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Sample records for aortic balloon pump

  1. Intestinal cholesterol embolism resulting from intra-aortic balloon pumping: a case report

    OpenAIRE

    Yamaguchi, Satoshi; Kakazu, Masanori; Osamu, Arasaki

    2014-01-01

    Introduction Intra-aortic balloon pumping is used in elective percutaneous coronary intervention for increasing coronary blood flow. However, intra-aortic balloon pumping may decrease visceral blood flow and cause mesenteric ischemia by visceral artery obstruction. Case presentation We report the case of a 79-year-old Asian man in whom elective percutaneous coronary intervention was performed with intra-aortic balloon pumping. He died from mesenteric ischemia 25 hours after the procedure. Mic...

  2. Loss of Guide Wire: A Rare Complication of Intra-Aortic Balloon Pump Insertion

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    Manouchehr Hekmat

    2015-10-01

    Full Text Available At the final stages of a coronary artery bypass graft operation on a 64-year-old man, an experienced physician attempted to insert an intra-aortic balloon pump into the femoral artery via the Seldinger technique. However, while the balloon pump was being passed over the guide wire, the latter was completely lost.The guide wire should be held at the tip at all times to prevent passage into the vessel. Strict adherence to this rule will prevent guide-wire loss, which is, albeit rare and completely avoidable, a potentially life-threatening complication of central vein or artery catheterization, with reported fatality rates of up to 20% when the whole wire is lost. The literature contains several reports on guide-wire loss during central venous, arterial, and hemodialysis catheterization, but we report for the first time the loss of a guide wire as a rare complication of intra-aortic balloon pump insertion.

  3. Undiagnosed aortic dissection in patient with intra-aortic balloon pump.

    Science.gov (United States)

    Raut, Monish S; Maheshwari, Arun; Sharma, Manish

    2016-01-01

    60 years old lady presented with chest pain and was admitted in local hospital. Electrocardiogram was suggestive of anterior myocardial ischemia. Patient underwent coronary angiography which revealed severe triple vessles coronary artery disease. As patient was hemodynamically unstable and in cardiogenic shock, intraaortic balloon pump was inserted .IABP augmented diastolic blood pressure was less than unassisted systolic blood pressure despite setting maximum augmentation on IABP machine. PMID:27397468

  4. Undiagnosed aortic dissection in patient with intra-aortic balloon pump

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    Monish S Raut

    2016-01-01

    Full Text Available 60 years old lady presented with chest pain and was admitted in local hospital. Electrocardiogram was suggestive of anterior myocardial ischemia. Patient underwent coronary angiography which revealed severe triple vessles coronary artery disease. As patient was hemodynamically unstable and in cardiogenic shock, intraaortic balloon pump was inserted .IABP augmented diastolic blood pressure was less than unassisted systolic blood pressure despite setting maximum augmentation on IABP machine.

  5. Undiagnosed aortic dissection in patient with intra-aortic balloon pump

    OpenAIRE

    Monish S Raut; Arun Maheshwari; Manish Sharma

    2016-01-01

    60 years old lady presented with chest pain and was admitted in local hospital. Electrocardiogram was suggestive of anterior myocardial ischemia. Patient underwent coronary angiography which revealed severe triple vessles coronary artery disease. As patient was hemodynamically unstable and in cardiogenic shock, intraaortic balloon pump was inserted .IABP augmented diastolic blood pressure was less than unassisted systolic blood pressure despite setting maximum augmentation on IABP machine.

  6. Virtual 5-French intra-aortic pumping using a Glidesheath Slender and 6-French intra-aortic balloon catheter

    Energy Technology Data Exchange (ETDEWEB)

    Takahashi, Akihiko, E-mail: a-takahashi@wine.ocn.ne.jp; Taniguchi, Norimasa; Mizuguchi, Yukio; Yamada, Takeshi; Nakajima, Shunsuke; Hashimoto, Sho; Hata, Tetsuya

    2015-07-15

    Objectives: The aim of this study was to evaluate the feasibility and safety of the 6-Fr Glidesheath Slender, which has equivalent outer size to the conventional 5-Fr sheath, for use with the 6-Fr intra-aortic balloon pump (IABP) catheter. Methods: Between May 2014 and March 2015, 24 patients with acute coronary syndrome underwent percutaneous coronary intervention using a 6-Fr IABP catheter through a 6-Fr Glidesheath Slender for support. The adverse events, including access site complications, kinking of the sheath during the procedure, and any evidence of balloon pump failure, were retrospectively investigated. Results: Insertion of the IABP catheter through either the femoral or brachial artery was successful in all patients. The mean support time was 32.4 ± 22.0 h. No major hemorrhagic event or severe limb ischemia was observed. Kinking of the shaft occurred during insertion in one patient; however, the subsequent balloon pumping was well maintained and did not require exchange of the sheath or IABP catheter. No kind of IABP failure was observed. Conclusion: Although this sheath was originally designed to allow radial access, our results suggest that the use of the Glidesheath Slender is feasible for insertion of the 6-Fr IABP catheter through the brachial and femoral arteries, and may reduce vascular complications in patients who undergo percutaneous coronary intervention.

  7. Virtual 5-French intra-aortic pumping using a Glidesheath Slender and 6-French intra-aortic balloon catheter

    International Nuclear Information System (INIS)

    Objectives: The aim of this study was to evaluate the feasibility and safety of the 6-Fr Glidesheath Slender, which has equivalent outer size to the conventional 5-Fr sheath, for use with the 6-Fr intra-aortic balloon pump (IABP) catheter. Methods: Between May 2014 and March 2015, 24 patients with acute coronary syndrome underwent percutaneous coronary intervention using a 6-Fr IABP catheter through a 6-Fr Glidesheath Slender for support. The adverse events, including access site complications, kinking of the sheath during the procedure, and any evidence of balloon pump failure, were retrospectively investigated. Results: Insertion of the IABP catheter through either the femoral or brachial artery was successful in all patients. The mean support time was 32.4 ± 22.0 h. No major hemorrhagic event or severe limb ischemia was observed. Kinking of the shaft occurred during insertion in one patient; however, the subsequent balloon pumping was well maintained and did not require exchange of the sheath or IABP catheter. No kind of IABP failure was observed. Conclusion: Although this sheath was originally designed to allow radial access, our results suggest that the use of the Glidesheath Slender is feasible for insertion of the 6-Fr IABP catheter through the brachial and femoral arteries, and may reduce vascular complications in patients who undergo percutaneous coronary intervention

  8. The management of impending myocardial infarction using coronary artery by-pass grafting and an intra-aortic balloon pump.

    Science.gov (United States)

    Harris, P L; Woollard, K; Bartoli, A; Makey, A R

    1980-01-01

    Of 33 patients with impending myocardial infarction 25 were treated using a combination of coronary artery by-pass grafting and intra-aortic balloon pumping. Eight patients were treated with coronary artery by-pass grafting alone. Twenty-two of the 25 patients who were treated with the combined technique made a full recovery. Three patients sustained definite myocardial infarctions and one of these died. Five of the 8 patients treated by grafting alone suffered infarction and of these 3 died. The value of intra-aortic balloon pumping in combination with coronary artery by-pass grafting in the management of impending myocardial infarction is discussed. PMID:6968314

  9. Flecainide overdose – support using an intra-aortic balloon pump

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    Brown Peter D

    2005-12-01

    Full Text Available Abstract Background Flecainide is an antiarrhythmic agent which is being used increasingly for the management of super-ventricular arrhythmias. Overdose with flecainide is frequently fatal with mortality reported as high as 22% due to arrhythmias, myocardial depression and conduction defects leading to electro-mechanical dissociation and asytole. Supportive measures are often required during the case and previously have included inotropes, extracorporeal membrane oxygenation and cardiopulmonary bypass. Case presentation A 47 year old lady presented to the emergency department with a four hour history of severe central chest pain. Her ECG showed atrial fibrillation and broad QRS complexes with a sine wave appearance. She had a past history of paroxysmal atrial fibrillation and significant psychiatric history. Following thrombolysis for a presumed myocardial infarction she developed cardiogenic shock with severely impaired left ventricular function. An intra-aortic balloon pump was inserted and coronary angiography demonstrated normal coronary arteries. With inotropic support she improved over 48 hours, with both her QRS duration and left ventricular function returning to normal. Biochemical testing following her discharge demonstrated significantly elevated levels of flecainide. Conclusion The use of an intra-aortic balloon pump is a useful supportive measure during the acute phase of flecainide overdose associated with severe myocardial depression.

  10. The Effects of Intra-Aortic Balloon Pump Support on Macrocirculation and Tissue Microcirculation in Patients with Cardiogenic Shock

    NARCIS (Netherlands)

    C.A. den Uil; W.K. Lagrand; M. van der Ent; L.S.D. Jewbali; J.J. Brugts; P.E. Spronk; M.L. Simoons

    2009-01-01

    Objectives: It was the aim of this study to evaluate the effects of intra-aortic balloon pump (IABP) counterpulsation on sublingual microcirculation as a model for tissue perfusion. Methods: In 13 patients with cardiogenic shock treated with IABP, the IABP assist ratio was reduced from 1: 1 to 1: 8

  11. [Intra-aortic balloon pump (IABP) counterpulsation. Do we still need it and if so when?].

    Science.gov (United States)

    Russ, M

    2015-09-01

    Intra-aortic balloon pump (IABP) counterpulsation was for a long time considered to be an indispensable standard for support of drug therapy for all forms of acute left-sided cardiac failure and especially in cardiogenic shock due to infarction. The advantages of the system seemed to be obvious; however, many of the postulated effects on the hemodynamics, microcirculation and coronary perfusion could not be confirmed later in prospective studies. It was found that IABP had no influence on microcirculation disorders in cardiogenic shock due to infarction. In a meta-analysis on the application for acute myocardial infarction without shock, no effect was found on mortality. The benefit as adjunct therapy for percutaneous coronary interventions (PCI) in cardiogenic shock due to infarction places a question mark over both IABP-SHOCK studies; however, in constellations without PCI the additional benefit of IABP cannot be excluded which is why the procedure could be an option in this situation. PMID:26340798

  12. The effectiveness of intra-aortic balloon pump for myocardial infarction in patients with or without cardiogenic shock: a meta-analysis and systematic review

    OpenAIRE

    Zheng, Xiao-yun; Wang, Yi; Chen, Yi; Wang, Xi; Chen, Lei; Li, Jun; Zheng, Zhi-gang

    2016-01-01

    Background Conflicting reports on the efficacy of intra-aortic balloon pump (IABP) during percutaneous coronary intervention (PCI) incited us to evaluate the utility of IABP in patients with acute myocardial infarction (AMI). Methods Randomized clinical trials comparing patients, who received IABP vs. control (no IABP) during PCI, were hand-searched from MEDLINE, Cochrane, and EMBASE databases using the terms “intra-aortic balloon pump, percutaneous coronary intervention, myocardial infarctio...

  13. Clinical efficacy of intra-aortic balloon pumping in treating patients with acute myocardial infarction with left main coronary artery disease

    Institute of Scientific and Technical Information of China (English)

    赵昕

    2012-01-01

    Objective To evaluate the efficacy and safety of intra-aortic balloon pump(IABP) counter pulsation in the treatment of ST-segment elevation myocardial infarction(STEMI) with concurrent left main coronary artery(LM-CA) disease. Methods A retrospective analysis was performed

  14. The need for intra aortic balloon pump support following open heart surgery: risk analysis and outcome.

    LENUS (Irish Health Repository)

    Parissis, Haralabos

    2010-01-01

    BACKGROUND: The early and intermediate outcome of patients requiring intraaortic balloon pump (IABP) was studied in a cohort of 2697 adult cardiac surgical patients. METHODS: 136 patients requiring IABP (5.04%) support analysed over a 4 year period. Prospective data collection, obtained. RESULTS: The overall operative mortality was 35.3%. The "operation specific" mortality was higher on the Valve population.The mortality (%) as per time of balloon insertion was: Preoperative 18.2, Intraoperative 33.3, postoperative 58.3 (p < 0.05).The incremental risk factors for death were: Female gender (Odds Ratio (OR) = 3.87 with Confidence Intervals (CI) = 1.3-11.6), Smoking (OR = 4.88, CI = 1.23- 19.37), Preoperative Creatinine>120 (OR = 3.3, CI = 1.14-9.7), Cross Clamp time>80 min (OR = 4.16, CI = 1.73-9.98) and IABP insertion postoperatively (OR = 19.19, CI = 3.16-116.47).The incremental risk factors for the development of complications were: Poor EF (OR = 3.16, CI = 0.87-11.52), Euroscore >7 (OR = 2.99, CI = 1.14-7.88), history of PVD (OR = 4.99, CI = 1.32-18.86).The 5 years survival was 79.2% for the CABG population and 71.5% for the valve group. (Hazard ratio = 1.78, CI = 0.92-3.46). CONCLUSIONS: IABP represents a safe option of supporting the failing heart. The need for IABP especially in a high risk Valve population is associated with early unfavourable outcome, however the positive mid term results further justify its use.

  15. Temporal Trends of In-Hospital Mortality in Patients Treated with Intra-Aortic Balloon Pumping: A Nationwide Population Study in Taiwan, 1998-2008.

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    Chung-Han Ho

    Full Text Available Intra-aortic balloon pumping (IABP is widely used for hemodynamic support in critical patients with cardiogenic shock (CS. We examined whether the in-hospital mortality of patients in Taiwan treated with IABP has recently declined. We used Taiwan's National Health Insurance Research Database to retrospectively review the in-hospital all-cause mortality of 9952 (7146 men [71.8%] 18-year-old and older patients treated with IABP between 1998 and 2008. The mortality rate was 13.84% (n = 1377. The urbanization levels of the hospitals, and the number of days in the intensive care unit, of hospitalization, and of IABP treatment, and prior percutaneous coronary intervention (PCI were associated with mortality. Seven thousand six hundred thirty-five patients (76.72% underwent coronary artery bypass grafting (CABG surgery, and 576 (5.79% underwent high-risk PCI with IABP treatment. The number of patients treated with IABP significantly increased during this decade (ptrend < 0.0001, the in-hospital all-cause mortality for patients treated with IABP significantly decreased (ptrend = 0.0243, but the in-hospital all-cause mortality of patients who underwent CABG and PCI plus IABP did not decrease. In conclusion, the in-hospital mortality rate of IABP treatment decreased annually in Taiwan during the study period. However, high-risk patients who underwent coronary revascularization with IABP had a higher and unstable in-hospital mortality rate.

  16. Clinical therapeutic efficacy of intra-aortic balloon pump as an adjuvant treatment after percutaneous coronary intervention in patients with coronary heart disease associated with chronic kidney disease

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    Zi-lan JING

    2015-06-01

    Full Text Available Objective To explore the clinical efficacy of intra-aortic balloon pump (IABP as an auxiliary treatment of percutaneous coronary intervention (PCI in patients with coronary heart disease (CHD associated with chronic kidney disease. Methods One hundred and twenty CHD patients with concomitant chronic kidney disease and receiving PCI in our hospital from Jan. 2000 to Jul. 2014, and 123 simple CHD patients without renal dysfunction, who had undergone PCI with concomitant IABP for the cardiac pump failure, cardiogenic shock, acute left heart failure, unstable angina pectoris (UP which was not allayed by medical treatment, or acute myocardial infarction (AMI, were selected for observation of preoperative condition, in-hospital mortality and prognosis of patients in two groups. Results There was no statistically significant difference in general clinical data including gender, age, and concomitant hypertension and diabetes, and preoperative blood lipid, AST, D-dimer, APTT, and international normalized ratio (INR showed also no statistically significant difference before surgery between two groups of patients (P>0.05. The difference in proportion of AMI, the left main trunk and (or three-branches involvement was of no statistical significance (P>0.05, but there was significant difference in the incidence of previous myocardial infarction, TnT, CK-MB, Cr, BUN, stent number, IABP application time (P0.05 between the two groups. Logistic regression analysis revealed that diabetes and the number of stents were independent risk factors for in-hospital and long-term mortalities. Conclusions By means of the effective cardiac assistance of IABP, CHD patients with renal insufficiency have the same short and long term clinical prognosis as simple CHD patients without renal dysfunction who has undergone PCI. Diabetes and the number of stents are independent risk factors for in-hospital and 1-year mortality. DOI: 10.11855/j.issn.0577-7402.2015.04.03

  17. Intraaortic Balloon Pump Counterpulsation and Cerebral Autoregulation: an observational study

    OpenAIRE

    Boots Rob; Barnett Adrian G; Timms Daniel; Dunster Kimble; Geng Shureng; Bellapart Judith; Fraser John F

    2010-01-01

    Abstract Background The use of Intra-aortic counterpulsation is a well established supportive therapy for patients in cardiac failure or after cardiac surgery. Blood pressure variations induced by counterpulsation are transmitted to the cerebral arteries, challenging cerebral autoregulatory mechanisms in order to maintain a stable cerebral blood flow. This study aims to assess the effects on cerebral autoregulation and variability of cerebral blood flow due to intra-aortic balloon pump and in...

  18. Efficacy of Intra-aortic Balloon Pump before versus after Primary Percutaneous Coronary Intervention in Patients with Cardiogenic Shock from ST-elevation Myocardial Infarction

    Science.gov (United States)

    Yuan, Lin; Nie, Shao-Ping

    2016-01-01

    Background: Previous studies showed that patients with cardiogenic shock (CS) from ST-elevation acute myocardial infarction (STEMI) supported by intra-aortic balloon pump (IABP) before primary percutaneous coronary intervention (PCI) decreased the risk of in-hospital mortality than patients who received IABP after PCI. However, little evidence is available on the optimal order of IABP insertion and primary PCI. The aim of this study was to investigate the impact of the sequence of IABP support and PCI and its association with major adverse cardiac and cerebrovascular events (MACCEs). Methods: Data were obtained from 218 consecutive patients with CS due to STEMI in Beijing Anzhen Hospital between 2008 and 2014, who were treated with IABP and PCI. The patients were divided into two groups: Group A in whom IABP received before PCI (n = 106) and Group B in whom IABP received after PCI (n = 112). We evaluated the myocardial perfusion using myocardial blush grade and resolution of ST-segment elevation. The primary endpoint was 12-month risk of MACCE. Results: Most baseline characteristics were similar in patients between the two groups. However, patients received IABP before PCI were associated with a delay of door-to-balloon time (DBT) and higher troponin I level (P 0.05). In addition, risk of all-cause mortality, bleeding, and acute kidney injury (AKI) was similar between two groups (P > 0.05). Multivariate analysis showed that DBT (odds ratio [OR] 2.5, 95% confidence interval [CI] 1.1–4.8, P = 0.04), IABP support after PCI (OR 5.7, 95% CI 2.7–8.4, P = 0.01), and AKI (OR 7.4, 95% CI 4.9–10.8, P = 0.01) were the independent predictors of mortality at 12-month follow-up. Conclusions: Early IABP insertion before primary PCI is associated with improved myocardial perfusion although DBT increases. IABP support before PCI does not confer a 12-month clinical benefit when used for STEMI with CS. PMID:27270533

  19. Efficacy of Intra-aortic Balloon Pump before versus after Primary Percutaneous Coronary Intervention in Patients with Cardiogenic Shock from ST-elevation Myocardial Infarction

    Institute of Scientific and Technical Information of China (English)

    Lin Yuan; Shao-Ping Nie

    2016-01-01

    Background:Previous studies showed that patients with cardiogenic shock (CS) from ST-elevation acute myocardial infarction (STEMI) supported by intra-aortic balloon pump (IABP) before primary percutaneous coronary intervention (PCI) decreased the risk of in-hospital mortality than patients who received IABP after PCI.However,little evidence is available on the optimal order of IABP insertion and primary PCI.The aim of this study was to investigate the impact of the sequence of IABP support and PCI and its association with major adverse cardiac and cerebrovascular events (MACCEs).Methods:Data were obtained from 218 consecutive patients with CS due to STEMI in Beijing Anzhen Hospital between 2008 and 2014,who were treated with IABP and PCI.The patients were divided into two groups:Group A in whom IABP received before PCI (n =106)and Group B in whom IABP received after PCI (n =112).We evaluated the myocardial perfusion using myocardial blush grade and resolution of ST-segment elevation.The primary endpoint was 12-month risk of MACCE.Results:Most baseline characteristics were similar in patients between the two groups.However,patients received IABP before PCI were associated with a delay of door-to-balloon time (DBT) and higher troponin Ⅰ level (P < 0.05).However,myocardial perfusion was significantly improved in patients treated with IABP before PCI (P < 0.05).Overall,IABP support before PCI was not associated with significantly lower risk of MACCE (P > 0.05).In addition,risk of all-cause mortality,bleeding,and acute kidney injury (AKI)was similar between two groups (P > 0.05).Multivariate analysis showed that DBT (odds ratio [OR] 2.5,95% confidence interval [CI]1.1-4.8,P=0.04),IABP support after PCI (OR 5.7,95% CI 2.7-8.4,P=0.01),and AKI (OR 7.4,95% CI 4.9-10.8,P=0.01) were the independent predictors of mortality at 12-month follow-up.Conclusions:Early IABP insertion before primary PCI is associated with improved myocardial perfusion although DBT

  20. [Intra-graft balloon pumping--a clinical case report].

    Science.gov (United States)

    Nagata, M; Tashiro, T; Tanaka, K; Haruta, Y; Todo, K

    1991-12-01

    A 29-year-old female underwent tube graft replacement of distal aortic arch and descending aorta for dissecting aneurysm. After 42 minutes of aortic cross-clamping the patient was initially weaned satisfactorily from cardiopulmonary bypass (CPB). However, cardiac arrhythmia and cardiac arrest necessitated reestablishment of CPB. Electro-cardiography showed inferior myocardial infarction. To wean CPB intraaortic balloon pumping (IABP) was mandatory. But because of dissecting aortic aneurysm IABP in conventional method was contra-indicated. Intra graft balloon pumping (IGBP) was initiated while the patient was on full CPB. A low-porosity woven Dacron tube graft (22 mm) was anastomosed end-to-side to ascending aorta. A balloon was inserted into the tube graft to establish IGBP. This IGBP provided effective circulatory assist. The patient was weaned from CPB 1 hours after reestablishment of IGBP. Postoperative course was stable. The patient was returned to the operating room for removal of the balloon 3 days postoperatively. We reported the case for whom IGBP was effective. IGBP was effective circulatory support for the patient when conventional use of IABP was contra-indicated. PMID:1774515

  1. Open surgical repair of abdominal aortic aneurysm: Proximal aortic control by endoaortic balloon - A novel approach

    OpenAIRE

    Balakrishnan Soundaravalli; Palaniappan, M.; Rajani Sundar; Chandrasekar, P.

    2012-01-01

    Patients with infrarenal abdominal aortic aneurysm with unfavorable anatomy for endovascular aneurysm repair have to undergo open surgical repair. Open surgery has its own morbidity in terms of proximal clamping and declamping, bleeding and prolonged hospital stay and mortality. We present two such patients with juxtarenal abdominal aortic aneurysm who underwent open surgical repair. The proximal aortic control during open surgical repair of the aneurysm was achieved by endoaortic balloon occ...

  2. Open surgical repair of abdominal aortic aneurysm: Proximal aortic control by endoaortic balloon - A novel approach

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    Balakrishnan Soundaravalli

    2012-01-01

    Full Text Available Patients with infrarenal abdominal aortic aneurysm with unfavorable anatomy for endovascular aneurysm repair have to undergo open surgical repair. Open surgery has its own morbidity in terms of proximal clamping and declamping, bleeding and prolonged hospital stay and mortality. We present two such patients with juxtarenal abdominal aortic aneurysm who underwent open surgical repair. The proximal aortic control during open surgical repair of the aneurysm was achieved by endoaortic balloon occlusion technique.

  3. Desenvolvimento de um projeto para construção de bomba-balão para contrapulsação aórtica Development and construction of a balloon-pump for aortic counterpulsation

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    Celso Luiz dos Reis

    1989-12-01

    Full Text Available O presente trabalho tem por finalidade apresentar as etapas de um projeto para construção de uma bomba-balâo para contrapulsação aórtica. Desenvolveram-se três protótipos, sendo que os dois primeiros utilizavam ar comprimido e vácuo hospitalares para insuflação e deflação do cateter-balão. Esses dois protótipos apresentavam como diferenças fundamentais: o tipo de dispositivo que captava o sinal luminoso da onda R do ECG utilizado para a sincronização do bombeamento; o tipo de válvula solenóide e os componentes eletrônicos de maior resolução utilizados no segundo protótipo. O terceiro e atual protótipo passou a obter o sinal da onda R diretamente da saída de cardioversão do monitor de ECG e substituiu o ar comprimió e o vácuo hospitalares, além das válvulas solenóides, por uma bomba eletromagnética. Está em fase de resolução o problema de deflação tardia que ainda ocorre no sistema.The present paper presents the project and construction of a balloon-pump for aortic counterpulsation. Three experimental models were developed, the first two using hospital air and vacuum lines for inflation and deflation of the balloon catheter. These two inicial models diffères among themselves in the mechanism used to capture the light signal corresponding to the R wave of the ECG, which was used to sincronize the pumping. The solenoid valve and electronic components were of higher resolution in the second model. The third and present model recieves the R wave signal from the cardioversor adaptor of ECG monitor and the hospital vacuum and air lines along with the solenoid valve were substituted by an electromagnetic pump. The problems related to late deflation that have ocurred in the system are still in study. Emphasis is given on the importance of this research, which has incremented knowledge for the construction of other medical equipment, mainly in the area of respiratory care.

  4. Balloon aortic valvuloplasty in pregnancy with severe aortic stenosis and infective endocarditis

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    Vinotha

    2012-12-01

    Full Text Available Twenty seven year old lady, previously diagnosed to have aortic stenosis, presented to the obstetric outpatient department at 19 weeks of gestation with fever and breathlessness, NYHA class 4, for one week. Two D Echo revealed left ventricular hypertrophy, a severely stenosed, calcified bicuspid aortic valve, with vegetations on aortic and mitral valves and severe mitral regurgitation. Blood cultures grew nutrionally variant streptococci and she was treated with crystalline penicillin and gentamicin. She stabilised clinically by 21 weeks, by which time, the risk of termination of pregnancy was comparable to continuing the pregnancy. She underwent balloon aortic valvuloplasty. Post balloon aortic valvuloplasty, she was stable. At 34+2 weeks, she underwent emergency LSCS, the indication being intrauterine growth restriction with fetal compromise and breech presentation. She delivered a baby girl, 1.6 kg, Apgar 9 & 10. Our case report highlights the fact that a timely, balloon aortic valvuloplasty can be life saving for patients with pregnancy complicated by severe aortic stenosis and infective endocarditis. [Int J Reprod Contracept Obstet Gynecol 2012; 1(1.000: 69-71

  5. Anticoagulation therapy in intra-aortic balloon counterpulsation: Does IABP really need anti-coagulation ?

    Institute of Scientific and Technical Information of China (English)

    蒋晨阳; 赵莉莉; 王建安; 单江; MOHAMMODBalgaith

    2003-01-01

    Objective: To investigate if intra-aortic balloon pump(IABP) is contraindicated without anticoag-ulation therapy. Methods: Some 153 IABP patients in the King Abdulaziz Cardiac Center(KSA) were random-ly assigned into two groups. Anticoagulation group( Group A) consisted of 71 patients who were given heparin intravenously with target aPTT 50 - 70 seconds. Non-anticoagulation group( Group B) consisted of 82 patients without intravenous heparin during balloon pumping. Hematological parameters including platelet count, D-dimer, Plasminogen activator inhibitor-1 (PAI-1) and fibrinogen degradation products(FDP) were checked respectively at the point of baseline, 24 hours, 48 hours and 24 hours post IABP counterpulsation. Clot deposits on balloon surface, vascular complications from IABP including bleeding and limb ischemia were recorded.Results: Platelet count and PAI-1 level decreased at 24 hours and 48 hours in both groups ( P 0.05) . Three patients in Group A and 2 patients in Group B developed minor limb ischemia( P > 0.05). No major limb ischemia in either group. Two patients in Group A suffered major bleeding and required blood transfusion or surgical intervention, whereas no patient had major bleeding in Group B. Eight patients had minor bleeding in Group A, but only 2 patients in Group B ( P <0.05). No clot deposit developed on IABP surface in either group. Conclusion: IABP is safe without routine anticoagulation therapy. Selecting appropriate artery approach and early detection intervention are key methods for preventing complications.

  6. Anticoagulation therapy in intra-aortic balloon counterpulsation:Does IABP really need anti-coagulation?

    Institute of Scientific and Technical Information of China (English)

    JIANG Chen-yang(蒋晨阳); ZHAO Li-li(赵莉莉); WANG Jian-an(王建安); SAN Jiang(单江); MOHAMMOD Balgaith

    2003-01-01

    Objective: To investigate if intra-aortic balloon pump(IABP) is contraindicated without anticoagulation therapy. Methods: Some 153 IABP patients in the King Abdulaziz Cardiac Center(KSA) were randomly assigned into two groups. Anticoagulation group(Group A) consisted of 71 patients who were given heparin intravenously with target aPTT 50-70 seconds. Non-anticoagulation group(Group B) consisted of 82 patients without intravenous heparin during balloon pumping. Hematological parameters including platelet count, D-dimer, Plasminogen activator inhibitor-1(PAI-1) and fibrinogen degradation products(FDP) were checked respectively at the point of baseline, 24 hours, 48 hours and 24 hours post IABP counterpulsation. Clot deposits on balloon surface, vascular complications from IABP including bleeding and limb ischemia were recorded. Results: Platelet count and PAI-1 level decreased at 24 hours and 48 hours in both groups (P0.05). Three patients in Group A and 2 patients in Group B developed minor limb ischemia(P>0.05). No major limb ischemia in either group. Two patients in Group A suffered major bleeding and required blood transfusion or surgical intervention, whereas no patient had major bleeding in Group B. Eight patients had minor bleeding in Group A, but only 2 patients in Group B(P<0.05). No clot deposit developed on IABP surface in either group. Conclusion: IABP is safe without routine anticoagulation therapy. Selecting appropriate artery approach and early detection intervention are key methods for preventing complications.

  7. Aortic annulus eccentricity before and after transcatheter aortic valve implantation: Comparison of balloon-expandable and self-expanding prostheses

    Energy Technology Data Exchange (ETDEWEB)

    Schuhbaeck, Annika, E-mail: annika.schuhbaeck@uk-erlangen.de [Department of Cardiology, University of Erlangen, Erlangen (Germany); Weingartner, Christina [Department of Cardiology, University of Gießen, Giessen (Germany); Arnold, Martin; Schmid, Jasmin; Pflederer, Tobias; Marwan, Mohamed [Department of Cardiology, University of Erlangen, Erlangen (Germany); Rixe, Johannes; Nef, Holger [Department of Cardiology, University of Gießen, Giessen (Germany); Schneider, Christian [Department of Radiology, University of Gießen, Giessen (Germany); Lell, Michael; Uder, Michael [Department of Radiology, University of Erlangen, Erlangen (Germany); Ensminger, Stephan [Department of Thoracic and Cardiovascular Surgery, Heart and Diabetes Center NRW, Ruhr-University Bochum, Bad Oeynhausen (Germany); Feyrer, Richard; Weyand, Michael [Department of Cardiothoracic Surgery, University of Erlangen, Erlangen (Germany); Achenbach, Stephan [Department of Cardiology, University of Erlangen, Erlangen (Germany)

    2015-07-15

    Highlights: • Post-implant geometry of catheter-based aortic valve prostheses is influenced by aortic valve calcification. • Balloon-expandable prostheses are more circular as compared to self-expanding prostheses. • The impact of post-implant geometry on valve function needs to be investigated. - Abstract: Introduction: The geometry of the aortic annulus and implanted transcatheter aortic valve prosthesis might influence valve function. We investigated the influence of valve type and aortic valve calcification on post-implant geometry of catheter-based aortic valve prostheses. Methods: Eighty consecutive patients with severe aortic valve stenosis (mean age 82 ± 6 years) underwent computed tomography before and after TAVI. Aortic annulus diameters were determined. Influence of prosthesis type and degree of aortic valve calcification on post-implant eccentricity were analysed. Results: Aortic annulus eccentricity was reduced in patients after TAVI (0.21 ± 0.06 vs. 0.08 ± 0.06, p < 0.0001). Post-TAVI eccentricity was significantly lower in 65 patients following implantation of a balloon-expandable prosthesis as compared to 15 patients who received a self-expanding prosthesis (0.06 ± 0.05 vs. 0.15 ± 0.07, p < 0.0001), even though the extent of aortic valve calcification was not different. After TAVI, patients with a higher calcium amount retained a significantly higher eccentricity compared to patients with lower amounts of calcium. Conclusions: Patients undergoing TAVI with a balloon-expandable prosthesis show a more circular shape of the implanted prosthesis as compared to patients with a self-expanding prosthesis. Eccentricity of the deployed prosthesis is affected by the extent of aortic valve calcification.

  8. Aortic annulus eccentricity before and after transcatheter aortic valve implantation: Comparison of balloon-expandable and self-expanding prostheses

    International Nuclear Information System (INIS)

    Highlights: • Post-implant geometry of catheter-based aortic valve prostheses is influenced by aortic valve calcification. • Balloon-expandable prostheses are more circular as compared to self-expanding prostheses. • The impact of post-implant geometry on valve function needs to be investigated. - Abstract: Introduction: The geometry of the aortic annulus and implanted transcatheter aortic valve prosthesis might influence valve function. We investigated the influence of valve type and aortic valve calcification on post-implant geometry of catheter-based aortic valve prostheses. Methods: Eighty consecutive patients with severe aortic valve stenosis (mean age 82 ± 6 years) underwent computed tomography before and after TAVI. Aortic annulus diameters were determined. Influence of prosthesis type and degree of aortic valve calcification on post-implant eccentricity were analysed. Results: Aortic annulus eccentricity was reduced in patients after TAVI (0.21 ± 0.06 vs. 0.08 ± 0.06, p < 0.0001). Post-TAVI eccentricity was significantly lower in 65 patients following implantation of a balloon-expandable prosthesis as compared to 15 patients who received a self-expanding prosthesis (0.06 ± 0.05 vs. 0.15 ± 0.07, p < 0.0001), even though the extent of aortic valve calcification was not different. After TAVI, patients with a higher calcium amount retained a significantly higher eccentricity compared to patients with lower amounts of calcium. Conclusions: Patients undergoing TAVI with a balloon-expandable prosthesis show a more circular shape of the implanted prosthesis as compared to patients with a self-expanding prosthesis. Eccentricity of the deployed prosthesis is affected by the extent of aortic valve calcification

  9. Isothermal pumping analysis for high-altitude tethered balloons

    OpenAIRE

    Kuo, Kirsty A.; Hunt, Hugh E.M.

    2015-01-01

    High-altitude tethered balloons have potential applications in communications, surveillance, meteorological observations and climate engineering. To maintain balloon buoyancy, power fuel cells and perturb atmospheric conditions, fluids could be pumped from ground level to altitude using the tether as a hose. This paper examines the pumping requirements of such a delivery system. Cases considered include delivery of hydrogen, sulfur dioxide (SO2) and powders as fluid-based slurries. Isothermal...

  10. Effects of intra-aortic balloon pump on the blood flow to coronary grafts%主动脉内球囊反搏对冠状动脉旁路血管血流量的影响

    Institute of Scientific and Technical Information of China (English)

    苏丕雄; 刘文超; 高杰; 刘岩; 张希涛; 颜钧; 顾松

    2009-01-01

    目的 探讨主动脉内球囊反搏(IABP)应用前、后冠状动脉旁路移植术(cABG)各心动周期血流量变化特点,为临床合理应用IABP增加CABG术后旁路血管血流及心肌灌注提供理论基础.方法 2006年9月至2008年3月,302例CABG中22例术前或术中置入IABP,置人者均有明显应用IABP指征,共做旁路血管52支,其中动脉旁路血管24支,静脉旁路血管28支.52支旁路血管均在鱼精蛋白中合肝素后应用瞬时血流测量技术(TTFM)记录IABP起搏前、后各心动周期即心脏收缩期、舒张期、全心动周期血流变化指标:血流波形、平均血流量(Vmean)、每分钟速度时间积分(VTI)、弹力指数(PI值),同时记录桡动脉收缩压、舒张压及心率.结果 52支旁路血管均通畅,与不用IABP相比舒张期平均血流量[(58.05±29.10)ml/min对(46.14±40.48)ml/min,P0.05]、每分钟速度时间积分[(42.77±22.25)ml对(39.65±20.03)ml,P>0.05]没有明显变化;PI值没有明显变化(2.78±1.37对3.21±2.82,P>0.05).IABP应用前后心率[(83±13)次/min对(86±11)次/min,P>0.05]、桡动脉收缩压[(91.12±11.73)mmHg(1 mm Hg=0.133 kPa)对(88.23±15.47)mmHg,P>0.05]、桡动脉舒张压[(56.33±9.25)mmHg对(52.81±10.11)mmHg,P>0.05]无明显变化.结论 IABP不能明显增加旁路血管总的血流量,但心动周期各时期血流分布有较大变化,IABP增加旁路血管血流量主要是心脏舒张期,而心脏收缩期旁路血管血流量有一定下降.%ObJective Intra-aortic balloon pump(IABP) improves postoperative cardiac function substantially and reduces mor-rarity in the patients undergoing coronary artery bypass grafting(CABG) surgery by decreasing the postload of the heart and increasing the blood flow to the coronary artery. However, the effects of IABP on the blood flow to the coronary artery bypass grafts during differ-ent periods of the cardiac cycle, including systolic, diastolic and pan-cardiac cycle, remains unclear. Assess the changes in

  11. Latex Micro-balloon Pumping in Centrifugal Microfluidic Platforms

    OpenAIRE

    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...

  12. Implante transapical de endoprótese valvada balão-expansível em posição aórtica sem circulação extracorpórea Off-pump transapical balloon-expandable aortic valve endoprosthesis implantation

    Directory of Open Access Journals (Sweden)

    Diego Felipe Gaia

    2009-06-01

    ão.OBJECTIVE: The aortic valve replacement is a routine procedure, and involves replacement of the native valve/prosthesis. In most of the patients who undergo such procedure the risk is acceptable, but in some cases, such risk can justify contraindication. The minimally invasive transcatheter aortic valve implantation without cardiopulmonary bypass (CPB has been shown to be viable, with lower morbidity and mortality. The aim of this study was to develop a catheter-mounted aortic bioprosthesis for implantation without CPB. METHODS: After developing in animals, three patients with high EuroSCORE underwent implantation. Case 1: patients with bioprosthesis dysfunction; Case 2: severe aortic stenosis; Case 3: dysfunction of aortic bioprosthesis. After minithoracotomy and under echocardiographic and fluoroscopic control, a balloon catheter was placed on aortic position and inflated. After, a second balloon with valved endoprosthesis was positioned and released under high ventricular rate. Echocardiographic and angiographic controls were performed and the patients were referred to ICU. RESULTS: In the first case, implantation without CPB was possible with appropriate results. The patient evolved with improvement of ventricular function. After, this patient developed bronchopneumonia, tracheoesophageal fistula and died due to mediastinitis. Autopsy confirmed proper valve positioning and leaflets preservation. The second case showed the device migration after inflation of the balloon, with the need for urgent median sternotomy, CPB and conventional valve replacement. This patient evolved well and was discharged from the ICU on the 14th postoperative day without complications. This patient developed respiratory infection, septic shock and died on the 60th postoperative day. The patient from the third case underwent successful implantation. CONCLUSION: The off-pump transapical implantation of catheter-mounted bioprosthesis was shown to be a feasible procedure. Technical details and learning

  13. Assessment of the "long sheath" technique for percutaneous aortic balloon valvuloplasty.

    Science.gov (United States)

    Plante, S; Beatt, K J; van den Brand, M; Di Mario, C; Meier, B; Serruys, P W

    1990-02-01

    A 100 cm-long 16.5 F valvuloplasty catheter introducer was assessed as an adjunct for percutaneous transluminal aortic valvuloplasty (PTAV) via the femoral artery in 31 patients with severe aortic stenosis. Observed improvements in peak systolic gradient (81.6 +/- 29.9 mm Hg vs. 35.5 +/- 16.0 mm Hg, P less than 0.000001) and aortic valve area (0.6 +/- 0.4 cm2 vs. 1.0 +/- 0.6 cm2, P less than 0.00001) were similar to those achieved in a control group (C) of 17 patients in which no femoral sheath was used. However, a shorter procedure duration (211 +/- 81 min vs. 117 +/- 30 min, P less than 0.001) and a reduced rate of vascular complications at the femoral puncture site (41% vs. 6.5%) were observed in patients in whom the long sheath (LS) technique was used. The frequency of other PTAV-related complications was comparable (C = 35%, LS = 29%, P = n.s.). Other technical advantages of this device are: 1) prevention of looping and bending of the balloon catheter in tortuous vessels and easy positioning of the balloon across the aortic orifice provided by the LS trackability, 2) stabilisation of the balloon during inflation, 3) monitoring of supravalvular aortic pressure provided by the side-arm of the LS and reliable measurement of systolic gradient, and 4) the ability to perform aortograms without the need of another catheter in the ascending aorta. Thus, in our experience, the long sheath technique is a valuable adjunct for PTAV. PMID:2306775

  14. Newly Shaped Intra-Aortic Balloons Improve the Performance of Counterpulsation at the Semirecumbent Position: An In Vitro Study.

    Science.gov (United States)

    Kolyva, Christina; Pepper, John R; Khir, Ashraf W

    2016-08-01

    The major hemodynamic benefits of intra-aortic balloon pump (IABP) counterpulsation are augmentation in diastolic aortic pressure (Paug ) during inflation, and decrease in end-diastolic aortic pressure (ΔedP) during deflation. When the patient is nursed in the semirecumbent position these benefits are diminished. Attempts to change the shape of the IAB in order to limit or prevent this deterioration have been scarce. The aim of the present study was to investigate the hemodynamic performance of six new IAB shapes, and compare it to that of a traditional cylindrical IAB. A mock circulation system, featuring an artificial left ventricle and an aortic model with 11 branches and physiological resistance and compliance, was used to test one cylindrical and six newly shaped IABs at angles 0, 10, 20, 30, and 40°. Pressure was measured continuously at the aortic root during 1:1 and 1:4 IABP support. Shape 2 was found to consistently achieve, in terms of absolute magnitude, larger ΔedP at angles than the cylindrical IAB. Although ΔedP was gradually diminished with angle, it did so to a lesser degree than the cylindrical IAB; this diminishment was only 53% (with frequency 1:1) and 40% (with frequency 1:4) of that of the cylindrical IAB, when angle increased from 0 to 40°. During inflation Shape 1 displayed a more stable behavior with increasing angle compared to the cylindrical IAB; with an increase in angle from 0 to 40°, diastolic aortic pressure augmentation dropped only by 45% (with frequency 1:1) and by 33% (with frequency 1:4) of the drop reached with the cylindrical IAB. After compensating for differences in nominal IAB volume, Shape 1 generally achieved higher Paug over most angles. Newly shaped IABs could allow for IABP therapy to become more efficient for patients nursed at the semirecumbent position. The findings promote the idea of personalized rather than generalized patient therapy for the achievement of higher IABP therapeutic efficiency, with a choice

  15. Newly Shaped Intra‐Aortic Balloons Improve the Performance of Counterpulsation at the Semirecumbent Position: An In Vitro Study

    Science.gov (United States)

    Kolyva, Christina; Pepper, John R.

    2016-01-01

    Abstract The major hemodynamic benefits of intra‐aortic balloon pump (IABP) counterpulsation are augmentation in diastolic aortic pressure (P aug) during inflation, and decrease in end‐diastolic aortic pressure (ΔedP) during deflation. When the patient is nursed in the semirecumbent position these benefits are diminished. Attempts to change the shape of the IAB in order to limit or prevent this deterioration have been scarce. The aim of the present study was to investigate the hemodynamic performance of six new IAB shapes, and compare it to that of a traditional cylindrical IAB. A mock circulation system, featuring an artificial left ventricle and an aortic model with 11 branches and physiological resistance and compliance, was used to test one cylindrical and six newly shaped IABs at angles 0, 10, 20, 30, and 40°. Pressure was measured continuously at the aortic root during 1:1 and 1:4 IABP support. Shape 2 was found to consistently achieve, in terms of absolute magnitude, larger ΔedP at angles than the cylindrical IAB. Although ΔedP was gradually diminished with angle, it did so to a lesser degree than the cylindrical IAB; this diminishment was only 53% (with frequency 1:1) and 40% (with frequency 1:4) of that of the cylindrical IAB, when angle increased from 0 to 40°. During inflation Shape 1 displayed a more stable behavior with increasing angle compared to the cylindrical IAB; with an increase in angle from 0 to 40°, diastolic aortic pressure augmentation dropped only by 45% (with frequency 1:1) and by 33% (with frequency 1:4) of the drop reached with the cylindrical IAB. After compensating for differences in nominal IAB volume, Shape 1 generally achieved higher P aug over most angles. Newly shaped IABs could allow for IABP therapy to become more efficient for patients nursed at the semirecumbent position. The findings promote the idea of personalized rather than generalized patient therapy for the achievement of higher IABP therapeutic efficiency

  16. Relation of Aortic Valve Morphologic Characteristics to Aortic Valve Insufficiency and Residual Stenosis in Children With Congenital Aortic Stenosis Undergoing Balloon Valvuloplasty.

    Science.gov (United States)

    Petit, Christopher J; Gao, Kevin; Goldstein, Bryan H; Lang, Sean M; Gillespie, Scott E; Kim, Sung-In H; Sachdeva, Ritu

    2016-03-15

    Aortic valve morphology has been invoked as intrinsic to outcomes of balloon aortic valvuloplasty (BAV) for congenital aortic valve stenosis. We sought to use aortic valve morphologic features to discriminate between valves that respond favorably or unfavorably to BAV, using aortic insufficiency (AI) as the primary outcome. All patients who underwent BAV at 2 large-volume pediatric centers from 2007 to 2014 were reviewed. Morphologic features assessed on pre-BAV echo included valve pattern (unicuspid, functional bicuspid, and true bicuspid), leaflet fusion length, leaflet excursion angle, and aortic valve opening area and on post-BAV echo included leaflet versus commissural tear. Primary end point was increase in AI (AI+) of ≥2°. Eighty-nine patients (median age 0.2 years) were included in the study (39 unicuspid, 41 functional bicuspid, and 9 true bicuspid valves). Unicuspid valves had a lower opening area (p valves. Valve gradient pre-BAV and post-BAV were not different among valve patterns. Of the 16 patients (18%) with AI+, 14 had leaflet tears (odds ratio 13.9, 3.8 to 50). True bicuspid valves had the highest rate (33%) of AI+. On multivariate analysis, leaflet tears were associated with AI+, with larger opening area pre-BAV and lower fusion length pre-BAV. AI+ was associated with larger pre-BAV opening area. Gradient relief was associated with reduced angle of excursion. Valve morphology influences outcomes after BAV. Valves with lesser fusion and larger valve openings have higher rates of leaflet tears which in turn are associated with AI. PMID:26805657

  17. Meta-Analysis of the Effectiveness and Safety of Transcatheter Aortic Valve Implantation Without Balloon Predilation.

    Science.gov (United States)

    Liao, Yan-Biao; Meng, Yang; Zhao, Zhen-Gang; Zuo, Zhi-Liang; Li, Yi-Jian; Xiong, Tian-Yuan; Cao, Jia-Yu; Xu, Yuan-Ning; Feng, Yuan; Chen, Mao

    2016-05-15

    Evidence regarding the safety and feasibility of transcatheter aortic valve implantation without balloon predilation (BP) is scarce. A literature search of PubMed, EMBASE, CENTRAL, and major conference proceedings was performed from January 2002 to July 2015. There were 18 studies incorporating 2,443 patients included in the present study. No differences were observed in the baseline characteristics between patients without BP (no-BP) and with BP. Compared with BP, no-BP had a shorter procedure time (no-BP vs BP, 124.2 vs 138.8 minutes, p = 0.008), used less-contrast medium (no-BP vs BP, 126.3 vs 156.3 ml, p = 0.0005) and had a higher success rate (odds ratio [OR] 2.24, 95% CI 1.40 to -3.58). In addition, no-BP was associated with lower incidences of permanent pacemaker implantation (OR 0.45, 95% CI 0.3 to 0.67), grade 2 or greater paravalvular leakage (OR 0.55, 95% CI 0.37 to 0.83), and stroke (OR 0.57, 95% CI 0.32 to 1.0). Furthermore, no-BP was associated with a 0.6-fold decreased risk for 30-day all-cause mortality (OR 0.60, 95% CI 0.39 to 0.92). However, the difference in the risk for permanent pacemaker implantation, grade 2, or higher aortic regurgitation, stroke was noted to be significant only in the subgroup of the CoreValve-dominating studies. In conclusion, no-BP before transcatheter aortic valve implantation was not only safe and feasible but was also associated with fewer complications and short-term mortality in selected patients especially using self-expandable valve. PMID:27026641

  18. Intraluminal Projection of Descending Thoracic Aorta and Intraaortic Balloon Pump Catheter Examined by Transesophageal Echocardiography in Patients Undergoing Coronary Artery Bypass Surgery

    OpenAIRE

    Orihashi, Kazumasa; Oka, Yasu

    1991-01-01

    The thoracic descending aorta (DTA) was examined in 57 patients undergoing coronary artery bypass grafting (41 men and 16 women: 63.0 ± 10.6 years old) using two-dimensional transesophageal echocardiography. An intraaortic balloon pump (IABP) was instituted in ten patients. A short-axis view of DTA was examined for intraluminal projection from the diaphragm level to the aortic arch level. In a frozen-frame image, the area and the height of the projection at each clockwise direction was measur...

  19. SU-C-18C-02: Specifcation of X-Ray Projection Angles Which Are Aligned with the Aortic Valve Plane From a Planar Image of a Valvuloplasty Balloon Inflated Across the Aortic Valve

    International Nuclear Information System (INIS)

    Purpose: Transcatheter aortic valve replacement (TAVR) procedures provide a method to implant a prosthetic aortic valve via a minimallyinvasive, catheter-based procedure. TAVR procedures require use of interventional fluoroscopy c-arm projection angles which are aligned with the aortic valve plane to minimize prosthetic valve positioning error due to x-ray imaging parallax. The purpose of this work is to calculate the continuous range of interventional fluoroscopy c-arm projection angles which are aligned with the aortic valve plane from a single planar image of a valvuloplasty balloon inflated across the aortic valve. Methods: Computational methods to measure the 3D angular orientation of the aortic valve were developed. Required inputs include a planar x-ray image of a known valvuloplasty balloon inflated across the aortic valve and specifications of x-ray imaging geometry from the DICOM header of the image. A-priori knowledge of the species-specific typical range of aortic orientation is required to specify the sign of the angle of the long axis of the balloon with respect to the x-ray beam. The methods were validated ex-vivo and in a live pig. Results: Ex-vivo experiments demonstrated that the angular orientation of a stationary inflated valvuloplasty balloon can be measured with precision less than 1 degree. In-vivo pig experiments demonstrated that cardiac motion contributed to measurement variability, with precision less than 3 degrees. Error in specification of x-ray geometry directly influences measurement accuracy. Conclusion: This work demonstrates that the 3D angular orientation of the aortic valve can be calculated precisely from a planar image of a valvuloplasty balloon inflated across the aortic valve and known x-ray geometry. This method could be used to determine appropriate c-arm angular projections during TAVR procedures to minimize x-ray imaging parallax and thereby minimize prosthetic valve positioning errors

  20. SU-C-18C-02: Specifcation of X-Ray Projection Angles Which Are Aligned with the Aortic Valve Plane From a Planar Image of a Valvuloplasty Balloon Inflated Across the Aortic Valve

    Energy Technology Data Exchange (ETDEWEB)

    Fetterly, K; Mathew, V [Mayo Clinic, Rochester, MN (United States)

    2014-06-01

    Purpose: Transcatheter aortic valve replacement (TAVR) procedures provide a method to implant a prosthetic aortic valve via a minimallyinvasive, catheter-based procedure. TAVR procedures require use of interventional fluoroscopy c-arm projection angles which are aligned with the aortic valve plane to minimize prosthetic valve positioning error due to x-ray imaging parallax. The purpose of this work is to calculate the continuous range of interventional fluoroscopy c-arm projection angles which are aligned with the aortic valve plane from a single planar image of a valvuloplasty balloon inflated across the aortic valve. Methods: Computational methods to measure the 3D angular orientation of the aortic valve were developed. Required inputs include a planar x-ray image of a known valvuloplasty balloon inflated across the aortic valve and specifications of x-ray imaging geometry from the DICOM header of the image. A-priori knowledge of the species-specific typical range of aortic orientation is required to specify the sign of the angle of the long axis of the balloon with respect to the x-ray beam. The methods were validated ex-vivo and in a live pig. Results: Ex-vivo experiments demonstrated that the angular orientation of a stationary inflated valvuloplasty balloon can be measured with precision less than 1 degree. In-vivo pig experiments demonstrated that cardiac motion contributed to measurement variability, with precision less than 3 degrees. Error in specification of x-ray geometry directly influences measurement accuracy. Conclusion: This work demonstrates that the 3D angular orientation of the aortic valve can be calculated precisely from a planar image of a valvuloplasty balloon inflated across the aortic valve and known x-ray geometry. This method could be used to determine appropriate c-arm angular projections during TAVR procedures to minimize x-ray imaging parallax and thereby minimize prosthetic valve positioning errors.

