for balloon dilation of ureteropelvic junction strictures (n = 3). This retrograde approach often obviates the need for antegrade interventional procedures (including percutaneous nephrostomy and ureteral stenting), ureteroscopy, or surgery. Indications, techniques, pitfalls, and complications are illustrated

  4. The ATIC Long Duration Balloon Project

    Science.gov (United States)

    Guzik, T.

    Long Duration Balloon (LDB) scientific experiments, launched to circumnavigate the south pole over Antarctica, have particular advantages compared to Shuttle or other Low Earth Orbit (LEO) missions in terms of cost, weight, scientific "duty factor" and work force development. The Advanced Thin Ionization Calorimeter (ATIC) cosmic ray astrophysics experiment is a good example of a university-based project that takes full advantage of current LDB capability and could effectively use future expansion in launch weight and flight duration. The ATIC experiment is currently being shipped to Antarctica in preparation for its first LDB science flight that will investigate the charge composition and energy spectra of primary cosmic rays over the energy range from about 101 0 to 10 1 4 eV. The instrument is built around a fully active, Bismuth Germanate (BGO) ionization calorimeter to measure the energy deposited by the cascades formed by particles interacting in a thick carbon target. A highly segmented silicon matrix, located above the target, provides good incident charge resolution plus rejection of the "backscattered" particles from the interaction. Trajectory reconstruction is based on the cascade profile in the BGO calorimeter, plus information from the three scintillator hodoscope layers in the target section above it. The hodoscope planes also provide the primary event trigger to initiate the detector readout, another measure of the incident particle charge and an indicator of the interaction point in the carbon material. The scientific payload weighs ~1,540 kg and consumes ~300 Watts of power supplied by a ~580 Watt solar array system. A full evaluation of the experiment was performed during a test flight occurring between 28 December 2000 and 13 January 2001 where ATIC was carried3 to an altitude of ~37 km above Antarctica by a ~850,000 m helium filled balloon for one circumnavigation of the continent. All systems behaved well, the detectors performed as expected

  5. Ideal ballooning stability of JET discharges

    International Nuclear Information System (INIS)

    Galvao, R.M.O.; Lazzaro, E.; O'Rourke, J.; Smeulders, P.; Schmidt, G.

    1989-01-01

    Conditions under which ballooning modes are expected to be excited have recently been obtained in two different types of discharges in JET. In the first type, discharges with β approaching the Troyon-Sykes-Wesson critical value β c for optimised pressure profiles have been produced at low toroidal fields (B T =1.5T). In the second type, extremely high pressure gradients have been produced in the plasma core through pellet injection in the current rise phase of the discharge followed by strong additional heating. The stability of these discharges has been studied with the stability code HBT coupled to the equilibrium identification code IDENTC. The equilibrium pressure and diamagnetic function profiles are determined in IDENTC by an optimisation procedure to fit the external magnetic measurements. The resulting pressure profile in the equatorial plane is then compared with the profile derived from 'direct' measurements, i.e. electron density and temperature profiles measured by the LIDAR diagnostic system, ion-temperature profile measured by the charge-exchange diagnostic system, and ion density profile calculated from the Z eff and electron density profiles. Furthermore, the value of the safety factor q on axis is compared with that determined from polarimetry. When good agreement is found, the output data from IDENTC is passed directly to HBT to carry out the stability analysis. When there is not a good agreement, as in the case of pellet discharges with highly peaked pressure profiles, the equilibrium is reevaluated using the 'experimental' profile and the data from polarimetry. (author) 6 refs., 4 figs

  6. Advances in the Remote Monitoring of Balloon Flights

    Science.gov (United States)

    Breeding, S.

    At the National Scientific Balloon Facility (NSBF), we must staff the Long Duration Balloon (LDB) control center 24 hours a day during LDB flights. This requires three daily shifts of two operators (balloon control and tdrss scheduling). In addition to this we also have one engineer on-call as LDB Lead to resolve technical issues and one manager on-call for flight management. These on-call periods are typically 48 to 72 hours in length. In the past the on-call staff had to travel to the LDB control center in order to monitor the status of a flight in any detail. This becomes problematic as flight durations push out beyond 20 to 30 day lengths, as these staff members are not available for business travel during these periods. This paper describes recent advances which allow for the remote monitoring of scientific balloon flight ground station computer displays. This allows balloon flight managers and lead engineers to check flight status and performance from any location with a network or telephone connection. This capability frees key personnel from the NSBF base during flights. It also allows other interested parties to check on the flight status at their convenience.

  7. Time-dependent strains and stresses in a pumpkin balloon

    Science.gov (United States)

    Gerngross, T.; Xu, Y.; Pellegrino, S.

    This paper presents a study of pumpkin-shaped superpressure balloons consisting of gores made from a thin polymeric film attached to high stiffness meridional tendons This type of design is being used for the NASA ULDB balloons The gore film shows considerable time-dependent stress relaxation whereas the behaviour of the tendons is essentially time-independent Upon inflation and pressurization the instantaneous i e linear-elastic strain and stress distributions in the film show significantly higher values in the meridional direction However over time and due to the biaxial visco-elastic stress relaxation of the the gore material the em hoop strains increase and the em meridional stresses decrease whereas the em remaining strain and stress components remain substantially unchanged These results are important for a correct assessment of the structural integrity of a pumpkin balloon in a long-duration mission both in terms of the material performance and the overall stability of the shape of the balloon An experimental investigation of the time dependence of the biaxial strain distribution in the film of a 4 m diameter 48 gore pumpkin balloon is presented The inflated shape of selected gores has been measured using photogrammetry and the time variation in strain components at some particular points of these gores has been measured under constant pressure and temperature The results show good correlation with a numerical study using the ABAQUS finite-element package that includes a widely used model of

  8. Aerial Deployment and Inflation System for Mars Helium Balloons

    Science.gov (United States)

    Lachenmeler, Tim; Fairbrother, Debora; Shreves, Chris; Hall, Jeffery, L.; Kerzhanovich, Viktor V.; Pauken, Michael T.; Walsh, Gerald J.; White, Christopher V.

    2009-01-01

    A method is examined for safely deploying and inflating helium balloons for missions at Mars. The key for making it possible to deploy balloons that are light enough to be buoyant in the thin, Martian atmosphere is to mitigate the transient forces on the balloon that might tear it. A fully inflated Mars balloon has a diameter of 10 m, so it must be folded up for the trip to Mars, unfolded upon arrival, and then inflated with helium gas in the atmosphere. Safe entry into the Martian atmosphere requires the use of an aeroshell vehicle, which protects against severe heating and pressure loads associated with the hypersonic entry flight. Drag decelerates the aeroshell to supersonic speeds, then two parachutes deploy to slow the vehicle down to the needed safe speed of 25 to 35 m/s for balloon deployment. The parachute system descent dynamic pressure must be approximately 5 Pa or lower at an altitude of 4 km or more above the surface.

  9. Data of methylome and transcriptome derived from human dilated cardiomyopathy

    Directory of Open Access Journals (Sweden)

    Bong-Seok Jo

    2016-12-01

    Full Text Available Alterations in DNA methylation and gene expression have been implicated in the development of human dilated cardiomyopathy (DCM. Differentially methylated probes (DMPs and differentially expressed genes (DEGs were identified between the left ventricle (LV, a pathological locus for DCM and the right ventricle (RV, a proxy for normal hearts. The data in this DiB are for supporting our report entitled “Methylome analysis reveals alterations in DNA methylation in the regulatory regions of left ventricle development genes in human dilated cardiomyopathy” (Bong-Seok Jo, In-Uk Koh, Jae-Bum Bae, Ho-Yeong Yu, Eun-Seok Jeon, Hae-Young Lee, Jae-Joong Kim, Murim Choi, Sun Shim Choi, 2016 [1].

  10. Learning a Dilated Residual Network for SAR Image Despeckling

    Science.gov (United States)

    Zhang, Qiang; Yuan, Qiangqiang; Li, Jie; Yang, Zhen; Ma, Xiaoshuang

    2018-01-01

    In this paper, to break the limit of the traditional linear models for synthetic aperture radar (SAR) image despeckling, we propose a novel deep learning approach by learning a non-linear end-to-end mapping between the noisy and clean SAR images with a dilated residual network (SAR-DRN). SAR-DRN is based on dilated convolutions, which can both enlarge the receptive field and maintain the filter size and layer depth with a lightweight structure. In addition, skip connections and residual learning strategy are added to the despeckling model to maintain the image details and reduce the vanishing gradient problem. Compared with the traditional despeckling methods, the proposed method shows superior performance over the state-of-the-art methods on both quantitative and visual assessments, especially for strong speckle noise.