  1. Caesarean section combined with temporary aortic balloon occlusion followed by uterine artery embolisation for the management of placenta accreta

    International Nuclear Information System (INIS)

    Aim: To determine the efficacy and safety of caesarean section combined with temporary aortic balloon occlusion followed by uterine artery embolisation (UAE) for the treatment of patients with placenta accreta. Materials and methods: This retrospective study involved 42 patients with placenta accreta. All patients underwent caesarean section combined with temporary aortic balloon occlusion followed by UAE through the right femoral approach. Results: All patients were confirmed to have placenta praevia and accreta, including five patients with placenta percreta, at the time of delivery. The technical success rate of the combined treatment was 97.6% (41/42). Forty-one patients underwent successful caesarean section with conservation of the uterus. Hysterectomy was required in one (3.1%) patient. The amount of blood loss and blood transfusion, and the operation time were was 586 ± 355 ml, 422 ± 83 ml and 65.5 ± 10.6 minutes, respectively. The mean postoperative hospital stay, occlusion time and fetal radiation dose were 5.5 ± 2.6 days, 22.4 ± 7.2 minutes and 4.2 ± 2.9 mGy, respectively. There were no significant changes before and 7 days after the endovascular procedure in creatinine levels (56.8 ± 13.8 μmol/l versus 63.4 ± 16.7 μmol/l, p = 0.09) or urea nitrogen (6.3 ± 2.5 μmol/l versus 7.4 ± 3.8 μmol/l, p = 0.17). There were no access-site complications after the endovascular procedure and no complications related to the intervention during follow-up. Conclusion: Temporary aortic balloon occlusion followed by UAE can effectively control postpartum haemorrhage during placental dissection, and reduce transfusion requirements, hysterectomy rate, and operation time in patients with placenta accreta. -- Highlights: •Aortic balloon occlusion can overcome the collateral flow from other arteries. •UAE can effectively manage secondary postpartum haemorrhage. •The aortic balloon can rapidly and easily insert. •The mean

  2. In-Graft Endovascular Stenting Repair for Supravalvular Stenosis From Aortic Rupture After Balloon-Expanding Transcatheter Aortic Valve Implantation.

    Science.gov (United States)

    Furukawa, Nobuyuki; Scholtz, Werner; Haas, Nikolaus; Ensminger, Stephan; Gummert, Jan; Börgermann, Jochen

    2015-01-01

    An 81-year-old man with high-grade aortic valve stenosis and status post-coronary artery bypass grafting and supracoronary replacement of the ascending aorta was referred for transcatheter aortic valve implantation. He was in New York Heart Association class III and had dyspnea. After appropriate screening, we implanted a 29-mm SAPIEN XT valve (Edwards Lifesciences, Irvine, CA USA) through a transapical approach because of severe peripheral arterial occlusive disease. Postinterventional aortography revealed correct positioning and function of the valve and free coronary ostia but contrast extravasation in the vicinity of the interposed vascular prosthesis, resulting in severe luminal narrowing. We chose to manage the stenosis with an endovascular stent. After stenting, extravascular compression was markedly reduced, and the pressure gradient disappeared. The patient was discharged home on the 20th postoperative day. Three months later, computed tomography depicted correct positioning of both grafts. The patient's general health is good, and he is now in New York Heart Association class II. This case illustrates a complication of transcatheter aortic valve implantation specific for patients with an ascending aortic graft. Although stenting may be a good solution, as depicted by this case, self-expanding transcatheter aortic valves should be preferred in patients with ascending aortic grafts to avoid the described complication. PMID:26355692

  3. Interventional treatment of common congenital heart diseases: the common view of Chinese medical experts. Part Four: Percutaneous balloon valvuloplasty for pulmonary and aortic valve stenosis

    International Nuclear Information System (INIS)

    Percutaneous balloon valvuloplasty has become the treatment of first choice for pulmonary valve stenosis. Congenital aortic valve stenosis can also be relieved by percutaneous balloon dilatation. Percutaneous valvuloplasty is indicated for patients with isolated pulmonary valve stenosis when the transvalvular peak systolic pressure gradient is over 40 mmHg and for patients with aortic valve stenosis when the pressure gradient exceeds 60 mmHg. A careful selection of patients, standardized procedure, individualized selection of the balloon type, size and length, and careful avoidance of any damage to chorda tendineae and to surrounding tissue are keys to achieving a successful procedure. Balloon valvuloplasty should be selectively performed in new-born and in infant since complications of the procedure are inversely related to age. (authors)

  4. The comparison a 16-year follow-up results of balloon angioplasty for aortic coarctation in children of different age groups: a single-center experience

    OpenAIRE

    Yakup Ergül; Kemal Nişli; Aygün Dindar; Rukiye Eker Ömeroğlu; Ümrah Aydoğan

    2011-01-01

    Objective: Pediatric patients with different age groups who underwent balloon angioplasty for aortic coarctation were evaluated for recoarctation, aneurysm, peripheral arterial injuries and concomitant diseases. Methods: From January 1994 to 2010, 80 patients with aortic coarctation (native/recoarctation) were evaluated, retrospectively. According to age at angioplasty, patients were divided into three groups: Group A (0-3 months, n=29, 25 male/4 female, average weight 4±1.2 kg), Group B (3-1...

  5. Controlled transient respiratory arrest along with rapid right ventricular pacing for improving balloon stability during balloon valvuloplasty in pediatric patients with congenital aortic stenosis - A retrospective case series analysis

    Directory of Open Access Journals (Sweden)

    Gupta Sampa

    2010-01-01

    Full Text Available Rapid right ventricular pacing is safe, effective, and established method to provide balloon stability during balloon aortic valvuloplasty (BAV. Controlled transient respiratory arrest at this point of time may further reduce left ventricular stroke volume, providing an additional benefit to maintain balloon stability. Two groups were studied. Among the 10 patients, five had rapid pacing alone (Group A, while the other five were provided with cessation of positive pressure breathing as well (Group B. The outcomes of BAV in the two groups of patients were studied. One patient in Group A had failed balloon dilatation even after the fourth attempt, while in Group B there were no failures. The peak systolic gradient reduction was higher in Group B (70.05% in comparison to 52.16% of group A. In Group A, five subjects developed aortic regurgitation (grade 2 in four and grade 3 in one, while no grade 3 aortic regurgitation developed in any patient in Group B. Controlled transient respiratory arrest along with rapid ventricular pacing may be effective in maintaining balloon stability and improve the outcome of BAV.

  6. Controlled transient respiratory arrest along with rapid right ventricular pacing for improving balloon stability during balloon valvuloplasty in pediatric patients with congenital aortic stenosis--a retrospective case series analysis.

    Science.gov (United States)

    Gupta, Sampa Dutta; Das, Soumi; Ghose, Tapas; Sarkar, Achyut; Goswami, Anupam; Kundu, Sudeshna

    2010-01-01

    Rapid right ventricular pacing is safe, effective, and established method to provide balloon stability during balloon aortic valvuloplasty (BAV). Controlled transient respiratory arrest at this point of time may further reduce left ventricular stroke volume, providing an additional benefit to maintain balloon stability. Two groups were studied. Among the 10 patients, five had rapid pacing alone (Group A), while the other five were provided with cessation of positive pressure breathing as well (Group B). The outcomes of BAV in the two groups of patients were studied. One patient in Group A had failed balloon dilatation even after the fourth attempt, while in Group B there were no failures. The peak systolic gradient reduction was higher in Group B (70.05% in comparison to 52.16% of group A). In Group A, five subjects developed aortic regurgitation (grade 2 in four and grade 3 in one, while no grade 3 aortic regurgitation developed in any patient in Group B). Controlled transient respiratory arrest along with rapid ventricular pacing may be effective in maintaining balloon stability and improve the outcome of BAV. PMID:20826965

  7. Assessment of the "long sheath" technique for percutaneous aortic balloon valvuloplasty

    NARCIS (Netherlands)

    S. Plante (Sylvain); K.J. Beatt (Kevin); M.J.B.M. van den Brand (Marcel); C. di Mario (Carlo); B. Meier (Bernard); P.W.J.C. Serruys (Patrick)

    1990-01-01

    textabstractA 100 cm-long 16.5 F valvuloplasty catheter introducer was assessed as an adjunct for percutaneous transluminal aortic valvuloplasty (PTAV) via the femoral artery in 31 patients with severe aortic stenosis. Observed improvements in peak systolic gradient (81.6 +/- 29.9 mm Hg vs. 35.5 +/-

  8. A High Performance Pulsatile Pump for Aortic Flow Experiments in 3-Dimensional Models.

    Science.gov (United States)

    Chaudhury, Rafeed A; Atlasman, Victor; Pathangey, Girish; Pracht, Nicholas; Adrian, Ronald J; Frakes, David H

    2016-06-01

    Aortic pathologies such as coarctation, dissection, and aneurysm represent a particularly emergent class of cardiovascular diseases. Computational simulations of aortic flows are growing increasingly important as tools for gaining understanding of these pathologies, as well as for planning their surgical repair. In vitro experiments are required to validate the simulations against real world data, and the experiments require a pulsatile flow pump system that can provide physiologic flow conditions characteristic of the aorta. We designed a newly capable piston-based pulsatile flow pump system that can generate high volume flow rates (850 mL/s), replicate physiologic waveforms, and pump high viscosity fluids against large impedances. The system is also compatible with a broad range of fluid types, and is operable in magnetic resonance imaging environments. Performance of the system was validated using image processing-based analysis of piston motion as well as particle image velocimetry. The new system represents a more capable pumping solution for aortic flow experiments than other available designs, and can be manufactured at a relatively low cost. PMID:26983961

  9. Contrapulsação em operação cardíaca: análise retrospectiva da incidência de infecção Intra-aortic balloon pumping: incidense of complications related to its insertion

    Directory of Open Access Journals (Sweden)

    Luís Henrique Barbosa Borges

    1994-06-01

    Full Text Available Recentes avanços tecnológicos ampliaram o uso do balão intra-aórtico como medida de suporte na insuficiência cardíaca aguda. Apesar disto, têm sido descritas algumas complicações relacionadas à sua inserção, duração do uso e localização. O objetivo deste estudo foi investigar retrospectivamente a ocorrência de infecções em pacientes críticos que necessitaram do uso do balão intra-aórtico (BIA após operação cardíaca. Entre janeiro de 1990 e julho de 1992, foram revisados os prontuários de 97 pacientes que necessitaram de BIA no pós-operatório de operação cardíaca, sendo que apenas 55 apresentavam informações completas que permitiram sua inclusão na revisão. Foram obtidas informações a respeito de ocorrência de infecções, resultados de culturas, tipo e tempo de duração das operações, tempo de circulação extracorpórea, duração da cateterização intravascular e evolução clínica. Foram considerados os seguintes locais de infecção: pulmão, urina, corrente sangüínea, ferida operatória e local de inserção do BIA. A média de permanência do BIA foi de 3,9 ± 2,01 dias e os tempos médios de operação e de circulação extracorpórea foram 8h e 2,5h, respectivamente. Observamos uma alta incidência de infecções nestes pacientes, principalmente pneumonia (63,6%. A taxa de infecção no local de inserção do BIA foi de 7% e maior que a taxa geral de infecção da ferida operatória em nossa Instituição (3%. Apesar desta alta incidência de infecções não relacionar-se diretamente com a taxa de mortalidade, sugerimos rigorosa vigilância com relação à ocorrência de infecções e possíveis medidas profiláticas em relação a infecções pulmonaresThe technological advances of recent years have permitted a wide range of uses for intraaort balloon pumping (IABP to support acute cardiac failure in many clinical condition. In spite of this, some complications related to its insertion

  10. Intra-aortic balloon occlusion catheter for treating hemorrhagic shock after massive duodenal ulcer bleeding.

    Science.gov (United States)

    Shigesato, Shintaro; Shimizu, Tetsunosuke; Kittaka, Tadahiro; Akimoto, Hiroshi

    2015-03-01

    Clamping the descending aorta by emergency thoracotomy is a well-known effective procedure to stop bleeding from lesions under the diaphragm. We successfully treated a case of cardiopulmonary arrest resulting from a massive duodenal ulcer hemorrhage using an intraaortic balloon occlusion (IABO) catheter instead of the conventional technique. Our experience suggests that IABO catheters can be used to treat patients with hemorrhagic shock regardless of the presence of cardiopulmonary arrest. This can be a life-saving procedure, which prevents ischemic brain injury. This article describes the advantages of using IABO catheters and our experience with this case. PMID:25633531

  11. Laceration of anterior mitral leaflet postpercutaneous balloon mitral valvuloplasty for rheumatic mitral stenosis

    OpenAIRE

    Jadoon, Mehmood; Roberts, M. J.; Dixon, L.; Jones, Mark

    2012-01-01

    A 37-year-old Caucasian female with known rheumatic mitral stenosis was admitted for Balloon mitral valvuloplasty which was complicated with a laceration of anterior mitral leaflet (A2 scallop) resulting in severe mitral regurgitation. Intra-aortic balloon pump (IABP) was instituted and the patient was referred for emergency mitral surgery. During surgery anterior mitral leaflet was excised. Most of the posterior leaflet was preserved. Mitral valve was replaced with St Jude mitral mechanical ...

  12. Initial hydrodynamic study on a new intraaortic axial flow pump: Dynamic aortic valve

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Rotary blood pumps have been researched as implantableventricular assist devices for years. To further reduce the complex of implanted axial pumps, the authors proposed a new concept of intraaortic axial pump, termed previously as "dynamic aortic valve (DAV)". Instead of being driven by an intraaortic micro-electric motor, it was powered by a magnetic field from outside of body. To ensure the perfusion of coronary artery, the axial flow pump is to be implanted in the position of aortic valve. It could serve as either a blood pump or a mechanical valve depending on the power input. This research tested the feasibility of the new concept in model study. A column, made from permanent magnet, is jointed to an impeller in a concentric way to form a "rotor-impeller". Supported by a hanging shaft cantilevered in the center of a rigid cage, the rotor-impeller can be turned by the magnetic field in the surrounding space. In the present prototype, the rotor is 8 mm in diameter and 15 mm in length, the impeller has 3 vanes with an outer diameter of 18 mm. The supporting cage is 22 mm in outer diameter and 20 mm in length. When tested, the DAV prototype is inserted into the tube of a mock circuit. The alternative magnetic field is produced by a rotating magnet placed side by side with the rotor-impeller at a distance of 30 mm. Once the alternative magnetic field is presented in the surrounding space, the DAV starts to turn, leading to a pressure difference and liquid flow in the tube. The flow rate or pressure difference is proportioned to rotary speed. At the maximal output of hydraulic power, the flow rate reached 5 L/min against an afterload of 100 mmHg. The maximal pressure difference generated by DAV at a rotation rate of 12600 r/min was 147 mmHg. The preliminary results demonstrated the feasibility of "DAV", further research on this concept is justifiable.

  13. PUCA pump and IABP comparison : analysis of hemodynamic and energetic effects using a digital computer model of the circulation

    NARCIS (Netherlands)

    Fresiello, Libera; Gu, Y. John; Ferrari, Gianfranco; Di Molfetta, Arianna; Rakhorst, Gerhard

    2011-01-01

    The pulsatile catheter pump (PUCA pump) is a left ventricular assist device that provides additional flow to the left ventricle. It is usually run in order to ensure a counterpulsation effect, as in the case of the intra-aortic balloon pump (IABP). Because of this similarity, a comparison between th

  14. DISPOSABLE NON-MECHANICAL ELASTOMERIC BALLOON PUMP FOR CONTINUOUS EPIDURAL INFUSION: AN EFFECTIVE AND RELIABLE MEANS FOR POSTOPERATIVE ANALGESIA

    Directory of Open Access Journals (Sweden)

    Dilip Kumar

    2016-01-01

    Full Text Available Postoperative pain an unpleasant sensory and emotional experience is one of the most challenging and gratifying domains to treat. Aim is here to assess effectiveness of postoperative pain relief, side effects and complications while using non-mechanical disposable elastomeric pump as continuous epidural infusion. PATIENTS AND METHODS The present study has been carried out on thirty patients in postoperative wards. At the end of operation the Elastomeric pump containing 125ml of bupivacaine (0.125% was connected with the epidural catheter Pain was assessed by VAS scoring system ranging from 0 to 10. Haemodynamic parameters, quality of analgesia, degree of motor block, and adverse effect encountered were recorded at two hours interval for 24 hours at the end of two hours of subarachnoid block when operation is over. RESULTS AND OBSERVATIONS None of our patients had shown any clinically significant changes in their cardiorespiratory indices in the postoperative period. All the patients at 0 hr. were having VAS score of 0 and till 22 hours enjoyed good pain relief, i.e. VAS of 3-4. Infusion is not always steady as set by the manufacturer. There is no motor blockade after 16 hours (Bromage-0. Insignificant number of patients experienced nausea or vomiting and backache. CONCLUSIONS Elastomeric balloon pumps is a reliable device to deliver LA agents steadily and safely with 0.125% bupivacaine as continuous epidural.

  15. Percutaneous Balloon Angioplasty for Severe Native Aortic Coarctation in Young Infants Less Than 6 Months: Medium- to Long-term Follow-up

    Science.gov (United States)

    He, Lan; Liu, Fang; Wu, Lin; Qi, Chun-Hua; Zhang, Li-Feng; Huang, Guo-Ying

    2015-01-01

    Background: Although balloon angioplasty (BA) has been performed for more than 20 years, its use as a treatment for native coarctation of the aorta (CoA) during childhood, especially in young infants, remains controversial. This study aimed to assess the effects and potential role of percutaneous transcatheter BA for native CoA as an alternative therapy to surgical repair in young infants. Methods: The 37 patients aged from 6 days to 6 months with severe CoA in congestive heart failure or circulatory shock were admitted for BA. Patient's weight ranged from 2.4 to 6.1 kg. All 37 patients were experiencing cardiac dysfunction, and eight patients were in cardiac shock with severe metabolic acidosis. Eleven patients had an isolated CoA, whereas the others had a CoA associated with other cardiac malformations. Cardiac catheterization and aortic angiography were performed under general anesthesia with intubation. Transfemoral arterial approaches were used for the BA. The size of the balloon ranged from 3 mm × 20 mm to 8 mm × 20 mm, and a coronary artery balloon catheter was preferred over a regular peripheral vascular balloon catheter. Results: The femoral artery was successfully punctured in all but one patient, with that patient undergoing a carotid artery puncture. The systolic peak pressure gradient (PG) across the coarctation was 41.0 ± 16.0 mmHg (range 13–76 mmHg). The mean diameter of the narrowest coarctation site was 1.7 ± 0.6 mm (range 0.5–2.8 mm). All patients had successful dilation; the PG significantly decreased to 13.0 ± 11.0 mmHg (range 0–40 mmHg), and the diameter of coarctation significantly improved to 3.8 ± 0.9 mm (range 2.5–5.3 mm). No intraoperative complications occurred for any patients. However, in one case that underwent a carotid artery puncture, a giant aneurysm formed at the puncture site and required surgical repair. The following observations were made during the follow-up period from 6-month to 7-year: (1) The PG across the

  16. Percutaneous Balloon Angioplasty for Severe Native Aortic Coarctation in Young Infants Less Than 6 Months: Medium-to Long-term Follow-up

    Institute of Scientific and Technical Information of China (English)

    Lan He; Fang Liu; Lin Wu; Chun-Hua Qi; Li-Feng Zhang; Guo-Ying Huang

    2015-01-01

    Background:Although balloon angioplasty (BA) has been performed for more than 20 years,its use as a treatment for native coarctation of the aorta (CoA) during childhood,especially in young infants,remains controversial.This study aimed to assess the effects and potential role of percutaneous transcatheter BA for native CoA as an alternative therapy to surgical repair in young infants.Methods:The 37 patients aged from 6 days to 6 months with severe CoA in congestive heart failure or circulatory shock were admitted for BA.Patient's weight ranged from 2.4 to 6.1 kg.All 37 patients were experiencing cardiac dysfunction,and eight patients were in cardiac shock with severe metabolic acidosis.Eleven patients had an isolated CoA,whereas the others had a CoA associated with other cardiac malformations.Cardiac catheterization and aortic angiography were performed under general anesthesia with intubation.Transfemoral arterial approaches were used for the BA.The size of the balloon ranged from 3 mm × 20 mm to 8 mm × 20 mm,and a coronary artery balloon catheter was preferred over a regular peripheral vascular balloon catheter.Results:The femoral artery was successfully punctured in all but one patient,with that patient undergoing a carotid artery puncture.The systolic peak pressure gradient (PG) across the coarctation was 41.0 ± 16.0 mmHg (range 13-76 mmHg).The mean diameter of the narrowest coarctation site was 1.7 ± 0.6 mm (range 0.5-2.8 mm).All patients had successful dilation;the PG significantly decreased to 13.0 ± 1 1.0 mmHg (range 0-40 mmHg),and the diameter of coarctation significantly improved to 3.8 ± 0.9 mm (range 2.5-5.3 mm).No intraoperative complications occurred for any patients.However,in one case that underwent a carotid artery puncture,a giant aneurysm formed at the puncture site and required surgical repair.The following observations were made during the follow-up period from 6-month to 7-year:(1) The PG across the coarctation measured by

  17. Emergency Abdominal Aortic Aneurysm Repair in a Patient with Failing Heart: Axillofemoral Bypass Using a Centrifugal Pump Combined with Levosimendan for Inotropic Support

    Directory of Open Access Journals (Sweden)

    Pavel Michalek

    2011-01-01

    Full Text Available We describe the case of an 83-year-old patient requiring repair of a large symptomatic abdominal aortic aneurysm (AAA. The patient was known to have coronary artery disease (CAD with symptoms and signs of significant myocardial dysfunction, left-heart failure, and severe aortic insufficiency. The procedure was performed with the help of both mechanical and pharmacological circulatory support. Distal perfusion was provided by an axillofemoral bypass with a centrifugal pump, with dobutamine and levosimendan administered as pharmacological inotropic support. The patient's hemodynamic status was monitored with continuous cardiac output monitoring and transesophageal echocardiography. No serious circulatory complications were recorded during the perioperative and postoperative periods. This paper suggests a potential novel approach to combined circulatory support in patients with heart failure, scheduled for open abdominal aortic aneurysm repair.

  18. EFFECTS OF OUABAIN AND DIGOXIN ON THE GENE EXPRESSION OF SODIUM PUMP α-SUBUNIT ISOFORM IN AORTIC SMOOTH MUSCLE OF RATS

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Objective To compare the effects of ouabain and digoxin on both the systolic blood pressure and sodium pump α-subunit isoforms gene expression in the aortic smooth muscle of rats. Methods Normal SpragueDawley rats were injected with ouabain (20μg·kg-1 ·d-1 ,i. p),digoxin (32 μg·kg-1 ·d-1,i. p)and normal saline once a day, respectively, and indirect systolic blood pressure was recorded once a week. Six weeks later,all the rats were killed and sodium pump α1-,α2-,and α3-subunit mRNA levels were detected in the aortic smooth muscle with reverse transcription polymerase chain reaction(RT-PCR) method. Results The systolic blood pressure of rats infused with ouabain increased significantly at the end of week 6 [132. 6± 9. 0 mmHg (1 mmHg = 0. 133 kPa)vs 115. 7±8.2mmHg, P <0. 01] ,while no difference of blood pressure was found between digoxin group and NS group (P>0.05).The expression of sodium pump α-subunit isoforms in aortic smooth muscle was regulated by either ouabain or digoxin:both ouabain and digoxin increased α1- and α3-subunit expression, α2-subunit decreased in digoxin group but unchanged in ouabain group. Conclusion These results suggest that both ouabain and digoxin could regulate sodium pump α-subunit isoform expression, which might be related to the physiological roles of endogenous ouabain and might be responsible for the difference between the pharmacological and toxicological effects of ouabain and digoxin,including their effects on blood pressure.

  19. DISPOSABLE NON-MECHANICAL ELASTOMERIC BALLOON PUMP FOR CONTINUOUS EPIDURAL INFUSION: AN EFFECTIVE AND RELIABLE MEANS FOR POSTOPERATIVE ANALGESIA

    OpenAIRE

    Dilip Kumar; Mrinal Kanti; Subhankar

    2016-01-01

    Postoperative pain an unpleasant sensory and emotional experience is one of the most challenging and gratifying domains to treat. Aim is here to assess effectiveness of postoperative pain relief, side effects and complications while using non-mechanical disposable elastomeric pump as continuous epidural infusion. PATIENTS AND METHODS The present study has been carried out on thirty patients in postoperative wards. At the end of operation the Elastomeric pump containin...

  20. Early outcomes of transcatheter aortic valve replacement in patients with severe aortic stenosis: single center experience

    OpenAIRE

    Bozkurt, Engin; KELEŞ, TELAT; Durmaz, Tahir; Akçay, Murat; Sari, Cenk; Ayhan, Hüseyin; Bayram, Nihal Akar; Aslan, Abdullah Nabi; Baştuğ, Serdal; Bilen, Emine

    2014-01-01

    Introduction Transcatheter aortic valve implantation is a promising alternative to high risk surgical aortic valve replacement. The procedure is mainly indicated in patients with severe symptomatic aortic stenosis who cannot undergo surgery or who are at very high surgical risk. Aim Description early results of our single-center experience with balloon expandable aortic valve implantation. Material and methods Between July 2011 and August 2012, we screened in total 75 consecutive patients wit...

  1. Aortic stenosis

    Science.gov (United States)

    ... stenosis; Valvular aortic stenosis; Congenital heart - aortic stenosis; Rheumatic fever - aortic stenosis Images Aortic stenosis Heart valves References Carabello BA. Valvular heart disease. In: Goldman L, Schafer AI, eds. Goldman's Cecil ...

  2. Wave intensity analysis of para-aortic counterpulsation.

    Science.gov (United States)

    Lu, Pong-Jeu; Yang, Chi-Fu Jeffrey; Wu, Meng-Yu; Hung, Chun-Hao; Chan, Ming-Yao; Hsu, Tzu-Cheng

    2012-04-01

    Wave intensity analysis (WIA) was used to delineate and maximize the efficacy of a newly developed para-aortic blood pump (PABP). The intra-aortic balloon pump (IABP) was employed as the comparison benchmark. Acute porcine experiments using eight pigs, randomly divided into IABP (n = 4) and PABP (n = 4) groups, were conducted to compare the characteristics of intra- and para-aortic counterpulsation. We measured pressure and velocity with probes installed in the left anterior descending coronary artery and aorta, during and without PABP assistance. Wave intensity for aortic and left coronary waves were derived from pressure and flow measurements with synchronization correction applied. To achieve maximized support efficacy, deflation timings ranging from 25 ms ahead of to 35 ms after the R-wave were tested. Similar to those associated with IABP counterpulsation, the PABP-generated backward-traveling waves predominantly drove aortic and coronary blood flows. However, in contrast with IABP counterpulsation, the nonocclusive nature of the PABP allowed systolic unloading to be delayed into early systole, which resulted in near elimination of coronary blood steal without diminution of systolic left ventricular ejection wave intensities. WIA can elucidate subtleties among different counterpulsatile support means with high sensitivity. Total accelerating wave intensity (TAWI), which was defined as the sum of the time integration of accelerated parts of the positive and negative wave intensities, was used to quantify counterpulsation efficacy. In general, the larger the TAWI gain, the better the counter-pulsatile support efficacy. However, when PABP deflation timings were delayed to after the R-wave, the TAWI was found to be inversely correlated with coronary perfusion. In this delayed deflation timing setting, greater wave cancellation occurred, which led to decreased TAWI but increased coronary perfusion attributed to blood regurgitation reduction. PMID:22227124

  3. Augmentation of abdominal organ perfusion during cardiopulmonary bypass with a novel intra-aortic pulsatile catheter pump

    NARCIS (Netherlands)

    Gu, YJ; De Kroon, T; Elstrodt, JM; van Oeveren, W; Boonstra, PW; Rakhorst, G

    2005-01-01

    Background: Current pulsatile pumps for cardiopulmonary bypass (CPB) are far from satisfactory because of the poor pulsatility. This study was undertaken to examine the efficiency of a novel pulsatile catheter pump on pulsatility and its effect on abdominal organ perfusion during CPB. Methods: Twelv

  4. Aortic insufficiency

    Science.gov (United States)

    ... Heart valve - aortic regurgitation; Valvular disease - aortic regurgitation; AI - aortic insufficiency ... BA. Valvular heart disease. In: Goldman L, Schafer AI, eds. Goldman's Cecil Medicine . 25th ed. Philadelphia, PA: ...

  5. Off-Pump Coronary Bypass Grafting Causing Stunned Myocardium

    Directory of Open Access Journals (Sweden)

    Feridoun Sabzi

    2015-10-01

    Full Text Available The term “stunned myocardium” refers to abnormalities in the myocardial function following reperfusion and is common in on-pump coronary artery bypass grafting (CABG and is exceedingly rare in off- pump CABG. A 53-year-old man presented with unstable angina due to the severe stenosis of the left anterior descending coronary artery (LAD and the obtuse marginal. Laboratory findings and Chest X-ray revealed nothing abnormal. The intraoperative course was uneventful. The patient left the operating room without any inotropic support. Six hours later, however, he developed low cardiac output .At exploration, cardiac tamponade was excluded and flowmetry showed that the graft had adequate function. Cardiac enzymes were normal. High-dose adrenalin and Dobutamine were administrated and an intra-aortic balloon pump was used. After hemodynamic stabilization, the patient left the Intensive Care Unit without an intra-aortic balloon pump and inotropic support. On the fifth postoperative day, coronary angiography showed patent grafts and correct anastomotic sites. On the seventh postoperative day, the akinetic lateral wall of the left ventricle changed to dyskinesia. Finally after hospital discharge on the thirtieth postoperative day, an echocardiogram showed normal left ventricular function without regional wall motion abnormalities

  6. Influence of cardiogenic shock with or without the use of intra-aortic balloon pump on mortality in patients with ST-segment elevation myocardial infarction

    Directory of Open Access Journals (Sweden)

    Jesper Khedri Jensen

    2015-03-01

    Conclusion: Patients with STEMI and cardiogenic shock had substantial short- and long-term mortality that may be improved with IABP implantation. More studies on use of IABP in such patients are warranted.

  7. Navigation Technology in Endovascular Aortic Repair

    OpenAIRE

    Manstad-Hulaas, Frode

    2013-01-01

    A number of diseases can affect the aorta, and endovascular (minimally invasive) techniques can be used to treat many of these conditions. During endovascular aortic repair, different instruments, such as catheters (plastic tubes), metal wires and balloons are visualized by X-rays. Intermittent aortic injections of contrast medium improve the depiction of the aorta; however, contrast medium may damage kidney function in some patients, radiation can be harmful and X-ray images are 2- dimension...

  8. Obesity and gastric balloon

    Directory of Open Access Journals (Sweden)

    Mohammed I Yasawy

    2014-01-01

    Full Text Available Background: The obesity epidemic, which is among the most common nutritional disorders, is rising rapidly worldwide. It leads to several health problems such as metabolic disorders, stroke, and even cancer. Efforts to control obesity with exercise and diet have a limited value in obese patients and different approaches to do this have been tried. In this paper, we share our experience with bioenteric intragastric balloon (BIB in treating obesity: Its safety, tolerability, and its efficacy in weight reduction. Materials and Methods: From January 2009 to September 2012, a total of 190 gastric balloons was inserted on patients at the endoscopy unit in King Fahd Hospital of the University, Al-Khobar. This is an evaluation of the first 100 patients. All the patients had a body mass index of over 30 kg/m 2 and were within the age range of 17-55 with a mean age of 32 years. After consent, preballoon investigation tests and anesthesia evaluation, BIB was inserted under monitored anesthesia care sedation in the endoscopy suite. The balloon was filled with 500-700 mls of stained saline. All patients′ were given an analgesic and antiemetic for a week and antisecretory proton pump inhibitor′s for 6 months. Diet and the importance of the exercise were part of the preballoon insertion phase and protocol. The balloon was removed after 6-12 months. Results: The weight loss response to BIB in the 100 patients are classified into four groups: In the uncooperative, noncompliant patients - the maximum weight loss was 7 kg, while in the most compliant patients the weight loss reached up to 39 kg. In addition, there was significant improvement into diabetes mellitus, hypertension, dyslipidemia, and fatty liveras. Its safety and tolerability were extremely acceptable. Conclusion: Our data indicates that in well-selected patients, BIB is an effective device, which with minimum complications helps to achieve body weight loss and resolve many obesity related

  9. Evaluation of Factors Influencing Liver Function Test in On-Pump Coronary Artery Bypass Graft Surgery

    Directory of Open Access Journals (Sweden)

    Shahrbano Shahbazi

    2013-12-01

    Full Text Available Background: Liver dysfunction during on-pump coronary artery bypass graft surgery (CABG is a rare complication but is associated with significant morbidity and mortality. The ability to identify high-risk patients may be helpful in planning appropriate management strategies. We aimed to evaluate the factors influencing liver function tests during on-pump CABG. Methods: In 146 patients scheduled for on-pump CABG, the liver function test was done preoperatively and on the first postoperative day. Some preoperative and intraoperative risk factors were checked and then the postoperative liver function tests were compared with the preoperative ones. Probable relationships between these changes and the preoperative and intraoperative risk factors were studied. Results: A medical history of diabetes had a significant relationship with the changes in direct bilirubin. Preoperative central venous pressure had a significant relationship with the changes in aspartate aminotransferase and alanine aminotransferase. Use of intra-aortic balloon pump and duration of aortic cross-clamp were significantly related to the changes in the liver function tests except for alanine aminotransferase and alkaline phosphatase. Conclusion: It seems that the techniques for the reduction of cardiopulmonary bypass and aortic cross-clamp duration may be useful to protect liver function. We recommend that a larger population of patients be studied to confirm these findings.

  10. New frontiers in aortic therapy: focus on current trials and devices in transcatheter aortic valve replacement.

    Science.gov (United States)

    Gutsche, Jacob T; Patel, Prakash A; Walsh, Elizabeth K; Sophocles, Aris; Chern, Sy-Yeu S; Jones, David B; Anwaruddin, Saif; Desai, Nimesh D; Weiss, Stuart J; Augoustides, John G T

    2015-04-01

    The first decade of clinical experience with transcatheter aortic valve replacement since 2002 saw the development of 2 main valve systems, namely the Edwards Sapien balloon-expandable valve series and the Medtronic self-expanding CoreValve. These 2 valve platforms now have achieved commercial approval and application worldwide in patients with severe aortic stenosis whose perioperative risk for surgical intervention is high or extreme. In the second decade of transcatheter aortic valve replacement, clinical experience and refinements in valve design have resulted in clinical drift towards lower patient risk cohorts. There are currently 2 major trials, PARTNER II and SURTAVI, that are both evaluating the role of transcatheter aortic valve replacement in intermediate-risk patient cohorts. The results from these landmark trials may usher in a new clinical paradigm for transcatheter aortic valve replacement in its second decade. PMID:25572322

  11. Endoluminal treatment of aortic dissection

    Energy Technology Data Exchange (ETDEWEB)

    Chavan, Ajay; Lotz, Joachim; Galanski, Michael [Department of Diagnostic Radiology, Hannover Medical School, Carl Neuberg Strasse 1, 30625, Hannover (Germany); Oelert, Frank; Haverich, Axel; Karck, Matthias [Department of Thoracic and Cardiovascular Surgery, Hannover Medical School, Carl Neuberg Strasse 1, 30625, Hannover (Germany)

    2003-11-01

    Aortic dissection is most often a catastrophic medical emergency which, if untreated, can be potentially fatal. The intention of therapy in patients with aortic dissection is to prevent aortic rupture or aneurysm formation as well as to relieve branch vessel ischaemia. Patients with aortic dissection are often poor candidates for anaesthesia and surgery and the surgical procedure itself is challenging requiring thoracotomy, aortic cross clamping, blood transfusion as well as prolonged hospital stay in some cases. Operative mortality is especially high in patients with critical mesenteric or renal ischaemia. The past decade has experienced the emergence of a number of interventional radiological or minimally invasive techniques which have significantly improved the management of patients with aortic dissection. These include stent grafting for entry site closure to prevent aneurysmatic widening of the false lumen as well as percutaneous techniques such as balloon fenestration of the intimal flap and aortic true lumen stenting to alleviate branch vessel ischaemia. False lumen thrombosis following entry closure with stent grafts has been observed in 86-100% of patients, whereas percutaneous interventions are able to effectively relieve organ ischaemia in approximately 90% of the cases. In the years to come, it is to be expected that these endoluminal techniques will become the method of choice for treating most type-B dissections and will assist in significantly reducing the number of open surgical procedures required for type-A dissections. The intention of this article is to provide an overview of the current status of these endoluminal techniques based on our own experience as well as on a review of the relevant literature. (orig.)

  12. Endoluminal treatment of aortic dissection

    International Nuclear Information System (INIS)

    Aortic dissection is most often a catastrophic medical emergency which, if untreated, can be potentially fatal. The intention of therapy in patients with aortic dissection is to prevent aortic rupture or aneurysm formation as well as to relieve branch vessel ischaemia. Patients with aortic dissection are often poor candidates for anaesthesia and surgery and the surgical procedure itself is challenging requiring thoracotomy, aortic cross clamping, blood transfusion as well as prolonged hospital stay in some cases. Operative mortality is especially high in patients with critical mesenteric or renal ischaemia. The past decade has experienced the emergence of a number of interventional radiological or minimally invasive techniques which have significantly improved the management of patients with aortic dissection. These include stent grafting for entry site closure to prevent aneurysmatic widening of the false lumen as well as percutaneous techniques such as balloon fenestration of the intimal flap and aortic true lumen stenting to alleviate branch vessel ischaemia. False lumen thrombosis following entry closure with stent grafts has been observed in 86-100% of patients, whereas percutaneous interventions are able to effectively relieve organ ischaemia in approximately 90% of the cases. In the years to come, it is to be expected that these endoluminal techniques will become the method of choice for treating most type-B dissections and will assist in significantly reducing the number of open surgical procedures required for type-A dissections. The intention of this article is to provide an overview of the current status of these endoluminal techniques based on our own experience as well as on a review of the relevant literature. (orig.)

  13. Aortic stenting.

    Science.gov (United States)

    Droc, Ionel; Calinescu, Francisca Blanca; Droc, Gabriela; Blaj, Catalin; Dammrau, Rolf

    2015-01-01

    The approach to aortic pathology is nowadays more and more endovascular at both thoracic and abdominal levels. Thoracic stenting has gained worldwide acceptance as first intention to treat pathologies of the descending thoracic aorta. Indications have been extended to aortic arch aneurysms and also to diseases of the ascending aorta. The current devices in use for thoracic endovascular repair (TEVAR) are Medtronic Valiant, Gore TAG, Cook Tx2 and Jotec. The choice of the endograft depends on the thoracic aortic pathology and the anatomical suitability. The technological evolution of the abdominal aortic endografts was very rapid, arriving now at the fourth generation. We report the results of 55 elective cases of endovascular abdominal aortic repair (EVAR) performed in two vascular surgical centers in Romania and Germany. The prostheses used were 16 E-vita Abdominal XT, 12 Excluder, eight Talent, seven PowerLink, three Endurant and nine custom-made, fenestrated or branched from Jotec. The mean follow-up was 18 months with CT-scan, duplex ultrasound and contrast-enhanced ultrasound. The mortality was 2%. EVAR tends to become the gold standard for abdominal aortic aneurysm repair. Technological development of the devices with lowest profile introduction systems will permit to extend the anatomical indications to new frontiers. PMID:26200430

  14. Cardboard Engineering--Making a Force Pump.

    Science.gov (United States)

    Ward, Alan

    1994-01-01

    Describes a method for using cardboard and paper to make a pump for blowing up balloons. Includes construction diagrams, suggestions for application, and comparison of this force pump with those made commercially. (DDR)

  15. Transcatheter Aortic Valve Replacement in Bicuspid Aortic Valve Disease

    DEFF Research Database (Denmark)

    Mylotte, Darren; Lefevre, Thierry; Søndergaard, Lars;

    2014-01-01

    .7%; type 1 BAV was 68.3%; and type 2 BAV was 5.0%. Multislice computed tomography (MSCT)-based TAV sizing was used in 63.5% of patients (77.1% balloon-expandable THV vs. 56.0% self-expandable THV, p = 0.02). Procedural mortality was 3.6%, with TAV embolization in 2.2% and conversion to surgery in 2.2%. The......BACKGROUND: Limited information exists describing the results of transcatheter aortic valve (TAV) replacement in patients with bicuspid aortic valve (BAV) disease (TAV-in-BAV). OBJECTIVES: This study sought to evaluate clinical outcomes of a large cohort of patients undergoing TAV-in-BAV. METHODS......: We retrospectively collected baseline characteristics, procedural data, and clinical follow-up findings from 12 centers in Europe and Canada that had performed TAV-in-BAV. RESULTS: A total of 139 patients underwent TAV-in-BAV with the balloon-expandable transcatheter heart valve (THV) (n = 48) or...

  16. Bicuspid aortic valve and severe aortic stenosis in a newborn exposed to carbamazapine during pregnancy.

    Science.gov (United States)

    Karataş, Zehra; Karataş, Ahmet; Özlü, Tülay; Goksugur, Sevil B; Varan, Birgül

    2014-01-01

    The use of antiepileptic drugs increases the risk of major congenital malformations during pregnancy. Here, we report an infant who had a history of in-utero carbamazepine exposure and who was born with a cardiac malformation. The infant was born at 39 weeks of gestation vaginally to an epileptic mother who had been treated with carbamazepine throughout her pregnancy. He was referred due to cardiac murmur in the second week of his life. The mother had not received folic acid supplementation. Transthoracic echocardiography revealed bicuspid aortic valve, mild aortic stenosis, patent ductus arteriosus, patent foramen ovale and the renal ultrasound revealed mild left hydronephrosis. Follow-up echocardiography performed 14 weeks later showed increased severity of aortic stenosis and percutaneous balloon aortic valvuloplasty was performed. To our knowledge, there is only one case report in the literature mentioning the association of a bicuspid aortic valve and aortic stenosis with oxcarbazepine exposure, which is a structural derivative of carbamazepine. However, there are no reports for association with carbamazepine itself. Bicuspid aorta and aortic stenosis may be among the cardiac malformations that result from the teratogenic effect of carbamazepine. PMID:25584038

  17. 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.

  18. Bursting water balloons

    CERN Document Server

    Lund, Hugh M

    2011-01-01

    The impact and rupture of water-filled balloons upon a flat, rigid surface is studied experimentally, for which three distinct stages of the flow are observed. Due to the impact, waves are formed on the balloon's surface for which the restoring force is tension in the latex. Immediately following rupture of the membrane, a shear instability created by the retraction of the balloon is observed. At later times, a larger-scale growth of the interfacial amplitude is observed, that may be regarded as a manifestation of a phenomenon known as the Richtmyer-Meshkov instability. This flow is closely related to the classical understanding of the Richtmyer-Meshkov instability for when there exists a density difference between the fluids inside and outside the balloon. Further, it is shown experimentally that this growth of the interface may also occur when there is no density difference across the balloon, a situation that does not arise for the standard Richtmyer-Meshkov instability.

  19. Aortic valve bypass

    DEFF Research Database (Denmark)

    Lund, Jens T; Jensen, Maiken Brit; Arendrup, Henrik; Ihlemann, Nikolaj

    2013-01-01

    In aortic valve bypass (AVB) a valve-containing conduit is connecting the apex of the left ventricle to the descending aorta. Candidates are patients with symptomatic aortic valve stenosis rejected for conventional aortic valve replacement (AVR) or transcatheter aortic valve implantation (TAVI...

  20. Balloon Design Software

    Science.gov (United States)

    Farley, Rodger

    2007-01-01

    PlanetaryBalloon Version 5.0 is a software package for the design of meridionally lobed planetary balloons. It operates in a Windows environment, and programming was done in Visual Basic 6. By including the effects of circular lobes with load tapes, skin mass, hoop and meridional stress, and elasticity in the structural elements, a more accurate balloon shape of practical construction can be determined as well as the room-temperature cut pattern for the gore shapes. The computer algorithm is formulated for sizing meridionally lobed balloons for any generalized atmosphere or planet. This also covers zero-pressure, over-pressure, and super-pressure balloons. Low circumferential loads with meridionally reinforced load tapes will produce shapes close to what are known as the "natural shape." The software allows for the design of constant angle, constant radius, or constant hoop stress balloons. It uses the desired payload capacity for given atmospheric conditions and determines the required volume, allowing users to design exactly to their requirements. The formulations are generalized to use any lift gas (or mixture of gases), any atmosphere, or any planet as described by the local acceleration of gravity. PlanetaryBalloon software has a comprehensive user manual that covers features ranging from, but not limited to, buoyancy and super-pressure, convenient design equations, shape formulation, and orthotropic stress/strain.

  1. The Descending Helium Balloon

    Science.gov (United States)

    Helseth, Lars Egil

    2014-01-01

    I describe a simple and fascinating experiment wherein helium leaks out of a rubber balloon, thereby causing it to descend. An estimate of the volumetric leakage rate is made by measuring its rate of descent.

  2. Resistive ballooning mode equation

    Energy Technology Data Exchange (ETDEWEB)

    Bateman, G.; Nelson, D. B.

    1978-10-01

    A second-order ordinary differential equation on each flux surface is derived for the high mode number limit of resistive MHD ballooning modes in tokamaks with arbitrary cross section, aspect ratio, and shear. The equation is structurally similar to that used to study ideal MHD ballooning modes computationally. The model used in this paper indicates that all tokamak plasmas are unstable, with growth rate proportional to resistivity when the pressure gradient is less than the critical value needed for ideal MHD stability.

  3. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... the primary reason that we end up offering patients aortic valve surgery in our community. Aortic stenosis ... a picture of the aortic valve from a patient who had a very diseased aortic valve. And ...

  4. Apical ballooning syndrome complicated by acute severe mitral regurgitation with left ventricular outflow obstruction – Case report

    Directory of Open Access Journals (Sweden)

    Celermajer David S

    2007-02-01

    Full Text Available Abstract Background Apical ballooning syndrome (or Takotsubo cardiomyopathy is a syndrome of transient left ventricular apical ballooning. Although first described in Japanese patients, it is now well reported in the Caucasian population. The syndrome mimicks an acute myocardial infarction but is characterised by the absence of obstructive coronary disease. We describe a serious and poorly understood complication of Takotsubo cardiomyopathy. Case Presentation We present the case of a 65 year-old lady referred to us from a rural hospital where she was treated with thrombolytic therapy for a presumed acute anterior myocardial infarction. Four hours after thrombolysis she developed acute pulmonary oedema and a new systolic murmur. It was presumed she had acute mitral regurgitation secondary to a ruptured papillary muscle, ischaemic dysfunction or an acute ventricular septal defect. Echocardiogram revealed severe mitral regurgitation, left ventricular apical ballooning, and systolic anterior motion of the mitral valve with significant left ventricular outflow tract gradient (60–70 mmHg. Coronary angiography revealed no obstructive coronary lesions. She had an intra-aortic balloon pump inserted with no improvement in her parlous haemodynamic state. We elected to replace her mitral valve to correct the outflow tract gradient and mitral regurgitation. Intra-operatively the mitral valve was mildly myxomatous but there were no structural abnormalities. She had a mechanical mitral valve replacement with a 29 mm St Jude valve. Post-operatively, her left ventricular outflow obstruction resolved and ventricular function returned to normal over the subsequent 10 days. She recovered well. Conclusion This case represents a serious and poorly understood association of Takotsubo cardiomyopathy with acute pulmonary oedema, severe mitral regurgitaton and systolic anterior motion of the mitral valve with significant left ventricular outflow tract obstruction. The

  5. Transcatheter Aortic Valve Implantation Experience with SAPIEN 3.

    Science.gov (United States)

    Ohno, Y; Tamburino, C; Barbanti, M

    2015-06-01

    Based on randomized trials with first generation devices, transcatheter aortic valve replacement (TAVI) has been included into the treatment strategy for high-risk and inoperable patients with severe aortic stenosis. Procedural complications remain a concern with TAVI, including stroke, vascular complications, paravalvular leak (PVL) and conduction disturbances. Addressing these limitations will support TAVI use in lower risk populations. This review discussed features and most recent clinical evidence of the new balloon-expandable THV (SAPIEN 3, Edwards Lifescience, Irvine, CA, USA). PMID:25900559

  6. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... to become you to our live webcast. Today we’re going to repair an abdominal aortic aneurysm ... and together as a team of multidisciplinary physicians, we’re going to repair an abdominal aortic aneurysm ...

  7. Aortic Aneurysm Statistics

    Science.gov (United States)

    ... connective tissue disorders, such as Marfan syndrome and Ehlers-Danlos syndrome, get thoracic aortic aneurysms. Signs and symptoms of thoracic aortic aneurysm can include Sharp, sudden pain in the chest or upper back. Shortness of ...

  8. Aortic growth rates in chronic aortic dissection

    International Nuclear Information System (INIS)

    Aim: To determine and compare rates of descending aortic enlargement and complications in chronic aortic dissection with and without a proximal aortic graft. Methods and materials: Fifty-two patients with dissection involving the descending aorta and who had undergone at least two computed tomography (CT) examinations at our institution between November, 1993 and February, 2004 were identified, including 24 non-operated patients (four type A, 20 type B) and 28 operated patients (type A). CT examinations per patient ranged from two to 10, and follow-up ranged from 1-123 months (mean 49 months, median 38.5 months). On each CT image, the aortic short axis (SA), false lumen (FL), and true lumen (TL) diameters were measured at the longitudinal midpoint of the dissection and at the point of maximum aortic diameter. Complications were tabulated, including aortic rupture and aortic enlargement requiring surgery. Results: For non-operated patients, the midpoint and maximum point SA, TL, and FL diameters increased significantly over time. For operated patients, the midpoint and maximum point SA and FL diameters increased significantly over time. In both groups, aortic enlargement was predominantly due to FL expansion. Diameter increases in non-operated patients were significantly larger than those in operated patients. The rate of change in aortic diameter was constant, regardless of aortic size. Four non-operated and six operated patients developed aortic complications. Conclusions: In patients with a dissection involving the descending thoracic aorta, the FL increased in diameter over time, at a constant rate, and to a greater degree in non-operated patients (mostly type B) compared with operated patients (all type A)

  9. Universal stratospheric balloon gradiometer

    Science.gov (United States)

    Tsvetkov, Yury; Filippov, Sergey; Brekhov, Oleg; Nikolaev, Nikolay

    The study of the interior structure of the Earth and laws of its evolution is one of the most difficult problems of natural science. Among the geophysical fields the anomaly magnetic field is one of the most informational in questions of the Earth’s crust structure. Many important parameters of an environment are expedient for measuring at lower altitudes, than satellite ones. So, one of the alternatives is stratospheric balloon survey. The balloon flight altitudes cover the range from 20 to 50 km. At such altitudes there are steady zone air flows due to which the balloon flight trajectories can be of any direction, including round-the-world (round-the-pole). For investigation of Earth's magnetic field one of the examples of such sounding system have been designed, developed and maintained at IZMIRAN and MAI during already about 25 years. This system consists of three instrumental containers uniformly placed along a vertical 6 km line. Up today this set has been used only for geomagnetic purposes. So we describe this system on example of the measuring of the geomagnetic field gradient. System allows measuring a module and vertical gradient of the geomagnetic field along the whole flight trajectory and so one’s name is - stratospheric balloon magnetic gradiometer (SMBG). The GPS-receivers, located in each instrumental container, fix the flight coordinates to within several tens meters. Process of SBMG deployment, feature of the exit of rope from the magazine at the moment of balloon launching has been studied. Used magazine is cellular type. The hodograph of the measuring base of SBMG and the technique of correction of the deviations of the measuring base from the vertical line (introduction of the amendments for the deviation) during the flight have been investigated. It is shown that estimation of the normal level of values of the vertical gradient of the geomagnetic field is determined by the accuracy of determining the length of the measuring base SBMG

  10. 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...

  11. Mars Solar Balloon Lander Project

    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...