  11. Learning a Dilated Residual Network for SAR Image Despeckling

    Directory of Open Access Journals (Sweden)

    Qiang Zhang

    2018-01-01

    Full Text Available In this paper, to break the limit of the traditional linear models for synthetic aperture radar (SAR image despeckling, we propose a novel deep learning approach by learning a non-linear end-to-end mapping between the noisy and clean SAR images with a dilated residual network (SAR-DRN. SAR-DRN is based on dilated convolutions, which can both enlarge the receptive field and maintain the filter size and layer depth with a lightweight structure. In addition, skip connections and a residual learning strategy are added to the despeckling model to maintain the image details and reduce the vanishing gradient problem. Compared with the traditional despeckling methods, the proposed method shows a superior performance over the state-of-the-art methods in both quantitative and visual assessments, especially for strong speckle noise.

  12. Dilated Virchow–Robin spaces mimicking a brainstem arteriovenous malformation

    Directory of Open Access Journals (Sweden)

    Thomas J Buell

    2017-01-01

    Full Text Available Virchow–Robin spaces (VRS are ubiquitous and commonly observed as the resolution of magnetic resonance imaging (MRI continues to improve. The function of VRS and the etiology of their dilation is still a subject of research. Diagnosing dilated VRS (dVRS can be challenging because they may appear similar to other pathologies such as cystic neoplasms, infectious cysts, and even arteriovenous malformations (AVMs on certain MRI pulse sequences. We reported a unique case of brainstem dVRS mimicking an AVM. Furthermore, the extensive pontine involvement of our patient's lesion is rarely described in neurosurgical literature. Understanding the imaging characteristics of dVRS is critical to accurately diagnose these lesions and avoid unnecessary tests and procedures.

  13. Is there cosmological time dilation in gamma-ray bursts?

    Science.gov (United States)

    Band, David L.

    1994-01-01

    Norris et al. report that the temporal structure of faint gamma-ray bursts is longer than that of bright bursts, as expected for time dilation in the cosmological models of burst origin. I show that the observed trends can easily be produced by a burst luminosity function and thus may not result from cosmological effects. A cosmological signature may be present, but the tests Norris et al. present are not powerful enough to detect these signatures.

  14. Quantum Channels, Wavelets, Dilations and Representations of $O_n$

    OpenAIRE

    Kribs, David W.

    2003-01-01

    We show that the representations of the Cuntz C$^\\ast$-algebras $O_n$ which arise in wavelet analysis and dilation theory can be classified through a simple analysis of completely positive maps on finite-dimensional space. Based on this analysis, an application in quantum information theory is obtained; namely, a structure theorem for the fixed point set of a unital quantum channel. We also include some open problems motivated by this work.

  15. Corrosion Behavior of Platinum-Enhanced Radiopaque Stainless Steel (PERSS®) for Dilation-Baloon Expandable Coronary Stents

    Energy Technology Data Exchange (ETDEWEB)

    Covino, Jr., Bernard S.; Craig, Charles H.; Cramer, Stephen D.; Bullard, Sophie J.; Ziomek-Moroz, Margaret; Jablonski, Paul D.; Turner, Paul C.; Radisch, Jr., Herbert R.; Gokcen, Nev A.; Friend, Clifford M.; Edwards, Michael R.

    2002-05-01

    Dilation-balloon expandable coronary stents are commonly made of implant grade stainless steels conforming to ASTM F138/F139, e.g., Biodur? 316LS (UNS S31673). Typical of such stents is the Boston Scientific/Interventional Technologies? (BS/IVT) LP-StentTM. In 2000, BS/IVT determined that the addition of 5 to 6 wt % platinum to Biodur 316LS produced a stainless steel with enhanced radiopacity to make their stents more visible radiographically and thus more effective clinically. A goal of the program was to ensure platinum additions would not adversely affect the corrosion resistance of Biodur 316LS. The corrosion resistance of 5-6 wt % PERSS? alloys and Biodur 316LS was determined using electrochemical tests for general, pitting, crevice and intergranular corrosion. Experimental methods included ASTM A262E, F746, F2129, and potentiodynamic polarization. The 6 wt % PERSS? alloy (IVT 78) had a resistance to pitting, crevice and intergranular corrosion that was similar to the Biodur 316LS base material. IVT 78 was a single-phase austenitic alloy with no evidence of inclusions or precipitates. It was more resistant to pitting corrosion than 5 wt % PERSS? alloys. Performance of the PERSS? alloys was not a function of alloy oxygen content in the range 0.01 to 0.03 wt %.

  16. Mounier-Kuhn syndrome: a rare cause of bronchial dilation.

    Science.gov (United States)

    Celik, Burcin; Bilgin, Salih; Yuksel, Canan

    2011-01-01

    Mounier-Kuhn syndrome, or tracheobronchomegaly, is a rare clinical and radiologic condition characterized by marked tracheobronchial dilation and recurrent lower respiratory tract infections. Diagnosis is typically accomplished with the use of computed tomography and bronchoscopy, as well as pulmonary function testing. Patients may be asymptomatic; however, symptoms can range from minimal with preserved lung function to severe respiratory failure. Therapy, if any, is supportive but minimal. Surgery rarely has a place in the treatment of Mounier-Kuhn syndrome.Herein, we report the case of a 58-year-old man with chronic obstructive pulmonary disease who had a chronic cough, increased sputum production, and chest pain. Thoracic computed tomography showed tracheal dilation (diameter, 34 mm) and multiple diverticula in the posterior region of the trachea. Fiberoptic bronchoscopy revealed enlarged main bronchi, the dilated trachea, and prominent tracheal diverticula. Pulmonary function testing disclosed impaired respiratory function. Histopathologic examination of biopsy specimens from the bronchi and the tracheal wall supported the diagnosis of Mounier-Kuhn syndrome. The patient was released from the hospital and his condition was monitored for 2 years, during which time he developed no lower respiratory tract infections.Regardless of radiologic findings that suggest recurrent lower respiratory tract infection, we recommend that Mounier-Kuhn syndrome be considered in the differential diagnosis.

  17. Ethanol vapour induced dilated cardiomyopathy in chick embryos

    International Nuclear Information System (INIS)

    Kamran, K.; Khan, M.Y.; Minhas, L.A.

    2013-01-01

    Objective: To study the effects of ethanol vapour inhalation on the heart chambers of chick embryo. Methods: The case-control study was conducted at the College of Physicians and Surgeons Pakistan regional centre in Islamabad from January to October 2007. Both experimental and control groups were divided into three sub-groups each, based on the day of the sacrifice. Each group was dissected on day 7, day 10 and day 22 or hatching whichever was earlier. The experimental sub-groups sacrificed on day 7, day 10 and on hatching, were exposed to ethanol vapours till day 6, 9 and 9 of incubation respectively. The diameter of all 4 chambers was measured in experimental hearts and compared with age-matched controls. SPSS 10 was used for statistical analysis. Results: Ethanol vapour exposure caused widening of all heart chambers in the experimental chick embryos sacrificed on day 7 and day 10 compared to the controls. The chambers of newly hatched chick hearts showed dilatation in all the chambers except the left ventricle. Conclusion: Ethanol vapour exposure during development affects the heart, resulting in the widening of all heart chambers. The exposure is as dangerous as drinking alcohol. Alcohol vapour exposure during development leads to progressive dilatation in different heart chambers, producing dilated cardiomyopathy. (author)

  18. Massively dilated right atrium masquerading as a mediastinal tumor

    Directory of Open Access Journals (Sweden)

    Thomas Schroeter

    2011-04-01

    Full Text Available Severe tricuspid valve insufficiency causes right atrial dilatation, venous congestion, and reduced atrial contractility, and may eventually lead to right heart failure. We report a case of a patient with severe tricuspid valve insufficiency, right heart failure, and a massively dilated right atrium. The enormously dilated atrium compressed the right lung, resulting in a radiographic appearance of a mediastinal tumor. Tricuspid valve repair and reduction of the right atrium was performed. Follow up examination revealed improvement of liver function, reduced peripheral edema and improved New York Heart Association (NYHA class. The reduction of the atrial size and repair of the tricuspid valve resulted in a restoration of the conduit and reservoir function of the right atrium. Given the chronicity of the disease process and the long-standing atrial fibrillation, there is no impact of this operation on right atrial contraction. In combination with the reconstruction of the tricuspid valve, the reduction atrioplasty will reduce the risk of thrombembolic events and preserve the right ventricular function.

  19. High n ballooning modes in highly elongated tokamaks

    International Nuclear Information System (INIS)

    An, C.H.; Bateman, G.