  12. JACEE long duration balloon flights

    International Nuclear Information System (INIS)

    JACEE balloon-borne emulsion chamber detectors are used to observe the spectra and interactions of cosmic ray protons and nuclei in the energy range 1-100A TeV. Experience with long duration mid-latitude balloon flights and characteristics of the detector system that make it ideal for planned Antarctic balloon flights are discussed. 5 refs., 2 figs

  13. Comments on ideal ballooning

    International Nuclear Information System (INIS)

    Ideal ballooning modes are investigated for the case of plane magnetized slab geometry. Toroidal effects are simulated by a gravitational acceleration periodically varying along magnetic field lines. High shear is shown to be very effective in stabilizing these modes even when field line curvature is most unfavorable to their stability

  14. Radiotherapy-induced aortic valve disease associated with porcelain aorta

    International Nuclear Information System (INIS)

    Mediastinal irradiation has been reported to induce cardiac disease such as pericarditis, valvular dysfunction, conduction abnormalities, accelerated arteriosclerosis of the coronary arteries, and also calcifications of the ascending aorta. We herein describe a case of radiotherapy-induced porcelain aorta and aortic valve disease and their surgical treatment. The patient was diagnosed with myasthenia gravis (MG) in 1965 (Osserman's type II), and mediastinal irradiation was performed in 1970 for treatment of thymic tumor associated with MG. Thirty years after radiation therapy, complete atrioventricular block and aortic valve disease with severe calcification of the ascending aorta and aortic arch (porcelain aorta) were detected on echo cardiogram and cardiac catheterization. A permanent pacemaker was implanted via the left subclavian vein and aortic valve replacement was performed under extracorporeal circulation established by selective cerebral perfusion and balloon occlusion instead of aortic cross-clamping. As no risk factors of arteriosclerosis such as hypercholesterolemia, hyperglycemia and hypertension were apparent, we concluded that the aortic valve disease and porcelain aorta were primarily induced by radiotherapy. (author)

  15. Aortic Valve Sparing in Different Aortic Valve and Aortic Root Conditions.

    Science.gov (United States)

    David, Tirone E

    2016-08-01

    The development of aortic valve-sparing operations (reimplantation of the aortic valve and remodeling of the aortic root) expanded the surgical armamentarium for treating patients with aortic root dilation caused by a variety of disorders. Young adults with aortic root aneurysms associated with genetic syndromes are ideal candidates for reimplantation of the aortic valve, and the long-term results have been excellent. Incompetent bicuspid aortic valves with dilated aortic annuli are also satisfactorily treated with the same type of operation. Older patients with ascending aortic aneurysm and aortic insufficiency secondary to dilated sinotubular junction and a normal aortic annulus can be treated with remodeling of the aortic root or with reimplantation of the aortic valve. The first procedure is simpler, and both procedures are likely equally effective. As with any heart valve-preserving procedure, patient selection and surgical expertise are keys to successful and durable repairs. PMID:27491910

  16. Transcatheter aortic valve implantation in a patient with bicuspid aortic stenosis and a borderline-sized annulus.

    Science.gov (United States)

    Colkesen, Yucel; Baykan, Oytun; Dagdelen, Sinan; Cayli, Murat

    2015-11-01

    Bicuspid aortic valve (BAV) is currently considered an exclusion criterion for transcatheter aortic valve implantation (TAVI). The risk of adverse aortic events such as incomplete sealing, severe paravalvular regurgitation or dislocation due to elliptic shape and asymmetric calcifications in annulus are higher in TAVI. In this case report, we detailed a case of successful trans-femoral TAVI in a 51-year old male with BAV and its management without in-hospital and 30-day complications. The challenge in this case was the patient's anatomy with a 27-mm annulus for balloon expandable device. The applied strategy was balloon sizing and overdilating the 29-mm stented valve with additional volume that obviated re-ballooning. Trans-femoral TAVI was performed uneventfully under fluoroscopic and transoesophageal echocardiography guidance. A multidetector computed tomography (MDCT) evaluation at 1 month did not show device dislodgement or any other complications. Evidence for evaluation post-TAVI is not sufficient in BAV. We believe patients with BAV should undergo a comprehensive assessment after TAVI including MDCT evaluation. PMID:26265070

  17. O uso do balão intra-aórtico no pré-operatório de cirurgia de revascularização miocárdica, associada à disfunção ventricular grave The use of preoperative intra-aortic balloon in myocardial revascularization surgery associated to severe ventricular dysfunction

    Directory of Open Access Journals (Sweden)

    Marcelo Kern

    2006-02-01

    Full Text Available OBJETIVO: Avaliar a efetividade do Balão Intra-Aórtico (BIAo profilático em cirurgia de revascularização miocárdica (CRM eletiva, para prevenir o infarto trans ou pós-operatório e para reduzir a mortalidade intra-hospitalar nos pacientes com baixa fração de ejeção ventricular esquerda. MÉTODOS: Em modelo de estudo de coorte, foram analisados 239 pacientes com fração de ejeção do ventrículo esquerdo inferior ou igual a 40%, submetidos à CRM eletiva com circulação extracorpórea (CEC, no período compreendido entre março de 1995 a fevereiro de 2001. RESULTADOS: Destes, 58 pacientes receberam BIAo pré-operatório e os demais foram operados sem assistência circulatória (grupo controle. Os dois grupos de pacientes tinham características semelhantes quanto a fatores associados aos desfechos em questão. Ocorreram 5 (8,6% óbitos no grupo com BIAo e 21 (11,6%, no grupo controle (diferença não-signifícativa. Ocorreram 2 (3,4% infartos no grupo com BIAo e 28 (15,5%, no grupo controle BIAo (p OBJECTIVE: To evaluate the effectiveness of prophylactic intra-aortic balloon (IAB in elective myocardial revascularization surgery (MRS, to prevent trans or post-operative infarction and reduce intra-hospital mortality in patients with low left ventricular ejection fraction. METHODS: Using a cohort study model, 239 patients with left ventricular ejection fraction <40%, submitted to elective MRS with extracorporeal circulation (ECC were evaluated from March 1995 to February 2001. RESULTS: Of these, 58 patients received preoperative IAB and the remainder underwent surgery without circulatory assistance (control group. The two groups of patients had similar characteristics regarding factors associated to the pertaining outcomes. There were five demises (8.6% in the group with IAB and 21 (11.6% in the control group (non-significant difference. There were 2 (3.4% infarctions in the IAB group and 28 (15.5% in the control group (p< 0

  18. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... to help prevent aortic stenosis? There's no prophylactic methods that anybody can take to prevent aortic stenosis ... to progression and aortic sclerosis is not a reason to need an operation or aggressive management at ...

  19. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... opens freely when the heart contracts. On the right, we see a picture of the aortic valve ... the aortic valve because the probe is sitting right behind the aortic valve. Lots of patients on ...

  20. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... surgery in our community. Aortic stenosis is a process by which the aortic valve, which is the ... and does not open easily or appropriately. This process starts out as a disease we call aortic ...

  1. Obesity and gastric balloon

    OpenAIRE

    Yasawy, Mohammed I; Al-Quorain, Abdulaziz A.; Anas M Hussameddin; Yasawy, Zakia M.; Al-Sulaiman, Raid M.

    2014-01-01

    Background: The obesity epidemic, which is among the most common nutritional disorders, is rising rapidly worldwide. It leads to several health problems such as metabolic disorders, stroke, and even cancer. Efforts to control obesity with exercise and diet have a limited value in obese patients and different approaches to do this have been tried. In this paper, we share our experience with bioenteric intragastric balloon (BIB) in treating obesity: Its safety, tolerability, and its efficacy in...

  2. Abdominal Aortic Aneurysms: Treatments

    Science.gov (United States)

    ... access catheters Vertebroplasty Women and vascular disease Women's health Social Media Facebook Twitter ... Abdominal Aortic Aneurysms Interventional Radiologists Treat Abdominal Aneurysms Nonsurgically Interventional radiologists are vascular ...

  3. Clad ballooning model in MELCOR

    International Nuclear Information System (INIS)

    Clad ballooning may substantially decrease the flow of fluids through the affected core region and may expose the inner cladding surface to oxidation in the vicinity of rupture sites. The cladding ballooning model was not included in MELCOR 1.8.4. and consideration of incorporating the cladding ballooning model is scheduled as a post-1.8.4 release activity. The purpose of this paper is to analyze the effect of the clad ballooning model by the modified MELCOR 1.8.4 with this model. The typical accident sequence of a large LOCA scenario is selected. The clad ballooning model accelerates the accident progression compared to that without the ballooning model. The amount of hydrogen does not change much and it may be caused by ignoring the effect of flow area change. Future study is planning to analyze the flow redistribution

  4. Study on the dynamic change of endothelin in the development of stenosis of aorta after balloon injury in rabbits

    International Nuclear Information System (INIS)

    Objective: To study the dynamic change of endothelin (ET) in the blood with pathological and immunohistochemical changes of ET(ET-immunoreaction, ET-IR) in the development of stenosis of rabbit aorta after transluminal angioplasty. Methods: According to the different periods of being killed after micro-balloon angioplasty, 30 rabbits were divided randomly into 6 groups including 6-hour group, 1-day group, 3-day group, 7-day group, 15-day group and 22-day group. 3 out of 5 rabbits in each group were created as models of aortic endothelium injury by micro-balloon angioplasty, the rest 2 rabbits were taken as control. ET levels in the plasma were measured by ELISA before, as well as after micro-balloon angioplasty. Pathomorphological examination of the local traumatic aorta was carried out to observe the intimal thickness and the extent of lumen stenosis, and ET-IR was assessed by immunohistochemical technique performed on aortic wall after micro-balloon angioplasty. Results: (1) The major change of vascular stenosis was proliferation of vascular smooth muscle cell (VSMC) and endothelium. (2) ET levels in the plasma and ET-IR on the local aortic wall were significantly increased after micro-balloon angioplasty. Conclusions: The experimental results show that the major pathologic change of vascular stenosis is the obvionus proliferation of VSMC and endothelium. Further more, ET is a key factor in the development of vascular stenosis. (authors)

  5. Breakthrough in Mars balloon technology

    Science.gov (United States)

    Kerzhanovich, V. V.; Cutts, J. A.; Cooper, H. W.; Hall, J. L.; McDonald, B. A.; Pauken, M. T.; White, C. V.; Yavrouian, A. H.; Castano, A.; Cathey, H. M.; Fairbrother, D. A.; Smith, I. S.; Shreves, C. M.; Lachenmeier, T.; Rainwater, E.; Smith, M.

    2004-01-01

    Two prototypes of Mars superpressure balloons were flight tested for aerial deployment and inflation in the Earth's stratosphere in June, 2002. One was an 11.3 m diameter by 6.8 m high pumpkin balloon constructed from polyethylene film and Zylon (PBO) tendons, the second was a 10 m diameter spherical balloon constructed from 12 μm thick Mylar film. Aerial deployment and inflation occurred under parachute descent at 34 km altitude, mimicing the dynamic pressure environment expected during an actual Mars balloon mission. Two on-board video cameras were used on each flight to provide real-time upward and downward views of the flight train. Atmospheric pressure and temperature were also recorded. Both prototypes successfully deployed from their storage container during parachute descent at approximately 40 m/s. The pumpkin balloon also successfully inflated with a 440 g charge of helium gas injected over a 1.5-min period. Since the helium inflation system was deliberately retained after inflation in this test, the pumpkin balloon continued to fall to the ocean where it was recovered for post-flight analysis. The less robust spherical balloon achieved only a partial (~70%) inflation before a structural failure occurred in the balloon film resulting in the loss of the vehicle. This structural failure was diagnosed to result from the vigorous oscillatory motion of the partially inflated balloon, possibly compounded by contact between the balloon film and an instrumentation box above it on the flight train. These two flights together represent significant progress in the development of Mars superpressure balloon technology and pave the way for future flight tests that will include post-deployment flight of the prototype balloons at a stable altitude.

  6. Titan Balloon Convection Model Project

    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. Novel Use of an Apical-Femoral Wire Rail to Assist With Transfemoral Transcatheter Aortic Valve Replacement

    OpenAIRE

    Don, Creighton W.; Kim, Michael S.; Verrier, Edward D.; Aldea, Gabriel S.; Dean, Larry S.; Reisman, Mark; Mokadam, Nahush A

    2014-01-01

    The inability to reposition or retrieve balloon-expandable transcatheter aortic valves once they have been deployed requires implantation of the valve in the descending aorta or open surgical procedures to extract the valve. We describe the challenging transfemoral delivery of an Edwards Lifesciences Sapien valve wherein we had difficulty crossing the aortic valve and the guidewire position was compromised. We performed a transapical puncture to snare the guidewire and create a left ventricul...

  8. Relationship between Enhanced Intensity of Contrast Enhanced Ultrasound and Microvessel Density of Aortic Atherosclerostic Plaque in Rabbit Model

    OpenAIRE

    Xiangdong You; Pintong Huang; Chao Zhang; Minghui Wang; Ying Zhang; Yurong Hong; Shumei Wei; Chunmei Liu; Zhaoxia Pu; Jianmin Zhang; Shuyuan Chen

    2014-01-01

    The aim of this study was to evaluate the relationship between enhanced intensity of contrast enhanced ultrasound and microvessel density of aortic atherosclerotic plaque in rabbit model. The abdominal aortas of thirty-six male New Zealand rabbits were damaged by balloon expansion and the animals were then fed a high fat diet for 12 weeks. Twenty-seven plaques on the near aortic wall were detected using conventional ultrasound examination. The maximum thickness of each plaque was recorded. CE...

  9. Aortic arch malformations

    Energy Technology Data Exchange (ETDEWEB)

    Kellenberger, Christian J. [University Children' s Hospital, Department of Diagnostic Imaging, Zuerich (Switzerland)

    2010-06-15

    Although anomalies of the aortic arch and its branches are relatively uncommon malformations, they are often associated with congenital heart disease. Isolated lesions may be clinically significant when the airways are compromised by a vascular ring. In this article, the development and imaging appearance of the aortic arch system and its various malformations are reviewed. (orig.)

  10. Imaging in aortic dissection

    International Nuclear Information System (INIS)

    Aortic dissection (AD) is a catastrophic aortic disease. Imaging techniques play an invaluable role in the diagnostic evaluation and management of patients with AD. Major signs of AD with different imaging modalities are described in this article with a pertinent discussion on guidelines for the optimized approach of imaging study (13 refs.)

  11. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available Aortic Aneurysm Repair May 7, 2009 Good afternoon. Welcome to the Baptist Cardiac and Vascular Institute here in Miami. My name ... our live webcast. Today we’re going to repair an abdominal aortic aneurysm using a technology called ...

  12. Preoperative intra-aortic counterpulsation in high-risk patients undergoing cardiac surgery: a meta-analysis of randomized controlled trials†.

    Science.gov (United States)

    Pilarczyk, Kevin; Boening, Andreas; Jakob, Heinz; Langebartels, Georg; Markewitz, Andreas; Haake, Nils; Heringlake, Matthias; Trummer, Georg

    2016-01-01

    In contrast to the results of previous studies, recent randomized controlled trials (RCTs) failed to show a benefit of prophylactic aortic counterpulsation in high-risk patients undergoing cardiac surgery. The present analysis aims to redefine the effects of this treatment modality in the light of this new evidence. MEDLINE, EMBASE, CENTRAL/CCTR, Google Scholar and reference lists of relevant articles were searched for full-text articles of RCTs in English or German. Assessments for eligibility, relevance, study validity and data extraction were performed by two reviewers independently using prespecified criteria. The primary outcome was hospital mortality. A total of nine eligible RCTs with 1171 patients were identified: 577 patients were treated preoperatively with intra-aortic balloon pump (IABP) and 594 patients served as controls. The pooled odds ratio (OR) for hospital mortality (22 hospital deaths in the intervention arm, 54 in the control group) was 0.381 (95% CI 0.230-0.629; P control] = 347) also showed a statistically significant improvement in mortality for preoperative IABP implantation (fixed-effects model: OR 0.267, 95% CI 0.129-0.552, P definition of high-risk patients, an adequately powered, prospective RCT is necessary to find a definite answer to the question, if certain groups of patients undergoing cardiac surgery benefit from a prophylactic IABP insertion. PMID:26245629

  13. Nationwide Eclipse Ballooning Project

    Science.gov (United States)

    Colman Des Jardins, Angela; Berk Knighton, W.; Larimer, Randal; Mayer-Gawlik, Shane; Fowler, Jennifer; Harmon, Christina; Koehler, Christopher; Guzik, Gregory; Flaten, James; Nolby, Caitlin; Granger, Douglas; Stewart, Michael

    2016-05-01

    The purpose of the Nationwide Eclipse Ballooning Project is to make the most of the 2017 rare eclipse event in four main areas: public engagement, workforce development, partnership development, and science. The Project is focused on two efforts, both student-led: online live video of the eclipse from the edge of space and the study of the atmospheric response to the eclipse. These efforts, however, involving more than 60 teams across the US, are challenging in many ways. Therefore, the Project is leveraging the NASA Space Grant and NOAA atmospheric science communities to make it a success. The first and primary topic of this poster is the NASA Space Grant supported online live video effort. College and high school students on 48 teams from 31 states will conduct high altitude balloon flights from 15-20 locations across the 8/21/2017 total eclipse path, sending live video and images from near space to a national website. Video and images of a total solar eclipse from near space are fascinating and rare. It’s never been done live and certainly not in a network of coverage across a continent. In addition to the live video to the web, these teams are engaged in several other science experiments as secondary payloads. We also briefly highlight the eclipse atmospheric science effort, where about a dozen teams will launch over one hundred radiosondes from across the 2017 path, recording an unprecedented atmospheric data sample. Collected data will include temperature, density, wind, humidity, and ozone measurements.

  14. A system for visualization and automatic placement of the endoclamp balloon catheter

    OpenAIRE

    Furtado, H.; Stüdeli, T.; Sette, M; Samset, E.; Gersak, B

    2010-01-01

    The European research network "Augmented Reality in Surgery" (ARIS*ER) developed a system that supports minimally invasive cardiac surgery based on augmented reality (AR) technology. The system supports the surgical team during aortic endoclamping where a balloon catheter has to be positioned and kept in place within the aorta. The presented system addresses the two biggest difficulties of the task: lack of visualization and difficulty in maneuvering the catheter. The system was developed usi...

  15. How much of the intraaortic balloon volume is displaced toward the coronary circulation?

    OpenAIRE

    Kolyva, C; Pantalos, GM; Pepper, JR; Khir, AW

    2010-01-01

    This is a post-print version of the published article. Copyright @ 2010 The American Association for Thoracic Surgery. This article has been made available through the Brunel Open Access Publishing Fund. Objective: During intraaortic balloon inflation, blood volume is displaced toward the heart (Vtip), traveling retrograde in the descending aorta, passing by the arch vessels, reaching the aortic root (Vroot), and eventually perfusing the coronary circulation (Vcor). Vcor leads to corona...

  16. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... years, and his aneurysm has now grown to 5.4 centimeters. And this is actually an important ... balloon is trying to iron out the attachment. 5 So right now we have the first half ...

  17. Balloon catheter coronary angioplasty

    International Nuclear Information System (INIS)

    The author has produced a reference and teaching book on balloon angioplasty. Because it borders in surgery and is performed on an awake patient without circulatory assistance, it is a complex and demanding procedure that requires thorough knowledge before it is attempted. The text is divided into seven sections. The first section describes coronary anatomy and pathophysiology, defines the objectives and mechanisms of the procedure and lists four possible physiologic results. The next section describes equipment in the catheterization laboratory, catheters, guidewires and required personnel. The following section is on the procedure itself and includes a discussion of examination, testing, technique and follow-up. The fourth section details possible complications that can occur during the procedure, such as coronary spasms, occlusion, thrombosis, perforations and ruptures, and also discusses cardiac surgery after failed angioplasty. The fifth section details complex or unusual cases that can occur. The sixth and seventh sections discuss radiation, alternative procedures and the future of angioplasty

  18. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... Rua, and together as a team of multidisciplinary physicians, we’re going to repair an abdominal aortic ... takes a special type of training. Both the doctors in the room are board certified and highly ...

  19. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... the age of 65. It’s most common in males. There is an increasing number, due to the ... The risk factors for abdominal aortic aneurysms are males over 60, hardening of the arteries, which is ...

  20. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... wall will actually thin out. And the big risk here is that if this gets too big ... to the aging baby boomers. Next slide. The risk factors for abdominal aortic aneurysms are males over ...

  1. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... this procedure. So let’s go back now and learn a little bit about abdominal aortic aneurysms. Great. ... And one of the things that I’m learning from this movie as we looking at these ...

  2. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... atherosclerosis, high blood pressure, smokers, or a family history of abdominal aortic aneurysms. Today’s patient is a ... screened. In fact, patients who have a family history of aneurysm, men who are smoking over the ...

  3. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... to the aging baby boomers. Next slide. The risk factors for abdominal aortic aneurysms are males over 60, ... doing a good examination and also accessing for risk factors. So we have a very integrated team here, ...

  4. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... as atherosclerosis, high blood pressure, smokers, or a family history of abdominal aortic aneurysms. Today’s patient is ... be screened. In fact, patients who have a family history of aneurysm, men who are smoking over ...

  5. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... this is to prevent rupture and to prevent death from rupture. This area just underneath the renal ... Okay. Abdominal aortic aneurysms cause approximately 15,000 deaths in the United States each year. It affects ...

  6. Aortic valve replacement

    DEFF Research Database (Denmark)

    Kapetanakis, Emmanouil I; Athanasiou, Thanos; Mestres, Carlos A;

    2008-01-01

    BACKGROUND AND AIMS OF THE STUDY: Prompted by anecdotal evidence and observations by surgeons, an investigation was undertaken into the potential differences in implanted aortic valve prosthesis sizes, during aortic valve replacement (AVR) procedures, between northern and southern European countr...... southern European countries. Imbalances in the prevalence of rheumatic heart disease, health resource availability and variations in surgical practice throughout Europe might be possible etiological causes....

  7. Are Aortic Stent Grafts Safe in Pregnancy?

    OpenAIRE

    Nader Khandanpour; Mehta, Tapan A.; Adiseshiah, M; Meyer, Felicity J.

    2015-01-01

    Aortic stent grafts are increasingly used to treat aortic aneurysms and also other aortic pathologies. The safety of aortic stent grafts in pregnancy has never been studied or reported. We report on two cases of aortic stent grafts in pregnant women and discuss the effect of pregnancy on these aortic stent grafts.

  8. 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...

  9. [Balloon valvuloplasty in stenotic bioprosthesis].

    Science.gov (United States)

    Astudillo, R; Farell, J; Ariza, H; González Carmona, V M; Abundes, A; Tello, R; López Cuellar, M

    1992-01-01

    The results of balloon valvuloplasty performed on five patients with stenotic bioprosthesis treated in the Hospital de Cardiología Centro Médico Nacional Siglo XXI, are presented. All five bioprosthesis were right sided, two in tricuspid position, one in pulmonary valve position and two in valvulated conduits from right ventricle to pulmonary artery. In all cases a pressure gradient reduction was achieved, an improvement of clinical functional class and heart failure manifestations were obtained. Mansfields balloons were used. One in two patients, and two balloons in three. We had not complications with the procedure. We conclude that balloon valvuloplasty on bioprosthesis is a safe and dependable procedure to be used in right sided bioprosthesis. PMID:1482221

  10. 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...

  11. Aortic regurgitation after transcatheter aortic valve replacement.

    Science.gov (United States)

    Werner, Nikos; Sinning, Jan-Malte

    2014-01-01

    Paravalvular aortic regurgitation (AR) negatively affects prognosis following transcatheter aortic valve replacement (TAVR). As transcatheter heart valves (THV) are anchored using a certain degree of oversizing at the level of the aortic annulus, incomplete stent frame expansion because of heavily annular calcifications, suboptimal placement of the prosthesis, and/or annulus-prosthesis size-mismatch can contribute to paravalvular AR with subsequent increased mortality risk. Echocardiography is essential to differentiate between transvalvular and paravalvular AR and to further elucidate the etiology of AR during the procedure. However, because echocardiographic quantification of AR in TAVR patients remains challenging, especially in the implantation situation, a multimodal approach to the evaluation of AR with use of hemodynamic measurements and imaging modalities is useful to precisely quantify the severity of AR immediately after valve deployment. "Next-generation" THVs are already on the market and first results show that paravalvular AR related to design modifications (eg, paravalvular space-fillers, full repositionability) are rarely seen in these valve types.  PMID:24632758

  12. Experimental Study and Early Clinical Application Of a Sutureless Aortic Bioprosthesis

    Directory of Open Access Journals (Sweden)

    Walter J. Gomes

    2015-10-01

    Full Text Available ABSTRACT INTRODUCTION: The conventional aortic valve replacement is the treatment of choice for symptomatic severe aortic stenosis. Transcatheter technique is a viable alternative with promising results for inoperable patients. Sutureless bioprostheses have shown benefits in high-risk patients, such as reduction of aortic clamping and cardiopulmonary bypass, decreasing risks and adverse effects. OBJECTIVE: The objective of this study was to experimentally evaluate the implantation of a novel balloon-expandable aortic valve with sutureless bioprosthesis in sheep and report the early clinical application. METHODS: The bioprosthesis is made of a metal frame and bovine pericardium leaflets, encapsulated in a catheter. The animals underwent left thoracotomy and the cardiopulmonary bypass was established. The sutureless bioprosthesis was deployed to the aortic valve, with 1/3 of the structure on the left ventricular face. Cardiopulmonary bypass, aortic clamping and deployment times were recorded. Echocardiograms were performed before, during and after the surgery. The bioprosthesis was initially implanted in an 85 year-old patient with aortic stenosis and high risk for conventional surgery, EuroSCORE 40 and multiple comorbidities. RESULTS: The sutureless bioprosthesis was rapidly deployed (50-170 seconds; average=95 seconds. The aortic clamping time ranged from 6-10 minutes, average of 7 minutes; the mean cardiopulmonary bypass time was 71 minutes. Bioprostheses were properly positioned without perivalvar leak. In the first operated patient the aortic clamp time was 39 minutes and the patient had good postoperative course. CONCLUSION: The deployment of the sutureless bioprosthesis was safe and effective, thereby representing a new alternative to conventional surgery or transcatheter in moderate- to high-risk patients with severe aortic stenosis.

  13. Fetal critical aortic stenosis with natural improvement of hydrops fetalis due to spontaneous relief of severe restrictive atrial communication.

    Science.gov (United States)

    Ide, Tetsuya; Miyoshi, Takekazu; Kitano, Masataka; Kurosaki, Ken-ichi; Yoshimatsu, Jun

    2015-07-01

    We describe a rare case of fetal critical aortic stenosis with spontaneous relief of severe restrictive atrial communication, resulting in complete resolution of hydrops fetalis in utero. Fetal ultrasonography showed hydrops fetalis caused by critical aortic stenosis with a severely restrictive foramen ovale and severe mitral regurgitation at 23 weeks of gestation. Hydrops fetalis, however, spontaneously resolved, showing an obvious increase of flow through the foramen ovale and pulmonary vein at 26 weeks of gestation. The neonate required balloon dilation of the aortic valve and balloon atrioseptostomy immediately after birth and also received bilateral pulmonary artery banding and arterial duct stenting 1 week later. The patient was in good condition after conversion to biventricular circulation via Ross procedure at 8 months old. The present case suggests that atrioseptostomy as a fetal intervention may improve outcome in even a hydropic condition. PMID:25772579

  14. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... aortic stenosis, are there any activities that I should avoid doing? That's a great question, Jim. Generally ... do not have symptoms but have aortic stenosis should be considered for surgery. Age, in and of ...

  15. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... who have symptomatic aortic stenosis of a severe nature. It's even been liberalized in some patient populations ... the heart. The aortic valve, because of its nature being in back of the heart, is not ...

  16. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... up offering patients aortic valve surgery in our community. Aortic stenosis is a process by which the ... basic valve types that we use in our practice, those being tissue valves and mechanical valves. Tissue ...

  17. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... North Carolina. My name is John Streitman and I'm a cardiothoracic surgeon here at the Heart ... the corrective surgery of aortic valve replacement. If I have aortic stenosis, are there any activities that ...

  18. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... of that slide, that demonstrates that patients with New York Heart Association class heart failure 1 and ... right down the aortic valve and that's the new aortic valve that Dr. Streitman's placed. And you ...

  19. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... to help prevent aortic stenosis? There's no prophylactic methods that anybody can take to prevent aortic stenosis ... it will be archived on the ORlive Web site and ORlive.com and, of course, a link ...

  20. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... conditions or other significant medical problems, the American College of Cardiology recommends aortic valve replacement for basically ... more likely we see aortic stenosis. Again, patient education is part of the evaluation and management of ...

  1. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... see aortic stenosis in patients younger, in their 40s and 50s, if they have congenitally bicuspid, or ... a year and, you know, probably 30 to 40 minimally invasive aortic valve replacements a year. So ...

  2. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... Hospital in Pinehurst, North Carolina. During the program, it's easy for you to learn about the procedure. ... the aortic valve, and proceeds to aortic stenosis. It's really not felt to be due to wear ...

  3. Off-Pump Repair of a Post Myocardial Infarction Ventricular Septal Defect

    Directory of Open Access Journals (Sweden)

    Feridoun Sabzi

    2014-01-01

    Full Text Available Refractory cardiogenic shock meant that traditional patch repairs requiring cardiopulmonary bypass would be poorly tolerated and external sandwich closure of post myocardial ventricular septal defect (VSD appears to be simple and effective after initial myocardial infarction (MI. The three cases presented with a VSD after of acute MI with or without thrombolysed with streptokinase during patient admission. The general condition of the three patients was poor with pulmonary edema, low cardiac output and renal failure. The heart was approached through a median sternotomy. Off-pump coronary artery bypass grafting of the coronary artery lesion was done first using octopus and beating heart surgery method and latero - lateral septal plication was performed using sandwich technique. Low cardiac output managed with intra-aortic balloon pump in these patients accompanied with inotropic drugs. Post-operative transesophageal echocardiography revealed that VSD was closed completely in one patient and in two patients small residual VSD remained. More experience is required to ascertain whether this technique will become an accepted alternative to patch repairs.

  4. Aneurysms: thoracic aortic aneurysms.

    Science.gov (United States)

    Chun, Kevin C; Lee, Eugene S

    2015-04-01

    Thoracic aortic aneurysms (TAAs) have many possible etiologies, including congenital heart defects (eg, bicuspid aortic valves, coarctation of the aorta), inherited connective tissue disorders (eg, Marfan, Ehlers-Danlos, Loeys-Dietz syndromes), and degenerative conditions (eg, medial necrosis, atherosclerosis of the aortic wall). Symptoms of rupture include a severe tearing pain in the chest, back, or neck, sometimes associated with cardiovascular collapse. Before rupture, TAAs may exert pressure on other thoracic structures, leading to a variety of symptoms. However, most TAAs are asymptomatic and are found incidentally during imaging for other conditions. Diagnosis is confirmed with computed tomography scan or echocardiography. Asymptomatic TAAs should be monitored with imaging at specified intervals and patients referred for repair if the TAAs are enlarging rapidly (greater than 0.5 cm in diameter over 6 months for heritable etiologies; greater than 0.5 cm over 1 year for degenerative etiologies) or reach a critical aortic diameter threshold for elective surgery (5.5 cm for TAAs due to degenerative etiologies, 5.0 cm when associated with inherited syndromes). Open surgery is used most often to treat asymptomatic TAAs in the ascending aorta and aortic arch. Asymptomatic TAAs in the descending aorta often are treated medically with aggressive blood pressure control, though recent data suggest that endovascular procedures may result in better long-term survival rates. PMID:25860136

  5. Percutaneous Management of RetroFlex 3 Balloon Rupture and Separation of the Edwards Sapien Delivery System

    OpenAIRE

    Green, Kelly D.; Waked, Alain; Majeed, Usman; Fudim, Marat; Robbins, Mark A; Crenshaw, Marshall; Zhao, David

    2014-01-01

    We report the case of an 85-year-old woman with severe aortic stenosis who underwent transcatheter aortic valve replacement with use of the Edwards Sapien® valve system. The procedure was complicated by rupture of the valve-deployment balloon, with separation and retention of the nose cone of the RetroFlex 3® delivery system in the iliac artery. Our endovascular retrieval of the equipment was successful, and we achieved access-site hemostasis by deploying a covered stent. To our knowledge, th...

  6. Aortic dissection: case series

    Directory of Open Access Journals (Sweden)

    Bhavana Venkata Nagabhushana Rao

    2016-04-01

    Full Text Available Aortic dissection may not be attended by a physician in his lifetime, but he should possess all the clinical acumen to deal with as it is a catastrophic disease. Early and accurate diagnosis will save a life. Here we present three cases we faced in sequence over a period of two months. A case of extensive dissection arch to thoracic aorta, its display in detail. Second case eliciting ambiguity between coronary ischemia and aortic dissection. Management difficulties of such clinician situation are discussed. Third case, the fracture of a renal artery stent leading to severe hypertension, abdominal pain, and aortic dissection. Such case was not described in the literature to our knowledge. [Int J Res Med Sci 2016; 4(4.000: 1268-1271

  7. Valvoplastia aórtica por cateter-balão em emergência materno-fetal na adolescência Valvuloplastia aórtica por catéter con balón en emergencia materno-fetal en la adolescencia Aortic valvuloplasty with balloon catheter in maternal-fetal emergency in adolescence

    Directory of Open Access Journals (Sweden)

    Walkiria Samuel Avila

    2009-12-01

    Full Text Available O aumento do débito cardíaco durante a gravidez é causa de insuficiência cardíaca em portadoras de estenose valvar aórtica grave. A valvoplastia aórtica percutânea tem sido associada a graves complicações e reestenose valvar em curto prazo. O presente caso mostrou que a valvoplastia aórtica percutânea permitiu o alcance do parto com sobrevida da mãe e do feto, e que a interrupção do tratamento no pós-parto resultou em morte materna no puerpério tardio.El aumento del gasto cardiaco durante el embarazo es la causa de insuficiencia cardiaca en portadoras de estenosis valvular aórtica severa. Se viene asociando la valvuloplastia aórtica percutánea a severas complicaciones y reestenosis valvular en corto plazo. El presente caso reveló que la valvuloplastia aórtica percutánea permitió el alcance del parto con sobrevida de la madre y del feto, y que la interrupción del tratamiento en el postparto resultó en muerte materna en el puerperio tardío.The increase of cardiac output during pregnancy is the cause of heart failure in women with severe aortic valvular stenosis. Percutaneous aortic valvuloplasty has been associated with severe complications and short-term valvar restenosis. This case showed that percutaneous aortic valvuloplasty allowed both mother and fetus to survive after childbirth, and that postpartum treatment interruption resulted in maternal death in late postpartum care.

  8. Direct transcatheter aortic valve implantation with self-expandable bioprosthesis: Feasibility and safety

    Energy Technology Data Exchange (ETDEWEB)

    Fiorina, Claudia, E-mail: clafiorina@yahoo.it [Cardiac Catheterization Laboratory, Cardiothoracic Department, Spedali Civili, Brescia (Italy); Maffeo, Diego; Curello, Salvatore [Cardiac Catheterization Laboratory, Cardiothoracic Department, Spedali Civili, Brescia (Italy); Lipartiti, Felicia [Division of Cardiology, Cardiothoracic Department, Spedali Civili, Brescia (Italy); Chizzola, Giuliano [Cardiac Catheterization Laboratory, Cardiothoracic Department, Spedali Civili, Brescia (Italy); D' Aloia, Antonio [Division of Cardiology, Cardiothoracic Department, Spedali Civili, Brescia (Italy); Adamo, Marianna [Cardiac Catheterization Laboratory, Cardiothoracic Department, Spedali Civili, Brescia (Italy); Mastropierro, Rosy [Division of Cardiothoracic Anestesiology, Cardiothoracic Department, Spedali Civili, Brescia (Italy); Gavazzi, Emanuele [Department of Radiology, University of Brescia, Spedali Civili, Brescia (Italy); Ciccarese, Camilla; Chiari, Ermanna [Division of Cardiology, Cardiothoracic Department, Spedali Civili, Brescia (Italy); Ettori, Federica [Cardiac Catheterization Laboratory, Cardiothoracic Department, Spedali Civili, Brescia (Italy)

    2014-06-15

    Background: Balloon valvuloplasty has been considered a mandatory step of the transcatheter aortic valve implantation (TAVI), although it is not without risk. The aim of this work was to evaluate the feasibility and safety of TAVI performed without pre-dilation (direct TAVI) of the stenosed aortic valve. Material and Methods: Between June 2012 and June 2013, 55 consecutive TAVI performed without pre-dilation at our institution using the self-expandable CoreValve prosthesis (Medtronic, Minneapolis, MN) were analyzed and compared with 45 pre-dilated TAVI performed the previous year. Inclusion criteria were a symptomatic and severe aortic stenosis. Exclusion criteria were defined as presence of pure aortic regurgitation, degenerated surgical bioprosthesis or bicuspid aortic valve and prior procedure of balloon aortic valvuloplasty performed as a bridge to TAVI. Results: High-burden calcification in the device landing zone, assessed by CT scan, was found in most of the patients. The valve size implanted was similar in both groups. Device success was higher in direct TAVI (85% vs. 64%, p = 0.014), mostly driven by a significant lower incidence of paravalvular leak (PVL ≥2; 9% vs. 33%, p = 0.02). Safety combined end point at 30 days was similar in both groups. Conclusion: Compared to TAVI with pre-dilation, direct TAVI is feasible regardless of the presence of bulky calcified aortic valve and the valve size implanted. Device success was higher in direct TAVI, mostly driven by a lower incidence of paravalvular leak. Safety at 30 days was similar in two groups.

  9. The challenge to balloon science

    Science.gov (United States)

    Jones, W. Vernon

    A thorough review of the NASA balloon program in 1995 confirmed both the inherent importance of balloon science investigations and their value for developing technology for future space missions. A follow-on study in 1996 looked into restructuring the entire suborbital program, in order to find more efficient and effective ways of doing business. These studies were mandated by the adverse impact of NASA's declining budgets and work force constraints on all aspects of space research. The challenge is to accomplish more with less. The balloon program began stepping up to this challenge several years ago with the advent of 10 - 20 day long-duration flights in Antarctica. We must now push ahead with enhanced flight capabilities and with new science instrument technologies, as we forge alliances with other modes of low-cost access to space. Specifically, the development of sealed superpressure balloons could extend flight duration by another order of magnitude, to about 100 days, making ballooning even more competitive with space missions.

  10. BLOCKING SUN WITH ORBITING BALLOONS

    Energy Technology Data Exchange (ETDEWEB)

    Chul Park [Department of Aerospace Engineering, Kor ea Advanced Institute of Science and Technology, Daejeon (Korea)

    2008-09-30

    Sun's radiation power reaching Earth's surface can be reduced by letting large balloons circle the Earth in orbits at approximately 1000 km altitude. These balloons, made of plastic films 1 mm in thickness, of a diameter of approximately 46 km, will weigh about 10,000 tons each. A balloon will consist of one hundred of 100 ton pieces. They are transported to the orbit piece by piece, and are assembled there into the spherical shape. They are kept inflated with the vapor pressure of potassium and the electrostatic forces. The inclination angles of these balloons with respect to the solar ecliptic plane can be varied from zero to 90 degrees, although efficiency is highest with the zero degree inclination. If zero degree inclination is chosen, twenty-three of these will reduce the average sun's radiation by 0.01%. In the 1000 km orbits, which are stable and are populated only by space debris, these balloons will serve also to remove the debris.

  11. 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...

  12. Aortic Valve Disease

    Science.gov (United States)

    ... valve opens when the left ventricle squeezes to pump out blood, and closes in between heart beats to keep ... the left ventricle has to work harder to pump blood out through the valve. To do this extra ...

  13. Application of new balloon catheters in the treatment of congenital heart defects

    Science.gov (United States)

    Fiszer, Roland; Szkutnik, Małgorzata; Smerdziński, Sebastian; Chodór, Beata; Białkowski, Jacek

    2016-01-01

    Introduction Balloon angioplasty (BAP) and aortic or pulmonary balloon valvuloplasty (BAV, BPV) are well-established treatment options in congenital heart defects. Recently, significant technological progress has been made and new catheters have been implemented in clinical practice. Aim To analyze the results of BAP, BAV and BPV with the new balloon catheter Valver and its second generation Valver II, which the company Balton (Poland) launched and developed. These catheters have not been clinically evaluated yet. Material and methods We performed 64 interventions with Valver I and Valver II. With Valver I the following procedures were performed: 17 BPV (including 9 in tetralogy of Fallot – TOF), 10 BAV and 27 BAP in coarctations of the aorta (CoA) – including 9 native and 18 after surgery. With Valver II ten interventions were done – 3 BPV, 2 pulmonary supravalvular BAP (after switch operations), 2 BAP of recoarctations and 3 other BAP. Age of the patients ranged from a few days to 40 years. Results All procedures were completed successfully, without rupture of any balloon catheters. The pressure gradient drop was statistically significant in all groups: BPV in isolated pulmonary valvular stenosis 28.1 mm Hg (mean), BPV in TOF 18.7 mm Hg, BAV 32.8 mm Hg, BAP in native CoA 15.4 mm Hg and in recoarctations 18.6 mm Hg. In 3 cases during rapid deflation of Valver I, wrinkles of the balloons made it impossible to insert the whole balloon into the vascular sheath (all were removed surgically from the groin). No such complication occured with Valver II. Conclusions Valver balloon catheters are an effective treatment modality in different valvular and vascular stenoses. PMID:27625686

  14. Aortic wave dynamics and its influence on left ventricular workload.

    Directory of Open Access Journals (Sweden)

    Niema M Pahlevan

    Full Text Available The pumping mechanism of the heart is pulsatile, so the heart generates pulsatile flow that enters into the compliant aorta in the form of pressure and flow waves. We hypothesized that there exists a specific heart rate at which the external left ventricular (LV power is minimized. To test this hypothesis, we used a computational model to explore the effects of heart rate (HR and aortic rigidity on left ventricular (LV power requirement. While both mean and pulsatile parts of the pressure play an important role in LV power requirement elevation, at higher rigidities the effect of pulsatility becomes more dominant. For any given aortic rigidity, there exists an optimum HR that minimizes the LV power requirement at a given cardiac output. The optimum HR shifts to higher values as the aorta becomes more rigid. To conclude, there is an optimum condition for aortic waves that minimizes the LV pulsatile load and consequently the total LV workload.

  15. Balloon Exoplanet Nulling Interferometer (BENI)

    Science.gov (United States)

    Lyon, Richard G.; Clampin, Mark; Woodruff, Robert A.; Vasudevan, Gopal; Ford, Holland; Petro, Larry; Herman, Jay; Rinehart, Stephen; Carpenter, Kenneth; Marzouk, Joe

    2009-01-01

    We evaluate the feasibility of using a balloon-borne nulling interferometer to detect and characterize exosolar planets and debris disks. The existing instrument consists of a 3-telescope Fizeau imaging interferometer with 3 fast steering mirrors and 3 delay lines operating at 800 Hz for closed-loop control of wavefront errors and fine pointing. A compact visible nulling interferometer is under development which when coupled to the imaging interferometer would in-principle allow deep suppression of starlight. We have conducted atmospheric simulations of the environment above 100,000 feet and believe balloons are a feasible path forward towards detection and characterization of a limited set of exoplanets and their debris disks. Herein we will discuss the BENI instrument, the balloon environment and the feasibility of such as mission.

  16. [Hemodynamic analysis of a centrifugal blood pump].

    Science.gov (United States)

    Wang, Yang; Yang, Ming; Xu, Zihao; Zhuang, Xiaoqi; Li, Qilei; Xu, Liang

    2015-01-01

    This paper built the mathematical model of a centrifugal blood pump, which was designed by ourselves, combined it with that of the human cardiovascular system and simulated the coupling system using Matlab. Then we set up the experiment platform, linked the blood pump to mock human cardiovascular system in case of three-stage heart failure, and measured aortic pressure and flow under different speed. The comparison between experiment results and simulation results not only indicates the coupling model is correct and the blood pump works well, but also shows that with the increase of blood pump speed, the pulsation of aortic pressure and flow will be reduced, this situation will affect the structure and function of blood vessels. PMID:26027287

  17. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... re just dilating this to just get very good attachment of the device to the wall, and now we’re deflating the balloon. Barry, as you do that, one thing I think we failed to mention, it’s very ...

  18. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... catheters and our wires and do everything. We leave the sheathe in the artery, and that’s what he’s working right 14 now to secure. And that’s what the device went through a sheathe like this. The balloons go through a ... in and out. But we leave this one conduit, this one small tubing in ...

  19. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... to repair an abdominal aortic aneurysm using a technology called an “endograft,” which is sometimes called the “ ... separate area, and it’s because of this small technology that allows you to do this. Exactly. So ...

  20. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... the arteries, which is known as atherosclerosis, high blood pressure, smokers, or a family history of abdominal aortic ... imaging. We can integrate ultrasound imaging, the patient’s blood pressure, and so it’s a little bit like being ...

  1. Aortic Aneurysm Repair

    Medline Plus

    Full Text Available ... an abdominal aortic aneurysm. Normally this procedure takes us about 45 minutes to an hour of doctor work time, which is, I think, a fairly quick procedure to replace a major life-threatening problem in the patient’s abdomen. So you can see ...

  2. Aortic valve annuloplasty: new single suture technique.

    Science.gov (United States)

    Schöllhorn, Joachim; Rylski, Bartosz; Beyersdorf, Friedhelm

    2014-06-01

    Reconstruction strategies for aortic valve insufficiency in the presence of aortic annulus dilatation are usually surgically challenging. We demonstrate a simple, modified Taylor technique of downsizing and stabilization of the aortic annulus using a single internal base suture. Since April 2011, 22 consecutive patients have undergone safe aortic valve annuloplasty. No reoperations for aortic valve insufficiency and no deaths occurred. PMID:24882316

  3. Ballonnen in zee = balloons as marine litter

    NARCIS (Netherlands)

    Franeker, van J.A.

    2008-01-01

    Releasing balloons seems harmless. However, remains of balloons, especially valves and ribbons are becoming a common and persistent type of marine litter found on beaches. Following Dutch Queens day 2007, large numbers of Dutch balloons were found in Normandy, France. Animals may become entangled in

  4. 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

  5. Simulation study and function analysis of the dynamic aortic valve

    Institute of Scientific and Technical Information of China (English)

    XIA Dongdong; BAI Jing

    2006-01-01

    The dynamic aortic valve (DAV) is a new left ventricular assist device, a micro-axial blood pump implemented at the position of the aortic valve, pumping blood from the left ventricle into the aortic artery. The present dynamic aortic valve operates at 7 different rotation speeds, ranging from 3000 r/min (speed 1) to 9000 r/min (speed 7). Because in vivo experiments need a lot of live animals and take a long period of time, modeling and simulation have been widely used to simulate and analyze hydra-dynamic property of the DAV and its assisting effects. With the measurements from the mock circulatory loop, a mathematic model of the DAV is established and embedded into the previously developed canine circulatory system. Using this model, the effect of the DAV on the failing heart at each rotation speed level is investigated. The vital cardiac variables are computed and compared with in vivo experimental results, which are in good agreement with an acceptable difference mostly 15 %. The establishment of the DAV model and its simulation are useful for further improvement of the DAV device.

  6. Global electrodynamics from superpressure balloons

    Science.gov (United States)

    Holzworth, R. H.; Hu, H.

    1995-01-01

    Electric field and conductivity measurements in the stratosphere between November 1992 and March 1993 have been made using superpressure balloons in the southern hemisphere. Over 400 payload-days of data have been made during a record setting experiment called ELBBO (Extended Life Balloon Borne Observatories). This experiment resulted in 4 flights aloft simultaneously for over 2 months including one flight which lasted over 4 months. Electrodynamical coupling between the atmosphere and ionosphere is studied using the measured electric fields, and a simple empirical model of the stratospheric conductivity. Altitude profiles of conductivity have been obtained from several superpressure balloon flights using the large end-of-flight altitude swings on the last few days of each flight (as the balloon begins to loose superpressure). Coupling between the fields and atmospheric inertial waves has been observed. Effects and dynamics of the global circuit suggest that standard models are missing significant phenomena. Large scale ionospheric convection activity has been studied from the polar cap to the middle latitudes. Cusp latitude fields have been continuously measured for many days in a row.

  7. First direct aortic retrievable transcatheter aortic valve implantation in humans.

    Science.gov (United States)

    Chandrasekhar, Jaya; Glover, Chris; Labinaz, Marino; Ruel, Marc

    2014-11-01

    We describe 2 cases in which transcatheter aortic valve implantation was performed with a Portico prosthesis (St Jude Medical, St Paul, MN) through a direct aortic approach. In 1 of the cases, prosthesis retrieval was needed during the procedure and was essential to the successful outcome. This is the first report, to our knowledge, of direct aortic Portico prosthesis implantation, and it highlights the significance of the retrievable nature of this device. PMID:25442452

  8. Thoracic aortic aneurysm and dissection.

    Science.gov (United States)

    Goldfinger, Judith Z; Halperin, Jonathan L; Marin, Michael L; Stewart, Allan S; Eagle, Kim A; Fuster, Valentin

    2014-10-21

    Aortic dissection is the most devastating complication of thoracic aortic disease. In the more than 250 years since thoracic aortic dissection was first described, much has been learned about diseases of the thoracic aorta. In this review, we describe normal thoracic aortic size; risk factors for dissection, including genetic and inflammatory conditions; the underpinnings of genetic diseases associated with aneurysm and dissection, including Marfan syndrome and the role of transforming growth factor beta signaling; data on the role for medical therapies in aneurysmal disease, including beta-blockers, angiotensin receptor blockers, and angiotensin-converting enzyme inhibitors; prophylactic surgery for aneurysm; surgical techniques for the aortic root; and surgical and endovascular management of aneurysm and dissection for different aortic segments. PMID:25323262

  9. The development of coastal diffusion observation method with a captive balloon

    International Nuclear Information System (INIS)

    Apparatus whereby the dye cloud in a coastal area in diffusion experiment can be photographed was developed. It consists of a vinyl balloon two meters in diameter, a photographic device with the camera shutter released by wireless signals from the ground, and a winch to raise or lower the balloon. A maximum height of the balloon for taking photographs is 1000 m. During the single balloon flight, thirty photographs can be taken. With the balloon at a certain height, dye as the tracer in diffusion experiment is released at sea surface or a certain sea depth by dye-throwing means or pump, and then taking the photographs is started. Movement and diffusion of the dye are analyzed by means of the photographs taken. The apparatus is simple in mechanism and easy to transport. Dye experiment is possible in the surfe zone where a boat cannot enter. It is impossible, however, to raise the balloon in strong wind or sea breeze. Typical results of the dye diffusion experiment with the apparatus are given. (author)

  10. Abdominal aortic aneurysm surgery

    DEFF Research Database (Denmark)

    Gefke, K; Schroeder, T V; Thisted, B; Olsen, P S; Perko, M J; Agerskov, Kim; Røder, O; Lorentzen, Jørgen Ewald

    1994-01-01

    The goal of this study was to identify patients who need longer care in the ICU (more than 48 hours) following abdominal aortic aneurysm (AAA) surgery and to evaluate the influence of perioperative complications on short- and long-term survival and quality of life. AAA surgery was performed in 55......, 78% stated that their quality of life had improved or was unchanged after surgery and had resumed working. These data justify a therapeutically aggressive approach, including ICU therapy following AAA surgery, despite failure of one or more organ systems.......The goal of this study was to identify patients who need longer care in the ICU (more than 48 hours) following abdominal aortic aneurysm (AAA) surgery and to evaluate the influence of perioperative complications on short- and long-term survival and quality of life. AAA surgery was performed in 553...

  11. Perioperative management of endovascular abdominal aortic aneurysm repair

    International Nuclear Information System (INIS)

    Objective: To summarize the clinical experience of perioperative management in performing endovascular abdominal aortic aneurysm repair (EVAR). Methods: EVAR was performed in 22 patients with abdominal aortic aneurysm. The clinical data were retrospectively analyzed. Before treatment the functions of main organs were evaluated and certain measures were adopted in order to protect them. Useful parameters, including the length, diameter, angle and configuration of the proximal and distal aneurysmal neck, the relationship of the aneurysm to aortic branches, the distance from the lowest renal artery to the bifurcation of abdominal aorta, and the quality of access vessels (such as diameter, tortuosity and calcification degree) were determined and assessed with CTA. According to the parameters thus obtained, the suitable stent-graft with ideal diameter and length was selected, and the optimal surgery pattern was employed. Local anesthesia was employed in 20 patients, among them the local anesthesia had to be changed to general anesthesia in one. Epidural anesthesia was carried out in one patient through the surgically-reconstructed iliac artery access,and general anesthesia was employed in one patient who had Stanford type A aortic dissection. The lowest renal artery must be accurately localized before deployment of stent-graft was started. At least one patent internal iliac artery should be reserved when bilateral internal iliac arteries needed to be covered, to be covered by stages or to be reconstructed. After stent-graft placement, angiography must be performed to find out if there was any endoleak and, if any, to determine the type of endoleak and to deal with it properly. Two cases had proximal type I endoleak, so balloon dilation was employed in one and cuff implantation in another one. Distal type I endoleak occurred in one case, but, unfortunately, the iliac artery ruptured when balloon dilation was employed, therefore the patient had to receive vascular repair

  12. Percutaneous interventions for treating ischemic complications of aortic dissection

    Energy Technology Data Exchange (ETDEWEB)

    Chavan, Ajay; Luthe, Lars [Klinikum Oldenburg, Department of Diagnostic and Interventional Radiology, Oldenburg (Germany); Rosenthal, Herbert; Pfingsten, Stefanie; Galanski, Michael [Hannover Medical School, Department of Radiology, Hannover (Germany); Kutschka, Ingo; Haverich, Axel [Hannover Medical School, Department of Cardio-thoracic Surgery, Hannover (Germany); Easo, Jerry; Dapunt, Otto [Klinikum Oldenburg, Department of Cardio-thoracic Surgery, Oldenburg (Germany); Piepenbrock, Siegfried [Hannover Medical School, Department of Anaesthesia, Hannover (Germany)

    2009-02-15

    The aim of this study was to evaluate the role of percutaneous interventions in treating ischemia complicating aortic dissection. Forty-five patients with ischemia complicating aortic dissection were treated by balloon fenestration, true lumen stenting, angioplasty, or thrombolysis. Clinical and laboratory examinations were performed before and after intervention, and at the end of follow-up (median 37 months). Eighteen dissections were acute, 9 sub-acute, and 18 chronic. Mesenterohepatic ischemia resolved in 16 of 18 patients; lactate and SGOT values fell from 2.89 to 1.23 mmol/L (p=0.006) and from 165.9 to 59.7 U/L (p=0.034), respectively. In patients with renal ischemia, creatinine levels fell from 360.1 to 196.3 {mu}mol/L (p=0.007) accompanied by a significant reduction in blood pressure. Limb-threatening ischemia resolved in three of four patients; in 21 claudicants, the mean walking distance improved from 272 to 1,283 m (p=0.001). Spinal ischemia resolved completely or partially in six of eight patients. Adjunctive surgical measures were necessary in six patients. Overall 30-day mortality in the 45 patients was 6.7%; all three deaths were in patients with acute dissections (mortality in this subgroup 16.7%). Ischemia complicating aortic dissection can be effectively treated by percutaneous interventions resulting in good early and mid-term outcomes. (orig.)