    1980-02-01

    An analytic study of stability against high n ballooning modes in highly elongated axisymmetric plasmas is presented and compared with computational results. From the equation for the marginal pressure gradient, it is found that the local shear plays an important role on the stability of elongated and shifted plasma, and that high elongation deteriorates the stability by decreasing the stabilizing effects of field line bending and local shear. The net contribution of the local shear to stability decreases with elongation and shift for strongly ballooning modes (eigenfunctions strongly localized near the outer edge of the toroidal flux surfaces) but increases for interchange modes (eigenfunctions more uniform along the flux surfaces). The computational study of high n ballooning modes in a highly elongated plasma reveals that lowering the aspect ratio and broadening the pressure profile enhance the marginal beta for β/sub p/ less than unity but severely reduce the marginal beta for β/sub p/ larger than unity

  20. Review of the British scientific sounding rocket and balloon programmes

    International Nuclear Information System (INIS)

    Delury, J.T.

    1978-01-01

    This review describes the UK scientific sounding rocket programmes which have utilised Skylarks for 21 years, Petrels for 10 years and Fulmars for 2 years. The SRC's ongoing programme is now based on the Petrel and Fulmar rockets, and approved proposals by 5 UK scientific groups covering 1978 and 1979 are outlined. The British scientific balloon programme, which serves 14 scientific groups within UK universities, involves a planned 10 flights per annum using balloons of 3 M cu ft to 31 M cu ft capacity and payloads up to 2 tons in weight. The review outlines the balloon programme of flights planned mainly from Palestine in Texas and Alice Springs/Mildura in Australia. (author)

  1. Popping balloons: formation of a crack network in rubber membranes

    Science.gov (United States)

    Moulinet, Sebastien; Adda-Bedia, Mokhtar; Equipe Morphogenèse et phénomènes multi-échelle Team

    2015-03-01

    Everyone can make the observation: a rubber balloon inflated until it spontaneously pop breaks into a large number of shreds. In contrast, a balloon pierced with a needle at an early stage of its inflation breaks into two large pieces. Using model latex balloons, we have experimentally investigated the transition between these two breaking regimes. We have showed that, above a threshold stress in the latex membrane, a single crack become unstable and separates into two new cracks. Then, a cascade of tip-splitting generates a network of cracks that eventually form a large number of fragments. We have observed that the instability of the crack occurs when it reaches a limit velocity that could the speed of sound. By studying the energy balance during the explosion, we can determine the intrinsic fracture energy of rubber, a measurement difficult to achieve with usual tensile testing.

  2. JUBA (Joint UAS-Balloon Activities) Final Campaign Report.

    Energy Technology Data Exchange (ETDEWEB)

    Dexheimer, Darielle [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Apple, Monty [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Callow, Diane Schafer [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Longbottom, Casey Michael [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Novick, David K. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Wilson, Christopher W. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2018-02-01

    Using internal investment funds within Sandia National Laboratories’ (SNL) Division 6000, JUBA was a collaborative exercise between SNL Orgs. 6533 & 6913 (later 8863) to demonstrate simultaneous flights of tethered balloons and UAS on the North Slope of Alaska. JUBA UAS and tethered balloon flights were conducted within the Restricted Airspace associated with the ARM AMF3 site at Oliktok Point, Alaska. The Restricted Airspace occupies a 2 nautical mile radius around Oliktok Point. JUBA was conducted at the Sandia Arctic Site, which is approximately 2 km east-southeast of the AMF3. JUBA activities occurred from 08/08/17 – 08/10/17. Atmospheric measurements from tethered balloons can occur for a long duration, but offer limited spatial variation. Measurements from UAS could offer increased spatial variability.

  3. Absence of Bacteria on Coronary Angioplasty Balloons from Unselected Patients

    DEFF Research Database (Denmark)

    Hansen, Gorm Mørk; Nilsson, Martin; Nielsen, Claus Henrik

    2015-01-01

    , and translocation of bacteria from the oral cavity to the coronary arteries may play a role in the development of coronary artery disease. Very few studies have used angioplasty balloons for in vivo sampling from diseased coronary arteries, and with varying results. Therefore, the aim of this study was to assess...... if bacterial DNA from primarily oral bacteria could be detected on coronary angioplasty balloons by use of an optimized sampling process combined with an internally validated sensitive polymerase chain reaction (PCR) assay. Coronary angioplasty balloons and control samples from a total of 45 unselected...... patients with stable angina, unstable angina/non-ST elevation myocardial infarction, and ST-elevation myocardial infarction (n = 15 in each group) were collected and analyzed using a PCR assay with high sensitivity and specificity for 16S rRNA genes of the oral microbiome. Despite elimination of extraction...

  4. Ileal Varices Treated with Balloon-Occluded Retrograde Transvenous Obliteration.

    Science.gov (United States)

    Sato, Takahiro; Yamazaki, Katsu; Toyota, Jouji; Karino, Yoshiyasu; Ohmura, Takumi; Akaike, Jun

    2009-04-01

    A 55-year-old man with hepatitis B virus antigen-positive liver cirrhosis was admitted to our hospital with anal bleeding. Colonoscopy revealed blood retention in the entire colon, but no bleeding lesion was found. Computed tomography images showed that vessels in the ileum were connected to the right testicular vein, and we suspected ileal varices to be the most probable cause of bleeding. We immediately performed double balloon enteroscopy, but failed to find any site of bleeding owing to the difficulty of fiberscope insertion with sever adhesion. Using a balloon catheter during retrograde transvenous venography, we found ileal varices communicating with the right testicular vein (efferent vein) with the superior mesenteric vein branch as the afferent vein of these varices. We performed balloon occluded retrograde transvenous obliteration by way of the efferent vein of the varices and have detected no further bleeding in this patient one year after treatment.

  5. Iridium: Global OTH data communications for high altitude scientific ballooning

    Science.gov (United States)

    Denney, A.

    While the scientific community is no stranger to embracing commercially available technologies, the growth and availability of truly affordable cutting edge technologies is opening the door to an entirely new means of global communications. For many years high altitude ballooning has provided science an alternative to costly satellite based experimental platforms. As with any project, evolution becomes an integral part of development. Specifically in the NSBF ballooning program, where flight durations have evolved from the earlier days of hours to several weeks and plans are underway to provide missions up to 100 days. Addressing increased flight durations, the harsh operational environment, along with cumbersome and outdated systems used on existing systems, such as the balloon vehicles Support Instrumentation Package (SIP) and ground-based systems, a new Over-The-Horizon (OTH) communications medium is sought. Current OTH equipment planning to be phased-out include: HF commanding systems, ARGOS PTT telemetry downlinks and INMARSAT data terminals. Other aspects up for review in addition to the SIP to utilize this communications medium include pathfinder balloon platforms - thereby, adding commanding abilities and increased data rates, plus providing a package for ultra-small experiments to ride aloft. Existing communication systems employed by the National Scientific Balloon Facility ballooning program have been limited not only by increased cost, slow data rates and "special government use only" services such as TDRSS (Tracking and Data Relay Satellite System), but have had to make special provisions to geographical flight location. Development of the Support Instrumentation Packages whether LDB (Long Duration Balloon), ULDB (Ultra Long Duration Balloon) or conventional ballooning have been plagued by non-standard systems configurations requiring additional support equipment for different regions and missions along with a myriad of backup for redundancy. Several

  6. Dilated odontoma: A report of two cases from a radiological perspective

    Science.gov (United States)

    Jayachandran, S.; Kayal, L.; Sharma, Aatman; Priyanka, Khobre

    2016-01-01

    Dilated odontoma is the most extreme form of dens invaginatus. The lesion appears as a roughly spherical mass that does not resemble a tooth but in a way appears tooth - like on radiographs due to somewhat similar radiodensity. The lesion is mostly spherical in appearance and hence the term “dilated.” Occasionally, we come across cases of simultaneous pathologies. Here, we report two cases of a dilated odontoma one of which is associated with dentigerous cyst and in other case dilated odontoma pushing the maxillary sinus superiorly. Histologically, the mass was composed of dentinal tubules. These morphological and histological features are compatible with those of a dilated odontoma. PMID:27041914

  7. Dilated odontoma: A report of two cases from a radiological perspective

    Directory of Open Access Journals (Sweden)

    S Jayachandran

    2016-01-01

    Full Text Available Dilated odontoma is the most extreme form of dens invaginatus. The lesion appears as a roughly spherical mass that does not resemble a tooth but in a way appears tooth - like on radiographs due to somewhat similar radiodensity. The lesion is mostly spherical in appearance and hence the term “dilated.” Occasionally, we come across cases of simultaneous pathologies. Here, we report two cases of a dilated odontoma one of which is associated with dentigerous cyst and in other case dilated odontoma pushing the maxillary sinus superiorly. Histologically, the mass was composed of dentinal tubules. These morphological and histological features are compatible with those of a dilated odontoma.