  13. Inhibitory Effect of Diabetes on Proliferation of Vascular Smooth Muscle After Balloon Injury in Rat Aorta

    OpenAIRE

    Dahlfors, Gunilla; Chen, Yun; Gustafsson, Bertil; Arnqvist, Hans J.

    2000-01-01

    The effect of streptozotocin-induced diabetes on cell proliferation in rat aortic intima-media, as well as on local gene expression of transforming growth factor-β1 (TGF-β1) was studied. TGF-β1 mRNA was measured by solution hybridization and TGF-β1 protein by ELISA. Proliferation was measured by bromodeoxyuridine incorporation into DNA two days after balloon injury. All BrdU-labelled cells observed were smooth muscle cells. After a diabetes duration of 2 and 4 weeks, labelled cells were signi...

  14. Acute aortic intramural hematoma

    Energy Technology Data Exchange (ETDEWEB)

    Bae, Oh Keun; Choi, Yo Won; Kim, Kwon Hyung; Jeon, Seok Chol; Park, Choong Kee; Seo, Heung Suk; Hahm, Chang Kok [Hanyang Univ. College of Medicine, Seoul (Korea, Republic of)

    1997-02-01

    To evaluate the radiologic findings of acute intramural hematoma of the aorta, and the clinical follow up thereof. Among 34 cases confirmed clinically and radiologically as aortic dissection, and analysis was carried out based on 15 cases in which intramural hematoma without false lumen was demonstrated, on initial CT, 12 cases of in which follow up CT was used and five cases involving an aortogram. Elements such as the shape of the thickened aortic wall, ulcer-like intimal defects, and intimal calcification were examined. Changes in these elements were also examined on follow-up CT. DeBackey types 1 and 3 accounted for one and 14 cases, respectively. Initial precontrast CT demonstrated continuous, crescentic high attenuation areas along the wall of the descending aorta. In postcontrast scans, the crescentic areas were of relatively lower-attenuation and appeared along the aorta wall. Displaced intimal calcifications were seen in nine of fifteen patients. There was no intimal flap on all five aortogram, while aortic wall thickening and atherosclerotic change were demonstrated in four cases and in one case, respectively. Focal ulcers were seen in three cases. Ulcer-like intimal defects were demonstrated in a total of eleven cases (eight on CT, two on aortogram, and one on both). In ten of the twelve cases seen on follow up CT, the thickness of the intramural hematoma was seen to be reduced. Among the 15 cases, the operation was performed in two cases, and the remaining 13 received conservative treatment. In ten cases observed for more than twelve months, a recurrence of symptoms did not occur. Eccentric aortic wall thickening in patients who complain of acute chest pain is the result of acute aortic dissection with intramural hematoma, or a penetrating atherosclerotic ulcer of the aorta. The later may be differentiated from the former by the presence of on ulcer-like intimal defect. When both diseases are limited to the descending aorta, conservative treatment may

  15. Acute aortic intramural hematoma

    International Nuclear Information System (INIS)

    To evaluate the radiologic findings of acute intramural hematoma of the aorta, and the clinical follow up thereof. Among 34 cases confirmed clinically and radiologically as aortic dissection, and analysis was carried out based on 15 cases in which intramural hematoma without false lumen was demonstrated, on initial CT, 12 cases of in which follow up CT was used and five cases involving an aortogram. Elements such as the shape of the thickened aortic wall, ulcer-like intimal defects, and intimal calcification were examined. Changes in these elements were also examined on follow-up CT. DeBackey types 1 and 3 accounted for one and 14 cases, respectively. Initial precontrast CT demonstrated continuous, crescentic high attenuation areas along the wall of the descending aorta. In postcontrast scans, the crescentic areas were of relatively lower-attenuation and appeared along the aorta wall. Displaced intimal calcifications were seen in nine of fifteen patients. There was no intimal flap on all five aortogram, while aortic wall thickening and atherosclerotic change were demonstrated in four cases and in one case, respectively. Focal ulcers were seen in three cases. Ulcer-like intimal defects were demonstrated in a total of eleven cases (eight on CT, two on aortogram, and one on both). In ten of the twelve cases seen on follow up CT, the thickness of the intramural hematoma was seen to be reduced. Among the 15 cases, the operation was performed in two cases, and the remaining 13 received conservative treatment. In ten cases observed for more than twelve months, a recurrence of symptoms did not occur. Eccentric aortic wall thickening in patients who complain of acute chest pain is the result of acute aortic dissection with intramural hematoma, or a penetrating atherosclerotic ulcer of the aorta. The later may be differentiated from the former by the presence of on ulcer-like intimal defect. When both diseases are limited to the descending aorta, conservative treatment may

  16. A Mars 2011 Balloon Mission Trade Study

    Science.gov (United States)

    Smith, I.; Lew, T.; Perry, W.

    Mars Scouts are competitively selected PI-led missions to further Mars exploration in ways that satisfy NASA s overall objectives but are not currently in the planned line of missions The current 2006 Announcement of Opportunity AO for Mars Scouts has just closed The goal of this SwRI study was to develop a new balloon mission concept to where it could be credibly proposed for the AO The balloon system was defined in the study as consisting of two parts the balloon flight system BFS and the balloon deployment inflation system DIS The BFS includes the balloon envelope accessory hardware and gondola The balloon includes the envelope seams end fittings load core inflation tube diffusers payload tether shock attenuator and separation hardware The DIS includes the balloon container deployment hardware sequencer tankage gas and control hardware Trade studies were performed to better define the mission design space These studies included 1 effect of varied atmospheric thermal loads 2 effect of varying latitudes 3 effect of payload mass for varying altitudes 4 effect of radiative material properties on balloon size mass 5 effect of material areal densities on balloon size mass and 6 effect of inflation gas on system masses Results of the balloon trade study for the Mars 2011 mission opportunity will be presented

  17. PEBS - Positron Electron Balloon Spectrometer

    CERN Document Server

    Von Doetinchem, P; Kirn, T; Yearwood, G R; 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.

  18. Ross-Konno and Endocardial Fibroelastosis Resection After Hybrid Stage I Palliation in Infancy: Successful Staged Left-Ventricular Rehabilitation and Conversion to Biventricular Circulation After Fetal Diagnosis of Aortic Stenosis

    OpenAIRE

    Moon-Grady, Anita J.; Moore, Phillip; Azakie, Anthony

    2010-01-01

    We report a patient who presented during fetal life with severe aortic stenosis, left-ventricular dysfunction, and endocardial fibroelastosis (evolving hypoplastic left heart syndrome). Management involved in utero and postnatal balloon aortic valvuloplasty for partial relief of obstruction and early postnatal hybrid stage I palliation until recovery of left-ventricular systolic function had occurred. The infant subsequently had successful conversion to a biventricular circulation by combinin...

  19. Study on the dynamic change of endothelin and the effect of treatment by captopril in the development of stenosis of aorta after balloon injury in rabbits

    International Nuclear Information System (INIS)

    Objective: To study the dynamic change of endothelin (ET) in the blood, the pathological change, and the ET-IR (ET-immunoreaction, ET-IR) in the development of stenosis after balloon injury of rabbit aorta, and to investigate the effect of captopril on the prevention of restenosis after transluminal angioplasty. Methods: According to the different time of being killed after micro-balloon angioplasty, 48 rabbits were divided randomly into 6 groups such as 6-hour group, 1-day group, 3-day group, 7-day group, 15-day group, and 22-day group. 6 out of 8 rabbits of each group were created models of aortic endothelium injury by micro-balloon angioplasty, and 3 of them were given captopril (2 mg·kg-1·d-1 p. o.) from 1 day before balloon injury to the day being killed. The rest 2 rabbits in each group were controls. ET level in the plasma was measured by ELISA before, as well as after micro-balloon angioplasty, and pathomorphological examination of local aorta was carried out to observe the intimal thickness and the extent of lumen stenosis, and ET-IR was assessed by immunohistochemical technique in the aortic wall. Results: (1) The major change of vascular stenosis was the proliferation of vascular smooth muscle cell (VSMC) and endothelium. (2) ET levels in the plasma and ET-IR in the local aortic wall were significantly increased after micro-balloon angioplasty. (3) The intimal thickness and extent of lumen stenosis in the group of medical treatment by captopril were significantly lower than those in injury group. Conclusions: The experimental results show that the major pathologic change of vascular stenosis is the significant proliferation of VSMC and endothelium. Further more, ET is a key factor in the development of vascular stenosis, and captopril can prevent restenosis after angioplasty. (author)

  20. Centrifugal pumps

    CERN Document Server

    Anderson, HH

    1981-01-01

    Centrifugal Pumps describes the whole range of the centrifugal pump (mixed flow and axial flow pumps are dealt with more briefly), with emphasis on the development of the boiler feed pump. Organized into 46 chapters, this book discusses the general hydrodynamic principles, performance, dimensions, type number, flow, and efficiency of centrifugal pumps. This text also explains the pumps performance; entry conditions and cavitation; speed and dimensions for a given duty; and losses. Some chapters further describe centrifugal pump mechanical design, installation, monitoring, and maintenance. The

  1. Hemi-Fontan or Bidirectional Cavopulmonary Shunt for Right Ventricular Failure after Mitral Valve Replacement and Acute Ascending Aortic Dissection: Report of Two Cases

    Directory of Open Access Journals (Sweden)

    Hassan Teimouri

    2015-10-01

    Full Text Available Right ventricular failure due to right coronary artery disease, right ventricular hypertrophy, stunning, abnormal septal motion, myocardial infarction, or non-homogeneous distribution of cardioplegia is an uncommon but serious complication of open heart surgery. We report a patient with severe right ventricular hypertrophy secondary to severe mitral valve stenosis and another patient with detachment of the right coronary artery due to the dissection of the ascending aorta. The patients developed right ventricular failure, which persisted after surgery and rendered weaning from cardiopulmonary bypass unsuccessful. Through a hemi-Fontan, or bidirectional cavopulmonary shunt, and an intra-aortic balloon pump, the patients were successfully weaned from cardiopulmonary bypass. This shunt may be an alternative to a right ventricular assist device in some patients with right ventricular failure. The long-term outcome and the indication of bi-directional cavopulmonary shunt has not been confirmed, although it is believed to be effective for saving the life of patients with low cardiac output and acute right ventricular failure. In our cases, six months following the operation, there was some degree of recovery of the right ventricular function. In long-term follow-up, however, it would be interesting for the authors to know if the improved right ventricular function, with better antegrade pulsatile flow in the pulmonary artery, in any way interferes with the functioning of the bidirectional cavopulmonary shunt.

  2. Tobacco smoking and aortic aneurysm

    DEFF Research Database (Denmark)

    Sode, Birgitte F; Nordestgaard, Børge G; Grønbæk, Morten;

    2012-01-01

    from the Copenhagen City Heart Study followed for up to 34years and in 56,211 individuals from the Copenhagen General Population Study followed for up to 7years. RESULTS: During follow-up, 335 and 169 individuals developed aortic aneurysm outcomes in the Copenhagen City Heart Study and Copenhagen...... General Population Study, respectively. According to the magnitude of the hazard ratios, tobacco consumption was the most important risk factor for hospitalization and death from aortic aneurysm, followed by male sex and hypertension in both cohorts. The population attributable risk of aortic aneurysm...... outcomes due to tobacco consumption was 64% and 47% in the Copenhagen City Heart Study and Copenhagen General Population Study, respectively, and ranked highest among population attributable risks of aortic aneurysm in both cohorts. The absolute 10-year risk for hospitalization or death from aortic...

  3. Hyperspectral Polarimeter for Monitoring Balloon Strain Project

    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...

  4. Unusual Case of Overt Aortic Dissection Mimicking Aortic Intramural Hematoma.

    Science.gov (United States)

    Disha, Kushtrim; Kuntze, Thomas; Girdauskas, Evaldas

    2016-04-01

    We report an interesting case in which overt aortic dissection mimicked two episodes of aortic intramural hematoma (IMH) (Stanford A, DeBakey I). This took place over the course of four days and had a major influence on the surgical treatment strategy. The first episode of IMH regressed completely within 15 hours after it was clinically diagnosed and verified using imaging techniques. The recurrence of IMH was detected three days thereafter, resulting in an urgent surgical intervention. Overt aortic dissection with evidence of an intimal tear was diagnosed intraoperatively. PMID:27066437

  5. Reinforced aortic root reconstruction for acute type A aortic dissection involving the aortic root

    Directory of Open Access Journals (Sweden)

    Han Qing-qi

    2013-06-01

    Full Text Available OBJECTIVE: There are debates regarding the optimal approach for AAAD involving the aortic root. We described a modified reinforced aortic root reconstruction approach for treating AAAD involving the aortic root. METHODS: A total of 161 patients with AAAD involving the aortic root were treated by our modified reinforced aortic root reconstruction approach from January 1998 to December 2008. Key features of our modified approach were placement of an autologous pericardial patch in the false lumen, lining of the sinotubular junction lumen with a polyester vascular ring, and wrapping of the vessel with Teflon strips. Outcome measures included post-operative mortality, survival, complications, and level of aortic regurgitation. RESULTS: A total of 161 patients were included in the study (mean age: 43.3 1 15.5 years. The mean duration of follow-up was 5.1 1 2.96 years (2-12 years. A total of 10 (6.2% and 11 (6.8% patients died during hospitalization and during follow-up, respectively. Thirty-one (19.3% patients experienced postoperative complications. The 1-, 3-, 5-, and 10-year survival rates were 99.3%, 98%, 93.8%, and 75.5%, respectively. There were no instances of recurrent aortic dissection, aortic aneurysm, or pseudoaneurysm during the entire study period. The severity of aortic regurgitation dramatically decreased immediately after surgery (from 28.6% to 0% grade 3-4 and thereafter slightly increased (from 0% to 7.2% at 5 years and 9.1% at 10 years. CONCLUSION: This modified reinforced aortic root reconstruction was feasible, safe and durable/effective, as indicated by its low mortality, low postoperative complications and high survival rate.

  6. 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.

  7. Balloon dilatations of esophageal strictures

    International Nuclear Information System (INIS)

    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

  8. Simulation of stratospheric balloon environment

    International Nuclear Information System (INIS)

    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

  9. Early Cosmic Ray Research with Balloons

    International Nuclear Information System (INIS)

    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

  10. Balloon Occlusion of the Contralateral Iliac Artery to Assist Recanalization of the Ipsilateral Iliac Artery in Total Aortoiliac Occlusion: A Technical Note

    OpenAIRE

    Abdel Aziz A. Jaffan

    2013-01-01

    Endovascular recanalization of chronic total aortoiliac occlusion is technically challenging. Inability to reenter the true aortic lumen, following retrograde iliac recanalization, is one of the most common causes of failure. We describe a case of a total aortoiliac occlusion where balloon occlusion of the right common iliac artery, following its recanalization from a brachial approach, was used to facilitate antegrade recanalization of the occluded contralateral left common iliac artery.

  11. Heat pumps

    CERN Document Server

    Macmichael, DBA

    1988-01-01

    A fully revised and extended account of the design, manufacture and use of heat pumps in both industrial and domestic applications. Topics covered include a detailed description of the various heat pump cycles, the components of a heat pump system - drive, compressor, heat exchangers etc., and the more practical considerations to be taken into account in their selection.

  12. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... see we've used the cautery to achieve access to the sternum. On the left hand side ... wound, which allows us to get more ready access to the aorta and the aortic valve. The ...

  13. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... to requiring surgery for aortic stenosis, left ventricular hypertrophy is a common manifestation. By that, I mean generally speaking any muscle that works harder in the body gets thicker ...

  14. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... symptoms and ultimately surgery may be in the future. The symptoms seen primarily with aortic stenosis at ... echocardiography is? Echocardiography is the use of ultrasound technology. Ultrasound technology is a form of the same ...

  15. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... thank you, Jim. This is obviously just a model of the heart just to give some perspective ... aortic repair, he would have had a cardiac evaluation prior to that and they probably would have ...

  16. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... for patients who would not tolerate well a traditional open operation or a less invasive operation, as ... physical reserve. So Barbara Bush recently had a traditional aortic valve replacement surgery. What makes a patient ...

  17. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... in severe aortic stenosis, as it's probably more stress than the patient's heart should have to undergo. ... There's been a lot of work done by academic cardiac surgeons and cardiologists to try to define ...

  18. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... other cardiovascular diseases including heart attack and increased risk of cardiovascular death. John, is there anything you ... with time. This highlights the mortality or the risk of death associated with aortic valve replacement and ...

  19. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... aortic stenosis and even tricuspid stenosis from rheumatic causes are much more common. To expand upon that ... out of the bloodstream and is thought to cause less untoward effects to the brain and other ...

  20. Minimally invasive aortic valve replacement

    DEFF Research Database (Denmark)

    Foghsgaard, Signe; Schmidt, Thomas Andersen; Kjaergard, Henrik K

    2009-01-01

    . The 30-day mortality rate for the 98 patients was zero, although 14 of the 98 mini-sternotomies had to be converted to complete sternotomies intraoperatively due to technical problems. Such conversion doubled the operative time over that of the planned full sternotomies. In the group of patients whose......In this descriptive prospective study, we evaluate the outcomes of surgery in 98 patients who were scheduled to undergo minimally invasive aortic valve replacement. These patients were compared with a group of 50 patients who underwent scheduled aortic valve replacement through a full sternotomy...... operations were completed as mini-sternotomies, 4 died later of noncardiac causes. The aortic cross-clamp and perfusion times were significantly different across all groups (P < 0.001), with the intended full-sternotomy group having the shortest times. In conclusion, the mini-aortic valve replacement is an...

  1. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... more likely we see aortic stenosis. Again, patient education is part of the evaluation and management of ... for patients who would not tolerate well a traditional open operation or a less invasive operation, as ...

  2. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... more likely we see aortic stenosis. Again, patient education is part of the evaluation and management of ... likely than patients who don't have other cardiovascular conditions: coronary artery disease, peripheral vascular disease, et ...

  3. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... in severe aortic stenosis, as it's probably more stress than the patient's heart should have to undergo. ... these series, when you critically look at the literature, the operative times can be significantly longer and ...

  4. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... to minimize their symptoms, but that doesn't impact the course of the disease itself. When I' ... more likely we see aortic stenosis. Again, patient education is part of the evaluation and management of ...

  5. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... starts out as a disease we call aortic sclerosis, which is the beginning of the process of ... path life. Again, it's a progressive disease from sclerosis, or the beginning of thickening of the valve, ...

  6. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... thank you, Jim. This is obviously just a model of the heart just to give some perspective ... the aorta at this point. 9 Earlier this month Robin Williams had his aortic valve replaced and ...

  7. Transcatheter Aortic Heart Valve Thrombosis

    DEFF Research Database (Denmark)

    Hansson, Nicolaj C; Grove, Erik L; Andersen, Henning R;

    2016-01-01

    BACKGROUND: There is increasing focus on transcatheter heart valve (THV) thrombosis. However, there are limited data on incidence, clinical implications and predisposing factors of THV thrombosis following transcatheter aortic valve replacement (TAVR). OBJECTIVES: We assessed the incidence...

  8. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... somebody for this operation. Again, there's no medical therapy that has been proven to slow or reverse ... to their physician. This may lead to earlier treatment and better outcomes as well. Aortic stenosis, as ...

  9. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... more likely we see aortic stenosis. Again, patient education is part of the evaluation and management of ... surgery we, as surgeons, know from our anatomy training during our course of training, we know where ...

  10. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... John, is there anything you can do to help prevent aortic stenosis? There's no prophylactic methods that ... very good looks. It's a great tool to help cardiac surgeons. Thanks, Jim. And I would underscore ...

  11. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... able to look at the aortic valve very well. In fact, transesophageal echocardiography is the best modality ... use to help evaluate both cardiac function as well as anatomy in patients who need heart surgery. ...

  12. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... a series of charts that we have, historical data, to know really what the best size is ... heart and lung circulation, so that we can open the aorta safely and replace this patient's aortic ...

  13. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... in severe aortic stenosis, as it's probably more stress than the patient's heart should have to undergo. ... in younger patients who want to return to work and activity more quickly, we feel that this ...

  14. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... uncommon to have more problems with their tissue quality and so we do have to be careful ... does not have an aortic aneurysm in the first part of their aorta there, their ascending aorta. ...

  15. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... No medications as such have been proven to slow that disease path life. Again, it's a progressive ... no medical therapy that has been proven to slow or reverse the process of aortic stenosis. Clearly, ...

  16. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... This process starts out as a disease we call aortic sclerosis, which is the beginning of the ... either tissues from cows or pigs, what we call porcine for pigs and bovine for cows. Essentially, ...

  17. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... including heart attack and increased risk of cardiovascular death. John, is there anything you can do to ... aortic stenosis, there's a pretty rapid progression into death if no intervention is taken. We feel that ...

  18. Heat pumps

    CERN Document Server

    Brodowicz, Kazimierz; Wyszynski, M L; Wyszynski

    2013-01-01

    Heat pumps and related technology are in widespread use in industrial processes and installations. This book presents a unified, comprehensive and systematic treatment of the design and operation of both compression and sorption heat pumps. Heat pump thermodynamics, the choice of working fluid and the characteristics of low temperature heat sources and their application to heat pumps are covered in detail.Economic aspects are discussed and the extensive use of the exergy concept in evaluating performance of heat pumps is a unique feature of the book. The thermodynamic and chemical properties o

  19. Esophageal achalasia : results of balloon dilation

    International Nuclear Information System (INIS)

    To evaluate the clinical effectiveness of fluoroscopically guided balloon dilation in the treatment of esophageal achalasia. Under fluoroscopic guidance, 21 balloon dilation procedures were performed in 14 patients with achalasia. A balloon with a diameter of 20 mm was used for the initial attempt.If the patient tolerated this well, the procedure was repeated with a 10-20 mm balloon, placed alongside at the same session. If, however the patient complained of severe chest pain and/or a postprocedural esophagogram showed an improvement,the additional balloon was not used. For patients whose results were unsatisfactory, the dilation procedure was repeated at sessions three to seven days apart. Succesful dilation was achieved in 13 of 14 patients(92.9%), who needed a total of 20 sessions of balloon dilation, ranging from one to three sessions per patient(mean, 1.54 sessions). Esophageal rupture occured in one of 14 patients(7.1%) ; of the 13 patients who underwent a successful dilation procedure, 12(92.3%) were free of recurrent symptoms during the follow-up period of 1-56(mean, 18.5) months. The remaning patient(7.7%) had a recurrence seven months after dilation. Fluoroscopically guided balloon dilation seems to be safe and effective in the treatment of esophageal achalasia

  20. Esophageal achalasia : results of balloon dilation

    Energy Technology Data Exchange (ETDEWEB)

    Ki, Won Woo; Kang, Sung Gwon; Yoon, Kwon Ha; Kim, Nam Hyeon; Lee, Hyo Jeong; Yoon, Hyun Ki; Sung, Kyu Bo; Song, Ho Young [Ulsan Univ. College of Medicine, Seoul (Korea, Republic of)

    1996-08-01

    To evaluate the clinical effectiveness of fluoroscopically guided balloon dilation in the treatment of esophageal achalasia. Under fluoroscopic guidance, 21 balloon dilation procedures were performed in 14 patients with achalasia. A balloon with a diameter of 20 mm was used for the initial attempt.If the patient tolerated this well, the procedure was repeated with a 10-20 mm balloon, placed alongside at the same session. If, however the patient complained of severe chest pain and/or a postprocedural esophagogram showed an improvement,the additional balloon was not used. For patients whose results were unsatisfactory, the dilation procedure was repeated at sessions three to seven days apart. Succesful dilation was achieved in 13 of 14 patients(92.9%), who needed a total of 20 sessions of balloon dilation, ranging from one to three sessions per patient(mean, 1.54 sessions). Esophageal rupture occured in one of 14 patients(7.1%) ; of the 13 patients who underwent a successful dilation procedure, 12(92.3%) were free of recurrent symptoms during the follow-up period of 1-56(mean, 18.5) months. The remaning patient(7.7%) had a recurrence seven months after dilation. Fluoroscopically guided balloon dilation seems to be safe and effective in the treatment of esophageal achalasia.

  1. Airborne Internet Providing Tethered Balloon System

    Directory of Open Access Journals (Sweden)

    Suvriti Dhawan1

    2015-12-01

    Full Text Available In this paper we shall introduce a new system for providing wireless network communication over a specified area using ’lighter than air’ balloons. This technology will replace the existing fiber optic network system. This will be done by using a tethered balloon along with the payload (containing a receiver, a transmitter and a radio communication device.This payload will be suspended from the ground at an altitude (depending on the area of coverage required. Users under this area will be able to access this system directly for internet connectivity. This system can be used over large areas like universities, companies and societies to provide internet facility to their users through Wi-Fi or over an area where the user is specified (commercial purposes. Currently Google is working on similar idea called the ’Google Loon’ in which they use high altitude balloons which float at an altitude twice as high as air planes and the weather. They recently tested this system over New-Zealand by providing internet to their pilot testers on ground. Their balloons not being stationary, move with directional winds and have to be replaced one after the other to maintain consistency. This can be a huge problem over the areas where upper atmospheric winds are not in favorable direction. We can resolve this problem by using our stationary tethered balloon system which can communicate with the loon balloons to provide internet facility over a desired area. Moreover when our balloon will communicate with the loon balloon it will increase the coverage area as the loon balloon has to communicate to a point which is above the ground. Our system will not only replace the existing fiber optic system but it will also be selfsustaining i.e. It will generate its own power using solar panels.

  2. Investigating Diffusion and Entropy with Carbon Dioxide-Filled Balloons

    Science.gov (United States)

    Jadrich, James; Bruxvoort, Crystal

    2010-01-01

    Fill an ordinary latex balloon with helium gas and you know what to expect. Over the next day or two the volume will decrease noticeably as helium escapes from the balloon. So what happens when a latex balloon is filled with carbon dioxide gas? Surprisingly, carbon dioxide balloons deflate at rates as much as an order of magnitude faster than…

  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. [Early Detection of Iliac Artery Rupture by Sudden Steep Reduction of Regional Saturation of Oxygen at the Ipsilateral Foot during Transcatheter Aortic Valve Implantation--A Case Report].

    Science.gov (United States)

    Saito, Shun; Ishii, Hisanari

    2016-02-01

    An 80-year-old woman with severe aortic stenosis was planned to undergo transcatheter aortic valve implantation (TAVI) under general anesthesia. Due to severe stenosis of the femoral arteries, the left iliac artery was cut down and a 16 F Edwards SAPIEN Expandable Sheath (eSheath : Edwards Lifesciences, Irvine, CA) was inserted into the artery smoothly. After balloon aortic valvuloplasty (BAV), an artificial valve was tried to deploy but stuck in the middle of eSheath. Suddenly regional saturation of oxygen (rSO2) at the ipsilateral foot decreased steeply without other significant hemodynamic instabilities. At insertion site of eSheath, the left external iliac artery rupture occurred. To our surprise, there was almost no major bleeding because of the artery spasm and suppression of the large bore sheath. eSheath and the stuck valve were taken out together and TAVI was discontinued. The artery was replaced with a graft, and rSO2 of the foot recovered. Her aortic stenosis improved to moderate by balloon aortic valvuloplasty (BAV) according to transthoracic echocardiography. The patient was discharged on foot without complications. To our knowledge, this is a first report of a silent rupture of the iliac artery during TAVI to be detected by sudden decrease of the foot rSO2 and treated with no fatal events. PMID:27017778

  5. The murine angiotensin II-induced abdominal aortic aneurysm model: rupture risk and inflammatory progression patterns

    Directory of Open Access Journals (Sweden)

    Richard Y Cao

    2010-07-01

    Full Text Available An abdominal aortic aneurysm (AAA is an enlargement of the greatest artery in the body defined as an increase in diameter of 1.5-fold. AAAs are common in the elderly population and thousands die each year from their complications. The most commonly used mouse model to study the pathogenesis of AAA is the angiotensin II (Ang II infusion method delivered via osmotic mini-pump for 28 days. Here, we studied the site-specificity and onset of aortic rupture, characterized three-dimensional (3D images and flow patterns in developing AAAs by ultrasound imaging, and examined macrophage infiltration in the Ang II model using 65 apolipoprotein E deficient mice. Aortic rupture occurred in 16 mice (25 % and was nearly as prevalent at the aortic arch (44 % as it was in the suprarenal region (56 % and was most common within the first seven days after Ang II infusion (12 of 16; 75 %. Longitudinal ultrasound screening was found to correlate nicely with histological analysis and AAA volume renderings showed a significant relationship with AAA severity index. Aortic dissection preceded altered flow patterns and macrophage infiltration was a prominent characteristic of developing AAAs. Targeting the inflammatory component of AAA disease with novel therapeutics will hopefully lead to new strategies to attenuate aneurysm growth and aortic rupture.

  6. The balloon and the airship technological heritage

    Science.gov (United States)

    Mayer, N. J.

    1981-01-01

    The balloon and the airship are discussed with emphasis on the identification of commonalities and distinctions. The aerostat technology behind the shape and structure of the vehicles is reviewed, including a discussion of structural weight, internal pressure, buckling, and the development of a stable tethered balloon system. Proper materials for the envelope are considered, taking elongation and stress into account, and flight operation and future developments are reviewed. Airships and tethered balloons which are designed to carry high operating pressure with low gas loss characteristics are found to share similar problems in low speed flight operations, while possessing interchangeable technologies.

  7. 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 ...

  8. Cutting Balloon angioplasty for cardiac transplant vasculopathy.

    OpenAIRE

    Takano, Y.; Currier, JW; Yeatman, LA; Kobashigawa, JA; Rogers, AD; Cianfichi, LJ; Fishbein, MC; Tobis, JM

    2002-01-01

    We performed Cutting Balloon angioplasty on 20 lesions in 11 heart transplant recipients 7.5 +/- 3.8 years after transplantation. The mean percentage of diameter stenosis decreased from 88.3% +/- 13.8% to 19.6% +/- 13.7% after Cutting Balloon angioplasty without complication. Seven patients underwent follow-up angiography at 4.9 +/- 1.7 months in a total of 12 lesions, and all lesions showed restenosis with a mean diameter stenosis of 84.4% +/- 19.2%. Cutting Balloon angioplasty can be used t...

  9. Bovine aortic arch: A novel association with thoracic aortic dilation

    International Nuclear Information System (INIS)

    Aim: To investigate whether there is a link between bovine arch and thoracic aortic aneurysm. Materials and methods: Computed tomography (CT) and magnetic resonance imaging (MRI) images of the thorax of 191 patients with dilated thoracic aortas and 391 consecutive, unselected patients as controls were retrospectively reviewed. Bovine arch was considered present if either a shared origin of the left common carotid and innominate arteries or an origin of the left common carotid from the innominate artery was identified. A chi-square test was used to evaluate the significance of differences between subgroups. Results: A trend towards increased prevalence of bovine arch was seen in patients with dilated aortas (26.2%) compared to controls (20.5%, p = 0.12). The association was statistically significant in patients over 70 years old (31.9%, p = 0.019) and when dilation involved the aortic arch (47.6%, p = 0.003). Conclusions: An association between bovine arch and aortic dilation is seen in older patients, and when dilation involves the aortic arch. Bovine arch should be considered a potential risk factor for thoracic aortic aneurysm.

  10. Acute aortic valve prolapse in Marfan's syndrome.

    OpenAIRE

    Carr, N J; Cullen, S. A.

    1991-01-01

    A 22 year old man with Marfan's syndrome died suddenly following acute aortic valve prolapse. Although aortic root involvement in Marfan's syndrome is common, we have found no previous description of this particular complication in the literature.

  11. Pumping life

    DEFF Research Database (Denmark)

    Sitsel, Oleg; Dach, Ingrid; Hoffmann, Robert Daniel

    2012-01-01

    The name PUMPKIN may suggest a research centre focused on American Halloween traditions or the investigation of the growth of vegetables – however this would be misleading. Researchers at PUMPKIN, short for Centre for Membrane Pumps in Cells and Disease, are in fact interested in a large family of...... membrane proteins: P-type ATPase pumps. This article takes the reader on a tour from Aarhus to Copenhagen, from bacteria to plants and humans, and from ions over protein structures to diseases caused by malfunctioning pump proteins. The magazine Nature once titled work published from PUMPKIN ‘Pumping ions......’. Here we illustrate that the pumping of ions means nothing less than the pumping of life....

  12. Centrifugal pumps

    CERN Document Server

    Gülich, Johann Friedrich

    2014-01-01

    This book gives an unparalleled, up-to-date, in-depth treatment of all kinds of flow phenomena encountered in centrifugal pumps including the complex interactions of fluid flow with vibrations and wear of materials. The scope includes all aspects of hydraulic design, 3D-flow phenomena and partload operation, cavitation, numerical flow calculations, hydraulic forces, pressure pulsations, noise, pump vibrations (notably bearing housing vibration diagnostics and remedies), pipe vibrations, pump characteristics and pump operation, design of intake structures, the effects of highly viscous flows, pumping of gas-liquid mixtures, hydraulic transport of solids, fatigue damage to impellers or diffusers, material selection under the aspects of fatigue, corrosion, erosion-corrosion or hydro-abrasive wear, pump selection, and hydraulic quality criteria. As a novelty, the 3rd ed. brings a fully analytical design method for radial impellers, which eliminates the arbitrary choices inherent to former design procedures. The d...

  13. Feasibility of transapical aortic valve replacement through a left ventricular apical diverticulum

    Directory of Open Access Journals (Sweden)

    Ferrari Enrico

    2013-01-01

    Full Text Available Abstract Transapical aortic valve replacement is an established technique performed in high-risk patients with symptomatic aortic valve stenosis and vascular disease contraindicating trans-vascular and trans-aortic procedures. The presence of a left ventricular apical diverticulum is a rare event and the treatment depends on dimensions and estimated risk of embolisation, rupture, or onset of ventricular arrhythmias. The diagnosis is based on standard cardiac imaging and symptoms are very rare. In this case report we illustrate our experience with a 81 years old female patient suffering from symptomatic aortic valve stenosis, respiratory disease, chronic renal failure and severe peripheral vascular disease (logistic euroscore: 42%, who successfully underwent a transapical 23 mm balloon-expandable stent-valve implantation through an apical diverticulum of the left ventricle. Intra-luminal thrombi were absent and during the same procedure were able to treat the valve disease and to successfully exclude the apical diverticulum without complications and through a mini thoracotomy. To the best of our knowledge, this is the first time that a transapical procedure is successfully performed through an apical diverticulum.

  14. The Murine Angiotensin II-Induced Abdominal Aortic Aneurysm Model: Rupture Risk and Inflammatory Progression Patterns

    OpenAIRE

    TimothySt. Amand

    2010-01-01

    An abdominal aortic aneurysm (AAA) is an enlargement of the greatest artery in the body defined as an increase in diameter of 1.5-fold. AAAs are common in the elderly population and thousands die each year from their complications. The most commonly used mouse model to study the pathogenesis of AAA is the angiotensin II (Ang II) infusion method delivered via osmotic mini-pump for 28 days. Here, we studied the site-specificity and onset of aortic rupture, characterized three-dimensional (3D) i...

  15. 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.

  16. Aortic valve replacement through right thoracotomy.

    OpenAIRE

    Rao, P N; A S Kumar

    1993-01-01

    There has never, to our knowledge, been a report of aortic valve replacement via a right thoracotomy. However, we recently used this approach in 2 young women with severe aortic stenosis. Exposure of the aortic valve was excellent, and we encountered neither technical difficulties nor sequelae related to the right thoracotomy. We believe that right thoracotomy provides adequate access for safe aortic valve replacement and yields cosmetically more appealing results than does median sternotomy.

  17. ABDOMINAL AORTIC ANEURYSM (AAA

    Directory of Open Access Journals (Sweden)

    Rajesh G

    2011-11-01

    Full Text Available AAA is defined as a distension of the infrarenal aorta by more than 50% (or 1.5 times compared with a corresponding healthy, aged and gender matched population. AAA afflicts 1 to 6 % of the general population aged more than 60 years and the incidence rises by approximately 0.15% annually. When the definition of a maximum external diameter ≥3 cm is used, the prevalence of AAA is upto 6 times greater in men than in women. AAAs are much more common than thoracic aortic aneurysms. Most common cause of AAA is atherosclerosis (95%. Less common causes include infectious or inflammatory origin or those associated with connective tissue disorders. Process of AAA formation is multifactorial. Other than the general risk factors for atherosclerosis, genetic predispo s iti on, aut o immunity and hemodynamic factors all play roles in its formation. AAA is 1.5 times more frequent in hypert ensive patients. Smokers have 8 times risk for developing AAA. The existence of familial aggre gation of AAA implicates genetic factors in the etiology of AAA. Women with AAA are more likely to have a positive family history of this disorder. Those with a family history of AAA have an increased risk of 30%, and their aneurysms tend to occur at a younger age and carry a greater risk of rupture than do sporadic aneurysms.

  18. Resolution of an Acute Aortic Syndrome with Aortic Valve Insufficiency Post-PCI

    OpenAIRE

    de Barros e Silva, Pedro G.M.; Aquino, Thiago de; Resende, Marcos V.; Richter, Ivo; Barros, Cecilia M.; Andrioli, Vanessa G.; Baruzzi, Antonio C.; Medeiros, Caio C.J.; Furlan, Valter

    2014-01-01

    Patient: Female, 52 Final Diagnosis: Acute aortic syndrome with aortic valve insufficiency post-PCI Symptoms: Chest pain Medication: — Clinical Procedure: Conservative Specialty: Cardiology Objective: Unusual or unexpected effect of treatment Background: Acute aortic syndrome is the modern term that includes aortic dissection, intramural hematoma, and symptomatic aortic ulcer. Iatrogenic coronary artery dissection extending to the aorta during percutaneous coronary intervention is a very rare...

  19. 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....

  20. Retrieving Balloon Data in Flight Project

    Data.gov (United States)

    National Aeronautics and Space Administration —   NASA has plans to fly stratospheric ULDBs for missions of 100 days or more in the next few years. As these balloons circumnavigate the globe multiple...

  1. Attitude determination for balloon-borne experiments

    CERN Document Server

    Gandilo, N N; Amiri, M; Angile, F E; Benton, S J; Bock, J J; Bond, J R; Bryan, S A; Chiang, H C; Contaldi, C R; Crill, B P; Devlin, M J; Dober, B; Dore, O P; Farhang, M; Filippini, J P; Fissel, L M; Fraisse, A A; Fukui, Y; Galitzki, N; Gambrel, A E; Golwala, S; Gudmundsson, J E; Halpern, M; Hasselfield, M; Hilton, G C; Holmes, W A; Hristov, V V; Irwin, K D; Jones, W C; Kermish, Z D; Klein, J; Korotkov, A L; Kuo, C L; MacTavish, C J; Mason, P V; Matthews, T G; Megerian, K G; Moncelsi, L; Morford, T A; Mroczkowski, T K; Nagy, J M; Netterfield, C B; Novak, G; Nutter, D; O'Brient, R; Pascale, E; Poidevin, F; Rahlin, A S; Reintsema, C D; Ruhl, J E; Runyan, M C; Savini, G; Scott, D; Shariff, J A; Soler, J D; Thomas, N E; Trangsrud, A; Truch, M D; Tucker, C E; Tucker, G S; Tucker, R S; Turner, A D; Ward-Thompson, D; Weber, A C; Wiebe, D V; Young, E Y

    2014-01-01

    An attitude determination system for balloon-borne experiments is presented. The system provides pointing information in azimuth and elevation for instruments flying on stratospheric balloons over Antarctica. In-flight attitude is given by the real-time combination of readings from star cameras, a magnetometer, sun sensors, GPS, gyroscopes, tilt sensors and an elevation encoder. Post-flight attitude reconstruction is determined from star camera solutions, interpolated by the gyroscopes using an extended Kalman Filter. The multi-sensor system was employed by the Balloon-borne Large Aperture Submillimeter Telescope for Polarimetry (BLASTPol), an experiment that measures polarized thermal emission from interstellar dust clouds. A similar system was designed for the upcoming flight of SPIDER, a Cosmic Microwave Background polarization experiment. The pointing requirements for these experiments are discussed, as well as the challenges in designing attitude reconstruction systems for high altitude balloon flights. ...

  2. Percutaneous transvenous balloon occlusion of arteriovenous fistula

    International Nuclear Information System (INIS)

    The closure of arteriovenous fistulas, using a balloon catheter introduced through the vein draining the fistula, is discussed. The application of this method to the closure of an iatrogenic vertebrovertebral fistula is described. (orig.)

  3. 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...

  4. Stroke in Patients With Aortic Stenosis

    DEFF Research Database (Denmark)

    Greve, Anders Møller; Dalsgaard, Morten; Bang, Casper N;

    2014-01-01

    BACKGROUND AND PURPOSE: There are limited data on risk stratification of stroke in aortic stenosis. This study examined predictors of stroke in aortic stenosis, the prognostic implications of stroke, and how aortic valve replacement (AVR) with or without concomitant coronary artery bypass graftin...... associated with mortality. CLINICAL TRIAL REGISTRATION URL: http://www.clinicaltrials.gov. Unique identifier: NCT00092677....

  5. Persistent Fifth Aortic Arch with Coarctation

    Science.gov (United States)

    Kim, Sue Hyun; Choi, Eun-Suk; Cho, Sungkyu; Kim, Woong-Han

    2016-01-01

    Persistent fifth aortic arch (PFAA) is a rare congenital anomaly of the aortic arch frequently associated with other cardiovascular anomalies, such as tetralogy of Fallot and aortic arch coarctation or interruption. We report the case of a neonate with PFAA with coarctation who successfully underwent surgical repair. PMID:26889445

  6. Test ventilation with smoke, bubbles, and balloons

    Energy Technology Data Exchange (ETDEWEB)

    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.

  7. [MINIMALLY INVASIVE AORTIC VALVE REPLACEMENT].

    Science.gov (United States)

    Tabata, Minoru

    2016-03-01

    Minimally invasive aortic valve replacement (MIAVR) is defined as aortic valve replacement avoiding full sternotomy. Common approaches include a partial sternotomy right thoracotomy, and a parasternal approach. MIAVR has been shown to have advantages over conventional AVR such as shorter length of stay and smaller amount of blood transfusion and better cosmesis. However, it is also known to have disadvantages such as longer cardiopulmonary bypass and aortic cross-clamp times and potential complications related to peripheral cannulation. Appropriate patient selection is very important. Since the procedure is more complex than conventional AVR, more intensive teamwork in the operating room is essential. Additionally, a team approach during postoperative management is critical to maximize the benefits of MIAVR. PMID:27295772

  8. 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

  9. Aortic Impedance in Little Mice

    OpenAIRE

    Reddy, Anilkumar K.; Taffet, George E.; Hartley, Craig J.

    2008-01-01

    The Little dwarf mouse lives 30% longer than its age-matched wild-type (WT) mouse. We determined aortic input impedance in 21 (8 Little, 13 WT) 4 month-old mice. Modulus of impedance was calculated from the Fourier transformed aortic pressure (P) and average luminal flow velocity (Vavg) as ∣Zi∣ = ∣P∣/∣Vavg∣. Characteristic impedance was estimated by averaging the 2nd-10th harmonic of the impedance moduli. We found the impedance modulus ∣Zi∣ to be similar in the 2 groups (WT vs. Little; mean±S...

  10. Initial Acute Animal Experiment Using a New Miniature Axial Flow Pump in Series With the Natural Heart.

    Science.gov (United States)

    Okamoto, Eiji; Yano, Tetsuya; Shiraishi, Yasuyuki; Miura, Hidekazu; Yambe, Tomoyuki; Mitamura, Yoshinori

    2015-08-01

    We have advocated an axial flow blood pump called "valvo pump" that is implanted at the aortic valve position, and we have developed axial flow blood pumps to realize the concept of the valvo pump. The latest model of the axial flow blood pump mainly consists of a stator, a directly driven impeller, and a hydrodynamic bearing. The axial flow blood pump has a diameter of 33 mm and length of 74 mm, and the length of anatomical occupation is 33 mm. The axial flow blood pump is anastomosed to the aorta with polytetrafluoroethylene (PTFE) cuffs worn on the inflow and outflow ports. Dp-Q curves of the axial flow blood pump are flatter than those of ordinary axial flow pumps, and pump outflow of 5 L/min was obtained against a pressure difference of 50 mm Hg at a rotational speed of 9000 rpm in vitro. The axial flow blood pump was installed in a goat by anastomosing with the thoracic descending aorta using PTFE cuffs, and it was rotated at a rotational speed of 8000 rpm. Unlike in case of the ventricular assistance in parallel with the natural heart, pulsatilities of aortic pressure and aortic flow were preserved even when the pump was on, and mean aortic flow was increased by 1.5 L/min with increase in mean aortic pressure of 30 mm Hg. In conclusion, circulatory assistance in series with the natural heart using the axial flow blood pump was able to improve hemodynamic pulsatility, and it would contribute to improvement of end-organ circulation. . PMID:26234449

  11. Treatment of an Aortic Traumatic Double Rupture

    Directory of Open Access Journals (Sweden)

    Attinà Domenico

    2015-03-01

    Full Text Available Traumatic thoracic aortic rupture is a life-threatening condition; aortic isthmus is the most common site of rupture, but in rare cases traumatic injury can localize elsewhere, such as at aortic arch or at the level of the diaphragm. In the past few years, endovascular treatment of traumatic aortic injury became a safe procedure, with lower mortality and complication, if compared with open surgery. We report a case of a 40-year-old-man admitted to emergency department after a violent car crash in which an aortic traumatic double rupture was successfully treated with two endovascular stent-grafts coverage.

  12. Hydatid cyst involving the aortic arch.

    Science.gov (United States)

    Apaydin, Anil Z; Oguz, Emrah; Zoghi, Mehdi

    2007-03-01

    We report a very rare case of primary mediastinal hydatid cyst which invaded the ascending aorta and the aortic arch which initially presented as a cranial mass. Aortic wall is a very unusual site for the hydatid cysts. To the best of our knowledge, this is the first reported case of hydatid cyst located within the aortic arch lumen. Patient underwent ascending aortic and hemiarch replacement under hypothermic circulatory arrest and removal of the cyst. Patient had an uneventful recovery and has been on follow-up. Although the literature data are very limited, we believe that the aortic procedure of choice should be graft interpositon rather than patch repair. PMID:17215134

  13. Using The Descending Aortic Wall Thickness Measured In Transesophageal Echocardiography As A Risk Marker For Aortic Dissection

    OpenAIRE

    Zaher Fanari; Sumaya Hammami; Muhammad Baraa Hammami; Safa Hammami; Chete Eze-Nliam; Weintraub, William S.

    2015-01-01

    Objective: The aim of this study is to estimate whether aortic wall thickness is increased in patients with Aortic dissection (AD) compared to low risk control group and can be used in addition to aortic diameter as a risk marker of AD. Background: AD occurs due to pathologies that may increase thickness of the aortic wall. Transesophageal echocardiography (TEE) has the ability to visualise both the thoracic aortic wall and lumen. Aortic diameter has been used to predict aortic dissection...

  14. The French Balloon Program 2013 - 2017

    Science.gov (United States)

    Dubourg, Vincent; Vargas, André; Raizonville, Philippe

    2016-07-01

    With over 50 years' experience in the field, the French Centre National d'Etudes Spatiales (CNES) goes on supporting - as designer and operator - a significant scientific ballooning program. In particular so because balloons still give a unique and valuable access to near space science. From 2008 to 2013, an important renovation effort was achieved, beginning by Zero Pressure Balloons (ZPB) systems, to comply with more stringent Safety constraints and to the growing reliability and performance requirements from scientific missions. The paper will give an overview of the CNES new capabilities and services for operational balloon activities, and their availability status. The scientific launch campaigns of the past two years will be presented. A focus will be made on the results of the Stratoscience 2015 flight campaign from Timmins, Ontario, using the NOSYCA command and control system for ZPB, qualified in flight in 2013. In particular, the PILOT telescope successfully flew during the 2015 campaign, key figures about the flight and mission will be given. An outlook of the new stratospheric long duration flight systems currently in process of developement at CNES will be given, as well as the presentation of the Stratéole 2 project, dedicated to the survey of the low stratosphere and upper troposphere in equatorial regions, with a fleet of small suprer pressure balloons (SPB). As far as tropospheric balloons are concerned, the Aeroclipper initiative will be presented, aiming at qualifying a quasi-tethered balloon, pushed by the winds close to the sea surface, for the study of cyclones. The scientific launch campaigns and the main payloads in the study for the near future will also be presented.

  15. Spectrum of Aortic Valve Abnormalities Associated with Aortic Dilation Across Age Groups in Turner Syndrome

    Science.gov (United States)

    Olivieri, Laura J.; Baba, Ridhwan Y.; Arai, Andrew E.; Bandettini, W. Patricia; Rosing, Douglas R.; Bakalov, Vladimir; Sachdev, Vandana; Bondy, Carolyn A.

    2014-01-01

    Background Congenital aortic valve fusion is associated with aortic dilation, aneurysm and rupture in girls and women with Turner syndrome (TS). Our objective was to characterize aortic valve structure in subjects with TS, and determine the prevalence of aortic dilation and valve dysfunction associated with different types of aortic valves. Methods and Results The aortic valve and thoracic aorta were characterized by cardiovascular magnetic resonance imaging in 208 subjects with TS in an IRB-approved natural history study. Echocardiography was used to measure peak velocities across the aortic valve, and the degree of aortic regurgitation. Four distinct valve morphologies were identified: tricuspid aortic valve (TAV) 64%(n=133), partially fused aortic valve (PF) 12%(n=25), bicuspid aortic valve (BAV) 23%(n=47), and unicuspid aortic valve (UAV) 1%(n=3). Age and body surface area (BSA) were similar in the 4 valve morphology groups. There was a significant trend, independent of age, towards larger BSA-indexed ascending aortic diameters (AADi) with increasing valve fusion. AADi were (mean +/− SD) 16.9 +/− 3.3 mm/m2, 18.3 +/− 3.3 mm/m2, and 19.8 +/− 3.9 mm/m2 (p<0.0001) for TAV, PF and BAV+UAV respectively. PF, BAV, and UAV were significantly associated with mild aortic regurgitation and elevated peak velocities across the aortic valve. Conclusions Aortic valve abnormalities in TS occur with a spectrum of severity, and are associated with aortic root dilation across age groups. Partial fusion of the aortic valve, traditionally regarded as an acquired valve problem, had an equal age distribution and was associated with an increased AADi. PMID:24084490

  16. Balloon dilatation of intrahepatic biliary strictures in liver transplantation

    International Nuclear Information System (INIS)

    Objective: To evaluate the efficacy of balloon dilatation in the treatment of intrahepatic biliary strictures in patients with liver transplantation. Methods: Of the 100 patients with liver transplantation, 16 patients had intrahepatic biliary strictures and received balloon dilatation treatment. Results: Initial technical balloon dilatation was successful in 14 caes but failed in 2 cases. There were no procedure-related complications. 4 restenosis occurred and they were treated with repeated balloon dilatation treatment. Conclusion: Balloon dilatation represented an effective and relatively safe treatment for biliary stricture in liver transplant recipients. For restenosis, balloon dilatation was also an effective treatment

  17. Jet Pump

    OpenAIRE

    Wærp, Nils Petter

    2010-01-01

    The aim of this project is to investigate how an artificial lift method in the oil industry works,and to compare its performance with other pump systems. Jet pumps are initially used in the oil industry for artificial lift and thus in order to do so one needs a good understanding of themechanics to predict the jet pumps’ performance. The project will begin with a review of how the jet pump operates, aiming to give the reader an insight and overview into the field of an artificial lift method....

  18. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... more likely we see aortic stenosis. Again, patient education is part of the evaluation and management of ... want to embrace less invasive or more progressive technology, you want to make ... with that information and certainly shouldn't be insulted by that. ...