  8. Particle Astrophysics in NASA's Long Duration Balloon Program

    Energy Technology Data Exchange (ETDEWEB)

    Gorham, Peter W.

    2013-10-15

    A century after Viktor Hess' discovery of cosmic rays, balloon flights still play a central role in the investigation of cosmic rays over nearly their entire spectrum. We report on the current status of NASA balloon program for particle astrophysics, with particular emphasis on the very successful Antarctic long-duration balloon program, and new developments in the progress toward ultra-long duration balloons.

  9. Properties of nylon 12 balloons after thermal and liquid carbon dioxide treatments.

    Science.gov (United States)

    Ro, Andrew J; Davé, Vipul

    2013-03-01

    Critical design attributes of angioplasty balloons include the following: tear resistance, high burst pressures, controlled compliance, and high fatigue. Balloons must have tear resistance and high burst pressures because a calcified stenosis can be hard and nominal pressures of up to 16 atm can be used to expand the balloon. The inflated balloon diameter must be a function of the inflation pressure, thus compliance is predictable and controlled. Reliable compliance is necessary to prevent damage to vessel walls, which may be caused by over-inflation. Balloons are often inflated multiple times in a clinical setting and they must be highly resistant to fatigue. These design attributes are dependent on the mechanical properties and polymer morphology of the balloon. The effects of residual stresses on shrinkage, crystallite orientation, balloon compliance, and mechanical properties were studied for angioplasty nylon 12 balloons. Residual stresses of these balloons were relieved by oven heat treatment and liquid CO2 exposure. Residual stresses were measured by quantifying shrinkage at 80 °C of excised balloon samples using a dynamic mechanical analyzer. Shrinkage was lower after oven heat treatment and liquid CO2 exposure compared to the as-received balloons, in the axial and radial directions. As-received, oven heat treated, and liquid CO2-exposed balloon samples exhibited similar thermal properties (T(g), T(m), X(t)). Crystallite orientation was not observed in the balloon cylindrical body using X-ray scattering and polarized light microscopy, which may be due to balloon fabrication conditions. Significant differences were not observed between the stress-strain curves, balloon compliance, and average burst pressures of the as-received, oven heat treated, and liquid CO2-exposed balloons. Copyright © 2012 Elsevier B.V. All rights reserved.

  10. AIAA Educator Academy: The Space Weather Balloon Module

    Science.gov (United States)

    Longmier, B.; Henriquez, E.; Bering, E. A.; Slagle, E.

    2013-12-01

    Educator Academy is a K-12 STEM curriculum developed by the STEM K-12 Outreach Committee of the American Institute of Aeronautics and Astronautics (AIAA). Consisting of three independent curriculum modules, K-12 students participate in inquiry-based science and engineering challenges to improve critical thinking skills and enhance problem solving skills. The Space Weather Balloon Curriculum Module is designed for students in grades 9-12. Throughout this module, students learn and refine physics concepts as well as experimental research skills. Students participate in project-based learning that is experimental in nature. Students are engaged with the world around them as they collaborate to launch a high altitude balloon equipped with HD cameras.The program leaders launch high altitude weather balloons in collaboration with schools and students to teach physics concepts, experimental research skills, and to make space exploration accessible to students. A weather balloon lifts a specially designed payload package that is composed of HD cameras, GPS tracking devices, and other science equipment. The payload is constructed and attached to the balloon by the students with low-cost materials. The balloon and payload are launched with FAA clearance from a site chosen based on wind patterns and predicted landing locations. The balloon ascends over 2 hours to a maximum altitude of 100,000 feet where it bursts and allows the payload to slowly descend using a built-in parachute. The payload is located using the GPS device. In April 2012, the Space Weather Balloon team conducted a prototype field campaign near Fairbanks Alaska, sending several student-built experiments to an altitude of 30km, underneath several strong auroral displays. To better assist teachers in implementing one or more of these Curriculum Modules, teacher workshops are held to give teachers a hands-on look at how this curriculum is used in the classroom. And, to provide further support, teachers are each

  11. Cloud Water Content Sensor for Sounding Balloons and Small UAVs

    Science.gov (United States)

    Bognar, John A.

    2009-01-01

    A lightweight, battery-powered sensor was developed for measuring cloud water content, which is the amount of liquid or solid water present in a cloud, generally expressed as grams of water per cubic meter. This sensor has near-zero power consumption and can be flown on standard sounding balloons and small, unmanned aerial vehicles (UAVs). The amount of solid or liquid water is important to the study of atmospheric processes and behavior. Previous sensing techniques relied on strongly heating the incoming air, which requires a major energy input that cannot be achieved on sounding balloons or small UAVs.

  12. Cosmic ray abundance measurements with the CAKE balloon experiment

    CERN Document Server

    Cecchini, S.; Giacomelli, G.; Manzoor, S.; Medinaceli, E.; Patrizii, L.; Togo, V.

    2005-01-01

    We present the results from the CAKE (Cosmic Abundance below Knee Energy) balloon experiment which uses nuclear track detectors. The final experiment goal is the determination of the charge spectrum of CR nuclei with Z $>$ 30 in the primary cosmic radiation. The detector, which has a geometric acceptance of $\\sim$ 1.7 m$^2$sr, was exposed in a trans-mediterranean stratospheric balloon flight. Calibrations of the detectors used (CR39 and Lexan), scanning strategies and algorithms for tracking particles in an automatic mode are presented. The present status of the results is discussed

  13. Polymer blends for LDB applications. [Long Duration Ballooning

    Science.gov (United States)

    Lichkus, Andrew M.; Harrison, Ian R.

    1991-01-01

    A series of LCP/PE blends have been studied to determine the potential of such systems to produce a high modulus balloon film material which retains the balloon fabrication and low temperature flight advantages of the current PE films. Blown films of blends of 5 and 15 percent LCP in PE have been produced which show a 28 percent enhancement in modulus over the neat PE matrix. These results are substantially lower than anticipated and are explained in terms of the LCP reinforcement aspect ratio and fibril diameter.

  14. Emerging Stent and Balloon Technologies in the Femoropopliteal Arteries

    Directory of Open Access Journals (Sweden)

    Georgios Pastromas

    2014-01-01

    Full Text Available Endovascular procedures for the management of the superficial femoral (SFA and popliteal artery disease are increasingly common. Over the past decade, several stent technologies have been established which may offer new options for improved clinical outcomes. This paper reviews the current evidence for SFA and popliteal artery angioplasty and stenting, with a focus on randomized trials and registries of nitinol self-expanding stents, drug-eluting stents, dug-coated balloons, and covered stent-grafts. We also highlight the limitations of the currently available data and the future routes in peripheral arterial disease (PAD stent and balloon technology.

  15. The German scientific balloon and sounding rocket programme

    International Nuclear Information System (INIS)

    Dahl, A.F.

    1980-01-01

    This report contains information on sounding rocket projects in the scientific field of astronomy, aeronomy, magnetosphere, and material science under microgravity. The scientific balloon projects are performed with emphasis on astronomical research. By means of tables it is attempted to give a survey, as complete as possible, of the projects the time since the last symposium in Ajaccio, Corsica, and of preparations and plans for the future until 1983. The scientific balloon and sounding rocket projects form a small successful part of the German space research programme. (Auth.)

  16. Proposal for a revised definition of dilated cardiomyopathy, hypokinetic non-dilated cardiomyopathy, and its implications for clinical practice

    DEFF Research Database (Denmark)

    Pinto, Yigal M; Elliott, Perry M; Arbustini, Eloisa

    2016-01-01

    In this paper the Working Group on Myocardial and Pericardial Disease proposes a revised definition of dilated cardiomyopathy (DCM) in an attempt to bridge the gap between our recent understanding of the disease spectrum and its clinical presentation in relatives, which is key for early diagnosis...... and the institution of potential preventative measures. We also provide practical hints to identify subsets of the DCM syndrome where aetiology directed management has great clinical relevance....

  17. BioEnterics Intragastric Balloon (BIB) versus Spatz Adjustable Balloon System (ABS): Our experience in the elderly.

    Science.gov (United States)

    Russo, Teresa; Aprea, Giovanni; Formisano, Cesare; Ruggiero, Simona; Quarto, Gennaro; Serra, Raffaele; Massa, Guido; Sivero, Luigi

    2017-02-01

    The BioEnterics Intragastric Balloon (BIB) and the Spatz Adjustable Balloon System (ABS) are in fact recommended for weight reduction as a bridge to bariatric surgery. We retrospected studied patients with body mass index (BMI) and age ranges of 37-46 and 70-80 years, respectively, who had undergone BIB from January 2010 to July 2012 and prospected studied patients who had undergone Spatz balloon from July 2012 to August 2014. The aim of this study is to compare BIB and Spatz in terms of weight loss, complications, and maintenance of weight after removal. For both procedures, the median weight loss was 20 ± 3 kg, median BMI at the end of the therapy was 32 ± 2, and no severe complication occurred. Copyright © 2016 IJS Publishing Group Ltd. Published by Elsevier Ltd. All rights reserved.

  18. Attitudes on and usage of balloon catheter technology in rhinology: A survey of the American Rhinologic Society.

    Science.gov (United States)

    Halderman, Ashleigh A; Stokken, Janalee; Momin, Suhael R; Smith, Timothy L; Sindwani, Raj

    2015-01-01

    Use of balloon catheter dilation in the management of paranasal sinus diseases, including chronic rhinosinusitis (CRS) and recurrent acute rhinosinusitis, remains controversial. In an effort to gain some clarity about its evolving role, we surveyed members of the American Rhinologic Society (ARS). Online survey. ARS Members were sent an invitation by e-mail to participate in an online, anonymous 23-item survey. A total of 231 participants completed the survey, for an overall response rate of 25%. Balloon catheter technology (BCT) played no role in the practices of one-third of all the respondents. Of those who did use BCT, more than 50% performed only 1-4 cases per month on average. This did not differ significantly with practice type (p = 0.2988). The overall use of BCT differed between types of practices with those in private practice reporting greater use of the technology for maxillary and sphenoid sinuses (p = 0.0003 and p = 0.0073, respectively). Participants in private practice appeared significantly more impressed with the results of BCT when compared with those in academia (p = 0.0005) and also thought that patients were more satisfied (p = 0.0002). Opinions toward the strength of available evidence also differed significantly between the two groups (p = 0.0007). Thirty-two respondents had experienced a complication with BCT, although the majority of these did not require any intervention. ARS members surveyed used BCT infrequently in their practices. Attitudes on the role of this technology in CRS management differed between academic and private practitioners, but, despite this, the volume of reported BCT use was the same. Surgeons are more accepting of the technology now compared with 5 years ago, and many of them believe that their use of BCT will increase in the future.

  19. Meshed-Pumpkin Super-Pressure Balloon Design

    Science.gov (United States)

    Jones, Jack; Yavrouian, Andre

    2003-01-01

    An improved, lightweight design has been proposed for super-pressure balloons used to carry scientific instruments at high altitudes in the atmosphere of Earth for times as long as 100 days. [A super-pressure balloon is one in which the pressure of the buoyant gas (typically, helium) is kept somewhat above ambient pressure in order to maintain approximately constant density and thereby regulate the altitude.] The proposed design, called "meshed pumpkin," incorporates the basic concept of the pumpkin design, which is so named because of its appearance. The pumpkin design entails less weight than does a spherical design, and the meshed-pumpkin design would reduce weight further. The basic idea of the meshed-pumpkin design is to reinforce the membrane of a pumpkin balloon by attaching a strong, lightweight fabric mesh to its outer surface. The reinforcement would make it possible to reduce the membrane mass to one-third or less of that of the basic pumpkin design while retaining sufficient strength to enable the balloon to remain at approximately constant altitude for months.

  20. Balloon atrial septostomy under echocardiographic guide: case series

    Directory of Open Access Journals (Sweden)

    SM Meraji

    2012-12-01

    Full Text Available Background: Balloon atrial septostomy is an emergent procedure in pediatric cardiology. Nowadays, most patients in need of the procedure have acceptable outcomes after surgical repair. Thus, it is important to perform this procedure as safe as possible. By performing early arterial switch operation and prostaglandin infusion, the rate of balloon atrial septostomy has markedly decreased. However, not all centers performing early arterial switch repairs have abandoned atrial septostomy, even in patients who respond favorably to prostaglandin infusion.Case presentation: In total, eight 1- to 15-day old term neonates admitted in Shahid Rajaee Heart Center in Tehran, Iran from October 2009 to February 2011, with congenital heart diseases were scheduled for balloon atrial septostomy. In six cases the procedure was done exclusively under echocardiographic guidance and in two cases with the help of fluoroscopy. Success was defined as the creation of an atrial septal defect with a diameter equal to or more than 5 mm and ample mobility of its margins.Results: Male sex was predominant (87% and the mean age of the neonates was six days. The diagnosis in all cases was simple transposition of great arteries. The procedure was successful in all patients with any cardiovascular complication.Conclusion: Balloon atrial septostomy is an emergent procedure that can be done safely and effectively under echocardiographic guidance. According to the feasibility of this technique it could be performed fast, safe and effective at bedside, avoiding patient transportation to hemodynamic laboratory or referral center.

  1. Balloon valvuloplasty for severe mitral valve stenosis in pregnancy ...

    African Journals Online (AJOL)

    Balloon valvuloplasties for severe mitral stenosis were performed on 11 pregnant patients with excellent resutts and no complications. The mitral valve area was increased from a mean of 0.9 cnr to 2.1 cnr. There was no clinically significant mitral regurgitation. The pregnancies proceeded normally to delivery at or near tenn, ...

  2. Balloon test project: Cosmic Ray Antimatter Calorimeter (CRAC)

    Science.gov (United States)

    Christy, J. C.; Dhenain, G.; Goret, P.; Jorand, J.; Masse, P.; Mestreau, P.; Petrou, N.; Robin, A.

    1984-01-01

    Cosmic ray observations from balloon flights are discussed. The cosmic ray antimatter calorimeter (CRAC) experiment attempts to measure the flux of antimatter in the 200-600 Mev/m energy range and the isotopes of light elements between 600 and 1,000 Mev/m.

  3. Achilles tests finally nail PWR fuel clad ballooning fears

    International Nuclear Information System (INIS)

    Dore, P.; McMinn, K.

    1992-01-01

    A conclusive series of experiments carried out by AEA Reactor Services at its Achilles rig in the UK has finally allayed fears that fuel clad ballooning is a major safety problem for Sizewell B, Britain's first Pressurized Water Reactor. The experiments are described in this article. (author)

  4. Latex Micro-balloon Pumping in Centrifugal Microfluidic Platforms

    Science.gov (United States)

    Aeinehvand, Mohammad Mahdi; Ibrahim, Fatimah; Al-Faqheri, Wisam; Thio, Tzer Hwai Gilbert; Kazemzadeh, Amin; Wadi harun, Sulaiman; Madou, Marc

    2014-01-01

    Centrifugal microfluidic platforms have emerged as point-of-care diagnostic tools. However, the unidirectional nature of the centrifugal force limits the available space for multi-stepped processes on a single microfluidics disc. To overcome this limitation, a passive pneumatic pumping method actuated at high rotational speeds has been previously proposed to pump liquid against the centrifugal force. In this paper, a novel micro-balloon pumping method that relies on elastic energy stored in a latex membrane is introduced. It operates at low rotational speeds and pumps a larger volume of liquid towards the centre of the disc. Two different micro-balloon pumping designs have been developed to study the pump performance and capacity at a range of rotational frequencies from 0 to 1500 rpm. The behaviour of the micro-balloon pump on the centrifugal microfluidic platforms has been theoretically analysed and compared with the experimental data. The experimental data shows that, the developed pumping method dramatically decreases the required rotational speed to pump liquid compared to the previously developed pneumatic pumping methods. It also shows that within a range of rotational speed, desirable volume of liquid can be stored and pumped by adjusting the size of the micro-balloon. PMID:24441792

  5. The bicuspid aortic valve and its relation to aortic dilation

    Directory of Open Access Journals (Sweden)

    Shi-Min Yuan

    2010-01-01

    Full Text Available BACKGROUND: A bicuspid aortic valve (BAV is a common congenital heart disease, which affects 1-2% of the population. However, the relationship between BAVs and aortic dilation has not been sufficiently elucidated. METHODS: A total of 241 BAV patients who were referred to this hospital for cardiac surgey over a 4.75-year period were included in this study. In addition to the clinical characteristics of the included patients, the morphological features of the aortic valve and aorta, the length of the left main coronary artery, and the laboratory findings (the coagulation and hematological parameters as well as the total cholesterol concentration were determined and compared with those of the tricuspid aortic valve (TAV patients. RESULTS: The BAV patients were younger than the TAV patients for a valve surgery in the last 3 months of the study period. The BAV patients were predominantly male. Most of the BAVs that were surgically treated were stenotic, regurgitant, or combined, and only 19 (7.88% were normally functioning valves. According to echocardiography or operative records, 148 (78.31% were type A, 31 (16.40% were type B, and 10 (5.29% were type C. The left main coronary artery was much shorter in the BAV patients than it was in the TAV patients. There was no significant difference between BAV and TAV patients in the total cholesterol concentrations; whereas differences were noted between patients receiving lipid-lowering therapy and those not receiving lipid-lowering therapy. The dimensions of the aortic root, sinotubular junction, and ascending aorta were beyond normal limits, while they were significantly smaller in the BAV patients than in the TAV patients. They were also much smaller in patients receiving statin therapy than those not receiving statin therapy in both groups. Moreover, the aortic dilation in the BAV group was found to be significantly associated with patient age. CONCLUSIONS: The BAV patients developed aortic wall and