  19. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... well. I want to underscore again that exercise testing is really not recommended in patient with classic symptoms in severe aortic stenosis, as it's probably more stress than the patient's heart should have to undergo. Once again, serial evaluations, as with any chronic disease process, are ...

  20. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... or in most patients who come to requiring surgery for aortic stenosis, left ventricular hypertrophy is a common manifestation. By that, I mean generally speaking any muscle that works harder in the body gets thicker and bigger over time and that's ...

  1. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... county more likely we see aortic stenosis. Again, patient education is part of the evaluation and management of valvular disease prior to surgery is paramount. It's important for a patient to understand really with any chronic condition what ...

  2. Minimally Invasive Aortic Valve Replacement

    Medline Plus

    Full Text Available ... valve in the aortic position will grow over time and proves a nice replacement. However, that's sort of operating on two valves to fix one valvular problem. And for most patients in our practice in their 50s, 60s, et cetera, we tend ...

  3. Uso do balão intra-aórtico no trans e pós-operatório de cirurgia cardíaca: análise de 80 casos consecutivos Use of intra-aortic balloon pump in cardiac surgery: analysis of 80 consecutive cases

    Directory of Open Access Journals (Sweden)

    Fernando Pivatto Júnior

    2012-06-01

    Full Text Available FUNDAMENTO: A síndrome de baixo débito cardíaco no perioperatório de cirurgia cardíaca pode incidir em cerca de 10 a 15% dos pacientes; desse total, 2% necessitam de suporte mecânico para adequado controle hemodinâmico. OBJETIVOS: Descrever a mortalidade de pacientes que necessitaram utilizar balão intra-aórtico (BIAo no trans ou pós-operatório de cirurgia cardíaca, identificando variáveis pré-operatórias associadas a pior desfecho, assim como descrever as complicações pós-operatórias e a sobrevida em médio prazo. MÉTODOS: Estudo de coorte retrospectivo incluindo 80 casos consecutivos entre janeiro/2009 e setembro/2011. Os pacientes possuíam, em média, 62,9 ± 11,3 anos e 58,8% eram do sexo masculino. Na amostra, 81,3% dos pacientes eram hipertensos, 50% tinham infarto do miocárdio prévio e 38,8%, insuficiência cardíaca NYHA III/IV. A principal cirurgia realizada foi a revascularização miocárdica isolada (37,5%. RESULTADOS:A mortalidade hospitalar nesta série foi de 53,8% (IC95%: 42,7-64,9, sendo o tempo de isquemia > 90 minutos preditor independente de mortalidade em análise multivariada (RR 1,52 IC95%: 1,04-2,22. Em relação às complicações, 71,3% (IC95%: 61,2-81,4 dos pacientes apresentaram ao menos uma complicação adicional no período perioperatório, sendo a isquemia do membro inferior observada em 5% dos pacientes. A sobrevida em 1 ano foi de 43,6%, observando-se um platô na curva de sobrevida após uma queda acentuada inicial, relacionada à mortalidade hospitalar. CONCLUSÕES: Os pacientes que necessitam do BIAo compõem um grupo de muito alto risco para morbidade e mortalidade; seu emprego, entretanto, permite recuperar muitos pacientes de uma evolução que seria invariavelmente fatal, tendo os pacientes com alta hospitalar uma boa sobrevida em médio prazo.BACKGROUND: About 10% to 15% of patients undergoing cardiac surgery may develop low cardiac output syndrome in the perioperative period; of this total, 2% require mechanical support for adequate hemodynamic control. OBJECTIVE: To describe the mortality rates of patients who required the use of IABP in the perioperative or postoperative period of cardiac surgery, identifying preoperative variables associated with a worse outcome, as well as to describe the postoperative complications and medium-term survival. METHODS: Retrospective cohort study including 80 consecutive cases between January/2009 and September/ 2011. The patients had on average 62.9 ± 11.3 years and 58.8% were male; 81.3% were hypertensive, 50.0% had prior myocardial infarction and 38.8% has NYHA III/IV heart failure. The mainsurgery performed was isolated coronary artery bypass grafting (37.5%. RESULTS: Hospital mortality was 53.8% (IC 95%: 42.7-64.9, and cross-clamp time > 90 minutes was an independent predictor of mortality in multivariate analysis (OR 1.52 CI 95%: 1.04-2.22. 71.3% of patients (CI 95%: 61.2-81.4 had at least one additional complication in the perioperative period, with lower limb ischemia observed in 5.0% patients. One-year survival was 43.6%, with a plateau in survival rates after a sharp initial drop, related to hospital mortality. CONCLUSION: Patients who require IABP comprise a group of very high risk for morbidity and mortality. IABP use, however, enables the recovery of many patients from an evolution that would invariably be fatal, and patients discharged from hospital have a good medium-term survival.

  4. Ballooning mode instability at the plasmapause

    Science.gov (United States)

    Lakhina, G. S.; Mond, M.; Hameiri, E.

    1990-01-01

    The ballooning mode instability, which can excite hydromagnetic waves at the plasmapause, is studied in the presence of azimuthal plasma flows induced during geomagnetically disturbed periods. A general sufficient criterion for the ballooning mode stability is derived, for a change in the potential energy greater than or equal to 0, which involves the integration over an entire field line. A local stability analysis at the equatorial plasmapause region shows that the ballooning modes could be spontaneously generated via instability under at least two conditions: one is similar to the usual interchange condition, and the second to the quasi-interchange modes. Both of these local instability conditions can be derived from the general stability criterion. Finally an exact solution for the equilibrium state with flow is derived analytically, and the change in the potential energy is computed numerically. It is found that, in the cases studied, the flow does not spontaneously excite the ballooning modes; it only further stabilizes (or destabilizes) the ballooning spectrum if originally the system is stable (or unstable). The analysis would be useful for the interpretation of some of the low-frequency modes observed at the ground and near the equatorial plasmapause.

  5. Electromagnetic pump

    International Nuclear Information System (INIS)

    The present invention provides an electromagnetic pump suitable to a recycling pump for liquid sodium as coolants of an FBR type reactor. Namely, a stator module of the electromagnetic pump of the present invention comprises a plurality of outer laminate iron core units and outer stator modules stacked alternately in the axial direction. With such a constitution, even a long electromagnetic pump having a large number of outer stator coils can be manufactured without damaging electric insulation of the outer stator coils. In addition, the inner circumferential surface of the outer laminate iron cores is urged and brought into contact with the outer circumferential surface of the outer duct by an elastic material. With such a constitution, Joule loss heat generated in the outer stator coils and internal heat generated in the outer laminate iron cores can be released to an electroconductive fluid flowing the inner circumference of the outer duct by way of the outer duct. (I.S.)

  6. Pump impeller

    International Nuclear Information System (INIS)

    A mixed-flow pump impeller, which may be used, for example, as a primary pump for circulating sodium as the primary coolant in a fast nuclear reactor, is described which comprises an impeller with evenly-spaced blades. Some of the blades, which are symmetrically disposed around the axis of rotation of the impeller, extend beyond the ends of the other blades towards the suction side of the pump to form an inducer. The channels defined between the extensions of the extended blades follow helical paths parallel to the axis of rotation. The leading edges of the unextended blades are interposed between the extended blades in the region of divergence of flow from the axis of rotation. The provision of the inducer reduces the risk of cavitation in the pump, which could cause rapid wear of the impeller. A shroud may be provided for the unextended blades. (author)

  7. Electrokinetic pump

    Energy Technology Data Exchange (ETDEWEB)

    Patel, Kamlesh D. (Dublin, CA)

    2007-11-20

    A method for altering the surface properties of a particle bed. In application, the method pertains particularly to an electrokinetic pump configuration where nanoparticles are bonded to the surface of the stationary phase to alter the surface properties of the stationary phase including the surface area and/or the zeta potential and thus improve the efficiency and operating range of these pumps. By functionalizing the nanoparticles to change the zeta potential the electrokinetic pump is rendered capable of operating with working fluids having pH values that can range from 2-10 generally and acidic working fluids in particular. For applications in which the pump is intended to handle highly acidic solutions latex nanoparticles that are quaternary amine functionalized can be used.

  8. Primary stenting in the treatment of focal atherosclerotic abdominal aortic stenoses

    Energy Technology Data Exchange (ETDEWEB)

    Poncyljusz, W.; Falkowski, A.; Garncarek, J.; Karasek, M.; England, S.; Zawierucha, D

    2006-08-15

    Aim: To evaluate the results of primary stent placement in focal atherosclerotic aortic stenoses using balloon expandable stents. Materials and methods: Twenty-six primary balloon expandable stent placements in the abdominal aorta were performed and reviewed. All the aortic stenoses were atherosclerotic. Patients were followed up by ankle/brachial pressure indices (ABPI) and Doppler ultrasound (US) at 24 h after procedure and at 12 and 24 months. Follow-up angiograms were performed at 12 months. Results: Twenty-six stents in 26 patients were placed in the infrarenal aorta. All procedures were technically successful and immediate clinical success was obtained. The mean ABPI significantly improved from 0.52 {+-} 0.10 to 0.94 {+-} 0.09 within 24 h after procedure, and remained at 0.90 {+-} 0.12 between 12 and 24 months follow-up (mean 18 months). There was full haemodynamic success at hospital discharge and at 12 and 24 months after the procedure. Clinical success at 12 and 24 months (mean 18 months) was defined as an improvement in the Fontaine classification by at least one class compared with the pre-procedure class and was shown to be 100%. Conclusion: In summary, we report that primary stenting is a safe and effective alternative to surgery in cases of symptomatic stenosis of the infrarenal abdominal aorta. The excellent intermediate term results suggested that we would recommend primary stenting as the treatment of choice for focal atherosclerotic stenoses of the infrarenal aorta in selected patients.

  9. MDCT evaluation of acute aortic syndrome (AAS).

    Science.gov (United States)

    Valente, Tullio; Rossi, Giovanni; Lassandro, Francesco; Rea, Gaetano; Marino, Maurizio; Muto, Maurizio; Molino, Antonio; Scaglione, Mariano

    2016-05-01

    Non-traumatic acute thoracic aortic syndromes (AAS) describe a spectrum of life-threatening aortic pathologies with significant implications on diagnosis, therapy and management. There is a common pathway for the various manifestations of AAS that eventually leads to a breakdown of the aortic intima and media. Improvements in biology and health policy and diffusion of technology into the community resulted in an associated decrease in mortality and morbidity related to aortic therapeutic interventions. Hybrid procedures, branched and fenestrated endografts, and percutaneous aortic valves have emerged as potent and viable alternatives to traditional surgeries. In this context, current state-of-the art multidetector CT (MDCT) is actually the gold standard in the emergency setting because of its intrinsic diagnostic value. Management of acute aortic disease has changed with the increasing realization that endovascular therapies may offer distinct advantages in these situations. This article provides a summary of AAS, focusing especially on the MDCT technique, typical and atypical findings and common pitfalls of AAS, as well as recent concepts regarding the subtypes of AAS, consisting of aortic dissection, intramural haematoma, penetrating atherosclerotic ulcer and unstable aortic aneurysm or contained aortic rupture. MDCT findings will be related to pathophysiology, timing and management options to achieve a definite and timely diagnostic and therapeutic definition. In the present article, we review the aetiology, pathophysiology, clinical presentation, outcomes and therapeutic approaches to acute aortic syndromes. PMID:27033344

  10. Near ultraviolet spectrograph for balloon platform

    Science.gov (United States)

    Sreejith, A. G.; Safonova, Margarita; Murthy, Jayant

    2015-06-01

    Small and compact scientific payloads may be easily designed constructed and own on high altitude balloons. Despite the fact that large orbital observatories provide accurate observations and statistical studies of remote and/or faint space sources, small telescopes on board balloons or rockets are still attractive because of their low cost and rapid response time. We describe here a near ultraviolet (NUV) spectrograph designed to be own on a high{altitude balloon platform. Our basic optical design is a modified Czerny-Turner system using off the shelf optics. We compare different methods of aberration corrections in such a system. We intend the system to be portable and scalable to different telescopes. The use of reflecting optics reduces the transmission loss in UV. We plan on using an image intensified CMOS sensor operating in photon counting mode as the detector of choice.

  11. Performance of latex balloons for optical computed tomography

    Science.gov (United States)

    Jordan, K.; Walsh, A.; Peng, M.; Battista, J.

    2013-06-01

    Latex balloons filled with radiation sensitive hydrogels were evaluated as 3D dosimeters with optical computed tomography (CT) readout. Custom balloons, with less than 10 cm diameters, were made from latex sheets. Commercial, 13 cm diameter, clear balloons were investigated for larger volumes. Ferrous-xylenol orange and genipin gelatin gels selected for 1 and 30 Gy experiments, respectively. The thin stretched latex membrane allowed optical imaging to within 1 mm of the interior balloon edge. Reconstructed dose distributions demonstrated valid measurements to within 2 mm of the balloon surface. The rubber membrane provides a hybrid approach to deforming hydrogels. Uniform irradiation of a deformed gel resulted in a uniform dose being measured when scanned in the relaxed, initial balloon shape. The 13 cm diameter balloons were also effective and inexpensive vessels for hydrogels due to their high clarity, thinness and mechanical strength. Latex balloons represent an inexpensive method to obtain useful information from nearly the entire dosimeter volume.

  12. Transcatheter aortic valve implantation versus surgical aortic valve replacement for severe aortic stenosis: a meta analysis

    Institute of Scientific and Technical Information of China (English)

    WU Yi-cheng; ZHANG Jian-feng; SHEN Wei-feng; ZHAO Qiang

    2013-01-01

    Background Transcatheter aortic valve implantation (TAVI) has emerged as the treatment choice for non-operable patients with severe symptomatic aortic stenosis (AS) and may be a good alternative to surgery for those at very high or prohibitive surgical risk.We performed a meta-analysis to evaluate the comparative benefits of TAVI versus surgical aortic valve replacement (SAVR) in patients with severe AS.Methods A comprehensive literature search of PubMed,Embase,ScienceDirect and Cochrane Central Register of Controlled trials was performed,and randomized trials as well as cohort studies with propensity score analysis were included.Results One randomized trial (n=699) and six retrospective cohort studies (n=781) were selected for meta-analysis.Mortality at 30-day and 1-year follow-up was comparable between TAVI and SAVR.Despite similar incidences of stroke,myocardial infarction,re-operation for bleeding,and renal failure requiring dialysis,TAVI was associated with a lower occurrence rate of new-onset atrial fibrillation (OR 0.51,95% CI 0.33-0.78) and shorter procedural time (mean difference -67.50 minutes,95% CI-87.20 to-47.81 minutes).Post-operative aortic regurgitation and permanent pacemaker implantation were more common in patients after TAVI than in those with SAVR (OR 5.53,95% CI 3.41-8.97; OR 1.71,95% Cl 1.02-2.84,respectively).Conclusion In patients with severe symptomatic AS,TAVI and SAVR did not differ with respect to short-and mid-term survival,but the incidence of permanent pacemaker implantation and post-procedural aortic regurgitation remain relatively high after TAVI.

  13. Indexing aortic valve area by body surface area increases the prevalence of severe aortic stenosis

    DEFF Research Database (Denmark)

    Jander, Nikolaus; Gohlke-Bärwolf, Christa; Bahlmann, Edda;

    2014-01-01

    To account for differences in body size in patients with aortic stenosis, aortic valve area (AVA) is divided by body surface area (BSA) to calculate indexed AVA (AVAindex). Cut-off values for severe stenosis are...

  14. Balloon catheter dilatation of esophageal strictures

    International Nuclear Information System (INIS)

    The authors performed 27 fluoroscopically guided balloon dilatation in 12 patients of esophageal stricture during recent 3 years. The causes of esophageal stricture were corrosive esophagitis (N=2) and congenital narrowing (N=1), including postoperative narrowing in achalasia (N=3), esophageal varix (N=3), lye stricture (N=2) and esophageal cancer (N=1). Successful dilatation of the stricture was achieved during the procedure in 10 patients(83%). Major complication such as esophageal rupture was not found. The authors conclude that fluoroscopically guided esophageal balloon dilatation is a safe and effective method for treatment of symptomatic esophageal strictures

  15. Balloon catheter dilatation of esophageal strictures

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Jeung Sook; Yoon, Yup; Sung, Dong Yook; Choi, Woo Suk; Nam, Kyung Jin; Lim, Jae Hoon [Kyunghee University College of Medicine, Seoul (Korea, Republic of)

    1990-07-15

    The authors performed 27 fluoroscopically guided balloon dilatation in 12 patients of esophageal stricture during recent 3 years. The causes of esophageal stricture were corrosive esophagitis (N=2) and congenital narrowing (N=1), including postoperative narrowing in achalasia (N=3), esophageal varix (N=3), lye stricture (N=2) and esophageal cancer (N=1). Successful dilatation of the stricture was achieved during the procedure in 10 patients(83%). Major complication such as esophageal rupture was not found. The authors conclude that fluoroscopically guided esophageal balloon dilatation is a safe and effective method for treatment of symptomatic esophageal strictures.

  16. High altitude balloon experiments at IIA

    Science.gov (United States)

    Nayak, Akshata; Sreejith, A. G.; Safonova, Margarita; Murthy, Jayant

    Recent advances in balloon experiments as well as in electronics have made it possible to fly scientific payloads at costs accessible to university departments. We have begun a program of high altitude ballooning at the Indian Institute of Astrophysics, Bengaluru. The primary purpose of this activity is to test low-cost ultraviolet (UV) payloads for eventual space flight, but we will also try scientific exploration of the phenomena occurring in the upper atmosphere, including sprites and meteorite impacts. We present the results of the initial experiments carried out at the CREST campus of IIA, Hosakote, and describe our plans for the future.

  17. Performance of the EUSO-Balloon electronics

    Science.gov (United States)

    Barrillon, P.; Bacholle, S.; Bayer, J.; Blaksley, C.; Blin, S.; Cafagna, F.; Dagoret, S.; Fornaro, C.; Gorodetzky, P.; Jung, A.; Karczmarczyk, J.; De La Taille, C.; Medina Tanco, G.; Miyamoto, H.; Moretto, C.; Osteria, G.; Park, I.; Perfetto, F.; Prévôt, G.; Prat, P.; Rabanal Reina, J.; Rojas, J.; Santiago, L.; Scotti, V.; Silva, H.; Szabelski, J.

    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.

  18. Catalytic Generation of Lift Gases for Balloons

    Science.gov (United States)

    Zubrin, Robert; Berggren, Mark

    2011-01-01

    A lift-gas cracker (LGC) is an apparatus that generates a low-molecular-weight gas (mostly hydrogen with smaller amounts of carbon monoxide and/or carbon dioxide) at low gauge pressure by methanol reforming. LGCs are undergoing development for use as sources of buoyant gases for filling zero-gauge-pressure meteorological and scientific balloons in remote locations where heavy, high-pressure helium cylinders are not readily available. LGCs could also be used aboard large, zero-gauge-pressure, stratospheric research balloons to extend the duration of flight.

  19. Balloon dilatation of alimentary tract strictures

    International Nuclear Information System (INIS)

    From a series of balloon dilatations of alimentary tract strictures 11 patients with different types of gastric and oesophagogastric anastomotic stenoses are reported. The dilatation of gastric outflow tract obstructions was highly effective in the treatment of retention. In 7 out of 8 cases with gastric outflow stenosis surgery could be entirely avoided and replaced by balloon dilatation. The importance of eliminating retention in the healing of gastric ulcer is discussed. Fistulation in oesophagogastric anastomoses due to stenosis of the outflow portion was successfully treated. The importance of achieving a free outflow tract in order to prevent insufficiency of the anastomosis and formation of a fistula is stressed. (orig.)

  20. Particle Astrophysics in NASA's Long Duration Balloon Program

    International Nuclear Information System (INIS)

    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

  1. Congenital aortic regurgitation in a child with a tricuspid non-stenotic aortic valve.

    OpenAIRE

    Hashimoto, R; Miyamura, H; Eguchi, S

    1984-01-01

    After follow up for seven years a 10 year old boy with congenital aortic regurgitation was found to have a tricuspid non-stenotic aortic valve at operation. The right coronary cusp was dysplastic, thickened, and contracted; the gap between its free margin and aortic wall was bridged with two fibrous bands; and the left coronary and non-coronary cusps were almost normal. The aortic valve was replaced with a prosthesis (St Jude Medical No 23), and the postoperative course was uneventful.

  2. Increased Production of Sonic Hedgehog by Ballooned Hepatocytes

    OpenAIRE

    Rangwala, Fatima; Cynthia D Guy; Lu, Jiuyi; SUZUKI, Ayako; Burchette, James L.; Abdelmalek, Manal F; Chen, Wei; Diehl, Anna Mae

    2011-01-01

    Ballooned hepatocytes distinguish nonalcoholic steatohepatitis (NASH) from steatosis. Such cells contain dilated endoplasmic reticulum and ubiquitin aggregates, characteristics of endoplasmic reticulum stress. Hepatocyte ballooning increases risk for fibrosis in NASH, suggesting ballooned hepatocytes release pro-fibrogenic factors. Hedgehog ligands function as pro-fibrogenic factors in liver diseases, but mechanisms for Hedgehog ligand production remain poorly understood. We evaluated the hyp...

  3. Auditory Risk of Exploding Hydrogen-Oxygen Balloons

    Science.gov (United States)

    Gee, Kent L.; Vernon, Julia A.; Macedone, Jeffrey H.

    2010-01-01

    Although hydrogen-oxygen balloon explosions are popular demonstrations, the acoustic impulse created poses a hearing damage risk if the peak level exceeds 140 dB at the listener's ear. The results of acoustical measurements of hydrogen-oxygen balloons of varying volume and oxygen content are described. It is shown that hydrogen balloons may be…

  4. 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...

  5. MARFAN SYNDROME AND QUADRICUSPID AORTIC VALVE

    OpenAIRE

    Sürücü, Hüseyin; ÇİMEN, Sadi

    2013-01-01

    ABSTRACTWhile the major cardiovascular manifestation in Marfan syndrome is a progressive dilatation of the ascending aorta, leading to aortic aneurysm formation and eventually to fatal aortic rupture or dissection, mitral valve prolapse and calcification of the mitral valve annulus, dilatation of the main pulmonary artery may be seen. There was no knowledge about the association of Marfan syndrome and quadricuspid aortic valve. In this case report, we aimed to declare this association between...

  6. Recurrent tamponade and aortic dissection in syphilis.

    Science.gov (United States)

    Stansal, Audrey; Mirault, Tristan; Rossi, Aude; Dupin, Nicolas; Bruneval, Patrick; Bel, Alain; Azarine, Arshid; Minozzi, Catherine; Deman, Anne Laure; Messas, Emmanuel

    2013-11-01

    Syphilitic cardiovascular disease has been described since the 19th century, mainly on autopsy series. Major clinical manifestations are aortic aneurysm, aortic insufficiency, and coronary ostial stenosis. The diagnosis of syphilitic cardiovascular disease is based mainly on positive serologic tests and overt clinical manifestations. We present here a rare and unusual clinical presentation of a tertiary syphilis with recurrent tamponade and type B aortic dissection, whose positive diagnosis was made by polymerase chain reaction on pericardial fluid analysis. PMID:24182507

  7. Treatment options for postdissection aortic aneurysms.

    Science.gov (United States)

    Sobocinski, Jonathan; Patterson, Benjamin O; Clough, Rachel E; Spear, Rafaelle; Martin-Gonzalez, Teresa; Azzaoui, Richard; Hertault, Adrien; Haulon, Stéphan

    2016-04-01

    Aortic dissection is one of the most devastating catastrophes that can affect the aorta. Surgical treatment is proposed only when complications such as rupture or malperfusion occur. No clear consensus has been reached regarding the best therapy to prevent aortic rupture after the acute phase. We have performed a thorough review of the most recent literature on the strategies to treat patients in the chronic phase of aortic dissection. PMID:26771869

  8. Revascularização da artéria marginal com uso da artéria torácica interna direita pediculada retroaórtica sem circulação extracorpórea Off-pump grafting of the circumflex artery with pedicled retro-aortic right internal thoracic artery graft

    Directory of Open Access Journals (Sweden)

    Walter J. Gomes

    2005-03-01

    , improving survival. We present the technique of OPCAB using both pedicled ATI grafts, with the right ITA (RITA routed retro-aortic through the transverse sinus, to revascularize the branches of the circumflex artery (Cx. METHOD: Twenty-six patients, who underwent OPCAB with bilateral ATI grafts, were studied, where the left ATI (LITA was used to revascularize the left anterior descending artery (LAD and the pedicled RITA, routed through the transverse sinus and anastomosed to the branches of the Cx. Twenty-one patients were male and five female, the age ranging between 42 and 74 years. The morbidities observed in this cohort were previous myocardial infarction in 18 (69% patients, diabetes mellitus in 10 (38%, renal failure in four (7.7% and AIDS in one (3.8% patient. RESULTS: No patient presented ECG changes or enzymatic increases in the postoperative period. The grafts per patient varied from two to four (average 3.0 grafts/patient. No cases of sternal infection or dehiscence were observed. One patient had a stroke on the 4º postoperative day and died. The postoperative hospital stay varied between 3 to 12 days (average 5.8±2.0 days. No late deaths or cardiovascular events were recorded. CONCLUSIONS: This technique makes off-pump grafting of the circumflex artery branches using the pedicled RITA possible and potentially enhances the benefits of coronary artery bypass surgery.

  9. A system for visualization and automatic placement of the endoclamp balloon catheter

    Science.gov (United States)

    Furtado, Hugo; Stüdeli, Thomas; Sette, Mauro; Samset, Eigil; Gersak, Borut

    2010-02-01

    The European research network "Augmented Reality in Surgery" (ARIS*ER) developed a system that supports minimally invasive cardiac surgery based on augmented reality (AR) technology. The system supports the surgical team during aortic endoclamping where a balloon catheter has to be positioned and kept in place within the aorta. The presented system addresses the two biggest difficulties of the task: lack of visualization and difficulty in maneuvering the catheter. The system was developed using a user centered design methodology with medical doctors, engineers and human factor specialists equally involved in all the development steps. The system was implemented using the AR framework "Studierstube" developed at TU Graz and can be used to visualize in real-time the position of the balloon catheter inside the aorta. The spatial position of the catheter is measured by a magnetic tracking system and superimposed on a 3D model of the patient's thorax. The alignment is made with a rigid registration algorithm. Together with a user defined target, the spatial position data drives an actuator which adjusts the position of the catheter in the initial placement and corrects migrations during the surgery. Two user studies with a silicon phantom show promising results regarding usefulness of the system: the users perform the placement tasks faster and more accurately than with the current restricted visual support. Animal studies also provided a first indication that the system brings additional value in the real clinical setting. This work represents a major step towards safer and simpler minimally invasive cardiac surgery.

  10. Hybrid treatment of penetrating aortic ulcer

    Energy Technology Data Exchange (ETDEWEB)

    Lara, Juan Antonio Herrero; Martins-Romeo, Daniela de Araujo; Escudero, Carlos Caparros; Falcon, Maria del Carmen Prieto; Batista, Vinicius Bianchi, E-mail: jaherrero5@hotmail.com [Unidade de Gestao Clinica (UGC) de Diagnostico por Imagem - Hosppital Universitario Virgen Macarena, Sevilha (Spain); Vazquez, Rosa Maria Lepe [Unit of Radiodiagnosis - Hospital Nuestra Senora de la Merced, Osuna, Sevilha (Spain)

    2015-05-15

    Penetrating atherosclerotic aortic ulcer is a rare entity with poor prognosis in the setting of acute aortic syndrome. In the literature, cases like the present one, located in the aortic arch, starting with chest pain and evolving with dysphonia, are even rarer. The present report emphasizes the role played by computed tomography in the diagnosis of penetrating atherosclerotic ulcer as well as in the differentiation of this condition from other acute aortic syndromes. Additionally, the authors describe a new therapeutic approach represented by a hybrid endovascular surgical procedure for treatment of the disease. (author)

  11. Abdominal Aortic Surgery: Anesthetic Implications

    OpenAIRE

    Cunningham, Anthony J.

    1991-01-01

    The objectives of the review are to highlight the clinical characteristics of the patient population; to assess multivariate risk factor analysis and the invasive/non-invasive techniques available for risk factor identification and management in this high-risk surgical population; to assess the major hemodynamic, metabolic, and regional blood flow changes associated with aortic cross-clamping/unclamping procedures and techniques for their modification or attenuation; and to assess the influen...

  12. Transverse Aortic Constriction in Mice

    OpenAIRE

    deAlmeida, Angela C.; van Oort, Ralph J.; Wehrens, Xander H. T.

    2010-01-01

    Transverse aortic constriction (TAC) in the mouse is a commonly used experimental model for pressure overload-induced cardiac hypertrophy and heart failure.1 TAC initially leads to compensated hypertrophy of the heart, which often is associated with a temporary enhancement of cardiac contractility. Over time, however, the response to the chronic hemodynamic overload becomes maladaptive, resulting in cardiac dilatation and heart failure.2 The murine TAC model was first validated by Rockman et ...

  13. Metabolic and hemodynamic effects of saline infusion to maintain volemia on temporary abdominal aortic occlusion

    Directory of Open Access Journals (Sweden)

    Fábio Ferreira Amorim

    2002-10-01

    Full Text Available OBJECTIVE: To analyze hemodynamic and metabolic effects of saline solution infusion in the maintenance of blood volume in ischemia-reperfusion syndrome during temporary abdominal aortic occlusion in dogs. METHODS: We studied 20 dogs divided into 2 groups: the ischemia-reperfusion group (IRG, n=10 and the ischemia-reperfusion group with saline solution infusion aiming at maintaining mean pulmonary arterial wedge pressure between 10 and 20 mmHg (IRG-SS, n=10. All animals were anesthetized with sodium thiopental and maintained on spontaneous ventilation. Occlusion of the supraceliac aorta was obtained with inflation of a Fogarty catheter inserted through the femoral artery. After 60 minutes of ischemia, the balloon was deflated, and the animals were observed for another 60 minutes of reperfusion. RESULTS: IRG-SS dogs did not have hemodynamic instability after aortic unclamping, and the mean systemic blood pressure and heart rate were maintained. However, acidosis worsened, which was documented by a greater reduction of arterial pH that occurred especially due to the absence of a respiratory response to metabolic acidosis that was greater with the adoption of this procedure. CONCLUSION: Saline solution infusion to maintain blood volume avoided hemodynamic instability after aortic unclamping. This procedure, however, caused worsening in metabolic acidosis in this experimental model.

  14. Insulin pumps.

    Science.gov (United States)

    Pickup, J

    2011-02-01

    The last year has seen a continued uptake of insulin pump therapy in most countries. The USA is still a leader in pump use, with probably some 40% of type 1 diabetic patients on continuous subcutaneous insulin infusion (CSII), but the large variation in usage within Europe remains, with relatively high use (> 15%) in, for example, Norway, Austria, Germany and Sweden and low use (companies or funding from national health services, the availability of sufficient diabetes nurse educators and dietitians trained in pump procedures, and clear referral pathways for the pump candidate from general practitioner or general hospital to specialist pump centre. There are now several comprehensive national guidelines on CSII use (see ATTD Yearbook 2009) but more work needs to be done in unifying uptake and ensuring all those who can benefit do so. Technology developments recently include increasing use of pumps with continuous glucose monitoring (CGM) connectivity (see elsewhere in this volume) and the emergence of numerous manufacturers developing so-called 'patch pumps', often for the type 2 diabetes market. Interestingly, the evidence base for CSII in this group is not well established, and for this reason the selected papers on CSII in this section include several in this area. The use of CSII in diabetic pregnancy is a long-established practice, in spite of the lack of evidence that it is superior to multiple daily injections (MDI), and few randomised controlled trials have been done in recent years. Several papers in this field this year continue the debate about the usefulness of CSII in diabetic pregnancy and are reviewed here. It is pleasing to see more research on the psychosocial aspects of CSII during the year, both from the point of view of how psychological beliefs influence outcomes on CSII (is there a type of patient who does particularly well or poorly on CSII?) and how CSII affects psychological factors like mood, behaviour and quality of life. Quality of

  15. DIFFUSION PUMP

    Science.gov (United States)

    Levenson, L.

    1963-09-01

    A high-vacuum diffusion pump is described, featuring a novel housing geometry for enhancing pumping speed. An upright, cylindrical lower housing portion is surmounted by a concentric, upright, cylindrical upper housing portion of substantially larger diameter; an uppermost nozzle, disposed concentrically within the upper portion, is adapted to eject downwardly a conical sheet of liquid outwardly to impinge upon the uppermost extremity of the interior wall of the lower portion. Preferably this nozzle is mounted upon a pedestal rising coaxially from within the lower portion and projecting up into said upper portion. (AEC)

  16. Space and Earth Observations from Stratospheric Balloons

    Science.gov (United States)

    Peterzen, Steven; Ubertini, Pietro; Masi, Silvia; Ibba, Roberto; Ivano, Musso; Cardillo, Andrea; Romeo, Giovanni; Dragøy, Petter; Spoto, Domenico

    Stratospheric balloons are rapidly becoming the vehicle of choice for near space investigations and earth observations by a variety of science disciplines. With the ever increasing research into climatic change, instruments suspended from stratospheric balloons offer the science team a unique, stable and reusable platform that can circle the Earth in the polar region or equatorial zone for thirty days or more. The Italian Space Agency (ASI) in collaboration with Andoya Rocket Range (Andenes, Norway) has opened access in the far northern latitudes above 78o N from Longyearbyen, Svalbard. In 2006 the first Italian UltraLite Long Duration Balloon was launched from Baia Terra Nova, Mario Zuchelli station in Antarctica and now ASI is setting up for the their first equatorial stratospheric launch from their satellite receiving station and rocket launch site in Malindi, Kenya. For the equatorial missions we have analysed the statistical properties of trajectories considering the biennal oscillation and the seasonal effects of the stratospheric winds. Maintaining these launch sites offer the science community 3 point world coverage for heavy lift balloons as well as the rapidly deployed Ultralight payloads and TM system ASI developed to use for test platforms, micro experiments, as well as a comprehensive student pilot program

  17. The effect of ballooning model in ISAAC

    International Nuclear Information System (INIS)

    The purpose of this paper is to analyze the ballooning effect in the fuel channel with the ISAAC (Integrated Severe Accident Analysis code for CANDU Plants) computer code which was developed for the severe accident analysis at CANDU plants. Cladding/PT ballooning model parameter in the ISAAC code is used to analyze its effect mainly on the hydrogen production from the fuel channel. According to the current ISAAC version, cladding failure occurs when the cladding temperature exceeds a user-specified failure temperature, resulting in a fission products release from the fuel rod to the primary system. The typical accident sequences of a loss of feed water (LOFW) and a large LOCA (LLOCA) scenario are selected. Unlike the PWRs, the ballooning effect in CANDU plants is not so clear during the low pressure sequences. Instead, pressure tube ballooning during the high pressure sequences decreases the amount of hydrogen generated from the fuel when pressure tube-calandria tube contact occurs, resulting in a cladding and pressure tube temperature decrease. (authors)

  18. Treatment of tuberculous bronchostenosis: balloon bronchoplasty

    International Nuclear Information System (INIS)

    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

  19. A case of balloon rupture during insertion of an intragastric balloon for treatment of morbid obesity

    OpenAIRE

    Bor, Serhat; TURAN, İlker; ÖZÜTEMİZ, Ömer

    2007-01-01

    The therapeutic options for treatment of morbid obesity are diet, exercise, behavioral modifications, medical treatment and bariatric surgery. An alternative approach to surgery is the endoscopic placement in the stomach of balloons which are filled with liquid, providing a sensation of fullness that decreases food consumption. The rate of complications associated with the placement of intragastric balloons is low. A significant late complication is deflation and/or displacement of the...

  20. Stratospheric Balloon Platforms for Near Space Access

    Science.gov (United States)

    Dewey, R. G.

    2012-12-01

    For over five decades, high altitude aerospace balloon platforms have provided a unique vantage point for space and geophysical research by exposing scientific instrument packages and experiments to space-like conditions above 99% of Earth's atmosphere. Reaching altitudes in excess of 30 km for durations ranging from hours to weeks, high altitude balloons offer longer flight durations than both traditional sounding rockets and emerging suborbital reusable launch vehicles. For instruments and experiments requiring access to high altitudes, engineered balloon systems provide a timely, responsive, flexible, and cost-effective vehicle for reaching near space conditions. Moreover, high altitude balloon platforms serve as an early means of testing and validating hardware bound for suborbital or orbital space without imposing space vehicle qualifications and certification requirements on hardware in development. From float altitudes above 30 km visible obscuration of the sky is greatly reduced and telescopes and other sensors function in an orbit-like environment, but in 1g. Down-facing sensors can take long-exposure atmospheric measurements and images of Earth's surface from oblique and nadir perspectives. Payload support subsystems such as telemetry equipment and command, control, and communication (C3) interfaces can also be tested and operationally verified in this space-analog environment. For scientific payloads requiring over-flight of specific areas of interests, such as an active volcano or forest region, advanced mission planning software allows flight trajectories to be accurately modeled. Using both line-of-sight and satellite-based communication systems, payloads can be tracked and controlled throughout the entire mission duration. Under NASA's Flight Opportunities Program, NSC can provide a range of high altitude flight options to support space and geophysical research: High Altitude Shuttle System (HASS) - A balloon-borne semi-autonomous glider carries

  1. [Surgical aspects of acute aortic dissection].

    Science.gov (United States)

    Laas, J; Heinemann, M; Jurmann, M; Borst, H G

    1992-12-01

    This paper highlights some of the surgical aspects of acute aortic dissections such as: emergency diagnosis, indications for surgery, reconstructive operative techniques, malperfusion phenomena and necessity for follow-up. Aortic dissection is caused by an intimal tear, called the "entry", and subsequent splitting of the media by the stream of blood. Two lumina are thus created, which may communicate through "re-entries". As this creates severe weakness of the aortic wall, rupture and/or dilatation are the imminent dangers of acute aortic dissection. Acute aortic dissection type A, by definition involving the ascending aorta (Figures 1 and 2), is an absolute indication for emergency surgical treatment, because its natural history shows an extremely poor outcome (Figure 3). Due to impending (intrapericardial) aortic rupture, it may be necessary to limit diagnostic procedures to a minimum. Transesophageal echocardiography is the method of choice for establishing a quick, precise and reliable diagnosis (Figure 4). In stable patients, computed tomography gives additional information about aortic diameters or sites of extrapericardial perforation. Digital subtraction angiography (DSA) shows perfusion of the lumina and dependent organs. The surgical strategy in acute aortic dissection type A aims at replacement of the ascending aorta. Reconstructive techniques have to be considered, especially in aortic valve regurgitation without annuloectasia (Figures 5 and 6). In recent times, the use of GRF tissue glue has reduced the need for teflon felt. Involvement of the aortic arch should be treated aggressively up to the point of total arch replacement in deep hypothermic circulatory arrest as part of the primary procedure (Figure 7). Malperfusion phenomena of aortic branches remain risk-factors.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:1483624

  2. 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.

  3. Measurements of gondola motion on a stratospheric balloon flight

    CERN Document Server

    Safonova, Margarita; Sreejith, A G; Sarpotdar, Mayuresh; Ambily, S; Prakash, Ajin; Mathew, Joice; Murthy, Jayant; Anand, Devarajan; Kapardhi, B V N; Kumar, B Suneel; Kulkarni, P M

    2016-01-01

    Balloon experiments are an economically feasible method of conducting observations in astronomy that are not possible from the ground. The astronomical payload may include a telescope, a detector, and a pointing/stabilization system. Determining the attitude of the payload is of primary importance in such applications, to accurately point the detector/telescope to the desired direction. This is especially important in generally unstable lightweight balloon flights. However, the conditions at float altitudes, which can be reached by zero pressure balloons, could be more stable, enabling accurate pointings. We have used the Inertial Measurement Unit (IMU), placed on a stratospheric zero pressure balloon, to observe 3-axis motion of a balloon payload over a fight time of 4.5 hours, from launch to the float altitude of 31.2 km. The balloon was launched under nominal atmospheric conditions on May 8th 2016, from a Tata Institute of Fundamental Research Balloon Facility, Hyderabad.

  4. Pregnancy after aortic root replacement in Loeys-Dietz syndrome: High risk of aortic dissection.

    Science.gov (United States)

    Braverman, Alan C; Moon, Marc R; Geraghty, Patrick; Willing, Marcia; Bach, Christopher; Kouchoukos, Nicholas T

    2016-08-01

    Loeys-Dietz syndrome due to mutations in TGFBR1 and 2 is associated with early and aggressive aortic aneurysm and branch vessel disease. There are reports of uncomplicated pregnancy in this condition, but there is an increased risk of aortic dissection and uterine rupture. Women with underlying aortic root aneurysm are cautioned about the risk of pregnancy-related aortic dissection. Prophylactic aortic root replacement is recommended in women with aortopathy and aortic root dilatation to lessen the risk of pregnancy. There is limited information in the literature about the outcomes of pregnancy after root replacement in Loeys-Dietz syndrome. We present a case series of three women with Loeys-Dietz syndrome who underwent elective aortic root replacement for aneurysm disease and subsequently became pregnant and underwent Cesarean section delivery. Each of these women were treated with beta blockers throughout pregnancy. Surveillance echocardiograms and noncontrast MRA studies during pregnancy remained stable demonstrating no evidence for aortic enlargement. Despite the normal aortic imaging and careful observation, two of the three women suffered acute aortic dissection in the postpartum period. These cases highlight the high risk of pregnancy following aortic root replacement in Loeys-Dietz syndrome. Women with this disorder are recommended to be counseled accordingly. © 2016 Wiley Periodicals, Inc. PMID:27125181

  5. Infected aortic aneurysm and inflammatory aortic aneurysm. In search of an optimal differential diagnosis

    International Nuclear Information System (INIS)

    Infected aortic aneurysm and inflammatory aortic aneurysm each account for a minor fraction of the total incidence of aortic aneurysm and are associated with periaortic inflammation. Despite the similarity, infected aortic aneurysm generally shows a more rapid change in clinical condition, leading to a fatal outcome; in addition, delayed diagnosis and misuse of corticosteroid or immunosuppressing drugs may lead to uncontrolled growth of microorganisms. Therefore, it is mandatory that detection of aortic aneurysm is followed by accurate differential diagnosis. In general, infected aortic aneurysm appears usually as a saccular form aneurysm with nodularity, irregular configuration; however, the differential diagnosis may not be easy sometimes for the following reasons: symptoms, such as abdominal and/or back pain and fever, and blood test abnormalities, such as elevated C-reactive protein and enhanced erythrocyte sedimentation rate, are common in infected aortic aneurysm, but they are not found infrequently in inflammatory aortic aneurysm; some inflammatory aortic aneurysms are immunoglobulin (Ig) G4-related, but not all of them; the prevalence of IgG4 positivity in infected aortic aneurysm has not been well investigated; enhanced uptake of 18F-fluorodeoxyglucose (FDG) by 18F-FDG-positron emission tomography may not distinguish between inflammation mediated by autoimmunity and that mediated by microorganism infection. Here we discuss the characteristics of these two forms of aortic aneurysm and the points of which we have to be aware before reaching a final diagnosis. (author)

  6. Regional aortic distensibility and its relationship with age and aortic stenosis: a computed tomography study.

    Science.gov (United States)

    Wong, Dennis T L; Narayan, Om; Leong, Darryl P; Bertaso, Angela G; Maia, Murilo G; Ko, Brian S H; Baillie, Timothy; Seneviratne, Sujith K; Worthley, Matthew I; Meredith, Ian T; Cameron, James D

    2015-06-01

    Aortic distensibility (AD) decreases with age and increased aortic stiffness is independently associated with adverse cardiovascular outcomes. The association of severe aortic stenosis (AS) with AD in different aortic regions has not been evaluated. Elderly subjects with severe AS and a cohort of patients without AS of similar age were studied. Proximal aortic cross-sectional-area changes during the cardiac cycle were determined using retrospective-ECG-gating on 128-detector row computed-tomography. Using oscillometric-brachial-blood-pressure measurements, the AD at the ascending-aorta (AA), proximal-descending-aorta (PDA) and distal-descending-aorta (DDA) was determined. Linear mixed effects modelling was used to determine the association of age and aortic stenosis on regional AD. 102 patients were evaluated: 36 AS patients (70-85 years), 24 AS patients (>85 years) and 42 patients without AS (9 patients DDA (1.1 ± 1.2 vs. 1.2 ± 0.8, P = 0.97). In patients without AS, AD decreased with age in all aortic regions (P < 0.001). The AA in patients <50 years were the most distensible compared to other aortic regions. There is regional variation in aortic distensibility with aging. Patients with aortic stenosis demonstrated regional differences in aortic distensibility with lower distensibility demonstrated in the proximal ascending aorta compared to an age-matched cohort. PMID:25855464

  7. When and how to replace the aortic root in type A aortic dissection.

    Science.gov (United States)

    Leshnower, Bradley G; Chen, Edward P

    2016-07-01

    Management of aortic root pathology during repair of acute type A aortic dissection (TAAD) requires a comprehensive evaluation of the patient's anatomy, demographics, comorbidities and physiologic status at the time of emergent operative intervention. Surgical options include conservative repair of the root (CRR) (with or without replacement of the aortic valve), replacement of the native valve and aortic root using a composite valve-conduit and valve sparing root replacement (VSRR). The primary objective of this review is to provide data for surgeons to aid in their decision-making process regarding management of the aortic root during repair of TAAD. No time or language restrictions were imposed and references of the selected studies were checked for additional relevant citations. Multiple retrospective reviews have demonstrated equivalent operative mortality between aortic root repair and replacement during TAAD. There is a higher incidence of aortic root reintervention with aortic root repair compared to aortic root replacement (ARR). Experienced, high-volume aortic centers have demonstrated the safety of VSRR in young, hemodynamically stable patients presenting with TAAD. In conclusion, aortic root repair can safely be performed in the vast majority of patients with TAAD. Despite the increased surgical complexity, ARR does not increase operative mortality and improves the freedom from root reintervention. VSRR can be performed in highly selected populations of patients with TAAD with durable mid-term valve function. PMID:27563551

  8. [Unicuspid Aortic Valve Stenosis Combined with Aortic Coarctation;Report of a Case].

    Science.gov (United States)

    Kubota, Takehiro; Wakasa, Satoru; Shingu, Yasushige; Matsui, Yoshiro

    2016-06-01

    Unicuspid aortic valve in an adult is extremely rare. In addition, 90% of the patients with aortic coarctation are reported to die before the age 50. A 60-year-old woman was admitted to our hospital for further examination of exertional dyspnea which had begun one year before. She had been under medical treatment for hypertension since early thirties, and had been also diagnosed with moderate aortic stenosis at 50 years of age. She was at 1st diagnosed with aortic coarctation combined with bicuspid aortic valve stenosis. The aortic valve was then found unicuspid and was replaced under cardiopulmonary bypass with perfusion to both the ascending aorta and the femoral artery. Repair of aortic coarctation was performed 3 months later through left thoracotomy without extracorporeal circulation due to the rich collateral circulation. She had no postoperative complications, and hypertension as well as ankle-brachial index improved to the normal levels. PMID:27246132

  9. Whole blood pumping with a microthrottle pump

    OpenAIRE

    Davies, M J; Johnston, I. D.; Tan, C. K. L.; Tracey, M. C.

    2010-01-01

    We have previously reported that microthrottle pumps (MTPs) display the capacity to pump solid phase suspensions such as polystyrene beads which prove challenging to most microfluidic pumps. In this paper we report employing a linear microthrottle pump (LMTP) to pump whole, undiluted, anticoagulated, human venous blood at 200 μl min−1 with minimal erythrocyte lysis and no observed pump blockage. LMTPs are particularly well suited to particle suspension transport by virtue of their relatively ...

  10. Using a Breast Pump

    Science.gov (United States)

    ... you can relax and not be disturbed while pumping. If you have an electric pump, find an ... otherwise irritating your nipple or breast tissue. Begin Pumping If your pump is electric or battery-powered, ...

  11. Magnetic Resonance Imaging of Thoracic Aortic Dissections

    OpenAIRE

    Sax, Steven L.

    1990-01-01

    Magnetic resonance imaging is an excellent noninvasive method for evaluating thoracic aortic dissections. A variety of magnetic resonance scans of aortic dissections are shown, documenting the ability of magnetic resonance to image the true lumen, the false channel, and the intimal septum. Detail is provided on magnetic resonance imaging techniques and findings. (Texas Heart Institute Journal 1990;17:262-70)

  12. Acute aortic dissection in pregnant women.

    Science.gov (United States)

    Yang, Zhaohua; Yang, Shouguo; Wang, Fangshun; Wang, Chunsheng

    2016-05-01

    Acute aortic dissection occurring during pregnancy represents a lethal risk to both the mother and fetus. Management of parturient with acute aortic dissection is complex. We report our experience of two pregnancies with type A acute aortic dissection. One patient is a 31-year-old pregnant woman (33rd gestational week) with a bicuspid aortic valve and the other is a 32-year-old pregnant woman (30th gestational week) with the Marfan syndrome. In both cases, a combined emergency operation consisting of Cesarean section, total hysterectomy prior to corrective surgery for aortic dissection was successfully performed within a relatively short period of time after the onset. Both patients' postoperative recovery was uneventful, and we achieved a favorable maternal and fetal outcome. PMID:25085319

  13. Transcatheter aortic valve replacement in elderly patients

    Institute of Scientific and Technical Information of China (English)

    Dimytri Siqueira; Alexandre Abizaid; Magaly Arrais J.; Eduardo Sousa

    2012-01-01

    Aortic stenosis is the most common native valve disease, affecting up to 5% of the elderly population. Surgical aortic valve replacement reduces symptoms and improves survival, and is the definitive therapy in patients with symptomatic severe aortic stenosis. However, despite the good results of classic surgery, risk is markedly increased in elderly patients with co-morbidities. Transcatheter aortic valve replacement (TAVR) allows implantation of a prosthetic heart valve within the diseased native aortic valve without the need for open heart surgery and cardiopulmonary bypass, offering a new therapeutic option to elderly patients considered at high surgical risk or with contraindications to surgery. To date, several multicenter registries and a randomized trial have confirmed the safety and efficacy of TAVR in those patients. In this chapter, we review the background and clinical applications of TAVR in elderly patients.

  14. Reoperation on aortic disease in patients with previous aortic valve surgery

    Institute of Scientific and Technical Information of China (English)

    SUN Xiao-gang; ZHANG Liang; YU Cun-tao; QIAN Xiang-yang; CHANG Qian

    2013-01-01

    Background Aortic valve replacement (AVR) is a safe and effective method in the treatment of aortic valve diseases.This study aimed to increase the understanding on re-treatment of aortic diseases after aortic valve surgery through a retrospective analysis of 47 related cases.Methods Forty-seven patients (38 males and 9 females) with previous aortic valve surgery have received reoperation on aorta from January 2003 to June 2012,and the mean interval time of re-intervention to aortic disease was 6 years ((6.0± 3.8) years).The secondary aortic surgery included aortic root replacement (14 cases),ascending aorta replacement (10 cases),aortic root/ascending aorta plus total arch replacement with stented elephant trunk implantation (21 cases),and total thoracoabdominal aorta replacement (2 cases).All these patients have received outpatient re-exams or follow-up by phone calls.Results After the initial aortic valve replacement,patients suffered from aortic dissection (25 cases,53%),ascending aortic aneurysm (12 cases,26%) or aortic root aneurysm (10 cases,21%).Diameter in ascending aorta increased (5.2±7.1) mm per year and aortic sinus (3.3±3.1) mm per year.The annual growth value of diameter in ascending aorta was higher in patients with rheumatic heart disease than that in Marfan syndrome (P<0.05).All 47 patients have received reoperation on aorta.One patient died in operating room because aortic dissection seriously involved right coronary artery.Seven patients had renal insufficiency after operation; neurological complications occurred in 14 patients including 7 patients with stroke and the others with transient brain dysfunction.All patients were followed up,the mean survival time was (97.25±17.63) months,95% confidence interval was 55.24-73.33 months.Eight cases were died during follow-up and five-year survival rate was 83%.Conclusion To reduce the aortic adverse events after first aortic valve surgery,it is necessary to actively treat and strictly

  15. Screening for Abdominal Aortic Aneurysm

    OpenAIRE

    Linné, Anneli

    2014-01-01

    Abdominal Aortic Aneurysm (AAA) is a common disease with a prevalence of 1.5-2.0% in 65-year old men in Sweden. The risk of having AAA is increased with smoking, high age, family history of AAA and cardiovascular disease. Women have a lower prevalence (0.5%) and develop AAA later in life. An AAA seldom gives any symptom prior to rupture. Untreated rupture is associated with 100% mortality, while surgically treated rupture is associated with 25-70% mortality. Prophylactic sur...