  6. Lightweight Liquid Helium Dewar for High-Altitude Balloon Payloads

    Science.gov (United States)

    Kogut, Alan; James, Bryan; Fixsen, Dale

    2013-01-01

    Astrophysical observations at millimeter wavelengths require large (2-to-5- meter diameter) telescopes carried to altitudes above 35 km by scientific research balloons. The scientific performance is greatly enhanced if the telescope is cooled to temperatures below 10 K with no emissive windows between the telescope and the sky. Standard liquid helium bucket dewars can contain a suitable telescope for telescope diameter less than two meters. However, the mass of a dewar large enough to hold a 3-to-5-meter diameter telescope would exceed the balloon lift capacity. The solution is to separate the functions of cryogen storage and in-flight thermal isolation, utilizing the unique physical conditions at balloon altitudes. Conventional dewars are launched cold: the vacuum walls necessary for thermal isolation must also withstand the pressure gradient at sea level and are correspondingly thick and heavy. The pressure at 40 km is less than 0.3% of sea level: a dewar designed for use only at 40 km can use ultra thin walls to achieve significant reductions in mass. This innovation concerns new construction and operational techniques to produce a lightweight liquid helium bucket dewar. The dewar is intended for use on high-altitude balloon payloads. The mass is low enough to allow a large (3-to-5-meter) diameter dewar to fly at altitudes above 35 km on conventional scientific research balloons without exceeding the lift capability of the balloon. The lightweight dewar has thin (250- micron) stainless steel walls. The walls are too thin to support the pressure gradient at sea level: the dewar launches warm with the vacuum space vented continuously during ascent to eliminate any pressure gradient across the walls. A commercial 500-liter storage dewar maintains a reservoir of liquid helium within a minimal (hence low mass) volume. Once a 40-km altitude is reached, the valve venting the vacuum space of the bucket dewar is closed to seal the vacuum space. A vacuum pump then

  7. Magnetic resonance imaging of dilated cardiomyopathy; MRT bei dilatativen Kardiomyopathien

    Energy Technology Data Exchange (ETDEWEB)

    D' Anastasi, M. [Klinikum der Ludwig-Maximilians-Universitaet Muenchen, Campus Grosshadern, Institut fuer Klinische Radiologie, Muenchen (Germany); Greif, M. [Klinikum der Ludwig-Maximilians-Universitaet Muenchen, Campus Grosshadern, Medizinische Klinik und Poliklinik I, Muenchen (Germany); Reiser, M.F.; Theisen, D. [Klinikum der Ludwig-Maximilians-Universitaet Muenchen, Campus Grosshadern, Institut fuer Klinische Radiologie, Muenchen (Germany); Deutsches Zentrum fuer Herzkreislaufforschung (DZHK), Muenchen (Germany)

    2013-01-15

    Dilated cardiomyopathy (DCM) is the most common type of cardiomyopathy with a prevalence of 1 out of 2,500 in adults. Due to mild clinical symptoms in the early phase of the disease, the true prevalence is probably even much higher. Patients present with variable clinical symptoms ranging from mild systolic impairment of left ventricular function to congestive heart failure. Even sudden cardiac death may be the first clinical symptom of DCM. The severity of the disease is defined by the degree of impairment of global left ventricular function. Arrhythmias, such as ventricular or supraventricular tachycardia, atrioventricular (AV) block, ventricular extrasystole and atrial fibrillation are common cardiac manifestations of DCM. Magnetic resonance imaging (MRI) plays an important role in the exact quantification of functional impairment of both ventricles and in the evaluation of regional wall motion abnormalities. With its excellent ability for the assessment of myocardial structure, it is becoming increasingly more important for risk stratification and therapy guidance. (orig.) [German] Die dilatative Kardiomyopathie (DCM) ist die haeufigste Form der Kardiomyopathie mit einer Praevalenz von 1/2500 Erwachsenen. Aufgrund der zunaechst milden klinischen Symptomatik ist jedoch von einer relativ hohen Dunkelziffer auszugehen. Die klinische Praesentation ist variabel, die Schwere der Erkrankung wird vom Ausmass der systolischen Funktionseinschraenkung bestimmt. Herzrhythmusstoerungen, wie ventrikulaere oder supraventrikulaere Tachykardien, AV-Blockierungen, ventrikulaere Extrasystolen und Vorhofflimmern sind moegliche klinische Manifestationen. Bei manchen Patienten ist der ploetzliche Herztod die erste klinische Manifestation der Erkrankung. Die kardiale MRT spielt eine bedeutende Rolle fuer die Beurteilung des Ausmasses der ventrikulaeren Dilatation, Dysfunktion und fuer die Beurteilung regionaler Wandbewegungsstoerungen. Darueber hinaus kann sie zur Anwendung kommen

  8. Time Dilation and Homogeneous, Soft-Spectrum GRBs

    Science.gov (United States)

    Norris, J. P.; Bonnell, J. T.; Nemiroff, R. J.; Scargle, J. D.; Pendleton, G. N.; Kouveliotou, C.; Pizzichini, G.

    1996-12-01

    Recently, BATSE gamma-ray bursts selected for soft average spectra have been shown to follow more nearly a -3/2 power law in their number-intensity relation, indicative of a spatially homogeneous population, unlike the whole BATSE burst sample which deviates significantly from a -3/2 signature. The softer bursts might therefore be closer, and the reported time dilation as a function of peak flux in the whole burst sample (Bonnell et al., ApJ submitted) might be expected to be different for soft bursts. We have investigated this possibility with a sample of 500 long bursts (T_90 > 2 s) from the BATSE 3B catalog, defining soft bursts ( ~ 20% of total) using the three hardness ratios derived from fluences in BATSE's four energy channels (25--55, 55--110, 110--320, > 320 keV). The relative time-dilation factors (TDFs) were calculated using a brightness-independent algorithm for duration. The expected effect is observed: The average log[duration] of soft bursts is significantly lower (factor of ~ 2) than that for harder bursts, or for the whole set, to much dimmer peak fluxes -- consistent with unity TDF (compared to bright bursts in the whole sample) down to peak flux of ~ 1.0 photon cm(-2) s(-1) . Using a Kolmogorov-Smirnov test, we find that T_90 and T_50 duration distributions of soft and hard bursts above this peak flux value are different, with a confidence level > 99%. This result is qualitatively consistent with a GRB luminosity function implied by the apparent homogeneity of the bright-to-intermediate peak-flux soft bursts. However, dimmer soft bursts are time-dilated relative to bright bursts in the whole sample, suggesting that spectral redshift compounds the definition of the soft burst class.

  9. Biliary sphincterotomy dilation for the extraction of difficult common bile duct stones Dilatación de la esfinterotomía biliar para la extracción de coledocolitiasis difíciles

    Directory of Open Access Journals (Sweden)

    J. García-Cano

    2009-08-01

    Full Text Available Background and aim: endoscopic retrograde cholangiopancreatography (ERCP with biliary sphincterotomy (BS is the usual method for extracting common bile duct stones. However, following BS and by means of extraction balloons and Dormia baskets a complete bile duct clearance cannot be achieved in all cases. We present a study on the impact that hydrostatic balloon dilation of a previous BS (BSD may have in the extraction rate of choledocholithiasis. Patients and methods: a prospective study which included 91 consecutive patients diagnosed with choledocholithiasis who underwent ERCP. For stone removal, extraction balloons and Dormia baskets were used, and when necessary BSD was employed. Results: complete bile duct clearance was achieved in 86/91 (94.5% patients. BSD was used in 30 (33% cases. In these cases, extraction was complete in 29/30 (97%; 23 (76% patients in the BSD group had anatomic difficulties or bleeding disorders. The most frequently used hydrostatic balloon diameter was 15 mm (60%. There were 7 (7.6% complications: two self-limited hemorrhage episodes in the BSD group and one episode of cholangitis, one of pancreatitis, and three of bleeding in the group in which BSD was not used. Conclusions: BSD is a very valuable tool for extracting common bile duct stones. In our experience, there has been an increase in the extraction rate from 73% (Rev Esp Enferm Dig 2002; 94: 340-50 to 94.5% (p = 0.0001, OR 0.1, CI 0.05-0.45, with no increase in complications.