  16. Sonic Thermometer for High-Altitude Balloons

    Science.gov (United States)

    Bognar, John

    2012-01-01

    The sonic thermometer is a specialized application of well-known sonic anemometer technology. Adaptations have been made to the circuit, including the addition of supporting sensors, which enable its use in the high-altitude environment and in non-air gas mixtures. There is a need to measure gas temperatures inside and outside of superpressure balloons that are flown at high altitudes. These measurements will allow the performance of the balloon to be modeled more accurately, leading to better flight performance. Small thermistors (solid-state temperature sensors) have been used for this general purpose, and for temperature measurements on radiosondes. A disadvantage to thermistors and other physical (as distinct from sonic) temperature sensors is that they are subject to solar heating errors when they are exposed to the Sun, and this leads to issues with their use in a very high-altitude environment

  17. Bicuspid Aortic Valve Disease and Ascending Aortic Aneurysms: Gaps in Knowledge

    Directory of Open Access Journals (Sweden)

    Katie L. Losenno

    2012-01-01

    Full Text Available The bicuspid aortic valve is the most common congenital cardiac anomaly in developed nations. The abnormal bicuspid morphology of the aortic valve results in valvular dysfunction and subsequent hemodynamic derangements. However, the clinical presentation of bicuspid aortic valve disease remains quite heterogeneous with patients presenting from infancy to late adulthood with variable degrees of valvular stenosis and insufficiency and associated abnormalities including aortic coarctation, hypoplastic left heart structures, and ascending aortic dilatation. Emerging evidence suggests that the heterogeneous presentation of bicuspid aortic valve phenotypes may be a more complex matter related to congenital, genetic, and/or connective tissue abnormalities. Optimal management of patients with BAV disease and associated ascending aortic aneurysms often requires a thoughtful approach, carefully assessing various risk factors of the aortic valve and the aorta and discerning individual indications for ongoing surveillance, medical management, and operative intervention. We review current concepts of anatomic classification, pathophysiology, natural history, and clinical management of bicuspid aortic valve disease with associated ascending aortic aneurysms.

  18. Prevalence of De Novo Aortic Valve Insufficiency in Patients After HeartWare VAD Implantation with an Intermittent Low-Speed Algorithm.

    Science.gov (United States)

    Saeed, Diyar; Westenfeld, Ralf; Maxhera, Bujar; Keymel, Stefanie; Sherif, Ahmed; Sadat, Najla; Petrov, GeorGI; Albert, Alexander; Lichtenberg, Artur

    2016-01-01

    De novo aortic valve insufficiency (AI) is a frequent occurrence in patients supported with left ventricular assist device (LVAD). The European version of the HeartWare LVAD has intermittent low-speed software (lavare cycle) to facilitate intermittent aortic valve opening. We examined aortic valve opening status and prevalence of AI in patients supported with HeartWare LVAD and activated lavare cycle. HeartWare LVAD patients were prospectively monitored using serial echocardiograms at different time points after the LVAD implantation. Inclusion criteria were patients with no > mild AI and/or no aortic valve surgery at the time of LVAD implantation and at least 60 days of support. Three of 37 patients had aortic valve surgery and were excluded from the analysis. A total of 34 patients with mean age of 57 ± 12 years met the inclusion criteria. After median support duration of 408 days (77-1250 days), eight patients had trace/mild AI (24%) and one patient developed moderate AI (3%). An average pump flow, speed, and mean arterial pressure of 4.4 ± 0.6 L/min, 2,585 ± 147 rpm, and 88 ± 11 mmHg were documented, respectively. Aortic valve opening was persistently seen in 22 patients (65%). Aortic valve opening is frequent, and the development of > mild AI seems to be rare in patients supported with HeartWare LVAD. PMID:27195744

  19. Comparative in Vitro Research of the Human Aortic Bioprosthesis

    Directory of Open Access Journals (Sweden)

    Dawidowska K.

    2014-12-01

    Full Text Available Evaluate of the usefulness and reliability of structures based on the analysis of recorded parameters determining the flow through the Human Aortic Bioprosthesis (HAB have been dealt with. By flow parameters changes determining the performance environment of prosthesis analyzed change of the motion dynamics of the valve leaflets as a function of pressure, thereby determining the degree of alignment of the prosthesis to the performance conditions. Based on the gathered measurement data a comparative analysis of flow rate valve prostheses for different frequency values of the piston pump imitating the heart, different ejection capacity and pressure conditioning work environment prosthesis were studied. Interpretation of the recorded image gave the basis for determining the Effective Orifice Area (EOC.

  20. Pneumothorax, music and balloons: A case series

    OpenAIRE

    2013-01-01

    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 ...

  1. A Balloon-Gondola Dedicated for Waterlanding

    Science.gov (United States)

    Evrard, J.; Roudil, G.; Catalano, C.; Von Ballmoos, P.

    2015-09-01

    As balloon flights over populated areas are increasingly considered a safety risk, new launch sites are chosen to ensure that sparsely inhabited regions are overflown. Particular vigilance is requested for the selection of the zones where flight termination and landing take place. While open sea would ideally fulfil the safety requirements for flight track and termination, traditional balloon experiments are lost or severely damaged on water landings. EUSO-Balloon, a pathfinder mission for Cosmic-Ray physics, has deliberately been designed as a water-landing gondola as the instrument eventually will observe Energetic Air Showers above open water. In order to maximize the chances for a dry recovery of all the sensitive equipment after a water-landing, the gondola features a number of special devices: inside a watertight capsule using a Fresnel lens as a porthole, the electronics is mounted on a ‘dry-shelf' with limber holes (drain holes). Also, the entire capsule is held above the waterline by a collar of floaters. To minimize damage to the payload and warrant the integrity of the leak-tight capsule at splashdown, efficient deceleration is achieved by using the instruments optical baffle (nadir-pointing) as a cylinder; the pressure of the air-cushion in the enclosed volume being passively controlled by calibrated evacuation-holes. Upon its maiden flight of August 25, 2014 from Timmins, Ontario, EUSO-Balloon not only accomplished its science goals, but it also accidentally landed in a small lake, validating the water-landing capacity it was designed for.

  2. Giant Thoracic Aneurysm Following Valve Replacement for Bicuspid Aortic Valve.

    Science.gov (United States)

    Tran, Cao; Ul Haq, Ehtesham; Nguyen, Ngoc; Omar, Bassam

    2015-01-01

    Bicuspid aortic valve is a common congenital anomaly associated with aortopathy, which can cause aortic root dilatation, necessitating regular screening if the aortic root is > 4.0 cm. Despite the low absolute incidence of aortic complications associated with bicuspid aortic valve in the general population, the consequences of such complications for an individual patient can be devastating. Herein we propose a balanced algorithm that incorporates recommendations from the three major guidelines for follow-up imaging of the aortic root and ascending thoracic aorta in patients with a bicuspid aortic valve, maintaining the current recommendations with regard to surgical thresholds. PMID:26827748

  3. Lightweight Reusable Solar Array For Balloons

    Science.gov (United States)

    Aaron, K.; Tensor, P.; Nock, K.; Wyszkowski, C.

    We will discuss a new lightweight reusable solar array system, dubbed HighPower, which is being developed for the Ultra-Long Duration Balloon (ULDB) program using NASA/SBIR funding, but which is also applicable to other balloon systems. The system uses a vertically deployed stack of panels suspended from their corners by cables. The stack act likes a two-dimensional Venetian blind. By raising and lowering opposite corners, the array of parallel panels can be pointed over most of the upper hemisphere. This allows the panels to remain normal to the sun despite the slow rotation of the gondola and without requiring rotation of the system (no slip rings) or heavy cantilevered rotation joints. The system is sized to generate 2000 W using six 2m x 2m panels. The modularity of the system allows panels to be added or removed to tailored the power to the needs of the mission. Prior to cut -down of the balloon, the panels can be retracted and stowed compactly in the lower part of the gondola. This will protect the array during landing, allowing the array to be reused on subsequent flights.

  4. 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.

  5. MAXIS Balloon Observations of Electron Microburst Precipitation

    Science.gov (United States)

    Millan, R. M.; Hunter, A. E.; McCarthy, M. P.; Lin, R. P.; Smith, D. M.

    2003-12-01

    Quantifying and understanding losses is an integral part of understanding relativistic electron variability in the radiation belts. SAMPEX observations indicate that electron microburst precipitation is a major loss mechanism during active periods; the loss of relativistic electrons during a six hour period due to microburst precipitation was recently estimated to be comparable to the total number of trapped electrons in the outer zone (Lorentzen et al., 2001). Microburst precipitation was first observed from a balloon (Anderson and Milton, 1964), but these early measurements were only sensitive to MAXIS 2000 long duration balloon campaign. MAXIS was launched from McMurdo Station in Antarctica carrying a germanium spectrometer, a BGO scintillator and two X-ray imagers designed to measure the bremsstrahlung produced by precipitating electrons. The balloon circumnavigated the south pole in 18 days covering magnetic latitudes ranging from 58o-90o South. During the week following a moderate geomagnetic storm (with Dst reaching -91 nT), MAXIS detected a total of over 16 hours of microburst precipitation. We present high resolution spectra obtained with the MAXIS germanium spectrometer which allow us to determine the precipitating electron energy distribution. The precipitating distribution will then be compared to the trapped distribution measured by the GPS and LANL satellites. We also examine the spatial distribution of the precipitation.

  6. Dynamic heart phantom with functional mitral and aortic valves

    Science.gov (United States)

    Vannelli, Claire; Moore, John; McLeod, Jonathan; Ceh, Dennis; Peters, Terry

    2015-03-01

    Cardiac valvular stenosis, prolapse and regurgitation are increasingly common conditions, particularly in an elderly population with limited potential for on-pump cardiac surgery. NeoChord©, MitraClipand numerous stent-based transcatheter aortic valve implantation (TAVI) devices provide an alternative to intrusive cardiac operations; performed while the heart is beating, these procedures require surgeons and cardiologists to learn new image-guidance based techniques. Developing these visual aids and protocols is a challenging task that benefits from sophisticated simulators. Existing models lack features needed to simulate off-pump valvular procedures: functional, dynamic valves, apical and vascular access, and user flexibility for different activation patterns such as variable heart rates and rapid pacing. We present a left ventricle phantom with these characteristics. The phantom can be used to simulate valvular repair and replacement procedures with magnetic tracking, augmented reality, fluoroscopy and ultrasound guidance. This tool serves as a platform to develop image-guidance and image processing techniques required for a range of minimally invasive cardiac interventions. The phantom mimics in vivo mitral and aortic valve motion, permitting realistic ultrasound images of these components to be acquired. It also has a physiological realistic left ventricular ejection fraction of 50%. Given its realistic imaging properties and non-biodegradable composition—silicone for tissue, water for blood—the system promises to reduce the number of animal trials required to develop image guidance applications for valvular repair and replacement. The phantom has been used in validation studies for both TAVI image-guidance techniques1, and image-based mitral valve tracking algorithms2.

  7. Quadricuspid aortic valve with ruptured sinus of Valsalva.

    Science.gov (United States)

    Akerem Khan, Shamruz Khan; Tamin, Syahidah Syed; Burkhart, Harold M; Araoz, Philip A; Young, Phillip M

    2013-02-01

    We present a case of a 24-year-old woman who was diagnosed with quadricuspid aortic valve with ruptured sinus of Valsalva. Quadricuspid aortic valve is a rare congenital cardiac anomaly. The recognition of quadricuspid aortic valve has clinical significance as it causes aortic valve dysfunction, and is often associated with other congenital cardiac abnormalities. We showed the important role of multimodality imaging in diagnosing a quadricuspid aortic valve associated with ruptured sinus of Valsalva. PMID:22874066

  8. Design of a cost-effective, hemodynamically adjustable model for resuscitative endovascular balloon occlusion of the aorta (REBOA) simulation.

    Science.gov (United States)

    Keller, Benjamin A; Salcedo, Edgardo S; Williams, Timothy K; Neff, Lucas P; Carden, Anthony J; Li, Yiran; Gotlib, Oren; Tran, Nam K; Galante, Joseph M

    2016-09-01

    Resuscitative endovascular balloon occlusion of the aorta (REBOA) is an adjunct technique for salvaging patients with noncompressible torso hemorrhage. Current REBOA training paradigms require large animals, virtual reality simulators, or human cadavers for acquisition of skills. These training strategies are expensive and resource intensive, which may prevent widespread dissemination of REBOA. We have developed a low-cost, near-physiologic, pulsatile REBOA simulator by connecting an anatomic vascular circuit constructed out of latex and polyvinyl chloride tubing to a commercially available pump. This pulsatile simulator is capable of generating cardiac outputs ranging from 1.7 to 6.8 L/min with corresponding arterial blood pressures of 54 to 226/14 to 121 mmHg. The simulator accommodates a 12 French introducer sheath and a CODA balloon catheter. Upon balloon inflation, the arterial waveform distal to the occlusion flattens, distal pulsation within the simulator is lost, and systolic blood pressures proximal to the balloon catheter increase by up to 62 mmHg. Further development and validation of this simulator will allow for refinement, reduction, and replacement of large animal models, costly virtual reality simulators, and perfused cadavers for training purposes. This will ultimately facilitate the low-cost, high-fidelity REBOA simulation needed for the widespread dissemination of this life-saving technique. PMID:27270855

  9. Imaging of thoracic aortic dissection

    International Nuclear Information System (INIS)

    Acute thoracic aortic dissection has a high mortality rate if untreated, so the diagnosis must be rapidly made. Multiple imaging techniques are often used. This retrospective study from 1988 to 1993 assesses the usefulness in diagnosis of chest X-rays, computed tomography (CT) scanning, aortography, magnetic resonance imaging (MRI), trans-thoracic (TTE) and trans-oesophageal (TOE) echocardiography. Forty-two patients with a final clinical diagnosis of dissection were studied. The diagnosis was confirmed in 16 (13 at surgery and three at autopsy). Three died with dissection given as the only cause of death. Chest X-ray abnormalities were seen in all 19 patients with surgery or death from dissection, with a widened mediastinum and/or dilated aorta being present in 17. In the group of 16 patients with surgery or autopsy proof, CT scans found dissections in 9 out of 12 patients studied and correctly classified the type in only five. Aortography was preformed in five, with accurate depiction of dissection and type in all. TTE found dissections in three of eight patients imaged by this method. MRI and TOE were preformed each on two patients, with accurate depiction of dissection and type in each. Because of the relatively low sensitivity of CT scanning in defining aortic dissections Westmead Hospital is currently assessing the use of TOE as the prime imaging modality prior to surgical intervention. 17 refs., 4 tabs., 4 figs

  10. Aortic reconstruction with bovine pericardial grafts

    Directory of Open Access Journals (Sweden)

    Silveira Lindemberg Mota

    2003-01-01

    Full Text Available INTRODUCTION: Glutaraldehyde-treated crimped bovine pericardial grafts are currently used in aortic graft surgery. These conduits have become good options for these operations, available in different sizes and shapes and at a low cost. OBJECTIVE:To evaluate the results obtained with bovine pericardial grafts for aortic reconstruction, specially concerning late complications. METHOD: Between January 1995 and January 2002, 57 patients underwent different types of aortic reconstruction operations using bovine pericardial grafts. A total of 29 (50.8% were operated on an urgent basis (mostly acute Stanford A dissection and 28 electively. Thoracotomy was performed in three patients for descending aortic replacement (two patients and aortoplasty with a patch in one. All remaining 54 underwent sternotomy, cardiopulmonary bypass and aortic resection. Deep hypothermia and total circulatory arrest was used in acute dissections and arch operations. RESULTS: Hospital mortality was 17.5%. Follow-up was 24.09 months (18.5 to 29.8 months confidence interval and complication-free actuarial survival curve was 92.3% (standard deviation ± 10.6. Two patients lately developed thoracoabdominal aneurysms following previous DeBakey II dissection and one died from endocarditis. One "patch" aortoplasty patient developed local descending aortic pseudoaneurysm 42 months after surgery. All other patients are asymptomatic and currently clinically evaluated with echocardiography and CT scans, showing no complications. CONCLUSION: Use of bovine pericardial grafts in aortic reconstruction surgery is adequate and safe, with few complications related to the conduits.

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

    International Nuclear Information System (INIS)

    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

  12. 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.

  13. Valvular Aortic Stenosis: A Proteomic Insight

    Directory of Open Access Journals (Sweden)

    Fernando Vivanco

    2010-02-01

    Full Text Available Calcified aortic valve disease is a slowly progressive disorder that ranges from mild valve thickening with no obstruction of blood flow, known as aortic sclerosis, to severe calcification with impaired leaflet motion or aortic stenosis. In the present work we describe a rapid, reproducible and effective method to carry out proteomic analysis of stenotic human valves by conventional 2-DE and 2D-DIGE, minimizing the interference due to high calcium concentrations. Furthermore, the protocol permits the aortic stenosis proteome to be analysed, advancing our knowledge in this area. Summary: Until recently, aortic stenosis (AS was considered a passive process secondary to calcium deposition in the aortic valves. However, it has recently been highlighted that the risk factors associated with the development of calcified AS in the elderly are similar to those of coronary artery disease. Furthermore, degenerative AS shares histological characteristics with atherosclerotic plaques, leading to the suggestion that calcified aortic valve disease is a chronic inflammatory process similar to atherosclerosis. Nevertheless, certain data does not fit with this theory making it necessary to further study this pathology. The aim of this study is to develop an effective protein extraction protocol for aortic stenosis valves such that proteomic analyses can be performed on these structures. In the present work we have defined a rapid, reproducible and effective method to extract proteins and that is compatible with 2-DE, 2D-DIGE and MS techniques. Defining the protein profile of this tissue is an important and challenging task that will help to understand the mechanisms of physiological/pathological processes in aortic stenosis valves.

  14. First transcatheter aortic valve implantation for severe pure aortic regurgitation in Asia

    OpenAIRE

    Chiam, Paul Toon-Lim; Ewe, See Hooi; Chua, Yeow Leng; Lim, Yean Teng

    2014-01-01

    Transcatheter aortic valve implantation (TAVI) has become the standard of care for inoperable patients with symptomatic severe aortic stenosis (AS), and an alternative to open aortic valve replacement for patients at high surgical risk. TAVI has also been performed in several groups of patients with off-label indications such as severe bicuspid AS, and as a valve-in-valve therapy for a degenerated surgical bioprosthesis. Although TAVI with CoreValve® prosthesis is technically challenging, and...

  15. Anatomics Knowledges of Aortic Root in the Transcatheter Aortic Valve Implantation.

    OpenAIRE

    Marcelo Cerezo; Omar Bertani; Gisela Panciroli; Sebastián Duhalde; Karina Ferreira; Luciano Honaine

    2010-01-01

    The Aortic Valve is a valvular system that bears different high pressure forces. It takes part of a complex structure called Aortic Root. Nowadays, anatomic knowledge has taken a preponderant role, due to the use of the Transcatether Aortic Valve Implant (TAVI). To describe the patient´s characteristics which exclude them of the TAVI for anatomic reasons in cadaveric dissections and transthoracic echocardiograms. A descriptive retrospective analysis of 67 individuals was performed and divided...

  16. Fluoroscopically Guided Balloon Dilation for Postintubation Tracheal Stenosis

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Woong Hee; Kim, Jin Hyoung, E-mail: m1fenew@daum.net; Park, Jung-Hun [University of Ulsan College of Medicine, Department of Radiology and Research Institute of Radiology, Asan Medical Center (Korea, Republic of)

    2013-10-15

    Purpose: Little was known about the safety and long-term efficacy of fluoroscopically guided balloon dilation for postintubation tracheal stenosis. The purpose of this study was to evaluate the safety and long-term efficacy of fluoroscopically guided balloon dilation in patients with postintubation tracheal stenosis. Methods: From February 2000 to November 2010, 14 patients underwent fluoroscopically guided balloon dilation for postintubation tracheal stenosis. Technical success, clinical success, and complications were evaluated. Patients were followed up for recurrent symptoms. Results: In all patients, fluoroscopically guided balloon dilation was technically and clinically successful with no major complications. Following the initial procedure, six patients (43 %) remained asymptomatic during a follow-up period. Obstructive symptoms recurred in eight patients (57 %) within 6 months (mean, 1.7 months), who were treated with repeat balloon dilation (n = 4) and other therapies. Of the four patients who underwent repeat balloon dilation, three became asymptomatic. One patient became asymptomatic after a third balloon dilation. On long-term (mean, 74 months) follow-up, 71 % of patients experienced relief of symptoms following fluoroscopically guided balloon dilation. Conclusions: Fluoroscopically guided balloon dilation may be safe, is easy to perform, and resulted in effective treatment in patients with postintubation tracheal stenosis.

  17. Acoustical characterization of exploding hydrogen-oxygen balloons.

    Science.gov (United States)

    Vernon, Julia A; Gee, Kent L; Macedone, Jeffrey H

    2012-03-01

    Exploding hydrogen-oxygen balloons are popular chemistry demonstrations. Although initial research experimentally quantified potential hearing risk via analysis of peak levels [K. L. Gee et al., J. Chem. Educ. 87, 1039-1044 (2010)], further waveform and spectral analyses have been conducted to more fully characterize these impulsive noise sources. While hydrogen-only balloons produce inconsistent reactions and relatively low, variable levels, stoichiometrically mixed hydrogen-oxygen balloons produce consistent high-amplitude noise waveforms. Preliminary consideration is also given to the potential use of these exploding balloons in architectural acoustics applications. PMID:22423815

  18. The role of scientific ballooning for exploration of the magnetosphere

    International Nuclear Information System (INIS)

    The magnetosphere is explored in situ by satellites, but measurements near the low altitude magnetospheric boundary by rockets, balloons and groundbased instruments play a very significant role. The geomagnetic field provides a frame with anisotropic wave and particle propagation effects, enabling remote sensing of the distant magnetosphere by means of balloon-borne and groundbased instruments. Examples will be given of successful studies, with coordinated satellite and balloon observations, of substorm, pulsation and other phenomena propagating both along and across the geomagnetic field. Continued efforts with sophisticated balloon-borne instrumentations should contribute substantially to our understanding of magnetospheric physics. (Author)

  19. Emergency Transcatheter Aortic Valve Implantation for Acute and Early Failure of Sutureless Perceval Aortic Valve.

    Science.gov (United States)

    Durand, Eric; Tron, Christophe; Eltchaninoff, Hélène

    2015-09-01

    We report the case of a 78-year-old woman admitted for cardiogenic shock related to acute and early failure (severe aortic regurgitation) of a Perceval sutureless aortic bioprosthesis (Sorin Group, Saluggia, Italy). Clinical stability was achieved using rescue transfemoral transcatheter aortic valve-in-valve implantation with an Edwards SAPIEN 3 prosthesis (Edwards Lifesciences, Irvine, CA). To our knowledge, we report herein the first case of successful valve-in-valve implantation using a SAPIEN 3 transcatheter heart valve in a sutureless bioprosthetic aortic valve with acute and early deterioration. PMID:26095935

  20. Left ventricular diastolic function in valvular aortic stenosis after aortic valve replacement

    Directory of Open Access Journals (Sweden)

    Ristić-Anđelkov Anđelka

    2002-01-01

    Full Text Available In adults with significant sympthomatic aortic valve stenosis, aortic valve replacement is therapy of choice. Replacement of the diseased aortic valve with a prosthetic valve yields relief of left ventricular outflow obstruction. Myocardial remodeling with regression of mass transpires as the heart adapts to the new level of after load. In patients with moderate left ventricular hypertrophy improvement in diastolic function during the first year after aortic valve replacement is visible, while in patients with extreme myocardial hypertrophic changes it was slower.

  1. Stroke Volume estimation using aortic pressure measurements and aortic cross sectional area: Proof of concept.

    Science.gov (United States)

    Kamoi, S; Pretty, C G; Chiew, Y S; Pironet, A; Davidson, S; Desaive, T; Shaw, G M; Chase, J G

    2015-08-01

    Accurate Stroke Volume (SV) monitoring is essential for patient with cardiovascular dysfunction patients. However, direct SV measurements are not clinically feasible due to the highly invasive nature of measurement devices. Current devices for indirect monitoring of SV are shown to be inaccurate during sudden hemodynamic changes. This paper presents a novel SV estimation using readily available aortic pressure measurements and aortic cross sectional area, using data from a porcine experiment where medical interventions such as fluid replacement, dobutamine infusions, and recruitment maneuvers induced SV changes in a pig with circulatory shock. Measurement of left ventricular volume, proximal aortic pressure, and descending aortic pressure waveforms were made simultaneously during the experiment. From measured data, proximal aortic pressure was separated into reservoir and excess pressures. Beat-to-beat aortic characteristic impedance values were calculated using both aortic pressure measurements and an estimate of the aortic cross sectional area. SV was estimated using the calculated aortic characteristic impedance and excess component of the proximal aorta. The median difference between directly measured SV and estimated SV was -1.4ml with 95% limit of agreement +/- 6.6ml. This method demonstrates that SV can be accurately captured beat-to-beat during sudden changes in hemodynamic state. This novel SV estimation could enable improved cardiac and circulatory treatment in the critical care environment by titrating treatment to the effect on SV. PMID:26736434

  2. The role of aortic wall CT attenuation measurements for the diagnosis of acute aortic syndromes

    International Nuclear Information System (INIS)

    Objectives: To determine if measurements of aortic wall attenuation can improve the CT diagnosis of acute aortic syndromes. Methods: CT reports from a ten year period were searched for acute aortic syndromes (AAS). Studies with both an unenhanced and a contrast enhanced (CTA) series that had resulted in the diagnosis of intramural hematoma (IMH) were reviewed. Diagnoses were confirmed by medical records. The attenuation of aortic wall abnormalities was measured. The observed attenuation threshold was validated using studies from 39 new subjects with a variety of aortic conditions. Results: The term “aortic dissection” was identified in 1206, and IMH in 124 patients’ reports. IMH was confirmed in 31 patients, 21 of whom had both unenhanced and contrast enhanced images. All 21 had pathologic CTA findings, and no CTA with IMH was normal. Attenuation of the aortic wall was greater than 45 HUs on the CTA images in all patients with IMH. When this threshold was applied to the new group, sensitivity for diagnosing AAS was 100% (19/19), and specificity 94% (16/17). Addition of unenhanced images did not improve accuracy. Conclusions: Measurements of aortic wall attenuation in CTA have a high negative predictive value for the diagnosis of acute aortic syndromes

  3. Pump characteristics and applications

    CERN Document Server

    Volk, Michael

    2013-01-01

    Providing a wealth of information on pumps and pump systems, Pump Characteristics and Applications, Third Edition details how pump equipment is selected, sized, operated, maintained, and repaired. The book identifies the key components of pumps and pump accessories, introduces the basics of pump and system hydraulics as well as more advanced hydraulic topics, and details various pump types, as well as special materials on seals, motors, variable frequency drives, and other pump-related subjects. It uses example problems throughout the text, reinforcing the practical application of the formulae

  4. Spontaneous perforation of a syphilitic aneurysm of the aortic arch into the pulmonary artery

    International Nuclear Information System (INIS)

    An aortopulmonary fistula in case of a bag-shaped aneurysm of the aortic arch is demonstrated via angiography. A diagnosis to the effect that the existence of this phenomenon is suspected, can already be arrived at when examining the plain radiography of the thorax. We can say that a sign of an aortopulmonary fistula is represented, in case of an aneurysm of the aorta ascendens and of the arcus aortae, by the existence of a left-right shunt with hypercirculation in the pulmonary circulation, in most cases also signs of right ventricular insufficiency. This is often combined with a typical previous history of sudden dyspnoeas and thoracic pain. The article points out the theoretical possibility of balloon catheter occlusion of the fistula to relieve the acute right ventricular load. (orig.)

  5. Medical image of the week: aortic ring

    Directory of Open Access Journals (Sweden)

    Wong C

    2014-10-01

    Full Text Available No abstract available. Article truncated after 150 words. A 78 year old man presented with altered mental status and was found to have an intraventricular hemorrhage. He was intubated for airway protection. On the post-intubation chest radiograph (Figure 1, the patient was noted to have a widening of the right paratracheal stripe. A CT chest (Figure 2 was obtained to characterize this finding and revealed an aortic ring which encircles the trachea and esophagus. Vascular rings are uncommon congenital abnormalities, accounting for approximately 1% of congenital heart disease. Complete vascular rings can occur with a right aortic arch with a ligamentum arteriosum or with a double aortic arch, such as with our patient (1. This ring can cause airway compression, stridor, esophageal compression, or no symptoms at all. As the embryo develops, the left fourth pharyngeal arch normally persists to become the aortic arch while the right fourth pharyngeal arch regresses. If both fourth pharyngeal arches persist, a ...

  6. Congenital anomalies of aortic arch: CT angiography

    Energy Technology Data Exchange (ETDEWEB)

    Moon, Yung; Kim, Yang Min; Kim, Tae Hoon; Kim, Mi Young [Sejong General hospial, Seoul (Korea, Republic of); Lee, Jae Young [Seoul National Univ. College of Medicine, Seoul (Korea, Republic of); Kim, Hyung Seok [Cheju Medical Center, Cheju (Korea, Republic of)

    2001-01-01

    Aortic arch anomalies result from the failure of an embryonic vascular structure to persists and regress in the usual manner during formation of the aortic arch. The anomalous aortic arch may encircle and compress the trachea and esophagus as a form of a vascular ring. The diagnosis of aortic arch anomaly and the recognition of airway compression are important because they are conditions which complicate the natural and surgical course of related diseases. CT can demonstrate the nature of anatomic structures such as thr treachea and esophagus not revealed by angiogrphy, simultaneosuly disclosing the relationship of stenotic airways and offending mediastinal vessels. Volumetric data acquisition by means of spiral CT enables three dimensional reconstruction, which can provide easy global understanding for the complex anatomy and spatial relationship of airway and cardiovascular structures. Three dimensional imaging is very useful for the physician and surgeon who are not accustomed to mentally reconstructing axial images, and can facilitate surgical planning.

  7. A rare cause of recurrent aortic dissection.

    Science.gov (United States)

    Agrawal, Yashwant; Gupta, Vishal

    2016-07-01

    We report the case of a 19-year-old man with a history of Loeys-Dietz syndrome (LDS), which was diagnosed when he had a Stanford type A aortic dissection. He also had multiple aneurysms including ones in the innominate, right common carotid, and right internal mammary arteries. He had had multiple procedures including Bentall's procedure, repeat sternotomy with complete arch and valve replacement, and coil embolization of internal mammary artery aneurysm in the past. His LDS was characterized by gene mutation for transforming growth factor-β receptor 1. He presented to our facility with sudden onset of back pain, radiating to the right shoulder and chest. He was diagnosed with Stanford type B aortic dissection and underwent thoracic aorta endovascular repair for his aortic dissection. This case represents the broad spectrum of pathology associated with LDS where even with regular surveillance and aggressive medical management the patient developed Stanford B aortic dissection. PMID:27358537

  8. Dissecting aortic aneurysm in maintenance hemodialysis patients

    Directory of Open Access Journals (Sweden)

    Ounissi M

    2009-01-01

    Full Text Available The dissecting aortic aneurysm (DAA is a rare pathology that may result in fatal outcome. We report follow up of three cases of DAA patients undergoing maintenance hemo-dialysis who were managed conservatively.

  9. A rare cause of recurrent aortic dissection

    Directory of Open Access Journals (Sweden)

    Yashwant Agrawal

    2016-07-01

    Full Text Available We report the case of a 19-year-old man with a history of Loeys–Dietz syndrome (LDS, which was diagnosed when he had a Stanford type A aortic dissection. He also had multiple aneurysms including ones in the innominate, right common carotid, and right internal mammary arteries. He had had multiple procedures including Bentall’s procedure, repeat sternotomy with complete arch and valve replacement, and coil embolization of internal mammary artery aneurysm in the past. His LDS was characterized by gene mutation for transforming growth factor-β receptor 1. He presented to our facility with sudden onset of back pain, radiating to the right shoulder and chest. He was diagnosed with Stanford type B aortic dissection and underwent thoracic aorta endovascular repair for his aortic dissection. This case represents the broad spectrum of pathology associated with LDS where even with regular surveillance and aggressive medical management the patient developed Stanford B aortic dissection.

  10. CT diagnosis of aortic graft infections

    International Nuclear Information System (INIS)

    Two cases of aortic graft infections diagnosed by computed tomography (CT) are presented. CT scans demonstrated a zone of low attenuation in the perigraft area, in one case with a rim enhancement. The diagnoses were verfied by operation. (orig.)

  11. Surveillance intervals for small abdominal aortic aneurysms

    DEFF Research Database (Denmark)

    Bown, Matthew J; Sweeting, Michael J; Brown, Louise C;

    2013-01-01

    Small abdominal aortic aneurysms (AAAs [3.0 cm-5.4 cm in diameter]) are monitored by ultrasound surveillance. The intervals between surveillance scans should be chosen to detect an expanding aneurysm prior to rupture....

  12. Aortic aneurysm secondary to umbilical artery catheterization

    International Nuclear Information System (INIS)

    A 14-month-girl presented with an asymptomatic posterior mediastinal mass. She had a history of prematurity, umbilical artery catheterization, and sepsis. The diagnosis of aortic aneurysm was made by dynamic computed tomography. The aneurysm was successfully resected. (orig.)

  13. 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

  14. Stratospheric Balloons for Planetary Science and the Balloon Observation Platform for Planetary Science (BOPPS) Mission Summary

    Science.gov (United States)

    Kremic, Tibor; Cheng, Andrew F.; Hibbitts, Karl; Young, Eliot F.; Ansari, Rafat R.; Dolloff, Matthew D.; Landis, Rob R.

    2015-01-01

    NASA and the planetary science community have been exploring the potential contributions approximately 200 questions raised in the Decadal Survey have identified about 45 topics that are potentially suitable for addressing by stratospheric balloon platforms. A stratospheric balloon mission was flown in the fall of 2014 called BOPPS, Balloon Observation Platform for Planetary Science. This mission observed a number of planetary targets including two Oort cloud comets. The optical system and instrumentation payload was able to provide unique measurements of the intended targets and increase our understanding of these primitive bodies and their implications for us here on Earth. This paper will discuss the mission, instrumentation and initial results and how these may contribute to the broader planetary science objectives of NASA and the scientific community. This paper will also identify how the instrument platform on BOPPS may be able to contribute to future balloon-based science. Finally the paper will address potential future enhancements and the expected science impacts should those enhancements be implemented.

  15. Anesthetic management of transcatheter aortic valve implantation

    OpenAIRE

    Annalisa Franco; Chiara Gerli; Laura Ruggeri; Fabrizio Monaco

    2012-01-01

    Transcatheter aortic valve implantation (TAVI) is an emergent technique for high-risk patients with aortic stenosis. TAVI poses significant challenges about its management because of the procedure itself and the population who undergo the implantation. Two devices are currently available and marketed in Europe and several other technologies are being developed. The retrograde transfemoral approach is the most popular procedure; nevertheless, it may not be feasible in patients with significant ...

  16. Effect of age on aortic atherosclerosis

    Institute of Scientific and Technical Information of China (English)

    Michael A. Chen; Miwa Kawakubo; Patrick M. Colletti; Dongxiang Xu; Laurie LaBree Dustin; Robert Detrano; Stanley P Azen; Nathan D. Wong; Xue-Qiao Zhao

    2013-01-01

    Objective To examine the association of atherosclerosis burden in the survivors of an asymptomatic elderly cohort study and its relationship to other coronary risk factors (specifically, age) by evaluating aortic atherosclerotic wall burden by magnetic resonance imaging (MRI). Methods A total of 312 participants in an ongoing observational cohort study underwent cardiac and descending thoracic aorta imaging by MRI. Maximum wall thickness was measured and the mean wall thickness calculated. Wall/outer wall ratio was used as a normalized wall index (NWI) adjusted for artery size difference among participants. Percent wall volume (PWV) was calculated as NWI × 100. Results In this asymptomatic cohort (mean age: 76 years), the mean (SD) aortic wall area and wall thickness were 222 ± 45 mm2 and 2.7 ± 0.4 mm, respectively. Maximum wall thickness was 3.4 ± 0.6 mm, and PWV was 32% ± 4%. Women appeared to have smaller wall area, but after correcting for their smaller artery size, had significantly higher PWV than men (P = 0.03). Older age was associated with larger wall area (P = 0.04 for trend) with similar PWVs. However, there were no statistically significant associations between standard risk factors, Framingham global risk, or metabolic syndrome status, therapy for cholesterol or hypertension, coronary or aortic calcium score, and the aortic wall burden. Aortic calcification was associated with coronary calcification. Conclusions Asymptomatic elderly in this cohort had a greater descending thoracic aortic wall volume that correlated with age, and women had a significantly increased PWV compared to men. In these survivors, the atherosclerotic aortic wall burden was not significantly associated with traditional risk factors or with coronary or aortic calcium scores or coronary calcium progression. Results suggest that age, or as yet unidentified risk factor(s), may be responsible for the increase in atherosclerosis.

  17. Glucose Suppresses Biological Ferroelectricity in Aortic Elastin

    OpenAIRE

    Liu, Yuanming; WANG, YUNJIE; Chow, Ming-Jay; Chen, Nataly Q.; Ma, Feiyue; Zhang, Yanhang; Li, Jiangyu

    2013-01-01

    Elastin is an intriguing extracellular matrix protein present in all connective tissues of vertebrates, rendering essential elasticity to connective tissues subjected to repeated physiological stresses. Using piezoresponse force microscopy, we show that the polarity of aortic elastin is switchable by an electrical field, which may be associated with the recently discovered biological ferroelectricity in the aorta. More interestingly, it is discovered that the switching in aortic elastin is la...

  18. Aortic dissection. Basic aspects and endovascular management

    International Nuclear Information System (INIS)

    Treatment of thoracic aortic pathology is complicated by the morbidity associated to the surgical procedure and to the frailty of an elderly and difficult population. Surgical operation in this kind of population frequently bears a significant incidence of death and long-term disability. In an effort to reduce the incidence of negative outcomes, minimally invasive techniques in the form of endovascular stenting have been introduced during the past decade. The technology, originally described by Parodi, and initially designed for its use in abdominal aortic aneurysms, has been adapted for the treatment of thoracic aortic aneurysms. Furthermore, an improved understanding of the pathophysiology and the natural history of thoracic aortic disease as well as the analysis of the outcomes have facilitated our treatment decisions in terms of the timing for an appropriate intervention. Treatment of thoracic aortic dissection using endovascular Stent is one of the more recent advances in this condition and is receiving increasing attention, as it is a less invasive alternative to an open surgical repair. Although this technology is still innovative, significant improvements have been made lately in the design and deployment of the endovascular Stent-grafts. These prostheses have been increasingly used to treat aneurysms, dissections and traumatic ruptures, as well as giant penetrating ulcers and intramural hematomas of the descending thoracic aorta with good early and mid-term outcomes. The rareness, complexity and severity of the pathology and the theoretically high risk of complications should render the surgeon extremely cautious especially with young patients. Conceptually, the endo luminal treatment in the acute phase seems to be the solution and will probably become a preferred therapy while technical refinement is under way. Worldwide experience is growing and with this a better understanding of the indications and limitations of this innovative therapy will be

  19. Ballooning Spiders: The Case for Electrostatic Flight

    CERN Document Server

    Gorham, Peter W

    2013-01-01

    We consider general aspects of the physics underlying the flight of Gossamer spiders, also known as ballooning spiders. We show that existing observations and the physics of spider silk in the presence of the Earth's static atmospheric electric field indicate a potentially important role for electrostatic forces in the flight of Gossamer spiders. A compelling example is analyzed in detail, motivated by the observed "unaccountable rapidity" in the launching of such spiders from H.M.S. Beagle, recorded by Charles Darwin during his famous voyage.

  20. Thrombus aspiration catheter is a Dottering balloon.

    Science.gov (United States)

    Sheshagiri Rao, D; Barik, Ramachandra; Prasad, Akula Siva

    2016-01-01

    Coronary angiogram in a young man with history of STEMI with delayed presentation revealed subtotal occlusion of left anterior descending artery (LAD) with large thrombotic filling defect distal to the critical lesion. PCI was preferred without delay because of ongoing chest pain. Several runs of thrombus aspiration failed to detect any visible thrombus. However, the immediate angiogram after thrombus aspiration showed complete distal embolization of the thrombus which could have been achieved by Dottering or balloon dilatation. In contrary to the general perception, does thrombus aspiration push more thrombus than it can aspirate? PMID:27543477

  1. Ballooning instability precursors to high β disruptions

    International Nuclear Information System (INIS)

    Strongly ballooning modes have been found as precursors to high β disruptions on TFTR. The modes are typically localized to a region spanning about 60 degree in the toroidal direction. The toroidal localization is associated with lower frequency, global Magneto-Hydro-Dynamic (MHD) activity, typically an ideal n = 1 kink mode. They have moderate to high frequency (f = 10--20 frot), implying toroidal mode numbers in the range n = 10--20. The growth rates for the modes are large, of order 104/sec

  2. General theory of kinetic ballooning modes

    International Nuclear Information System (INIS)

    The ballooning mode formalism, previously developed for the ideal MHD problem, is applied here to the kinetic problem in tokamaks. The general two-dimensional equation governing drift and trapped-electron eigenmodes reduces to a one-dimensional integral equation along the lines of force with the radial structure determined by a WKB procedure. Comparisons made between the present one-dimensional code and a previous two-dimensional code embodying identical physical assumptions indicate reasonable agreement. This correspondence holds both for the structure along the field line and for the radial structure in the special case of closely spaced turning points

  3. 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...... of patients for DBE a pivotal point. The mainstay of this screening examination of the small bowel is capsule endoscopy (CE). The aim of this study was to describe the results of this screening procedure and the subsequent DBE in patients with suspected mid-gastrointestinal bleeding (MGIB). Material...

  4. 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.

  5. Pneumothorax, music and balloons: A case series.

    Science.gov (United States)

    Dejene, Shiferaw; Ahmed, Fahim; Jack, Kastelik; Anthony, Arnorld

    2013-07-01

    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. PMID:23922614

  6. Explosive Ballooning Flux Tubes in Tokamaks

    CERN Document Server

    Ham, C J; Brochard, G; Wilson, H R

    2016-01-01

    Tokamak stability to, potentially explosive, `ballooning' displacements of elliptical magnetic flux tubes is examined in large aspect ratio equilibrium. Above a critical pressure gradient the energy stored in the plasma may be lowered by finite (but not infinitesimal) displacements of such tubes (metastability). Above a higher pressure gradient, the linear stability boundary, such tubes are linearly and nonlinearly unstable. The flux tube displacement can be of the order of the pressure gradient scale length. Plasma transport from displaced flux tubes may result in rapid loss of confinement.

  7. Guidelines and Suggestions for Balloon Gondola Design

    Science.gov (United States)

    Franco, Hugo

    2016-01-01

    The Columbia Scientific Balloon Facility is responsible for ensuring that science payloads meet the appropriate design requirements. The ultimate goal is to ensure that payloads stay within the allowable launch limits as well as survive the termination event. The purpose of this presentation is to provide some general guidelines for Gondola Design. These include rules and reasons on why CSBF has a certain preference and location for certain components within the gondola as well as other suggestions. Additionally, some recommendations are given on how to avoid common pitfalls.

  8. Aorta Balloon Occlusion in Trauma: Three Cases Demonstrating Multidisciplinary Approach Already on Patient’s Arrival to the Emergency Room

    International Nuclear Information System (INIS)

    PurposeTo describe the usage of aortic balloon occlusion (ABO), based on a multidisciplinary approach in severe trauma patients, emphasizing the role of the interventional radiologist in primary trauma care.MethodsWe briefly discuss the relevant literature, the technical aspects of ABO in trauma, and a multidisciplinary approach to the bleeding trauma patient. We describe three severely injured trauma patients for whom ABO was part of initial trauma management.ResultsThree severely injured multi-trauma patients were treated by ABO as a bridge to surgery and embolization. The procedures were performed by an interventional radiologist in the early stages of trauma management.ConclusionsThe interventional radiologist and the multidisciplinary team approach can be activated already on severe trauma patient arrival. ABO usage and other endovascular methods are becoming more widely spread, and can be used early in trauma management, without delay, thus justifying the early activation of this multidisciplinary approach

  9. Aorta Balloon Occlusion in Trauma: Three Cases Demonstrating Multidisciplinary Approach Already on Patient’s Arrival to the Emergency Room

    Energy Technology Data Exchange (ETDEWEB)

    Hörer, Tal M., E-mail: tal.horer@orebroll.se [Örebro University, Department of Cardiothoracic and Vascular Surgery, Örebro University Hospital (Sweden); Hebron, Dan [Hillel Yaffe Medical Center, Department of Radiology (Israel); Swaid, Forat [Bnai-Zion Medical Center, Department of General Surgery (Israel); Korin, Alexander [Hillel Yaffe Medical Center, Trauma Unit (Israel); Galili, Offer [Hillel Yaffe Medical Center, Department of Vascular Surgery (Israel); Alfici, Ricardo [Hillel Yaffe Medical Center, Surgical Division (Israel); Kessel, Boris [Hillel Yaffe Medical Center, Trauma Unit (Israel)

    2016-02-15

    PurposeTo describe the usage of aortic balloon occlusion (ABO), based on a multidisciplinary approach in severe trauma patients, emphasizing the role of the interventional radiologist in primary trauma care.MethodsWe briefly discuss the relevant literature, the technical aspects of ABO in trauma, and a multidisciplinary approach to the bleeding trauma patient. We describe three severely injured trauma patients for whom ABO was part of initial trauma management.ResultsThree severely injured multi-trauma patients were treated by ABO as a bridge to surgery and embolization. The procedures were performed by an interventional radiologist in the early stages of trauma management.ConclusionsThe interventional radiologist and the multidisciplinary team approach can be activated already on severe trauma patient arrival. ABO usage and other endovascular methods are becoming more widely spread, and can be used early in trauma management, without delay, thus justifying the early activation of this multidisciplinary approach.

  10. 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. PMID:25801773

  11. Flight Qualification of the NASA's Super Pressure Balloon

    Science.gov (United States)

    Cathey, Henry; Said, Magdi; Fairbrother, Debora

    Designs of new balloons to support space science require a number of actual flights under various flight conditions to qualify them to as standard balloon flight offerings to the science community. Development of the new Super Pressure Balloon for the National Aeronautics and Space Administration’s Balloon Program Office has entailed employing new design, analysis, and production techniques to advance the state of the art. Some of these advances have been evolutionary steps and some have been revolutionary steps requiring a maturing understanding of the materials, designs, and manufacturing approaches. The NASA Super Pressure Balloon development end goal is to produce a flight vehicle that is qualified to carry a ton of science instrumentation, at an altitude greater than 33 km while maintaining a near constant pressure altitude for extended periods of up to 100 days, and at any latitude on the globe. The NASA’s Balloon Program Office has pursued this development in a carefully executed incremental approach by gradually increasing payload carrying capability and increasing balloon volume to reach these end goal. A very successful test flight of a ~200,700 m3 balloon was launch in late 2008 from Antarctica. This balloon flew for over 54 days at a constant altitude and circled the Antarctic continent almost three times. A larger balloon was flown from Antarctica in early 2011. This ~422,400 m3 flew at a constant altitude for 22 days making one circuit around Antarctica. Although the performance was nominal, the flight was terminated via command to recover high valued assets from the payload. The balloon designed to reach the program goals is a ~532,200 m3 pumpkin shaped Super Pressure Balloon. A test flight of this balloon was launched from the Swedish Space Corporation’s Esrange Balloon Launch Facilities near Kiruna, Sweden on 14 August, 2012. This flight was another success for this development program. Valuable information was gained from this short test

  12. Recent developments in the scientific ballooning in India

    Science.gov (United States)

    Manchanda, R.; Sreenivasan, S.; Subbarao, J.; Kumar, P.

    RECENT DEVELOPMENTS IN THE SCIENTIFIC BALLOONING IN INDIA R. K. Manchanda1, S. Sreenivasan2, J. V. Subbarao2, P. R. Kumar2 1. Tata Institute of Fundamental Research Colaba, Mumbai-400 005, India. 2. TIFR Balloon Facility, PO Box 5, ECIL Post Office, Hyderabad-500 762, India ravi@tifr.res.in/FAX: +91-22-2152110 National Balloon facility operated by TIFR in Hyderabad, India is the only one of its kind in the world, which combines both, the in-house balloon production and a complete flight support for scientific ballooning. In the past few years we executed a major programme of upgradation of different components of balloon production, telemetry and telecommand hardware and various support facilities. This paper focuses on our increased capability of balloon production of large sizes up to 780,000 m3 using Antrix film, development of high strength balloon load tapes with the breaking strength of 182 kg, and the recent introduction of S-band telemetry and a commandable timer cut-off unit in the flight hardware. A summary of the various flights conducted in recent years and the results of the test flight conducted to qualify new sub systems will be presented.

  13. Methods for tracking of balloons and rockets at Esrange

    Science.gov (United States)

    Hedqvist, Tomas

    2001-08-01

    At Esrange several methods are used for tracking of balloons and rockets with help of radar, Vaisala sounding data, ARGOS and GPS information. Information from these different sources is fed into a computer system for processing, and for display on adapted systems. Data from balloon flights are displayed on a digital map, which includes population data and a system to predict impact point of the balloon. Data from rocket flights can be displayed either on a digital map, or in a system for range safety purpose. Signals from various sources are converted into a data format used in the new ATC (Air Traffic Control) transponder system in order to ease future integration into this system. Data from the GPS system in NMEA format can also be adopted directly into the tracking system for both balloon and rocket flight. Balloon tracking data is also transferred via Internet to ATCs centres for flight safety reasons. Future developments: A new system for wind measurements will be created from "throw away" GPS sondes. In air traffic transponders, the expensive altimeter will be replaced by an inexpensive GPS system. For recovery, Argos-GPS on balloons will be used for real-time tracking, position information via satellites and as a support system for recovery by helicopter. Balloons equipped with the Inmarsat system, for long duration balloon flights, will have their position displayed in the digital map system.

  14. The Evaluation of Endoscopic Balloon Dilation Treatment for

    Directory of Open Access Journals (Sweden)

    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.

  15. Reversible transient apical ballooning syndrome with coronary lesions

    Institute of Scientific and Technical Information of China (English)

    Yunshan Cao; Min Zhang; Xiang Li; Ping Xie; Lynn Cronin

    2009-01-01

    Transient apical ballooning syndrome(Tako-Tsubo syndrome or ampulla cardiomyopathy) occurs predominantly in women over 60 years of age with a history of recent physical or psychological stress. We present a case of a male patient with reversible transient apical ballooning syndrome with significant coronary lesions and other ECG changes that did not explain the clinical symptoms.

  16. Turner's syndrome associated with bicuspid aortic stenosis and dissecting aortic aneurysm

    OpenAIRE

    Slater, D N; Grundman, M. J.; Mitchell, L

    1982-01-01

    A case of Turner's syndrome is described associated with bicuspid aortic stenosis and fatal rupture of a thoracic dissecting aortic aneurysm. Histology of the aneurysm showed severe cystic medial necrosis. This association has not been previously described in the absence of coarctation.

  17. Combined surgical and catheter-based treatment of extensive thoracic aortic aneurysm and aortic valve stenosis

    DEFF Research Database (Denmark)

    De Backer, Ole; Lönn, Lars; Søndergaard, Lars

    2015-01-01

    An extensive thoracic aortic aneurysm (TAA) is a potentially life-threatening condition and remains a technical challenge to surgeons. Over the past decade, repair of aortic arch aneurysms has been accomplished using both hybrid (open and endovascular) and totally endovascular techniques. Thoraci...

  18. Heat pump technology

    CERN Document Server

    Von Cube, Hans Ludwig; Goodall, E G A

    2013-01-01

    Heat Pump Technology discusses the history, underlying concepts, usage, and advancements in the use of heat pumps. The book covers topics such as the applications and types of heat pumps; thermodynamic principles involved in heat pumps such as internal energy, enthalpy, and exergy; and natural heat sources and energy storage. Also discussed are topics such as the importance of the heat pump in the energy industry; heat pump designs and systems; the development of heat pumps over time; and examples of practical everyday uses of heat pumps. The text is recommended for those who would like to kno

  19. Spectrum of the ballooning Schroedinger equation

    International Nuclear Information System (INIS)

    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 θk 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 θk

  20. Intravascular ultrasound imaging following balloon angioplasty.

    Science.gov (United States)

    Tobis, J M; Mahon, D J; Moriuchi, M; Honye, J; McRae, M

    1991-01-01

    Despite its long history and reliability, contrast angiography has several inherent limitations. Because it is a two-dimensional projection image of the lumen contour, the wall thickness cannot be measured and the plaque itself is not visualized. This results in an underestimation of the amount of atherosclerotic disease by angiography. An assessment of atherosclerosis could be improved by an imaging modality: (1) that has an inherent larger magnification than angiography and (2) that directly visualizes the plaque. Intravascular ultrasound fulfils these criteria. This presentation will provide evidence that intravascular ultrasound may prove complimentary or even superior to angiography as an imaging modality. Intravascular ultrasound demonstrates excellent representations of lumen and plaque morphology of in vitro specimens compared with histology. There is very close intraobserver and interobserver variability of measurements made from intravascular ultrasound images. Phantom studies of stenoses in a tube model demonstrate that angiography can misrepresent the severity of stenosis when the lumen contour is irregular and not a typical ellipse, whereas intravascular ultrasound reproduces the cross-sectional morphology more accurately since it images the artery from within. In vitro studies of the atherosclerotic plaque tissue characteristics compare closely with the echo representation of fibrosis, calcification, and lipid material. In addition, in vitro studies of balloon angioplasty demonstrate that intravascular ultrasound accurately represents the changes in the structure of artery segments following balloon dilatation. PMID:1833473

  1. EUSO-Balloon: The first flight

    Science.gov (United States)

    Scotti, Valentina; Osteria, Giuseppe

    2016-07-01

    EUSO-Balloon is a pathfinder mission for JEM-EUSO, the near-UV telescope proposed to be installed on board the International Space Station (ISS). The main objective of this pathfinder mission is to perform a full scale end-to-end test of all the key technologies of JEM-EUSO detectors and to measure the UV background. The JEM-EUSO instrument consists of UV telescope designed to focus the signal of the UV tracks generated by Extreme Energy Cosmic Rays propagating in Earth's atmosphere, onto a finely pixelized UV camera. The EUSO-Balloon instrument, smaller than the one designed for the ISS, was launched on August 2014 from Timmins (Ontario, Canada). The flight lasted about five hours and the instrument reached a float altitude of about 40 km. From this altitude the telescope registered, at a rate of 400 000 frames/s, the nightglow background on forests, lakes and clouds, as well as city lights and artificial air showers tracks generated by means of a laser installed on an helicopter flying inside its field of view. In this contribution we will describe the instrument and its performance during the first flight.

  2. Balloon concepts for scientific investigation of Mars and Jupiter

    Science.gov (United States)

    Ash, R. L.

    1979-01-01

    Opportunities for scientific investigation of the atmospheric planets using buoyant balloons have been explored. Mars and Jupiter were considered in this study because design requirements at those planets bracket nominally the requirements at Venus, and plans are already underway for a joint Russian-French balloon system at Venus. Viking data has provided quantitative information for definition of specific balloon systems at Mars. Free flying balloons appear capable of providing valuable scientific support for more sophisticated Martian surface probes, but tethered and powered aerostats are not attractive. The Jovian environment is so extreme, hot atmosphere balloons may be the only scientific platforms capable of extended operations there. However, the estimated system mass and thermal energy required are very large.

  3. The ballooning of fuel cladding tubes: theory and experiment

    International Nuclear Information System (INIS)

    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)

  4. Primary Stenting of Focal Atherosclerotic Infrarenal Aortic Stenoses: Long-Term Results in 13 Patients and a Literature Review

    International Nuclear Information System (INIS)

    We conducted this study to investigate the value of primary stent implantation for the endovascular treatment of focal atherosclerotic stenoses of the infrarenal abdominal aorta. The data of 13 patients with a localized complex infrarenal aortic stenosis who underwent primary stenting was retrospectively evaluated. The patients (6 females, 7 males) had a mean age of 57.3 ± 9.1 years (mean ± SD). In all patients, the aortic diameter was measured on CT sections, and a self-expanding endoprosthesis was primarily implanted followed by dilatation with single or double balloons. In 3 patients, additional distal stenoses were also endovascularly treated. The procedure was technically successful in all patients. No complications occurred except for 2 minor groin hematomas. During the 43 ± 23 months (mean ± SD) follow-up (range: 12-96 months), all stented aortic segments remained patent. Clinical patency was lost in 4 patients, which was due to atherosclerosis or restenosis distal to the aorta. In view of the excellent early and long-term results, we believe that primary stenting should be considered the first line treatment in properly selected patients with focal atherosclerotic infrarenal stenoses of the abdominal aorta

  5. ALTERNATIVE METHOD OF SURGICAL CORRECTION OF DISSECTING AORTIC ANEURYSMS WITH AORTIC INSUFFIECIENCY

    Directory of Open Access Journals (Sweden)

    M. L. Semenovsky

    2009-01-01

    Full Text Available Patients with dissecting aortic aneurysm and associated acute aortic insufficiency form a group of seriously ill patients with significant cardiac failure, generally involving other organs and systems. It justifies an attempt to reduce a surgical risk, by using more sparing procedures, including supracoronary replacement of the ascending aorta with its root reconstruction. The latter has been performed in 27 patients (mean 54,5 ± 2,1 years with dissecting aortic aneurysm and aortic valvular insufficiency in 1996 to 2009. The major etiological factor was atherosclerosis (88%/ Seventeen (63%, 6 (22,2% and 4 (16% had types I, IIA and II dissection, respectively. Overall hospital mortality was 11%. In late period, progressive aneurysm dissection needed reinterventions in 2 cases. The competence of the reconstructed aortic valve was satisfactory both just after surgery and throughout the follow-up. Indications for this option of chronic correction, surgical techniques, and immediate and long-term results are outlined. 

  6. Abdominal Aortic Diameter Is Increased in Males with a Family History of Abdominal Aortic Aneurysms

    DEFF Research Database (Denmark)

    Mejnert Jørgensen, Trine; Houlind, K; Green, A;

    2014-01-01

    participants with male and female relatives with AAA. DESIGN: Observational population-based cross-sectional study. MATERIALS: 18,614 male participants screened for AAA in the VIVA-trial 2008-2011 with information on both family history of AAA and maximal aortic diameter. METHODS: Standardized ultrasound scan......OBJECTIVE: To investigate, at a population level, whether a family history of abdominal aortic aneurysm (AAA) is independently related to increased aortic diameter and prevalence of AAA in men, and to elucidate whether the mean aortic diameter and the prevalence of AAA are different between...... measurement of maximum antero-posterior aortic diameter. Family history obtained by questionnaire. Multivariate regression analysis was used to test for confounders: age, sex, smoking, comorbidity and medication. RESULTS: From the screened cohort, 569 participants had at least one first degree relative...

  7. Effect of parameter variations on the hemodynamic response under rotary blood pump assistance.

    Science.gov (United States)

    Lim, Einly; Dokos, Socrates; Salamonsen, Robert F; Rosenfeldt, Franklin L; Ayre, Peter J; Lovell, Nigel H

    2012-05-01

    Numerical models, able to simulate the response of the human cardiovascular system (CVS) in the presence of an implantable rotary blood pump (IRBP), have been widely used as a predictive tool to investigate the interaction between the CVS and the IRBP under various operating conditions. The present study investigates the effect of alterations in the model parameter values, that is, cardiac contractility, systemic vascular resistance, and total blood volume on the efficiency of rotary pump assistance, using an optimized dynamic heart-pump interaction model previously developed in our laboratory based on animal experimental measurements obtained from five canines. The effect of mean pump speed and the circulatory perturbations on left and right ventricular pressure volume loops, mean aortic pressure, mean cardiac output, pump assistance ratio, and pump flow pulsatility from both the greyhound experiments and model simulations are demonstrated. Furthermore, the applicability of some of the previously proposed control parameters, that is, pulsatility index (PI), gradient of PI with respect to pump speed, pump differential pressure, and aortic pressure are discussed based on our observations from experimental and simulation results. It was found that previously proposed control strategies were not able to perform well under highly varying circulatory conditions. Among these, control algorithms which rely on the left ventricular filling pressure appear to be the most robust as they emulate the Frank-Starling mechanism of the heart. PMID:22489771

  8. Complications of Aortic Stenting in Patients below 20 Years Old: Immediate and Intermediate Follow-Up

    Directory of Open Access Journals (Sweden)

    Akbar Molaei

    2011-12-01

    Full Text Available Background: Optimal timing and mode of treatment for patients with coarctation of the aorta (COA remain controversial, particularly in children. Surgery, balloon dilatation, and stent implantation have all proven effective in the treatment of moderate or severe obstruction. The aim of this study was to investigate the complications of COA stenting angioplasty in pediatric patients. Methods: This retrospective, descriptive study was conducted on patients less than 20 years of age who underwent aortic stenting angioplasty because of congenital COA in the pediatric catheterization laboratory of Rajaie cardiovascular, medical and research Center, Tehran between 2005 and 2010. Results: A total of 26 patients (18 [65.4%] males and 9 [34.6%] females with congenital COA who had undergone aortic stenting angioplasty were recruited. Nineteen (73.1% of these patients had native COA and 7 (26.9% had recurrent COA. Most of the early complications were minor and temporary; only one patient developed early major complications. During the follow-up, whereas none of the native group patients developed late complications, in the re-COA group 28.57% of the patients had re-stenosis and 14.28% had chronic systemic hypertension, requiring drug therapy. Conclusion: Our investigation into post-stenting complications in patients with native COA and re-COA showed that endovascular stenting could be an effective and safe method, even in young patients with native COA.

  9. Recently patented and widely used valves for transcatheter aortic valve implantation.

    Science.gov (United States)

    Neragi-Miandoab, Siyamek; Skripochnik, Edvard; Michler, Robert E

    2012-12-01

    Aortic stenosis (AS) is a serious condition in the aging US and European populations. Management of a stenotic valve is crucial as it can become symptomatic quickly leading to ventricular deterioration and overall poor quality of life. Considering that AS is a disease of the elderly patient population, surgical intervention may not be well tolerated by some patients. Transcatheter aortic valve implantation (TAVI) has emerged as an alternative approach for patients who are unsuitable surgical candidates. Since the first balloon-expandable Edwards SAPIEN valve (Edwards Lifesciences, Irvine, CA) was implanted by Dr. Cribier, many other valves have been introduced into clinical practice. Self-expanding valves such as the CoreValve ReValving system (Medtronic, Minneapolis, MN) for retrograde implantation and Symetis TX for antegrade and transapical implantation are the most frequently used self-expanding valves. The SAPIEN valve, on the other hand can be implanted both antegrade as well as retrograde. Overall, the most widely used valves are the Edwards SAPIEN and the CoreValve, which have been implanted in more than 40,000 patients worldwide. The Symetis valve has shown promising results in small series in Europe and may be introduced to the US market in the near future. This manuscript will review these 3 recently patented valves and discuss some of the clinical results that are available. PMID:23095028

  10. Percutaneous balloon mitral valvuloplasty by the Inoue balloon technique: the procedure of choice for treatment of mitral stenosis.

    Science.gov (United States)

    Cheng, T O; Holmes, D R

    1998-03-01

    The Inoue technique of percutaneous balloon mitral valvuloplasty, introduced in 1984, is a truly startling advance in cardiology in modern times. It is time to reeducate our colleagues that when they hear the opening snap in patients with mitral stenosis, they should automatically open these stenotic mitral valves with an Inoue balloon catheter rather than submit these patients to surgical correction. PMID:9514461

  11. Vasopressor mechanisms in acute aortic coarctation hypertension

    Directory of Open Access Journals (Sweden)

    Salgado H.C.

    1997-01-01

    Full Text Available Angiotensin II (ANG II and vasopressin (AVP act together with the mechanical effect of aortic constriction in the onset of acute aortic coarctation hypertension. Blockade of ANG II and AVP V1 receptors demonstrated that ANG II acts on the prompt (5 min rise in pressure whereas AVP is responsible for the maintenance (30-45 min of the arterial pressure elevation during aortic coarctation. Hormone assays carried out on blood collected from conscious rats submitted to aortic constriction supported a role for ANG II in the early stage and a combined role for both ANG II and AVP in the maintenance of proximal hypertension. As expected, a role for catecholamines was ruled out in this model of hypertension, presumably due to the inhibitory effect of the sinoaortic baroreceptors. The lack of afferent feedback from the kidneys for AVP release from the central nervous system in rats with previous renal denervation allowed ANG II to play the major role in the onset of the hypertensive response. Median eminence-lesioned rats exhibited a prompt increase in proximal pressure followed by a progressive decline to lower hypertensive levels, revealing a significant role for the integrity of the neuroaxis in the maintenance of the aortic coarctation hypertension through the release of AVP. In conclusion, the important issue raised by this model of hypertension is the likelihood of a link between some vascular territory - probably renal - below the coarctation triggering the release of AVP, with this vasoconstrictor hormone participating with Ang II and the mechanical effect of aortic constriction in the acute aortic coarctation hypertension

  12. Short-term and medium-term outcomes of transapical aortic valve implantation as a single-strategy approach: one center's experience

    Science.gov (United States)

    Mokráček, Aleš; Pešl, Ladislav; Kurfirst, Vojtěch; Šulda, Mirek

    2015-01-01

    Introduction Transcatheter aortic valve replacement has been developed as an alternative option for surgical high-risk or inoperable patients with severe symptomatic aortic stenosis. Aim of the study Aim of the study was to evaluate the outcomes of patients undergoing transapical aortic valve replacement as a single-strategy option by a single-center multidisciplinary heart team. Material and methods Between June 2009 and December 2014, 41 patients underwent transapical transcatheter aortic valve implantation (TA-TAVI) at our institution. All patients received Edwards SAPIEN balloon expandable pericardial valves (Edwards Lifesciences, Irvine, CA, USA). Our center followed a “clear transapical strategy” for all patients. Results The mean age of the patients was 79.6 years, and the mean logistic EuroSCORE was 21.06 ± 12.82%. Fifteen patients (36.6%) underwent redo operations. Complications included stroke (n = 1), re-exploration for bleeding or cardiac tamponade (n = 4), renal failure requiring temporary hemodialysis (n = 4) and permanent pacemaker implantation (n = 3). There were no myocardial infarctions or coronary obstruction. The total 30-day mortality rate was 17.1% (7 patients). Postoperative intensive care unit stay was 4.6 ± 5.7 days, and mean hospitalization was 11.6 ± 7.2 days. Conclusions The TA-TAVI approach provides good results in terms of early and midterm outcomes. This approach is feasible and safe for patients who have high surgical risk. PMID:26336490

  13. Microgravity combustion experiment using high altitude balloon.

    Science.gov (United States)

    Kan, Yuji

    In JAXA, microgravity experiment system using a high altitude balloon was developed , for good microgravity environment and short turn-around time. In this publication, I give an account of themicrogravity experiment system and a combustion experiment to utilize the system. The balloon operated vehicle (BOV) as a microgravity experiment system was developed from 2004 to 2009. Features of the BOV are (1) BOV has double capsule structure. Outside-capsule and inside-capsule are kept the non-contact state by 3-axis drag-free control. (2) The payload is spherical shape and itsdiameter is about 300 mm. (3) Keep 10-4 G level microgravity environment for about 30 seconds However, BOV’s payload was small, and could not mount large experiment module. In this study, inherits the results of past, we established a new experimental system called “iBOV” in order toaccommodate larger payload. Features of the iBOV are (1) Drag-free control use for only vertical direction. (2) The payload is a cylindrical shape and its size is about 300 mm in diameter and 700 mm in height. (3) Keep 10-3-10-4 G level microgravity environment for about 30 seconds We have "Observation experiment of flame propagation behavior of the droplets column" as experiment using iBOV. This experiment is a theme that was selected first for technical demonstration of iBOV. We are conducting the flame propagation mechanism elucidation study of fuel droplets array was placed at regular intervals. We conducted a microgravity experiments using TEXUS rocket ESA and drop tower. For this microgravity combustion experiment using high altitude balloon, we use the Engineering Model (EM) for TEXUS rocket experiment. The EM (This payload) consists of combustion vessel, droplets supporter, droplets generator, fuel syringe, igniter, digital camera, high-speed camera. And, This payload was improved from the EM as follows. (1) Add a control unit. (2) Add inside batteries for control unit and heater of combustion

  14. A Clinicopathological Study on Aortic Valves in Children

    Institute of Scientific and Technical Information of China (English)

    HUANG Ping; WANG Hongwei; ZHANG Zhenlu; HU Xiufen; LI Yanping; CHENG Peixuan; LIU Jianying

    2007-01-01

    In order to investigate the clinicopathological characteristics of aortic valve disease in children, all the native surgically excised aortic valves obtained between January 2003 and December 2005 were studied macroscopically and microscopically. The patients' medical records were reviewed and the clinical information was extracted. According to preoperative echocardiography, intraoperative assessment, and postoperative pathology, combined with clinical symptoms and signs, aortic valve diseases were divided into three categories: aortic stenosis (AS), aortic insufficiency (AI), and aortic stenosis with insufficiency (AS-AI). The etiology was determined according to the macroscopic, microscopic and clinical findings. The results showed that among 70 aortic valves, patient age ranged from 6 to 18 years, with a mean of 15.4 years, and there were 56 boys and 14 girts (male: female=4:1). Forty-four children only had pure aortic valve disease, and the other 26 children had aortic valve disease associated with other heart valve diseases. There were 5 cases of AS (7.14%), 60 cases of AI (85.71%) and 5 cases of AS-AI (7.14%). The causes were congenital aortic valve malformation (32 cases, 45.71%), rheumatic disease (28 cases, 40%), infective endocarditis (7 cases,10%), Marfan syndrome (2 cases, 2.86%), and undetermined (1 case, 1.43%). It was concluded that the common causes of aortic valve disease in order of frequency in children were congenital aortic valve malformation, rheumatic disease, infective endocarditis, and Marfan syndrome. AI was more common in children with aortic valve disease. Compared with adult patients, congenital bicuspid aortic valve in children was often AI. Histologically, the leaflets of congenital bicuspid aortic valve were mainly myxomatous, fibrosis and calcification less seen. AI was frequently found in rheumatic disease, mostly associated with other heart valve diseases. Macroscopic and microscopic examinations together with clinical

  15. The German Aortic Valve Registry (GARY): in-hospital outcome

    OpenAIRE

    Hamm, Christian W.; Möllmann, Helge; Holzhey, David; Beckmann, Andreas; Veit, Christof; Figulla, Hans-Reiner; Cremer, J; Kuck, Karl-Heinz; Lange, Rüdiger; Zahn, Ralf; Sack, Stefan; Schuler, Gerhard; Walther, Thomas; Beyersdorf, Friedhelm; Böhm, Michael

    2013-01-01

    Background Aortic stenosis is a frequent valvular disease especially in elderly patients. Catheter-based valve implantation has emerged as a valuable treatment approach for these patients being either at very high risk for conventional surgery or even deemed inoperable. The German Aortic Valve Registry (GARY) provides data on conventional and catheter-based aortic procedures on an all-comers basis. Methods and results A total of 13 860 consecutive patients undergoing repair for aortic valve d...

  16. Rapid prototyping in aortic surgery.

    Science.gov (United States)

    Bangeas, Petros; Voulalas, Grigorios; Ktenidis, Kiriakos

    2016-04-01

    3D printing provides the sequential addition of material layers and, thus, the opportunity to print parts and components made of different materials with variable mechanical and physical properties. It helps us create 3D anatomical models for the better planning of surgical procedures when needed, since it can reveal any complex anatomical feature. Images of abdominal aortic aneurysms received by computed tomographic angiography were converted into 3D images using a Google SketchUp free software and saved in stereolithography format. Using a 3D printer (Makerbot), a model made of polylactic acid material (thermoplastic filament) was printed. A 3D model of an abdominal aorta aneurysm was created in 138 min, while the model was a precise copy of the aorta visualized in the computed tomographic images. The total cost (including the initial cost of the printer) reached 1303.00 euros. 3D imaging and modelling using different materials can be very useful in cases when anatomical difficulties are recognized through the computed tomographic images and a tactile approach is demanded preoperatively. In this way, major complications during abdominal aorta aneurysm management can be predicted and prevented. Furthermore, the model can be used as a mould; the development of new, more biocompatible, less antigenic and individualized can become a challenge in the future. PMID:26803324

  17. Multiple pump housing

    Science.gov (United States)

    Donoho, II, Michael R.; Elliott; Christopher M.

    2010-03-23

    A fluid delivery system includes a first pump having a first drive assembly, a second pump having a second drive assembly, and a pump housing. At least a portion of each of the first and second pumps are located in the housing.

  18. Types of Breast Pumps

    Science.gov (United States)

    ... breast-shield. Some experts discourage the use of bicycle horn pumps because they may be difficult to clean and dry. Battery-Powered and Electric Pumps A powered breast pump uses batteries or a cord plugged into an electrical outlet to power a small motorized pump that ...

  19. 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.

  20. Boston's balloon dilatation for treatment of cardiac achalasia

    International Nuclear Information System (INIS)

    Objective: To review and summarize effectiveness and method of the Boston's balloon dilation in cardiac achalasia. Methods: The intensified guide wire was inserted into stomach through mouth cavity under TV control. The Boston's balloon was inserted to the cardiac stricture through the guide wire and dilatated with 15% contrast medium with to a maximum diameter for five minutes and then the balloon was dilatated again for 3-5 minutes, all together for 3-4 times. The severe stricture must be pre-dilatated with 20-25 mm diameter balloon. Results: The balloon insertion was technically successful in all 26 patients. The once success of balloon dilation was achieved in 24 patients and twice in other 2. Follow-up time was from 2 weeks to 31 months (mean 10.6 months). Recurrent stenosis had not occurred in all patients. Remission rate of dysphagia was 100%. Esophageal reflux occurred in 3 patients. Conclusions: The Boston's balloon dilatation is simple and effective for treatment of cardiac achalasia. The method sometimes may replace surgical procedure

  1. Procoagulant platelet balloons: evidence from cryopreparation and electron microscopy.

    Science.gov (United States)

    Hess, M W; Siljander, P

    2001-05-01

    Visualisation of the procoagulant transformation of human platelets has recently become possible through use of an in vitro approach combined with fluorescence and phase contrast microscopy. Here, we extended these studies to the ultrastructural level by employing both rapid freezing/freeze-substitution and conventional ambient-temperature chemical fixation for transmission and scanning electron microscopy. Procoagulant transformation was only inducible by adhering platelets to collagen fibrils or to the collagen-related peptide and exposing them to physiological extracellular Ca2+ levels. Under these conditions prominent, 2- to 4-micron-wide balloon-like structures were regularly observed, regardless of the specimen fixation protocol. In strong contrast to normal platelets in their vicinity, the balloons' subcellular architecture proved remarkably poor: dilute cytoplasm, no cytoskeleton, only a few, randomly distributed organelles and/or their remnants. Cryofixed balloons displayed intact and smooth surfaces whereas conventional specimen processing caused plasma membrane perforations and shrinkage of the balloons. Our results clearly show that neither the balloons themselves, nor their simple ultrastructure reflect fixation artefacts caused by inadequate membrane stabilisation. The balloons are interpreted as to be transformed and/or fragmented procoagulant platelets. Thus, the generation of balloons represents a genuine, final stage of platelet ontogenesis, presumably occurring alternatively to aggregate formation. PMID:11449892

  2. 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.

  3. Endoluminal stent-graft management for type B aortic dissection and descending thoracic aortic aneurysm

    International Nuclear Information System (INIS)

    Objective: To evaluate the feasibility and short-term early results of endoluminal stent-graft placement in the Stanford B type aortic dissection and the descending thoracic aortic aneurysms. Methods: From March 2003 to September 2005, a total of 31 patients underwent placement of endovascular stent-grafts ,including the descending thoracic aortic aneurysm (n=2) and Standford B type aortic dissection (n=29). All patients had hypertension, with urgent onset of progressive thoracic pain in 27. Two kinds of stent-graft were used in this series: the Talent (Medtronic) in 15 and Aegis (Microportmedicine, Shanghai) in 16 patients. Follow-up was carried out with clinical observations and CTA. Results: Stent-graft implantation for the proximal entry closure was successfully performed in all patients. The DSA of immediately post deployment of the stent-graft showed complete occlusion the proximal entry tear in 23/29 patients with dissection, and complete isolation of the aneurysm in two patients with aortic aneurysm. Endoleak was revealed in 6 patients with dissection. No major complications related to the procedure were encountered. Conclusions: The interventional placement of stent-graft for Type B aortic dissection and descending thoracic aortic aneurysm is safe with satisfactory short-term outcomes. Nonetheless, longer follow-up is highly desirable to assess its real advantages. (authors)

  4. Study of Coronary Artery Disease in Single Aortic Valvular Disease

    Institute of Scientific and Technical Information of China (English)

    张斌; 杨伟民; 占亚平

    2003-01-01

    Objectives To analyze the results of coronary angiographies (GAG) in patients with single aortic valvular heart disease; To study the relationship between aortic valve diseases and coronary artery disease (CAD). Methods 105 patients with single aortic valvular heart disease before surgery underwent angiography. The data of clinical characteristics and angiographies were analyzed. Results 51 patients had symptoms of angina pectoris among 105 patients with single aortic valvular heart disease. Seven of them were confirmed coronary artery disease by angiographies. Although the incidence of angina in aortic valve stenosis group was significantly higher than that in aortic valve regurgitation, the probability of combination of CAD in aortic valve stenosis group was similar to the later. However, the probability of combination of CAD in degenerative aortic valve group was significantly higher than the groups of rheumatic, congenitally bicuspid aortic valves, and other causes (p <0.01).Conclusions Angina pectoris is not sensitive for diagnosis of CAD in single aortic valve heart disease.The probability of combination of CAD in degenerative aortic valve disease is higher than that in aortic valve disease with other causes. Coronary angiography is strongly suggested for these patients.

  5. Ballooning of CANDU pressure tubes. Model assessment

    International Nuclear Information System (INIS)

    The transient creep equations used to analyze the possible ballooning and failure of Zr-2.5% Nb pressure tubes during a loss-of-coolant accident (LOCA) were developed and verified using as-received Zr-2.5% Nb pressure tube material. But in a CANDU reactor, the pressure tubes absorb deuterium and are exposed to a continuous neutron fluence. Consequently, a literature survey was done to determine how irradiation damage and deuterium might affect the creep rate and ductility of Zr-2.5% Nb pressure tubes in the temperature range from 600 to 800 degrees C. It was found that irradiation damage, dissolved deuterium and deuteride blisters could possibly affect the creep rate and ductility of ZR-2.5% Nb pressure tubes in this temperature range, but deuteride platelets are expected to have little effect. Further tests are required to determine the effect of irradiation damage and deuterium on the creep rate and ductility of pressure tubes

  6. Balloon brachytherapy: how I do it

    International Nuclear Information System (INIS)

    To describe the technical aspects of insertion of MammoSite Radiation System, cosmetic issues, patients selection for the procedure and their satisfaction. Seventy patients underwent brachytherapy after insertion of the MammoSite catheter and received a boost HDR totaling 1500 cGy in six fractions over a three day period. Each patient then received 5 weeks of external beam radiotherapy to the whole breast. Only T1-2 patients were treated. All patients had excellent cosmetic results. The complications (minimal skin erythema, hematoma, balloon leak, seroma, were minimal. The safety and effectiveness of the MammoSite Radiation Therapy System as a replacement for whole breast irradiation in the treatment of breast cancer has not yet been established. (author)

  7. Migration of Bakri balloon through an unsuspected uterine perforation during the treatment of secondary postpartum hemorrhage.

    Science.gov (United States)

    Leparco, Soizic; Viot, Alexandre; Benachi, Alexandra; Deffieux, Xavier

    2013-06-01

    The current case describes an unreported complication of Bakri balloon placement: the migration of the Bakri balloon to the broad ligament through an unsuspected uterine rupture. Finally, a hysterectomy had been required. The Bakri balloon may be involuntary introduced in an unexpected uterine rupture, even if the balloon is placed with ultrasound guidance. PMID:23470856

  8. 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.)

  9. Effect of poloidally asymmetric sheared flow on resistive ballooning turbulence

    International Nuclear Information System (INIS)

    The shear flow induced through the Reynolds stress tensor by turbulence with ballooning character is poloidally asymmetric. For circular cross section tokamak plasmas, its main component is the (m=1, n=0). The effect of such a sheared flow on both linear and nonlinear instability is analyzed. Its effect on the linear stability properties of resistive ballooning modes is compared with the effect of poloidally symmetric sheared flows. It is shown that asymmetry in the flow does not reduce its effectiveness in stabilizing the linear resistive ballooning modes. It is also effective in reducing the turbulence level and decreasing the turbulence induced diffusivities. copyright 1999 American Institute of Physics

  10. An investigation of electrostatically deposited radionuclides on latex balloons

    International Nuclear Information System (INIS)

    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)

  11. Validation of IASI ozone profiles, using balloon sounding data

    OpenAIRE

    Delcloo, Andy; Hurtmans, Daniel; Coheur, Pierre-François; Clerbaux, Cathy

    2011-01-01

    Here we present a validation study of IASI vertical ozone profiles. This has been done using balloon ozone sonde data, which have a vertical resolution of about 100 m and measures ozone from the surface up to an altitude of about 30 km. IASI vertical ozone profiles are given as partial ozone columns [in DU per layer] between varying pressure levels. To validate the satellite derived ozone layers with the balloon ozone sounding data we integrate the ozone measured by the balloon ozone sounding...

  12. Intragastric balloon for morbid obesity causing chronic gastric dilatation

    International Nuclear Information System (INIS)

    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.)

  13. Results of the first EUSO-Balloon flight

    Science.gov (United States)

    Miyamoto, H.; Bertaina, M.; JEM-EUSO Collaboration

    2016-05-01

    EUSO-Balloon, a balloon-borne diffractive fluorescence telescope, was launched by the French Space Agency ONES from the Timmins base in Ontario (Canada) on August 25th in 2014. After reaching the floating altitude of about 38 km, EUSO-Balloon imaged the UV background for more than 5 hours before descending to ground using the key technologies of JEM-EUSO. A detailed and precise measurement of the UV background in different atmospheric and ground conditions was achieved. The instrument proved the capability of detecting Extensive Air Showers (EAS) by observing laser tracks with similar characteristics. This contribution will summarise the first results obtained concerning all the topics described above.

  14. An investigation of electrostatically deposited radionuclides on latex balloons

    Energy Technology Data Exchange (ETDEWEB)

    Price, T.; Caly, A., E-mail: Terry.Price@gmail.com [Univ. of Ontario Inst. of Technology, Oshawa, Ontario (Canada)

    2012-07-01

    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. Robotic-assisted aortic valve bypass (apicoaortic conduit) for aortic stenosis.

    Science.gov (United States)

    Gammie, James S; Lehr, Eric J; Griffith, Bartley P; Dawood, Murtaza Y; Bonatti, Johannes

    2011-08-01

    Aortic valve bypass (AVB [apicoaortic conduit]) surgery consists of the construction of a valved conduit between the left ventricular apex and the descending thoracic aorta. In our institution, AVB is routinely performed without cardiopulmonary bypass or manipulation of the ascending aorta or native aortic valve. We report the case of an 83-year-old man with severe symptomatic bioprosthetic aortic stenosis, chronic thrombocytopenia, and a patent bypass graft who underwent robotically assisted beating-heart AVB through an anterior minithoracotomy. The distal anastomosis was constructed entirely using robotic telemanipulation. Robotic assistance enables the performance of beating-heart AVB through a small incision. PMID:21801931

  16. Digital substraction angiography in aortic dissection

    International Nuclear Information System (INIS)

    Regardless of the technical progress in new noninvasive methods, aortography is still regarded as a method providing the necessary information for cases of aortic dissection, especially those requiring emergency operative management. Twenty-four DS-aortographies of patients suspected for aortic dissection are reviewed. Intraarterial DSA is less hazardous owing to the reduced flow rate and quantity of contrast medium required. The relative share of inadequate images is rather high, and conventional cineaortography cannot be invariably replaced by the digital subtracted one. However, angiographic examination in cases suspected for aortic dissection may start with intraarterial digital substraction, and provided the latter proves inconclusive, conventional cineaortography may be resorted to. 6 refs., 3 figs. (orig.)

  17. Acute Aortic Dissection Extending Into the Lung.

    Science.gov (United States)

    Makdisi, George; Said, Sameh M; Schaff, Hartzell V

    2015-07-01

    The radiologic manifestations of ruptured acute aortic dissection, Stanford type A aortic dissection, DeBakey type 1 can present in different radiographic scenarios with devastating outcomes. Here, we present a rare case of a 70-year-old man who presented to the emergency department with chest pain radiating to the back. A chest computed tomography scan showed a Stanford type A, DeBakey type 1, acute aortic dissection ruptured into the aortopulmonary window and stenosing the pulmonary trunk, both main pulmonary arteries, and dissecting the bronchovascular sheaths and flow into the pulmonary interstitium, causing pulmonary interstitial hemorrhage. The patient underwent emergent ascending aorta replacement with hemiarch replacement with circulatory arrest. The postoperative course was unremarkable. PMID:26140779

  18. Transcatheter CoreValve valve-in-valve implantation in a stentless porcine aortic valve for severe aortic regurgitation

    OpenAIRE

    Yong, Celina M; Buchbinder, Maurice; Giacomini, John C

    2014-01-01

    Key Clinical Message We describe the first valve-in-valve Corevalve transcatheter aortic valve replacement in the St. Jude Toronto stentless porcine aortic valve in the United States, which enabled this 59-year-old patient with a history of bacterial endocarditis and aortic regurgitation to avoid heart transplant with complete resolution of his severe left ventricular dysfunction.

  19. Diagnostic imaging of acute aortic dissection

    International Nuclear Information System (INIS)

    One hundred and nineteen patients with aortic dissection who underwent diagnostic imaging were reviewed and angiographic findings as well as those of CT were analysed. Thirty eight cases (43.1%) had non-contrast opacified false lumen, the type of which we call 'thrombosed type aortic dissection'. A comparative study of the thrombosed type with the patent type of false lumens was made particularly from the stand point of the characteristic diagnostic imagings (CT and angiography). At the same time, the pitfalls of these imagings in thrombosed type aortic dissection were studied. At the onset the average age of thrombosed type was 62.3 years old, while that of the patent type was 57.3. A statistical significance between the two groups was p<0.05. Thrombosed type in all cases was caused by atherosclerosis, whereas patent type was caused by the Marfan's syndrome in 11 cases. Other clinical findings, such as initial symptoms and blood pressure revealed no significant differences between the two groups. Pre-contrast CT in acute thrombosed type aortic dissection showed 'hyperdense crescent sign' in 89.4%. However, in 3 cases with thrombosed type in which the pre-contrast CT showed 'hyperdense crescent sign' contrast-enhanced CT detected no clear evidence of aortic dissection in the same site. This was due to obscurity induced by contrast medium. Angiographic findings of thrombosed type were classified into 3 groups: normal type, stenosed true lumen type and ulcer-like projection type. The incidence of normal type was estimated to be 48.4%, whereas stenosed true lumen type was 24.2% and ulcer-like projection was 27.7%. The present study concluded that thrombosed type is not rare in acute aortic dissection and contrast-enhanced CT as well as pre-contrast CT, is of great value in diagnosing thrombosed type. 'Hyperdense crescent sign' in pre-contrast CT is characteristic of intramural hematoma. (author)

  20. Anesthesia Approach in Endovascular Aortic Reconstruction

    Directory of Open Access Journals (Sweden)

    Ayşin Alagöl

    2013-03-01

    Full Text Available Introduction: We have analyzed our initial results of our anesthesia techniques in our new-onset endovascular aortic reconstruction cases.Patients and Methods: The perioperative data of 15 elective and emergent endovascular aortic reconstruction cases that were operated in 2010-2011 were collected in a database. The choice of anesthesia was made by the risk factors, surgical team’s preferences, type and location of the aortic pathology and by the predicted operation duration. The data of local and general anesthesia cases were compared.Results: Thirteen (86.7% cases were male and 2 (13.3% female. Eleven patients were in ASA Class III. The demographic parameters, ASA classifications, concurrent diseases were similar in both groups. Thirteen (86.7% cases had infrarenal abdominal aortic aneurysm and 2 (13.3% had Type III aortic dissection. The diastolic arterial pressures were lower in general anesthesia group in 20th and 40th minutes’ measurements just like the mean arterial pressure measurements at the 40th, 100th minutes and during the deployment of the graft. Postoperative mortality occurred in 3 (20.0% patients and they all had general anesthesia and they were operated on emergency basis. Postoperative morbidity occurred in four patients that had general anesthesia (acute renal failure, multi-organ failure and pneumonia. The other patient had atrial fibrillation on the 1st postoperative day and was converted to sinus rhythm with amiodarone infusion.Conclusion: Edovascular aortic reconstruction procedures can safely be performed with both general and local anesthesia less invasively compared to open surgery. General anesthesia may be preferred for the better hemodynamic control.

  1. Pump element for a tube pump

    DEFF Research Database (Denmark)

    2011-01-01

    The invention relates to a tube pump comprising a tube and a pump element inserted in the tube, where the pump element comprises a rod element and a first and a second non-return valve member positioned a distance apart on the rod element. The valve members are oriented in the same direction...... portion acts to alternately close and open the valve members thereby generating a fluid flow through the tube. The invention further relates to a pump element comprising at least two non-return valve members connected by a rod element, and for insertion in an at least partly flexible tube in such tube...... pump as mentioned above, thereby acting to generate a fluid flow through the tube upon repeated deformation of the tube between the two valve members. The pump element may comprise a connecting part for coupling to another tube and may comprise a sealing part establishing a fluid tight connection to a...

  2. Derivatives of the local ballooning growth rate with respect to surface label, field line label and ballooning parameter

    International Nuclear Information System (INIS)

    For comprehensive ballooning analysis in three-dimensional (stellarator) systems, an extensive set of ballooning eigenvalue calculations is generally required. For several applications, it is convenient to know how the local ballooning stability will change as a function of the surface label ψ, the field line label α and the angle-like ballooning parameter ηk. A particularly important application is in the ray tracing problem [Dewar and Glasser 1983], when results from the local ballooning analysis are extended to make predictions regarding global stability. This article presents an explicit method for calculating the derivatives of the ballooning eigenvalue with respect to (ψ, α,ηk). The required derivatives satisfy δλ = ∂λ/∂ψ|α,ηk δψ + ∂λ/∂α|ψ,ηk δα+ ∂λ/ ∂ηk| ψ,α δηk, (1) for infinitesimal variations δψ,δα and δηk. The method is an application of eigenvalue perturbation analysis. The ballooning equation, with eigenvalue λ and eigenfunction ξ, may be written ∂ηP∂ηξ + Qξ = λRξ, (2). A small change in (ψ, α, ηk) induces a change in the ballooning coefficients, and a corresponding variation in the ballooning eigenvalue. The eigenvalue derivatives are calculated ∂λ/∂ψ|α,ζ = ηδPψ∂ + δQψ - λδRψ|ξ> (3) where Pψ, Qψ, and Rψ are the changes in the coefficients due to a small change in ψ,with similar expressions for ∂λ/∂α and ∂λ/∂ηk. Preliminary results of ray-tracing calculations will be presented. (author)

  3. Chylous complications after abdominal aortic surgery.

    Science.gov (United States)

    Haug, E S; Saether, O D; Odegaard, A; Johnsen, G; Myhre, H O

    1998-12-01

    Two patients developed chylous complications following abdominal aortic aneurysm repair. One patient had chylous ascitis and was successfully treated by a peritoneo-caval shunt. The other patient developed a lymph cyst, which gradually resorbed after puncture. Chylous complications following aortic surgery are rare. Patients in bad a general condition should be treated by initial paracentesis and total parenteral nutrition, supplemented by medium-chain triglyceride and low-fat diet. If no improvement is observed on this regimen, the next step should be implementation of a peritoneo-venous shunt, whereas direct ligation of the leak should be reserved for those who are not responding to this treatment. PMID:10204656

  4. Supravalvular aortic stenosis with sudden cardiac death

    Directory of Open Access Journals (Sweden)

    Pradeep Vaideeswar

    2015-01-01

    Full Text Available Sudden cardiac death (SCD most commonly results from previously undiagnosed congenital, acquired, or hereditary cardiac diseases. Congenital aortic valvular, subvalvular, and supravalvular disease with left ventricular outflow tract obstruction is an important preventable cause of sudden death. This report documents sudden death presumably due to acute myocardial ischemia in a young male with an undiagnosed supravalvular aortic stenosis (SVAS due to a rare association of isolation of coronary sinuses of Valsalva. Congenital supravalvular pulmonary stenosis and mitral valvular dysplasia were also present.

  5. Contemporary management of blunt aortic trauma.

    Science.gov (United States)

    Dubose, J J; Azizzadeh, A; Estrera, A L; Safi, H J

    2015-10-01

    Blunt thoracic aortic injury (BTAI) remains a common cause of death following blunt mechanisms of trauma. Among patients who survive to reach hospital care, significant advances in diagnosis and treatment afford previously unattainable survival. The Society for Vascular Surgery (SVS) guidelines provide current best-evidence suggestions for treatment of BTAI. However, several key areas of controversy regarding optimal BTAI care remain. These include the refinement of selection criteria, timing for treatment and the need for long-term follow-up data. In addition, the advent of the Aortic Trauma Foundation (ATF) represents an important development in collaborative research in this field. PMID:25868973

  6. Infective endocarditis following transcatheter aortic valve replacement-

    DEFF Research Database (Denmark)

    Loh, Poay Huan; Bundgaard, Henning; S�ndergaard, Lars

    2013-01-01

    Transcatheter aortic valve replacement (TAVR) can improve the symptoms and prognosis of patients with severe aortic stenosis who, due to a high expected operative risk, would not have otherwise been treated surgically. If these patients develop prosthetic valve endocarditis, their presentations may...... be atypical causing a delay in the diagnosis and treatment. The management is also complicated by their comorbidities, and surgical treatment may not be feasible leading to a significant morbidity and mortality. We describe a case of an 85-year-old man with TAVI prosthetic valve endocarditis...

  7. Abdominal aortic aneurysm demonstrated on renal scintigraphy.

    Science.gov (United States)

    Phisitkul, Sorot; Brian, Susan; Rakvit, Ariwan; Jenkins, Leigh A; Bohannon, W Todd; Harris, Jennifer; Tsikouris, James; Silva, Michael B; Meyerrose, Gary E

    2003-08-01

    A 74-year-old hypertensive woman presented with abdominal discomfort and a pulsatile abdominal mass. Anterior abdominal angiography during cardiac blood pool, and renal scintigraphic imaging demonstrated a large abdominal aortic aneurysm. 1, 2 Before endovascular repair with an aortoiliac endograft, the abdominal aneurysm measured 7.5 x 7.0 cm on abdominal computed tomography. This study demonstrates that a suspected abdominal aortic aneurysm can be confirmed using the addition of anterior abdominal imaging with normal posterior imaging at the time of renal scintigraphy. PMID:12897671

  8. Beveled reversed elephant trunk procedure for complex aortic aneurysm.

    Science.gov (United States)

    Fujikawa, Takuya; Yamamoto, Shin; Sekine, Yuji; Oshima, Susumu; Kasai, Reo; Sasaguri, Shiro

    2016-03-01

    The reversed elephant trunk procedure uses an inverted graft for distal aortic replacement before aortic arch replacement in patients with mega aorta, to reduce the risk in the second stage. However, the conventional technique restricts the maximum diameter of the inverted graft to the aortic graft diameter. We employed a beveled reversed elephant trunk procedure to overcome the discrepancy between graft diameters in a 54-year-old woman with a severely twisted ascending aortic graft and enlarging chronic dissection of the aortic arch and descending thoracic aorta. The patient was discharged with a satisfactory repair and no neurologic deficit. PMID:25406402

  9. Gastrostomy feeding tube - pump - child

    Science.gov (United States)

    Feeding - gastrostomy tube - pump; G-tube - pump; Gastrostomy button - pump; Bard Button - pump; MIC-KEY - pump ... Gather supplies: Feeding pump (electronic or battery powered) Feeding set that matches the feeding pump (includes a feeding bag, drip chamber, roller clamp, ...

  10. Low Cost Variable Conductance Heat Pipe for Balloon Payload Project

    Data.gov (United States)

    National Aeronautics and Space Administration — While continuously increasing in complexity, the payloads of terrestrial high altitude balloons need a thermal management system to reject their waste heat and to...

  11. Current status of intragastric balloon for obesity treatment

    Science.gov (United States)

    Kim, Seung Han; Chun, Hoon Jai; Choi, Hyuk Soon; Kim, Eun Sun; Keum, Bora; Jeen, Yoon Tae

    2016-01-01

    Endoscopic bariatric therapy may be a useful alternative to pharmacological treatment for obesity, and it provides greater efficacy with lower risks than do conventional surgical procedures. Among the various endoscopic treatments for obesity, the intragastric balloon is associated with significant efficacy in body weight reduction and relief of comorbid disease symptoms. Anatomically, this treatment is based on gastric space-occupying effects that increase the feeling of satiety and may also affect gut neuroendocrine signaling. The simplicity of the intragastric balloon procedure may account for its widespread role in obesity treatment and its applicability to various degrees of obesity. However, advances in device properties and procedural techniques are still needed in order to improve its safety and cost-effectiveness. Furthermore, verification of the physiological outcomes of intragastric balloon treatment and the clinical predictive factors for treatment responses should be considered. In this article, we discuss the types, efficacy, safety, and future directions of intragastric balloon treatment. PMID:27350727

  12. Proposed techniques for launching instrumented balloons into tornadoes

    Science.gov (United States)

    Grant, F. C.

    1971-01-01

    A method is proposed to introduce instrumented balloons into tornadoes by means of the radial pressure gradient, which supplies a buoyancy force driving to the center. Presented are analytical expressions, verified by computer calculations, which show the possibility of introducing instrumented balloons into tornadoes at or below the cloud base. The times required to reach the center are small enough that a large fraction of tornadoes are suitable for the technique. An experimental procedure is outlined in which a research airplane puts an instrumented, self-inflating balloon on the track ahead of the tornado. The uninflated balloon waits until the tornado closes to, typically, 750 meters; then it quickly inflates and spirals up and into the core, taking roughly 3 minutes. Since the drive to the center is automatically produced by the radial pressure gradient, a proper launch radius is the only guidance requirement.

  13. 10 meter Sub-Orbital Large Balloon Reflector (LBR) Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Besides serving as a launch vehicle, the carrier balloon provides a stable mount for the enclosed telescope. Looking up, the LBR will serve as a telescope. Looking...

  14. Cardiovascular magnetic resonance of quinticuspid aortic valve with aortic regurgitation and dilated ascending aorta

    OpenAIRE

    Zhang Zhaoqi; Zhang Lijun; Meng Yanfeng; Wang Yongmei; Yang Xiaoming

    2009-01-01

    Abstract We report a rare case of a quinticuspid aortic valve associated with regurgitation and dilation of the ascending aorta, which was diagnosed and post-surgically followed up by cardiovascular magnetic resonance and dual source computed tomography.

  15. First transcatheter aortic valve implantation for severe pure aortic regurgitation in Asia.

    Science.gov (United States)

    Chiam, Paul Toon-Lim; Ewe, See Hooi; Chua, Yeow Leng; Lim, Yean Teng

    2014-02-01

    Transcatheter aortic valve implantation (TAVI) has become the standard of care for inoperable patients with symptomatic severe aortic stenosis (AS), and an alternative to open aortic valve replacement for patients at high surgical risk. TAVI has also been performed in several groups of patients with off-label indications such as severe bicuspid AS, and as a valve-in-valve therapy for a degenerated surgical bioprosthesis. Although TAVI with CoreValve® prosthesis is technically challenging, and global experience in the procedure is limited, the procedure could be a treatment option for well-selected patients with severe pure aortic regurgitation (AR). Herein, we report Asia's first case of TAVI for severe pure AR in a patient who was at extreme surgical risk, with good clinical outcome at six months. PMID:24570320

  16. Computed tomography angiography of hybrid thoracic endovascular aortic repair of the aortic arch.

    Science.gov (United States)

    Akhtar, Nila J; Oderich, Gustavo S; Vrtiska, Terri J; Williamson, Eric E; Araoz, Philip A

    2013-05-01

    Endovascular repair of the aorta has traditionally been limited to the abdominal aorta and, more recently, the descending thoracic aorta. However, recently hybrid repairs (a combination of open surgical and endovascular repair) have made endovascular repair of the aortic arch possible. Hybrid repair of the aortic arch typically involves an open surgical debranching procedure that allows for revascularization of the aortic arch vessels and subsequent endovascular stent placement. These approaches avoid the deep hypothermic circulatory arrest required for full, open surgical repair of the aortic arch. In hybrid repairs, the stent landing zone determines which branch vessels will be covered and therefore need revascularization. This article will review the preprocedure assessment with computed tomography angiography, techniques for revascularization and postprocedure complications. PMID:23621141

  17. Factors influencing long-term survival after aortic valve replacement.

    Directory of Open Access Journals (Sweden)

    Shigenobu,Masaharu

    1980-06-01

    Full Text Available In the aortic stenosis group, the left ventricular (LV muscle mass index was a good parameter for predicting the prognosis. Associated mitral valve disease had no influence on long term survival after aortic valve replacement. In the aortic insufficiency group, associated mitral valve disease had a marked influence on the results of aortic valve replacement. In general, the aortic insufficiency group had less clinical improvement postoperatively than the aortic stenosis group. In the annuloaortic ectasia group, left ventricular enddiastolic pressure (LVEDP might be the predictor to the prognosis. This group had the worst prognosis, of the three groups. Early operation should be considered for patients who have no, or only mild symptoms of, aortic valve disease.

  18. Tritium gas transfer pump development

    International Nuclear Information System (INIS)

    Non-lubricated, hermetically sealed pumps for tritium service have been selected to replace Sprengel pumps in the existing Tritium Facility. These pumps will be the primary gas-transfer pumps in the planned Replacement Tritium Facility. The selected pumps are Metal Bellows Corporation's bellows pumps and Normetex scroll pumps. Pumping range for a Normetex/Metal Bellows system is from 0.01 torr suction to 2300 torr discharge. Performance characteristics of both pumps are presented. 10 figs

  19. Large electromagnetic pumps. [LMFBR

    Energy Technology Data Exchange (ETDEWEB)

    Kilman, G.B.

    1976-01-01

    The development of large electromagnetic pumps for the liquid metal heat transfer systems of fission reactors has progressed for a number of years. Such pumps are now planned for fusion reactors and solar plants as well. The Einstein-Szilard (annular) pump has been selected as the preferred configuration. Some of the reasons that electromagnetic pumps may be preferred over mechanical pumps and why the annular configuration was selected are discussed. A detailed electromagnetic analysis of the annular pump, based on slug flow, is presented. The analysis is then used to explore the implications of large size and power on considerations of electromagnetic skin effect, geometric skin effect and the cylindrical geometry.

  20. Small Research Balloons in a Physics Course for Education Majors

    Science.gov (United States)

    Bruhweiler, F. C.; Verner, E.; Long, T.; Montanaro, E.

    2013-12-01

    At The Catholic Univ. of America, we teach an experimental physics course entitled Physics 240: The Sun-Earth Connection, which is designed for the undergraduate education major. The emphasis is on providing hands-on experience and giving the students an exciting experience in physics. As part of this course, in the Spring 2013 semester, we instituted a project to plan, build, launch, and retrieve a small (~1.3 kg) research balloon payload. The payload flown was a small GPS unit that sent its position to an Internet site, a small wide-angle high-resolution video camera, and an analog refrigerator thermometer placed in the field of view of the camera. All data were stored on the camera sim-card. Students faced the problems of flying a small research balloon in the congested, densely populated Northeast Corridor of the US. They used computer simulators available on the Web to predict the balloon path and flight duration given velocities for the Jet Stream and ground winds, as well as payload mass and amount of helium in the balloon. The first flight was extremely successful. The balloon was launched 140 km NW of Washington DC near Hagerstown, MD and touched down 10 miles (16 km) NW of York, PA, within 1.6 km of what was predicted. The balloon reached 73,000 ft (22,000 m) and the thermometer indicated temperatures as low as -70 degrees Fahrenheit (-57 C) during the flight. Further balloon flights are planned in conjunction with this course. Additional exercises and experiments will be developed centered around these flights. Besides learning that science can be exciting, students also learn that science is not always easily predictable, and that these balloon flights give an understanding of many of problems that go into real scientific space missions. This project is supported in part by an educational supplement to NASA grant NNX10AC56G

  1. Percutaneous Transhepatic Balloon Dilatation of Benign Biliary Strictures

    OpenAIRE

    Trambert, Jonathan J.; Bron, Klaus M.; Zajko, Albert B.; Starzl, Thomas E.; Iwatsuki, Shunzaburo

    1987-01-01

    Between February 1981 and June 1984, 15 patients with benign biliary strictures were treated with percutaneous transhepatic balloon dilatation. Three of these patients had received liver transplants. The treatment began with a course of balloon dilatation therapy, after which a stent catheter was left across the stricture. Six weeks later, after duct patency had been shown by cholangiography, the stent catheter was removed from all but two patients, both of whom had intrahepatic sclerosing ch...

  2. How to Inflate the Balloon Can Be Dangerous?

    OpenAIRE

    Yürümez, Yusuf; Küçük, Egemen; YAVUZ, Yücel; Eşme, Hıdır; SOLAK, Okan; Yücel, Murat

    2013-01-01

    Spontaneous pneumomediastinum is a quite rare clinical condition. A variety of reasons are responsible from etiology thats are increases intra-alveolar pressure and leading to rupture of alveoli. In this study 38-year-old male patient has been submitted that he has crackling sensation and pain in the neck region, hoarseness and shortness of breath two hours after inflating the balloon. Inflating the balloon that not included in the literature and appear to be innocent should be included among...