  10. Genotype-specific pathogenic effects in human dilated cardiomyopathy.

    Science.gov (United States)

    Bollen, Ilse A E; Schuldt, Maike; Harakalova, Magdalena; Vink, Aryan; Asselbergs, Folkert W; Pinto, Jose R; Krüger, Martina; Kuster, Diederik W D; van der Velden, Jolanda

    2017-07-15

    Mutations in genes encoding cardiac troponin I (TNNI3) and cardiac troponin T (TNNT2) caused altered troponin protein stoichiometry in patients with dilated cardiomyopathy. TNNI3 p.98trunc resulted in haploinsufficiency, increased Ca 2+ -sensitivity and reduced length-dependent activation. TNNT2 p.K217del caused increased passive tension. A mutation in the gene encoding Lamin A/C (LMNA p.R331Q ) led to reduced maximal force development through secondary disease remodelling in patients suffering from dilated cardiomyopathy. Our study shows that different gene mutations induce dilated cardiomyopathy via diverse cellular pathways. Dilated cardiomyopathy (DCM) can be caused by mutations in sarcomeric and non-sarcomeric genes. In this study we defined the pathogenic effects of three DCM-causing mutations: the sarcomeric mutations in genes encoding cardiac troponin I (TNNI3 p.98truncation ) and cardiac troponin T (TNNT2 p.K217deletion ; also known as the p.K210del) and the non-sarcomeric gene mutation encoding lamin A/C (LMNA p.R331Q ). We assessed sarcomeric protein expression and phosphorylation and contractile behaviour in single membrane-permeabilized cardiomyocytes in human left ventricular heart tissue. Exchange with recombinant troponin complex was used to establish the direct pathogenic effects of the mutations in TNNI3 and TNNT2. The TNNI3 p.98trunc and TNNT2 p.K217del mutation showed reduced expression of troponin I to 39% and 51%, troponin T to 64% and 53%, and troponin C to 73% and 97% of controls, respectively, and altered stoichiometry between the three cardiac troponin subunits. The TNNI3 p.98trunc showed pure haploinsufficiency, increased Ca 2+ -sensitivity and impaired length-dependent activation. The TNNT2 p.K217del mutation showed a significant increase in passive tension that was not due to changes in titin isoform composition or phosphorylation. Exchange with wild-type troponin complex corrected troponin protein levels to 83% of controls in the TNNI3

  11. Genotype‐specific pathogenic effects in human dilated cardiomyopathy

    Science.gov (United States)

    Schuldt, Maike; Harakalova, Magdalena; Vink, Aryan; Asselbergs, Folkert W.; Pinto, Jose R.; Krüger, Martina; Kuster, Diederik W. D.; van der Velden, Jolanda

    2017-01-01

    Key points Mutations in genes encoding cardiac troponin I (TNNI3) and cardiac troponin T (TNNT2) caused altered troponin protein stoichiometry in patients with dilated cardiomyopathy. TNNI3p.98trunc resulted in haploinsufficiency, increased Ca2+‐sensitivity and reduced length‐dependent activation. TNNT2p.K217del caused increased passive tension.A mutation in the gene encoding Lamin A/C (LMNA p.R331Q) led to reduced maximal force development through secondary disease remodelling in patients suffering from dilated cardiomyopathy.Our study shows that different gene mutations induce dilated cardiomyopathy via diverse cellular pathways. Abstract Dilated cardiomyopathy (DCM) can be caused by mutations in sarcomeric and non‐sarcomeric genes. In this study we defined the pathogenic effects of three DCM‐causing mutations: the sarcomeric mutations in genes encoding cardiac troponin I (TNNI3p.98truncation) and cardiac troponin T (TNNT2p.K217deletion; also known as the p.K210del) and the non‐sarcomeric gene mutation encoding lamin A/C (LMNAp.R331Q). We assessed sarcomeric protein expression and phosphorylation and contractile behaviour in single membrane‐permeabilized cardiomyocytes in human left ventricular heart tissue. Exchange with recombinant troponin complex was used to establish the direct pathogenic effects of the mutations in TNNI3 and TNNT2. The TNNI3p.98trunc and TNNT2p.K217del mutation showed reduced expression of troponin I to 39% and 51%, troponin T to 64% and 53%, and troponin C to 73% and 97% of controls, respectively, and altered stoichiometry between the three cardiac troponin subunits. The TNNI3p.98trunc showed pure haploinsufficiency, increased Ca2+‐sensitivity and impaired length‐dependent activation. The TNNT2p.K217del mutation showed a significant increase in passive tension that was not due to changes in titin isoform composition or phosphorylation. Exchange with wild‐type troponin complex corrected troponin protein levels to 83% of

  12. Achalasia with massive oesophageal dilation causing tracheomalacia and asthma symptoms

    Directory of Open Access Journals (Sweden)

    Ana Gomez-Larrauri

    Full Text Available Achalasia is an uncommon oesophageal motor disorder characterized by failure of relaxation of the lower oesophageal sphincter and muscle hypertrophy, resulting in a loss of peristalsis and a dilated oesophagus. Gastrointestinal symptoms are invariably present in all cases of achalasia observed in adults. We report a case of a 34 year-old female patient with long standing history of asthma-like symptoms, labelled as uncontrolled and steroid resistant asthma with no gastrointestinal manifestations. Thoracic CT scan revealed a massive oesophagus due to achalasia, which caused severe tracheomalacia as a result of tracheal compression. Her symptoms regressed completely after a laparoscopic Heller myotomy surgery intervention.

  13. Magnetic resonance evaluation for small bowel strictures in Crohn's disease: comparison with balloon enteroscopy.

    Science.gov (United States)

    Takenaka, Kento; Ohtsuka, Kazuo; Kitazume, Yoshio; Matsuoka, Katsuyoshi; Fujii, Toshimitsu; Nagahori, Masakazu; Kimura, Maiko; Fujioka, Tomoyuki; Araki, Akihiro; Watanabe, Mamoru

    2017-08-01

    Magnetic resonance (MR) imaging is the recommended technique for detection of small bowel lesions in Crohn's disease. We aimed to evaluate the impact of stricture findings obtained by MR imaging on patient outcomes using balloon-assisted enteroscopy (BAE) as a reference. Two hundred Crohn's disease patients undergoing both MR enterocolonography and BAE were prospectively followed up for at least 1 year. The presence of strictures detected by MR enterocolonography was compared with endoscopic findings. Moreover, the relationship between MR findings and surgery was evaluated. The accuracy of MR imaging for detection of small bowel strictures was defined by a sensitivity of 60.6% and a specificity of 93.4%. Major strictures (diameter less than 10 mm or with internal fistula), long strictures (length 10 mm or greater), and prestenotic dilatation were predictors of stricture detection by MR imaging (P = 0.001, 0.017, and 0.002 respectively). Surgery was performed in 31.6% of patients (18 of 57) in the MR-positive-BAE-positive stricture group and in 10.8% of patients (4 of 37) in the MR-negative-BAE-positive stricture group. Multiple regression analysis showed MR-positive-BAE-positive strictures were an independent risk factor for surgery (P = 0.002 at 6 months and P < 0.001 at 1 year). The surgery-free rate in the MR-negative-BAE-positive stricture group was significantly lower than that in nonstricture group at 1 year (P = 0.001). The specificity of MR imaging for detection of small bowel strictures was clinically sufficient, and the MR procedure could detect critical strictures, which was a predictive factor for surgery. But MR-negative-BAE-positive strictures were also associated with an increased risk compared with no strictures after 1 year of follow-up.

  14. National Report on the NASA Sounding Rocket and Balloon Programs

    Science.gov (United States)

    Eberspeaker, Philip; Fairbrother, Debora

    2013-01-01

    The U. S. National Aeronautics and Space Administration (NASA) Sounding Rockets and Balloon Programs conduct a total of 30 to 40 missions per year in support of the NASA scientific community and other users. The NASA Sounding Rockets Program supports the science community by integrating their experiments into the sounding rocket payloads, and providing both the rocket vehicle and launch operations services. Activities since 2011 have included two flights from Andoya Rocket Range, more than eight flights from White Sands Missile Range, approximately sixteen flights from Wallops Flight Facility, two flights from Poker Flat Research Range, and four flights from Kwajalein Atoll. Other activities included the final developmental flight of the Terrier-Improved Malemute launch vehicle, a test flight of the Talos-Terrier-Oriole launch vehicle, and a host of smaller activities to improve program support capabilities. Several operational missions have utilized the new Terrier-Malemute vehicle. The NASA Sounding Rockets Program is currently engaged in the development of a new sustainer motor known as the Peregrine. The Peregrine development effort will involve one static firing and three flight tests with a target completion data of August 2014. The NASA Balloon Program supported numerous scientific and developmental missions since its last report. The program conducted flights from the U.S., Sweden, Australia, and Antarctica utilizing standard and experimental vehicles. Of particular note are the successful test flights of the Wallops Arc Second Pointer (WASP), the successful demonstration of a medium-size Super Pressure Balloon (SPB), and most recently, three simultaneous missions aloft over Antarctica. NASA continues its successful incremental design qualification program and will support a science mission aboard WASP in late 2013 and a science mission aboard the SPB in early 2015. NASA has also embarked on an intra-agency collaboration to launch a rocket from a balloon to

  15. Generalised ballooning theory of two-dimensional tokamak modes

    Science.gov (United States)

    Abdoul, P. A.; Dickinson, D.; Roach, C. M.; Wilson, H. R.