  3. Balloon observations of solar ultraviolet irradiance at solar minimum

    International Nuclear Information System (INIS)

    Balloon observations of solar irradiance between 200 and 240 nm have been performed in 1976 and 1977 corresponding to minimum conditions of solar activity. Ultraviolet spectra have been recorded for different zenith angles at an altitude of 41 km by means of a spectrometer with a spectral bandpass of 0.4 nm. Solar irradiances at 1 a.u. confirm previous values obtained by balloon. They are compared with other measurements and discussed in terms of possible long-term variability. (author)

  4. Anatomics Knowledges of Aortic Root in the Transcatheter Aortic Valve Implantation.

    Directory of Open Access Journals (Sweden)

    Marcelo Cerezo

    2010-12-01

    Full Text Available The Aortic Valve is a valvular system that bears different high pressure forces. It takes part of a complex structure called Aortic Root. Nowadays, anatomic knowledge has taken a preponderant role, due to the use of the Transcatether Aortic Valve Implant (TAVI. To describe the patient´s characteristics which exclude them of the TAVI for anatomic reasons in cadaveric dissections and transthoracic echocardiograms. A descriptive retrospective analysis of 67 individuals was performed and divided into two groups. Group A: Formalized cadaveric dissections with hypertrofic hearts and aortic sclerosis signs from the Chair A of Anatomy of the University of La Plata (UNLP. Group B: Transthoracic Echocardiograms realized at the San Martín Hospital of La Plata between January 2005 and December 2009. Out of 67 individuals assessed, 17 (25% had one or more contraindications for TAVI. Five on Group A (36%, and 12 on Group B (23%. The most common anatomic contraindication was the Ascending Aortic diameter less than 30mm and the aortic annulus less than 20mm, following to the RAo-TSVI Angle more than 145° (2 to Group A, and 4 to Group B and the Septal thickness more than 17mm (no one to Group A, and 3 to Group B. Only just one individual was found with a low implant left coronary artery in the Group A avoiding TAVI. According to this study, the anatomic contraindications to realize TAVI are frequent due to the diagnosis devices available at the moment. The anatomic aortic root knowledge and the aortic valve interindividual variability will allow the improvement of the manufactured devices made in the market.

  5. Marfan syndrome in children and adolescents: predictive and prognostic value of aortic root growth for screening for aortic complications

    OpenAIRE

    Groenink, M; Rozendaal, L; Naeff, M.S.J.; Hennekam, R.C.M.; Hart, A.A.M.; Wall; Mulder, B.J.M.

    1998-01-01

    Objective—To assess and measure the diagnostic and prognostic value of individual aortic root growth in children and adolescents with Marfan syndrome.
Design—From 1983 to 1996, 250 children were screened for Marfan syndrome. Serial echocardiographic aortic root measurements of 123 children (57 Marfan, 66 control) were available for evaluation of aortic root growth. Aortic root diameters were correlated with body surface area. Based on individual growth of the aortic root a discrimination form...

  6. The ascending aortic image quality and the whole aortic radiation dose of high-pitch dual-source CT angiography

    OpenAIRE

    Liu, Ying; Xu, Jian; Jian LI; Ren, Jing; LIU, HONGTAO; Xu, Junqing; Wei, Mengqi; Hao, Yuewen; Zheng, Minwen

    2013-01-01

    Background Aortic dissection is a lift-threatening medical emergency associated with high rates of morbidity and mortality. The incidence rate of aortic dissection is estimated at 5 to 30 per 1 million people per year. The prompt and correct diagnosis of aortic dissection is critical. This study was to compare the ascending aortic image quality and the whole aortic radiation dose of high-pitch dual-source CT angiography and conventional dual-source CT angiography. Methods A total of 110 conse...

  7. Development of a tiny tandem balloon system for atmospheric observation

    Science.gov (United States)

    Saito, Yoshitaka; Yamada, Kazuhiko; Fujiwara, Masatomo

    2016-07-01

    A tandem balloon system with a combination of a zero-pressure balloon on top and a super-pressure balloon on the bottom has a unique trajectory characteristic, with different flight altitudes between day and night and thus with ascending and descending motions at dawn and dusk, respectively. This characteristic provides a unique opportunity to explore the atmosphere, e.g., the upper tropospheric and lower stratospheric region with cross-tropopause measurements twice a day. We started development of a tiny tandem balloon system using a 10 m^{3} super-pressure balloon and a 100 m^{3} zero-pressure balloon, with a capability of carrying 3 kg of payload. One of the scientific targets is to measure water vapor, cloud particles, and temperature around the tropical tropopause which is the entry point of the stratospheric and mesospheric meridional circulation. For the data transfer, the iridium satellite communication module, SBD9603 is used. In this paper, the current status of the development will be reported.

  8. Changes in valvular resistance, power dissipation and myocardial reserve with aortic valvuloplasty.

    Science.gov (United States)

    Feldman, T; Ford, L E; Chiu, Y C; Carroll, J D

    1992-09-01

    Balloon aortic valvuloplasty results in small changes in valve area with great symptomatic improvement in some patients, while others have little relief with greater increases in valve area. Alternative indices to valve area may help explain this clinical discrepancy. A calculation of valve area does not provide a means of assessing the load imposed by a stenotic valve, while the complementary index valve resistance, defined as the quotient of mean pressure difference divided by flow, allows many other hemodynamic calculations and may provide an additional measure of the hemodynamic importance of valvular obstructions. To assess the value of these calculations, we studied hemodynamic changes in thirty elderly patients undergoing valvuloplasty for aortic stenosis. The valve area, as calculated by the Gorlin formula, increased by an average 67% (0.59 cm2 to 0.95 cm2), while hemodynamic resistance decreased by an average 52% (453 to 207 dyne.sec.cm5). The values of resistance were used to predict pressure gradients and work loads at different cardiac outputs. The increase in myocardial reserve with valvuloplasty was calculated as the increase in cardiac output that could be achieved at the pre-valvuloplasty value of either total ventricular pressure or ventricular work. These calculations assumed that valvular resistance did not change with cardiac output and that peripheral resistance varied inversely to cardiac output so as to maintain a constant aortic (systemic) pressure. The increase in myocardial reserve was 18% when ventricular work rate was the limiting factor, and 103% when pressure was limiting. The increase in reserve may be closer to the higher value since the myocardial work rate is probably not limited by myocardial energy in the absence of coronary artery disease. Four patients who did not do well clinically were characterized by small increases in reserve, either because of inadequate dilatation of the valve or because the original stenosis was not

  9. Aorto-right atrial fistula after ascending aortic replacement or aortic value replacement

    International Nuclear Information System (INIS)

    Objective: To evaluate the CT features of aorto-right atrial fistula after aortic valve replacement (AVR) or ascending aortic replacement. Methods: Eighty-seven patients with aortic-right atrial fistula underwent CT after operation. The CT features were retrospectively analyzed. Fistula was measured according to maximum width of the shunt. Results: Aorto-right atrial fistula was detected in 87 patients after aortic valve replacement or ascending aortic replacement by CT scan. Among them, 25 patients were diagnosed as mild aorto-right atrial fistula, 47 patients as moderate, and 15 patients as severe. Thirty-seven patients underwent follow-up CT.Among them, 10 patients with mild to moderate aorto-right atrial fistula were considered to have complete regression, 8 patients with mild aorto-right atrial fistula considered to have incomplete regression, 14 patients with mild to moderate aorto-right atrial fistula considered to have stable condition, and 5 patients with moderate aorto-right atrial fistula considered to have progression at the 3-month follow-up. Conclusion: CT is a useful tool for defining aorto-right atrial fistula after AVR or ascending aortic replacement and for evaluating it in follow-up. (authors)

  10. Ultrasonic delineation of aortic microstructure: The relative contribution of elastin and collagen to aortic elasticity

    Science.gov (United States)

    Marsh, Jon N.; Takiuchi, Shin; Lin, Shiow Jiuan; Lanza, Gregory M.; Wickline, Samuel A.

    2004-05-01

    Aortic elasticity is an important factor in hemodynamic health, and compromised aortic compliance affects not only arterial dynamics but also myocardial function. A variety of pathologic processes (e.g., diabetes, Marfan's syndrome, hypertension) can affect aortic elasticity by altering the microstructure and composition of the elastin and collagen fiber networks within the tunica media. Ultrasound tissue characterization techniques can be used to obtain direct measurements of the stiffness coefficients of aorta by measurement of the speed of sound in specific directions. In this study we sought to define the contributions of elastin and collagen to the mechanical properties of aortic media by measuring the magnitude and directional dependence of the speed of sound before and after selective isolation of either the collagen or elastin fiber matrix. Formalin-fixed porcine aortas were sectioned for insonification in the circumferential, longitudinal, or radial direction and examined using high-frequency (50 MHz) ultrasound microscopy. Isolation of the collagen or elastin fiber matrices was accomplished through treatment with NaOH or formic acid, respectively. The results suggest that elastin is the primary contributor to aortic medial stiffness in the unloaded state, and that there is relatively little anisotropy in the speed of sound or stiffness in the aortic wall.

  11. Endovascular aortic repair: first twenty years.

    Science.gov (United States)

    Koncar, Igor; Tolić, Momcilo; Ilić, Nikola; Cvetković, Slobodan; Dragas, Marko; Cinara, Ilijas; Kostić, Dusan; Davidović, Lazar

    2012-01-01

    Endovascular aortic/aneurysm repair (EVAR) was introduced into clinical practice at the beginning of the nineties. Its fast development had a great influence on clinicians, vascular surgeons and interventional radiologists, educational curriculums, patients, industry and medical insurance. The aim of this paper is to present the contribution of clinicians and industry to the development and advancement of endovascular aortic repair over the last 20 years. This review article presents the development of EVAR by focusing on the contribution of physicians, surgeons and interventional radiologists in the creation of the new field of vascular surgery termed hybrid vascular surgery, and also the contribution of technological advancement by a significant help of industrial representatives--engineers and their counselors. This article also analyzes studies conducted in order to compare the successfulness of EVAR with up-to-now applied open surgical repair of aortic aneurysms, and some treatment techniques of other aortic diseases. During the first two decades of its development the EVAR method was rapidly progressing and was adopted concurrently with the expansion of technology. Owing to large randomized studies, early and long-term results indicate specific complications of this method, thus influencing further technological improvement and defining risk patients groups in whom the use of the technique should be avoided. Good results are insured only in centers, specialized in vascular surgery, which have on their disposal adequate conditions for solving all complications associated with this method. PMID:23350259

  12. Natural history of abdominal aortic aneurysm

    DEFF Research Database (Denmark)

    Perko, M J; Schroeder, T V; Olsen, P S;

    1993-01-01

    During a 10-year period in which 735 patients presented with abdominal aortic aneurysms to our clinic, 63 were not offered operative treatment. The primary reason for choosing conservative treatment was concomitant diseases that increased the risk of operation. After 2 years of followup, half of ...

  13. [Ascending-descending Aortic Bypass and Aortic Valve Replacement for Aortic Coarctation with Bicuspid Aortic Valve and an Aberrant Right Subclavian Artery;Report of a Case].

    Science.gov (United States)

    Asano, Ryota; Nakano, Kiyoharu; Kodera, Kojiro; Sato, Atsuhiko; Kataoka, Go; Tatsuishi, Wataru; Kubota, Sayaka; Namiki, Shigetaka; Suzuki, Seiya

    2015-08-01

    A 53-year-old woman was developed congestive heart failure. She was diagnosed as having aortic coarctation, incompetent bicuspid aortic valve and an aberrant right subclavian artery by using echocardiography and enhanced computed tomography. Ankle brachial pressure index(ABI)in the right was 0.71 and 0.69 in the left. Blood pressure of the right arm was 60 mmHg lower than that of the left arm. To avoid perioperative adverse cardiac events due to a 2-staged operation, we performed ascending-descending aortic bypass and aortic valve replacement simultaneously through a median sternotomy. The heart was retracted cranially, and a vascular prosthesis was anastomosed to the descending aorta just above the diaphragm in an end-to-side manner. Then the graft was placed curvilinearly around the right atrium and was anastomosed to the ascending aorta. After the operation, the right and left ABI increased to 0.90 and 0.98 respectively. There was no pressure difference between the arms. The postoperative course was uneventful. PMID:26329712

  14. Global Strain in Severe Aortic Valve Stenosis

    DEFF Research Database (Denmark)

    Dahl, Jordi S; Videbæk, Lars; Poulsen, Mikael K;

    2012-01-01

    Score, history with ischemic heart disease and ejection fraction. CONCLUSIONS: -In patients with symptomatic severe aortic stenosis undergoing AVR reduced GLS provides important prognostic information beyond standard risk factors. Clinical Trial Registration-URL: http://www.clinicaltrial.gov. Unique identifier...

  15. Outcomes After Elective Aortic Aneurysm Repair

    DEFF Research Database (Denmark)

    de la Motte, L; Jensen, L P; Vogt, K;

    2013-01-01

    OBJECTIVE: To assess outcomes after treatment for asymptomatic abdominal aortic aneurysm (AAA) in Denmark in a period when both open surgery (OR) and endoluminal repair (EVAR) have been routine procedures. METHODS: We performed a retrospective nationwide cohort study of patients treated for asymp...

  16. Idiopathic Aortic Root to Right Atrial Fistula.

    Science.gov (United States)

    Campisi, Salvatore; Cluzel, Armand; Vola, Marco; Fuzellier, Jean Francois

    2016-06-01

    An aorta to right atrium fistula is rare. We report a case of idiopathic aortic root to right atrial fistula with right heart failure and review the literature. doi: 10.1111/jocs.12751 (J Card Surg 2016;31:373-375). PMID:27109166

  17. Multimodality Imaging Approach towards Primary Aortic Sarcomas Arising after Endovascular Abdominal Aortic Aneurysm Repair: Case Series Report.

    Science.gov (United States)

    Kamran, Mudassar; Fowler, Kathryn J; Mellnick, Vincent M; Sicard, Gregorio A; Narra, Vamsi R

    2016-06-01

    Primary aortic neoplasms are rare. Aortic sarcoma arising after endovascular aneurysm repair (EVAR) is a scarce subset of primary aortic malignancies, reports of which are infrequent in the published literature. The diagnosis of aortic sarcoma is challenging due to its non-specific clinical presentation, and the prognosis is poor due to delayed diagnosis, rapid proliferation, and propensity for metastasis. Post-EVAR, aortic sarcomas may mimic other more common aortic processes on surveillance imaging. Radiologists are rarely knowledgeable about this rare entity for which multimodality imaging and awareness are invaluable in early diagnosis. A series of three pathologically confirmed cases are presented to display the multimodality imaging features and clinical presentations of aortic sarcoma arising after EVAR. PMID:26721588

  18. Endovascular treatment of thoracic aortic diseases

    Directory of Open Access Journals (Sweden)

    Davidović Lazar

    2013-01-01

    Full Text Available Bacground/Aim. Endovascular treatment of thoracic aortic diseases is an adequate alternative to open surgery. This method was firstly performed in Serbia in 2004, while routine usage started in 2007. Aim of this study was to analyse initial experience in endovacular treatment of thoracic aortic diseses of three main vascular hospitals in Belgrade - Clinic for Vascular and Endovascular Surgery of the Clinical Center of Serbia, Clinic for Vascular Surgery of the Military Medical Academy, and Clinic for Vascular Surgery of the Institute for Cardiovascular Diseases “Dedinje”. Methods. Between March 2004. and November 2010. 41 patients were treated in these three hospitals due to different diseases of the thoracic aorta. A total of 21 patients had degenerative atherosclerotic aneurysm, 6 patients had penetrating aortic ulcer, 6 had posttraumatic aneurysm, 4 patients had ruptured thoracic aortic aneurysm, 1 had false anastomotic aneurysm after open repair, and 3 patients had dissected thoracic aneurysm of the thoracoabdominal aorta. In 15 cases the endovascular procedure was performed as a part of the hybrid procedure, after carotidsubclavian bypass in 4 patients and subclavian artery transposition in 1 patient due to the short aneurysmatic neck; in 2 patients iliac conduit was used due to hypoplastic or stenotic iliac artery; in 5 patients previous reconstruction of abdominal aorta was performed; in 1 patient complete debranching of the aortic arch, and in 2 patients visceral abdominal debranching were performed. Results. The intrahospital mortality rate (30 days was 7.26% (3 patients with ruptured thoracic aneurysms died. Endoleak type II in the first control exam was revealed in 3 patients (7. 26%. The patients were followed up in a period of 1-72 months, on average 29 months. The most devastating complication during a followup period was aortoesofageal fistula in 1 patient a year after the treatment of posttraumatic aneurysm. Conversion was

  19. Insulin pump (image)

    Science.gov (United States)

    The catheter at the end of the insulin pump is inserted through a needle into the abdominal ... with diabetes. Dosage instructions are entered into the pump's small computer and the appropriate amount of insulin ...

  20. Proton pump inhibitors

    Science.gov (United States)

    Proton pump inhibitors (PPIs) are medicines that work by reducing the amount of stomach acid made by glands in ... Proton pump inhibitors are used to: Relieve symptoms of acid reflux, or gastroesophageal reflux disease (GERD). This is a ...

  1. Proton pump inhibitors

    Science.gov (United States)

    Proton pump inhibitors (PPIs) are medicines that work by reducing the amount of stomach acid made by ... Proton pump inhibitors are used to: Relieve symptoms of acid reflux, or gastroesophageal reflux disease (GERD). This ...

  2. Burn Injury Arise From Flying Balloon Toys

    Directory of Open Access Journals (Sweden)

    Yalcin Kulahci

    2007-08-01

    Full Text Available Many of peoples are faced minor or major burn injuries in their life. Even the most widespread burn cause is flame injuries, too different burn cause pointed out in literature like Acetylen burns. The cases which imply in literature, mostly causes from explosion of high pressure acetylene tube, metal oxygene patch flame or carbide lamp using from cave explorers. An interesting acetylene burn cause in Turkey was publised by the authors. This cases was to come into being from flying toy balloons flame. 80 person was injured from flying toy ballons flame in a meeting in 2002. Although this potential risks of acetylene, helium have not any of some risk. But helium was provided from other countries and have more price. The injuries which caused from acetylene burns like 1st -2nd degree burns. Consequently that was known helium is more avaliable for using in toy sector, and never cause burn injuries like this. [TAF Prev Med Bull. 2007; 6(4: 291-296

  3. Balloon catheter dilatation of benign urethral strictures

    International Nuclear Information System (INIS)

    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

  4. Ballooning mode spectrum in general toroidal systems

    Energy Technology Data Exchange (ETDEWEB)

    Dewar, R.L.; Glasser, A.H.

    1982-04-01

    A WKB formalism for constructing normal modes of short-wavelength ideal hydromagnetic, pressure-driven instabilities (ballooning modes) in general toroidal magnetic containment devices with sheared magnetic fields is developed. No incompressibility approximation is made. A dispersion relation is obtained from the eigenvalues of a fourth order system of ordinary differential equations to be solved by integrating along a line of force. Higher order calculations are performed to find the amplitude equation and the phase change at a caustic. These conform to typical WKB results. In axisymmetric systems, the ray equations are integrable, and semiclassical quantization leads to a growth rate spectrum consisting of an infinity of discrete eigenvalues, bounded above by an accumulation point. However, each eigenvalue is infinitely degenerate. In the nonaxisymmetric case, the rays are unbounded in a four dimensional phase space, and semiclassical quantization breaks down, leading to broadening of the discrete eigenvalues and accumulation point of the axisymmetric case into continuum bands. Analysis of a model problem indicates that the broadening of the discrete eigenvalues is numerically very small, the dominant effect being broadening of the accumulation point.

  5. Alpha particle effects on MHD ballooning

    International Nuclear Information System (INIS)

    During the period, as the first step towards the goal of detail understanding of the effects of alpha particle on MHD Ballooning Modes, a new numerical approach to investigate the stability of low-frequency fluctuations in high temperature tokamaks was developed by solving the gyrokinetic equations for the ion and electron directly as an initial value problem. The advantage of this approach is the inclusion of many important kinetic features of the problem without approximations and computationally more economical than particle-pushing simulation. The ion-temperature-gradient-mode was investigated to benchmark this new simulation technique. Previous results in literature were recovered. Both the adiabatic electron model and the full drift-kinetic electron model are studied. Numerical result shows that the full drift-kinetic electron model is more unstable. The development of subcycling technique to handle the fast electron bounce time is particularly significant to apply this new approach to the alpha particle problem since alpha particle bounce frequency is also significantly higher than the mode frequency. This new numerical technique will be the basis of future study of the microstability in high temperature tokamaks with alpha particles (or any energetic species). 15 refs., 13 figs

  6. Transcatheter aortic valve implantation today and tomorrow.

    Science.gov (United States)

    Wenaweser, Peter; Praz, Fabien; Stortecky, Stefan

    2016-01-01

    Aortic stenosis is the most common valvular heart disease in Western industrial countries (including Switzerland) with a prevalence of about 5% in the population aged 75 and over. If left untreated, symptomatic patients have a rate of death of more than 50% within 2 years. As a result of age and elevated surgical risk, an important proportion of elderly patients are not referred to surgery. Thus, the introduction of transcatheter aortic valve implantation (TAVI) in 2002 has initiated a paradigm shift in the treatment of patients with symptomatic, severe aortic stenosis. The early technical and procedural success of this minimal invasive treatment in high-risk patients has promoted further innovation and development of transcatheter heart valve (THV) systems during the last 13 years. Downsizing of the delivery catheters along with technical improvements aiming to reduce postprocedural paravalvular regurgitation have resulted in a significant reduction in mortality. As a consequence, TAVI is nowadays established as safe and effective treatment for selected inoperable and high-risk patients. Ongoing studies are investigating the outcome of intermediate risk patients allocated to either surgical aortic valve replacement (SAVR) or TAVI. Despite these advancements, some specific areas of concern still require attention and need further investigations including conduction disturbances, valve degeneration and antithrombotic management. Although the off-label use of TAVI devices in the mitral, tricuspid or pulmonary position has recently developed, important limitations still apply and careful patient selection remains crucial. This review aims to summarise the available clinical evidence of transcatheter aortic valve treatment during the last 13 years and to provide a glimpse of future technologies. PMID:26999727

  7. Coronary Ostial Stenosis after Aortic Valve Replacement

    Science.gov (United States)

    Ziakas, Antonios G.; Economou, Fotios I.; Charokopos, Nicholas A.; Pitsis, Antonios A.; Parharidou, Despina G.; Papadopoulos, Thomas I.; Parharidis, Georgios E.

    2010-01-01

    Coronary ostial stenosis is a rare but potentially serious sequela after aortic valve replacement. It occurs in the left main or right coronary artery after 1% to 5% of aortic valve replacement procedures. The clinical symptoms are usually severe and may appear from 1 to 6 months postoperatively. Although the typical treatment is coronary artery bypass grafting, patients have been successfully treated by means of percutaneous coronary intervention. Herein, we present the cases of 2 patients in whom coronary ostial stenosis developed after aortic valve replacement. In the 1st case, a 72-year-old man underwent aortic valve replacement and bypass grafting of the saphenous vein to the left anterior descending coronary artery. Six months later, he experienced a non-ST-segment-elevation myocardial infarction. Coronary angiography revealed a critical stenosis of the right coronary artery ostium. In the 2nd case, a 78-year-old woman underwent aortic valve replacement and grafting of the saphenous vein to an occluded right coronary artery. Four months later, she experienced unstable angina. Coronary angiography showed a critical left main coronary artery ostial stenosis and occlusion of the right coronary artery venous graft. In each patient, we performed percutaneous coronary intervention and deployed a drug-eluting stent. Both patients were asymptomatic on 6-to 12-month follow-up. We attribute the coronary ostial stenosis to the selective ostial administration of cardioplegic solution during surgery. We conclude that retrograde administration of cardioplegic solution through the coronary sinus may reduce the incidence of postoperative coronary ostial stenosis, and that stenting may be an efficient treatment option. PMID:20844624

  8. Photovoltaic pump systems

    Science.gov (United States)

    Klockgether, J.; Kiessling, K. P.

    1983-09-01

    Solar pump systems for the irrigation of fields and for water supply in regions with much sunshine are discussed. For surface water and sources with a hoisting depth of 12 m, a system with immersion pumps is used. For deep sources with larger hoisting depths, an underwater motor pump was developed. Both types of pump system meet the requirements of simple installation and manipulation, safe operation, maintenance free, and high efficiency reducing the number of solar cells needed.

  9. Percutaneous transcatheter aortic valve implantation for degenerated surgical bioprostheses: the first case series in Asia with one-year follow-up

    Science.gov (United States)

    Chiam, Paul Toon Lim; Ewe, See Hooi; Soon, Jia Lin; Ho, Kay Woon; Sin, Yong Koong; Tan, Swee Yaw; Lim, Soo Teik; Koh, Tian Hai; Chua, Yeow Leng

    2016-01-01

    INTRODUCTION Percutaneous transcatheter aortic valve implantation (TAVI) has become an established therapy for inoperable and high-surgical-risk patients with severe aortic stenosis. Although TAVI in patients with degenerated surgical aortic bioprostheses (i.e. valve-in-valve TAVI) is increasingly reported in Western studies, such data is lacking in Asian patients. We describe the initial experience of valve-in-valve TAVI in Asia. METHODS Eight patients who underwent valve-in-valve TAVI due to degenerated aortic bioprostheses were enrolled. The mechanism of bioprosthetic valve failure was stenotic, regurgitation or mixed. All procedures were performed via transfemoral arterial access, using the self-expanding CoreValve prosthesis or balloon-expandable SAPIEN XT prosthesis. RESULTS The mean age of the patients was 71.6 ± 13.2 years and five were male. Mean duration to surgical bioprosthesis degeneration was 10.2 ± 4.1 years. Valve-in-valve TAVI was successfully performed in all patients. CoreValve and SAPIEN XT prostheses were used in six and two patients, respectively. There were no deaths, strokes or permanent pacemaker requirement at 30 days, with one noncardiac mortality at one year. All patients experienced New York Heart Association functional class improvement. Post-procedure mean pressure gradients were 20 ± 11 mmHg and 22 ± 8 mmHg at 30 days and one year, respectively. Residual aortic regurgitation (AR) of more than mild severity occurred in one patient at 30 days. At one year, only one patient had mild residual AR. CONCLUSION In our experience of valve-in-valve TAVI, procedural success was achieved in all patients without adverse events at 30 days. Good clinical and haemodynamic outcomes were sustained at one year. PMID:27193081

  10. Breast milk - pumping and storing

    Science.gov (United States)

    ... a comfortable chair, sink, and electric pump. If pumping at work is going to be hard, build ... up your milk supply. Wash your hands before pumping. Collect breast milk when pumping. You can use: ...

  11. Drive Mechanisms for Peeling-Ballooning Modes and Implications for Kinetic Ballooning Modes

    Science.gov (United States)

    Lunniss, Amelia; Wilson, Howard; Snyder, Phil

    2015-11-01

    The EPED model of the H-mode pedestal in tokamak plasmas combines a kinetic ballooning mode (KBM) criterion for the critical pressure gradient with a non-local peeling-ballooning (P-B) mode stability criterion to provide an integrated picture of pedestal structure and ELMs. Employing a set of model tokamak equilibria with pedestal gradients constrained by the KBM criterion, we explore the P-B stability for different pedestal widths. The narrowest widths, corresponding to early in the ELM cycle, are stable. Once a critical width is realised, an intermediate-n P-B mode is destabilised, which we show to be driven by a combination of the kink and curvature contributions to δW, exceeding field line bending. Although formally of O(n-1) , we show that the kink term survives to very large n because of steep current density gradients in the pedestal. This kink term is not presently retained in gyro-kinetic codes, but may be important for an accurate prediction of the KBM stability criterion in realistic low collisionality tokamak pedestals. This project has received part funding from the European Union's Horizon 2020 research and innovation programme under grant agreement number 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

  12. Development of a super-pressure balloon with a diamond-shaped net --- result of a ground inflation test of a 2,000 cubic-meter balloon ---

    Science.gov (United States)

    Saito, Yoshitaka; Nakashino, Kyoichi; Akita, Daisuke; Matsushima, Kiyoho; Shimadu, Shigeyuki; Goto, Ken; Hashimoto, Hiroyuki; Matsuo, Takuma

    2016-07-01

    A light super-pressure balloon has been developed using a method to cover a balloon with a diamond-shaped net of high-tensile fibers. The goal is to fly a payload of 900 kg to the altitude of 37 km with a 300,000 m^{3} balloon. Beginning from a demonstration test of the net-balloon with a 10 m^{3} balloon in 2010, we have been polished the net-balloon through ground inflation tests and flight tests, including a flight test of a 3,000 m ^{3} balloon in the tandem balloon configuration with a 15,000 m^{3} zero-pressure balloon in 2012, and a flight test of a 10 m^{3} balloon in the tandem balloon configuration with a 2 kg rubber balloon in 2013, as reported in the last COSPAR. In 2014, we developed a 5,000 m^{3} balloon and performed a ground inflation test to find that the balloon burst from a lip panel for termination with a differential pressure of 425 Pa. It was due to a stress concentration at the edge of a thick tape attached along the termination mechanism. In 2015, we modified the balloon by adding tapes on the lip panel to avoid the stress concentration, and also shorten the net length to leave some margin of the film and performed a ground inflation test again to find the balloon showed asymmetrical deployment and burst from the edge of the net with a differential pressure of 348 Pa. We consider it is due to the margin of the film along the circumferential direction, and proposed a gore shape which circumference length is kept as determined by the pumpkin shape of the balloon but setting meridian length longer than that. We developed a 10 m^{3} balloon with the gore design to find that the balloon deployed symmetrically and showed the burst pressure of 10,000 Pa. In 2016, we are going to develop a 2,000 m^{3} balloon with the gore design and perform its ground inflation test. In this paper, we are going to report its result with the sequence of the development.

  13. Internal pump monitoring device

    International Nuclear Information System (INIS)

    In the present invention, a thermometer is disposed at the upper end of an internal pump casing of a coolant recycling system in a BWR type reactor to detect leakage of reactor water thereby ensuring the improvement of reliability of the internal pump. Namely, a thermometer is disposed, which can detect temperature elevation occurred when water in the internal pump leaked from a reactor pressure vessel passes through the gap between a stretch tube and an upper end of the pump casing. Signals from the thermometer are transmitted to a signal processing device by an instrumentation cable. The signal processing device generates an alarm when the temperature signal exceeds a predetermined value and announces that leakage of reactor water occurs in the internal pump. Since the present invention can detect the leakage of the reactor water in the pump casing in an early stage, it can contribute to the improvement of the safety and reliability of the internal pump. (I.S.)

  14. Fluid dynamics of aortic root dilation in Marfan syndrome

    CERN Document Server

    Querzoli, Giorgio; Espa, Stefania; Costantini, Martina; Sorgini, Francesca

    2014-01-01

    Aortic root dilation and propensity to dissection are typical manifestations of the Marfan Syndrome (MS), a genetic defect leading to the degeneration of the elastic fibres. Dilation affects the structure of the flow and, in turn, altered flow may play a role in vessel dilation, generation of aneurysms, and dissection. The aim of the present work is the investigation in-vitro of the fluid dynamic modifications occurring as a consequence of the morphological changes typically induced in the aortic root by MS. A mock-loop reproducing the left ventricle outflow tract and the aortic root was used to measure time resolved velocity maps on a longitudinal symmetry plane of the aortic root. Two dilated model aortas, designed to resemble morphological characteristics typically observed in MS patients, have been compared to a reference, healthy geometry. The aortic model was designed to quantitatively reproduce the change of aortic distensibility caused by MS. Results demonstrate that vorticity released from the valve ...

  15. [Use of sutureless prosthetic aortic valves in cardiac surgery].

    Science.gov (United States)

    Santarpino, Giuseppe; Fischlein, Theodor

    2014-03-01

    In the last years, an increasing proportion of high-risk patients undergo surgical aortic valve replacement. In order to reduce the risk associated with cross-clamp time or cardioplegic ischemic time, sutureless aortic prostheses have been developed. These bioprosthetic valves are not hand sewn, and this technological advance translates into reduced implantation times, thus improving outcome of patients referred for aortic valve replacement. At present, three sutureless bioprostheses are available on the market: 3f Enable (Medtronic Inc., Minneapolis, Minnesota, USA), Perceval (Sorin Group, Saluggia, Italy) and Intuity (Edwards Lifesciences, Irvine, California, USA). This article provides an overview of the available literature on sutureless aortic valves with the aim to better define current role and future perspectives of sutureless aortic bioprostheses for the treatment of aortic valve stenosis. PMID:24770430

  16. Diagnosis of aortic aneurysms by scintigraphy and ultrasonography

    Energy Technology Data Exchange (ETDEWEB)

    Caille, G. (Centre Hospitalier, Saint-Nazaire (France)); Chatal, J.F.; Tellier, J.L.; Talmant, C.; Guihard, R. (Centre Rene-Gauducheau, 44 - Nantes (France))

    1981-10-01

    Angioscintigraphy, performed on 50 patients suspected of aortic aneurysm and complemented by abdominal ultrasonography in 31 cases, disclosed: - Three cases of thoracic aortic aneurysm, 2 of which were confirmed by arteriography and surgery. It was impossible to perform surgery in the third case, no arteriography was done. Strict agreement with standard thoracic images had made the angioscintigraphic diagnosis seem correct. Twenty-seven cases of abdominal aortic aneurysms were confirmed by arteriography or surgery. Ultrasonography disclosed an abdominal aortic aneurysm in 26 cases, 20 of which were confirmed. The agreement of the two procedures in 10 unconfirmed cases led us to consider the diagnosis as correct. Angioscintigraphy appears to be a reliable procedure for detecting thoracic and abdominal aortic aneurysms. Ultrasonography is the simplest and least costly procedure for study of abdominal aortic aneurysms.

  17. Diagnosis of aortic aneurysms by scintigraphy and ultrasonography

    International Nuclear Information System (INIS)

    Angioscintigraphy, performed on 50 patients suspected of aortic aneurysm and complemented by abdominal ultrasonography in 31 cases, disclosed: - Three cases of thoracic aortic aneurysm, 2 of which were confirmed by arteriography and surgery. It was impossible to perform surgery in the third case, no arteriography was done. Strict agreement with standard thoracic images had made the angioscintigraphic diagnosis seems correct. - Twenty-seven cases of abdominal aortic aneurysms confirmed by arteriography or surgery. Ultrasonography disclosed an abdominal aortic aneurysm in 26 cases, 20 of which were confirmed. The agreement of the two procedures in 10 unconfirmed cases led us to consider the diagnosis as correct. Angioscintigraphy appears to be a reliable procedure for detecting thoracic and abdominal aortic aneurysms. Ultrasonography is the simplest and least costly procedure for study of abdominal aortic aneurysms

  18. 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.

  19. Time-dependent strains and stresses in a pumpkin balloon

    Science.gov (United States)

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

    2006-01-01

    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 distribution 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 material, the hoop strains increase and the meridional stresses decrease, whereas the 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 the visco-elastic response of the gore material:

  20. Complexity Analysis of Balloon Drawing for Rooted Trees

    CERN Document Server

    Lin, Chun-Cheng; Poon, Sheung-Hung; Fan, Jia-Hao

    2010-01-01

    In a balloon drawing of a tree, all the children under the same parent are placed on the circumference of the circle centered at their parent, and the radius of the circle centered at each node along any path from the root reflects the number of descendants associated with the node. Among various styles of tree drawings reported in the literature, the balloon drawing enjoys a desirable feature of displaying tree structures in a rather balanced fashion. For each internal node in a balloon drawing, the ray from the node to each of its children divides the wedge accommodating the subtree rooted at the child into two sub-wedges. Depending on whether the two sub-wedge angles are required to be identical or not, a balloon drawing can further be divided into two types: even sub-wedge and uneven sub-wedge types. In the most general case, for any internal node in the tree there are two dimensions of freedom that affect the quality of a balloon drawing: (1) altering the order in which the children of the node appear in...

  1. Restenosis following balloon dilation of benign esophageal stenosis

    Institute of Scientific and Technical Information of China (English)

    Ying-Sheng Cheng; Ming-Hua Li; Ren-Jie Yang; Hui-Zhen Zhang; Zai-Xian Ding; Qi-Xin Zhuang; Zhi-Ming Jiang; Ke-Zhong Shang

    2003-01-01

    AIM: To elucidate the mechanism of restenosis following balloon dilation of benign esophageal stenosis.METHODS: A total of 49 rats with esophageal stenosis were induced in 70 rats using 5 ml of 50 % sodium hydroxide solution and the double-balloon method, and an esophageal restenosis (RS) model was developed by esophageal stenosis using dilation of a percutaneous transluminal coronary angioplasty (PTCA) balloon catheter. These 49 rats were divided into two groups: rats with benign esophageal stricture caused by chemical burn only (control group, n=21) and rats with their esophageal stricture treated with balloon catheter dilation (experimental group, n=28). Imaging analysis and immunohistochemistry were used for both quantitative and qualitative analyses of esophageal stenosis and RS formation in the rats, respectively.RESULTS: Cross-sectional areas and perimeters of the esophageal mucosa layer, muscle layer, and the entire esophageal layers increased significantly in the experimental group compared with the control group. Proliferating cell nuclear antigen (PCNA) was expressed on the 5th day after dilation, and was still present at 1 month. Fibronectin (FN)was expressed on the 1st day after dilation, and was still present at 1 month.CONCLUSION: Expression of PCNA and FN plays an important role in RS after balloon dilation of benign esophageal stenosis.

  2. What is the role of intra-aortic balloon counterpulsation in acute myocardial infarction presenting without shock?

    OpenAIRE

    Divaka Perera; Kalpa De Silva

    2012-01-01

    Percutaneous coronary intervention (PCI) in the presence of impaired left ventricular function is associated with significant mortality and morbidity, principally the underlying coronary artery disease (CAD) subtends a large proportion of viable myocardium. The consequences of the ischaemic cascade are particularly marked in this subset of patients, whose diminished physiological reserve renders them less able to withstand the consequences of ischemia or arrhythmias occurring during a PCI pro...

  3. Development of Ultra-Thin Polyethylene Balloons for High Altitude Research upto Mesosphere

    Science.gov (United States)

    Kumar, B. Suneel; Nagendra, N.; Ojha, D. K.; Peter, G. Stalin; Vasudevan, R.; Anand, D.; Kulkarni, P. M.; Reddy, V. Anmi; Rao, T. V.; Sreenivasan, S.

    Ever since its inception four decades back, Balloon Facility of Tata Institute of Fundamental Research (TIFR), Hyderabad has been functioning with the needs of its user scientists at its focus. During the early nineties, when the X-ray astronomy group at TIFR expressed the need for balloons capable of carrying the X-ray telescopes to altitudes up to 42 km, the balloon group initiated research and development work on indigenous balloon grade films in various thickness not only for the main experiment but also in parallel, took up the development of thin films in thickness range 5 to 6 μm for fabrication of sounding balloons required for probing the stratosphere up to 42 km as the regular 2000-gram rubber balloon ascents could not reach altitudes higher than 38 km. By the year 1999, total indigenization of sounding balloon manufacture was accomplished. The work on balloon grade ultra-thin polyethylene film in thickness range 2.8 to 3.8 μm for fabrication of balloons capable of penetrating mesosphere to meet the needs of user scientists working in the area of atmospheric dynamics commenced in 2011. Pursuant to the successful trials with 61,000-m3 balloon made of 3.8-μm Antrix film reaching stratopause (48 km) for the first time in the history of balloon facility in the year 2012, fine tuning of launch parameters like percentage free lift was carried out to take the same volume balloons to higher mesospheric altitudes. Three successful flights with a total suspended load of 10 kg using 61,000-m3 balloons were carried out in the month of January 2014 and all the three balloons crossed into the mesosphere reaching altitudes of over 51 km. All the balloons flown so far are closed system with no escape ducts. Balloon fabrication, development of launch hardware, flight control instruments and launch technique for these mesospheric balloon flights are discussed in this paper.

  4. Recent developments for surgical aortic valve replacement: the concept of sutureless valve technology

    OpenAIRE

    Carrel, Thierry; Englberger, Lars; Stalder, Mario

    2013-01-01

    Aortic stenosis has become the most frequent type of valvular heart disease in Europe and North America and presents in the large majority of patients as calcified aortic stenosis in adults of advanced age. Surgical aortic valve replacement has been recognized to be the definitive therapy which improves considerably survival for severe aortic stenosis since more than 40 years. In the most recent period, operative mortality of isolated aortic valve replacement for aortic stenosis varies betwee...

  5. Aortic incompetence in HLA B27-positive juvenile arthritis.

    OpenAIRE

    Kean, W F; Anastassiades, T. P.; Ford, P M

    1980-01-01

    The early onset of isolated aortic incompetence in a male child with HLA B27 and peripheral arthritis is reported. Acute anterior uveitis and lone aortic incompetence occurred at 1 and 9 months respectively after the development of the acute inflammatory arthritis. The uveitis resolved with local therapy and the arthritis remitted 10 months after the onset. There has been no recurrence of the arthritis after 10 years of close follow-up but the aortic incompetence has persisted, though it rema...

  6. Use of omental pedicles in mycotic abdominal aortic aneurysm repair

    OpenAIRE

    Alibhai, M.K.; Samee, A; Ahmed, M.; Duffield, R.

    2011-01-01

    We report a case of a sixty year old man with a mycotic infra-renal abdominal aortic aneurysm complicated by a left psoas abscess. After treatment with parenteral antibiotics he underwent early aortic reconstruction with an in-situ prosthetic graft wrapped in an omental pedicle. Mycotic abdominal aortic aneurysms can be treated in this way despite the potential for graft infection from persisting retroperitoneal sepsis.

  7. DEGENERATIVE AORTIC STENOSIS: PATHOGENESIS AND NEW PRINCIPLES OF TREATMENT

    OpenAIRE

    O. V. Andropova; V. N. Anokhin

    2016-01-01

    Aim. To reveal of markers of inflammation and progression of calcification in patients with degenerative aortic stenosis (DAS). Material and methods. A single-stage study was done in 85 patients with degenerative calcification of aortic valve (42 patients with DAS and 43 patients without DAS). The techniques for assessing the severity of aortic valve calcification included ultrasonic diagnostics and multislice spiral computed tomography. Markers of inflammation and lipid profile were investig...

  8. Temporal trends in the incidence and prognosis of aortic stenosis

    DEFF Research Database (Denmark)

    Martinsson, Andreas; Li, Xinjun; Andersson, Charlotte;

    2015-01-01

    BACKGROUND: The aging of Western populations is expected to result in increasing occurrence of aortic stenosis (AS), but data are limited. Recent studies have reported declining incidence and mortality for other major heart diseases. We aimed to study temporal trends in the incidence and prognosis...... could suggest that improved risk factor control and cardiovascular therapy, combined with increased use of aortic valve replacement in the elderly and reduced perioperative mortality in aortic valve replacement, have translated into favorable effects for AS....

  9. Transcatheter aortic valve prosthesis surgically replaced 4 months after implantation

    DEFF Research Database (Denmark)

    Thyregod, Hans Gustav; Lund, Jens Teglgaard; Engstrøm, Thomas;

    2010-01-01

    Transcatheter aortic valve implantation is a new and rapidly evolving treatment option for high-risk surgical patients with degenerative aortic valve stenosis. Long-term results with these new valve prostheses are lacking, and potential valve dysfunction and failure would require valve replacemen....... We report the first case of surgical valve replacement in a patient with a dysfunctional transcatheter-implanted aortic valve prosthesis 4 months after implantation....

  10. Giant aortic arch aneurysm complicating Kawasaki′s disease

    OpenAIRE

    Kaouthar Hakim; Rafik Boussada; Lilia Chaker; Fatma Ouarda

    2014-01-01

    Kawasaki disease (KD) is a common acute vasculitis in pediatric population that usually involves small- and middle-sized arteries, commonly coronary arteries. Although the incidence and natural course of coronary aneurysms after KD are well documented in studies, related reports on peripheral arterial and aortic aneurysms are scarce. We report the occurrence of a giant aortic aneurysm involving the horizontal part of aortic arch in a 28-month-old boy diagnosed with KD. This complication was m...

  11. Aortic stiffness: pathophysiology, clinical implications, and approach to treatment

    OpenAIRE

    Sethi S; Rivera O.; Oliveros R; Chilton R

    2014-01-01

    Salil Sethi, Oscar Rivera, Rene Oliveros, Robert Chilton University of Texas Health Science Center, San Antonio, TX, USA Abstract: Aortic stiffness is a hallmark of aging, and classic cardiovascular risk factors play a role in accelerating this process. Current changes in medicine, which focus on preventive care, have led to a growing interest in noninvasive evaluation of aortic stiffness. Aortic stiffness has emerged as a good tool for further risk stratification because it has been linked ...

  12. Aortic root dynamics and surgery: from craft to science

    OpenAIRE

    Cheng, Allen; Dagum, Paul; Miller, D. Craig

    2007-01-01

    Since the fifteenth century beginning with Leonardo da Vinci's studies, the precise structure and functional dynamics of the aortic root throughout the cardiac cycle continues to elude investigators. The last five decades of experimental work have contributed substantially to our current understanding of aortic root dynamics. In this article, we review and summarize the relevant structural analyses, using radiopaque markers and sonomicrometric crystals, concerning aortic root three-dimensiona...

  13. Tubercular mycotic aortic aneurysm: A case report

    Directory of Open Access Journals (Sweden)

    Satish Kumar

    2016-01-01

    Full Text Available Tubercular aneurysms of larger vessels, particularly the aorta is very rare. The first case of tubercular involvement of the aorta in the form of aortitis was reported in 1882 by Weigert and the first case of tubercular mycotic aneurysm of the aorta was reported in 1895. The preoperative diagnosis of tubercular aortic aneurysm is difficult. Even at surgery, determining the tubercular nature of the lesion is problematic. The gross appearance may not be distinctive, and acid-fast stains are unlikely to be performed. We report the case of a young female patient who was started on antitubercular treatment for pleural effusion and was found to have aortic aneurysm, which later on proved to be tubercular in origin.

  14. Spontaneous aortic dissecting hematoma in two dogs.

    Science.gov (United States)

    Boulineau, Theresa Marie; Andrews-Jones, Lydia; Van Alstine, William

    2005-09-01

    This report describes 2 cases of spontaneous aortic dissecting hematoma in young Border Collie and Border Collie crossbred dogs. Histology was performed in one of the cases involving an unusual splitting of the elastin present within the wall of the aorta, consistent with elastin dysplasia as described in Marfan syndrome in humans. The first case involved a young purebred Border Collie that died suddenly and the second case involved a Border Collie crossbred dog that died after a 1-month history of seizures. Gross lesions included pericardial tamponade with dissection of the ascending aorta in the former case and thoracic cavity hemorrhage, mediastinal hematoma, and aortic dissection in the latter. Histologic lesions in the case of the Border Collie crossbred dog included a dissecting hematoma of the ascending aorta with elastin dysplasia and right axillary arterial intimal proliferation. PMID:16312247

  15. Evaluation of a physiologic pulsatile pump system for neonate-infant cardiopulmonary bypass support.

    Science.gov (United States)

    Undar, A; Masai, T; Inman, R; Beyer, E A; Mueller, M A; McGarry, M C; Frazier, O H; Fraser, C D

    1999-01-01

    An alternate physiologic pulsatile pump (PPP) system was designed and evaluated to produce sufficient pulsatility during neonate-infant open heart surgery. This hydraulically driven pump system has a unique "dual" pumping chamber mechanism. The first chamber is placed between the venous reservoir and oxygenator and the second chamber between the oxygenator and patient. Each chamber has two unidirectional tricuspid valves. Stroke volume (0.2-10 ml), upstroke rise time (10-350 msec), and pump rate (2-250 beats per minute [bpm]) can be adjusted independently to produce adequate pulsatility. This system has been tested in 3-kg piglets (n = 6), with a pump flow of 150 ml/kg/min, a pump rate of 150 bpm, and a pump ejection time of 110 msec. After initiation of cardiopulmonary bypass (CPB), all animals were subjected to 25 minutes of hypothermia to reduce the rectal temperatures to 18 degrees C, 60 minutes of deep hypothermic circulatory arrest (DHCA), then 10 minutes of cold perfusion with a full pump flow, and 40 minutes of rewarming. During CPB, mean arterial pressures were kept at less than 50 mm Hg. Mean extracorporeal circuit pressure (ECCP), the pressure drop of a 10 French aortic cannula, and the pulse pressure were 67+/-9, 21+/-6, and 16+/-2 mm Hg, respectively. All values are represented as mean+/-SD. No regurgitation or abnormal hemolysis has been detected during these experiments. The oxygenator had no damping effect on the quality of the pulsatility because of the dual chamber pumping mechanism. The ECCP was also significantly lower than any other known pulsatile system. We conclude that this system, with a 10 French aortic cannula and arterial filter, produces adequate pulsatility in 3 kg piglets. PMID:9952008

  16. Acute aortic dissection caused by Clostridium septicum aortitis.

    Science.gov (United States)

    Eplinius, Franziska; Hädrich, Carsten

    2014-11-01

    Clostridium septicum aortitis is a rare cause of aortic dissection. So far, only 28 cases have been described in literature before. Most of these cases occurred in elderly patients and an association to colonic neoplasms and/or atherosclerosis has been witnessed frequently. Here we report the case of a 32-year-old man with fatal aortic dissection due to aortic infection with C. septicum. Beside a case of a 22-year-old man who died of aortic dissection due to C. septicum aortitis this is the second case of C. septicum aortitis in a young individual with no signs of colonic neoplasms or atherosclerosis. PMID:25242573

  17. FOXE3 mutations predispose to thoracic aortic aneurysms and dissections

    Science.gov (United States)

    Kuang, Shao-Qing; Medina-Martinez, Olga; Guo, Dong-chuan; Gong, Limin; Regalado, Ellen S.; Reynolds, Corey L.; Boileau, Catherine; Jondeau, Guillaume; Prakash, Siddharth K.; Kwartler, Callie S.; Zhu, Lawrence Yang; Peters, Andrew M.; Duan, Xue-Yan; Bamshad, Michael J.; Shendure, Jay; Nickerson, Debbie A.; Santos-Cortez, Regie L.; Dong, Xiurong; Leal, Suzanne M.; Majesky, Mark W.; Swindell, Eric C.; Jamrich, Milan; Milewicz, Dianna M.

    2016-01-01

    The ascending thoracic aorta is designed to withstand biomechanical forces from pulsatile blood. Thoracic aortic aneurysms and acute aortic dissections (TAADs) occur as a result of genetically triggered defects in aortic structure and a dysfunctional response to these forces. Here, we describe mutations in the forkhead transcription factor FOXE3 that predispose mutation-bearing individuals to TAAD. We performed exome sequencing of a large family with multiple members with TAADs and identified a rare variant in FOXE3 with an altered amino acid in the DNA-binding domain (p.Asp153His) that segregated with disease in this family. Additional pathogenic FOXE3 variants were identified in unrelated TAAD families. In mice, Foxe3 deficiency reduced smooth muscle cell (SMC) density and impaired SMC differentiation in the ascending aorta. Foxe3 expression was induced in aortic SMCs after transverse aortic constriction, and Foxe3 deficiency increased SMC apoptosis and ascending aortic rupture with increased aortic pressure. These phenotypes were rescued by inhibiting p53 activity, either by administration of a p53 inhibitor (pifithrin-α), or by crossing Foxe3–/– mice with p53–/– mice. Our data demonstrate that FOXE3 mutations lead to a reduced number of aortic SMCs during development and increased SMC apoptosis in the ascending aorta in response to increased biomechanical forces, thus defining an additional molecular pathway that leads to familial thoracic aortic disease. PMID:26854927

  18. Aortic Disease in the Young: Genetic Aneurysm Syndromes, Connective Tissue Disorders, and Familial Aortic Aneurysms and Dissections

    Directory of Open Access Journals (Sweden)

    Marcelo Cury

    2013-01-01

    Full Text Available There are many genetic syndromes associated with the aortic aneurysmal disease which include Marfan syndrome (MFS, Ehlers-Danlos syndrome (EDS, Loeys-Dietz syndrome (LDS, familial thoracic aortic aneurysms and dissections (TAAD, bicuspid aortic valve disease (BAV, and autosomal dominant polycystic kidney disease (ADPKD. In the absence of familial history and other clinical findings, the proportion of thoracic and abdominal aortic aneurysms and dissections resulting from a genetic predisposition is still unknown. In this study, we propose the review of the current genetic knowledge in the aortic disease, observing, in the results that the causative genes and molecular pathways involved in the pathophysiology of aortic aneurysm disease remain undiscovered and continue to be an area of intensive research.

  19. Animal Models of Calcific Aortic Valve Disease

    OpenAIRE

    Sider, Krista L.; Blaser, Mark C.; Simmons, Craig A.

    2011-01-01

    Calcific aortic valve disease (CAVD), once thought to be a degenerative disease, is now recognized to be an active pathobiological process, with chronic inflammation emerging as a predominant, and possibly driving, factor. However, many details of the pathobiological mechanisms of CAVD remain to be described, and new approaches to treat CAVD need to be identified. Animal models are emerging as vital tools to this end, facilitated by the advent of new models and improved understanding of the u...

  20. Diagnostic imaging of abdominal aortic aneurysms

    International Nuclear Information System (INIS)

    The survey explains the available methods for diagnostic imaging of aortic aneurysms, i.e. the conventional methods of ultrasonography and intra-arterial angiography as well as the modern tomographic and image processing techniques such as CT, DSA, and MRT. The various methods are briefly discussed with respect to their sensitivity and specificity. The authors expect that MRI will become the modality of choice, due to absence of radiation exposure of the patients