    2018-02-01

    In this work, using solutions from a local gyrokinetic flux-tube code combined with higher order ballooning theory, a new analytical approach is developed to reconstruct the global linear mode structure with associated global mode frequency. In addition to the isolated mode (IM), which usually peaks on the outboard mid-plane, the higher order ballooning theory has also captured other types of less unstable global modes: (a) the weakly asymmetric ballooning theory (WABT) predicts a mixed mode (MM) that undergoes a small poloidal shift away from the outboard mid-plane, (b) a relatively more stable general mode (GM) balloons on the top (or bottom) of the tokamak plasma. In this paper, an analytic approach is developed to combine these disconnected analytical limits into a single generalised ballooning theory. This is used to investigate how an IM behaves under the effect of sheared toroidal flow. For small values of flow an IM initially converts into a MM where the results of WABT are recaptured, and eventually, as the flow increases, the mode asymptotically becomes a GM on the top (or bottom) of the plasma. This may be an ingredient in models for understanding why in some experimental scenarios, instead of large edge localised modes (ELMs), small ELMs are observed. Finally, our theory can have other important consequences, especially for calculations involving Reynolds stress driven intrinsic rotation through the radial asymmetry in the global mode structures. Understanding the intrinsic rotation is significant because external torque in a plasma the size of ITER is expected to be relatively low.

  16. Cryo-balloon catheter position planning using AFiT

    Science.gov (United States)

    Kleinoeder, Andreas; Brost, Alexander; Bourier, Felix; Koch, Martin; Kurzidim, Klaus; Hornegger, Joachim; Strobel, Norbert

    2012-02-01

    Atrial fibrillation (AFib) is the most common heart arrhythmia. In certain situations, it can result in life-threatening complications such as stroke and heart failure. For paroxsysmal AFib, pulmonary vein isolation (PVI) by catheter ablation is the recommended choice of treatment if drug therapy fails. During minimally invasive procedures, electrically active tissue around the pulmonary veins is destroyed by either applying heat or cryothermal energy to the tissue. The procedure is usually performed in electrophysiology labs under fluoroscopic guidance. Besides radio-frequency catheter ablation devices, so-called single-shot devices, e.g., the cryothermal balloon catheters, are receiving more and more interest in the electrophysiology (EP) community. Single-shot devices may be advantageous for certain cases, since they can simplify the creation of contiguous (gapless) lesion sets around the pulmonary vein which is needed to achieve PVI. In many cases, a 3-D (CT, MRI, or C-arm CT) image of a patient's left atrium is available. This data can then be used for planning purposes and for supporting catheter navigation during the procedure. Cryo-thermal balloon catheters are commercially available in two different sizes. We propose the Atrial Fibrillation Planning Tool (AFiT), which visualizes the segmented left atrium as well as multiple cryo-balloon catheters within a virtual reality, to find out how well cryo-balloons fit to the anatomy of a patient's left atrium. First evaluations have shown that AFiT helps physicians in two ways. First, they can better assess whether cryoballoon ablation or RF ablation is the treatment of choice at all. Second, they can select the proper-size cryo-balloon catheter with more confidence.

  17. Embolization of carotid-cavernous fistula using a silicone balloon and a tracker-catheter system

    International Nuclear Information System (INIS)

    Kim, Sun Yong; Cho, Kil Ho; Park, Bok Hwan

    1992-01-01

    With the recent introduction and development of the detachable balloon system, it has become the treatment of choice in the management of carotid cavernous fistulas(CCFs). But, since most delivery systems for embolization of CCF mainly depend on flow guidance for balloon delivery, in case of small fistula, pseudo aneurysm and arterialized venous collaterals, failure of balloon embolization can occur. To overcome these limitation, the authors designed and used a new versatile, steerable, and flow-guided detachable balloon system by using a Tracker catheter system with silicone or latex balloons. Using this maneuver, we could get successful fistula occlusion in 7 out of 8 patients (silicone balloon). But in one case, we had to occlude the internal carotid artery at the fistula site, proximal and distal cervical portions of the internal carotid artery. This balloon delivery system proved to provide high selectivity for fistula and relatively ease of handing

  18. Dilatation of aortic grafts over time: what to expect and when to be concerned

    DEFF Research Database (Denmark)

    Schroeder, Torben V; Eldrup, Nikolaj; Just, Sven

    2009-01-01

    insertion of a woven polyester or expanded polytetrafluoroethylene (ePTFE) graft. Patients were followed with computed tomography and ultrasonography for up to 5 years in order to assess the frequency and magnitude of postoperative dilatation. Graft dilatation was documented in patients with polyester...... grafts at 12 months. Thereafter and up to 60 months, polyester grafts did not dilate further. After 5 years, polyester prostheses had dilated by 25% and ePTFE by 12.5%, as determined by computed tomography imaging. These observations suggest that dilatation of prosthetic grafts is more frequent...... with knitted polyester grafts compared with ePTFE. Dilatation occurs within the first year after implantation and can be, in part, explained by a discrepancy between the initial nominal graft diameter and its diameter after clamp release, probably due to an in vivo adaptation of the textile structure...

  19. Cognitive effort and pupil dilation in controlled and automatic processes.

    Science.gov (United States)

    Querino, Emanuel; Dos Santos, Lafaiete; Ginani, Giuliano; Nicolau, Eduardo; Miranda, Débora; Romano-Silva, Marco; Malloy-Diniz, Leandro

    2015-01-01

    The Five Digits Test (FDT) is a Stroop paradigm test that aims to evaluate executive functions. It is composed of four parts, two of which are related to automatic and two of which are related to controlled processes. It is known that pupillary diameter increases as the task's cognitive demand increases. In the present study, we evaluated whether the pupillary diameter could distinguish cognitive effort between automated and controlled cognitive processing during the FDT as the task progressed. As a control task, we used a simple reading paradigm with a similar visual aspect as the FDT. We then divided each of the four parts into two blocks in order to evaluate the differences between the first and second half of the task. Results indicated that, compared to a control task, the FDT required higher cognitive effort for each consecutive part. Moreover, the first half of every part of the FDT induced dilation more than the second. The differences in pupil dilation during the first half of the four FDT parts were statistically significant between the parts 2 and 4 (p=0.023), and between the parts 3 and 4 (p=0.006). These results provide further evidence that cognitive effort and pupil diameter can distinguish controlled from automatic processes.

  20. Laryngotracheal Stenosis: Risk Factors for Tracheostomy Dependence and Dilation Interval

    Science.gov (United States)

    Gadkaree, Shekhar K; Pandian, Vinciya; Best, Simon; Motz, Kevin M; Allen, Clint; Kim, Young; Akst, Lee; Hillel, Alexander T

    2017-02-01

    Objective Laryngotracheal stenosis (LTS) is a fibrotic process that narrows the upper airway and has a significant impact on breathing and phonation. Iatrogenic injury from endotracheal and/or tracheostomy tubes is the most common etiology. This study investigates differences in LTS etiologies as they relate to tracheostomy dependence and dilation interval. Study Design Case series with chart review. Setting Single-center tertiary care facility. Subjects and Methods Review of adult patients with LTS was performed between 2004 and 2015. The association of patient demographics, comorbidities, disease etiology, and treatment modalities with patient outcomes was assessed. Multiple logistic regression analysis and Kaplan-Meier analysis were performed to determine factors associated with tracheostomy dependence and time to second procedure, respectively. Results A total of 262 patients met inclusion criteria. Iatrogenic patients presented with greater stenosis ( P = .023), greater length of stenosis ( P = .004), and stenosis farther from the vocal folds ( P tracheostomy dependence. Nonsmokers, patients without tracheostomy, and idiopathic LTS patients had a significantly longer time to second dilation procedure. Conclusion Iatrogenic LTS presents with a greater disease burden and higher risk of tracheostomy dependence when compared with other etiologies of LTS. Comorbid conditions promoting microvascular injury-including smoking, COPD, and diabetes-were prevalent in the iatrogenic cohort. Changes in hospital practice patterns to promote earlier tracheostomy in high-risk patients could reduce the incidence of LTS.