Astudillo, R; Farell, J; Ariza, H; González Carmona, V M; Abundes, A; Tello, R; López Cuellar, M
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
Wollersheim, Laurens W.; Li, Wilson W.; van der Meulen, Jan; de Mol, Bas A.
We describe a case of a 76-year old male who presented with progressive dyspnoea. He underwent an aortic valve replacement with a Freedom SOLO bioprosthesis 6 years ago. Transthoracic echocardiography showed a moderate-to-severe leakage of the Freedom SOLO bioprosthesis. During surgical reintervention, a partial tear of the left coronary cusp was seen from the commissure of the right coronary cusp to its base. After radiographic and microscopic examination, no clear cause was found for the failure of this Freedom SOLO bioprosthesis. To our knowledge, this is the third failure of a Freedom SOLO bioprosthesis reported in the literature. When the long-term follow-up of the Freedom SOLO bioprosthesis is available, it has to be compared with other bioprosthesis for long-term durability. PMID:24144803
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.
Verhoye, Jean-philippe; Harmouche, Majid; Soulami, Reda Belhaj; Thebault, Christophe; Boulmier, Dominique; Leguerrier, Alain; Anselmi, Amedeo
The valve-in-valve (ViV) procedure is an option for patients with symptomatic structural degeneration of a bioprosthesis and excessive reoperative risk. The risk of coronary obstruction appears to be increased if ViV is performed for certain pericardial prostheses in which the leaflets are mounted outside the stent posts. Herein is described a successful ViV for a degenerated Trifecta aortic bioprosthesis, and the technical considerations for performing a ViV procedure within such types of prosthesis are considered. Emphasis is placed on the importance of preoperative investigations (computed tomography scan-based measurements of coronary ostial height and of sinus of Valsalva diameters), and on the precise deployment of the valve (transapical approach with transesophageal echocardiography control) to minimize the risk of major complications. The presence of a failing Trifecta bioprosthesis should not be considered an absolute contraindication to ViV on the basis of the risk of coronary obstruction. PMID:26897821
Walter J. Gomes
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.
Ussia, Gian Paolo; Quadri, Arshad; Cammalleri, Valeria;
bioprosthesis and 30-day follow-up. METHODS AND RESULTS: The procedure was performed percutaneously, without any left extracorporeal circulatory support. The patient had severe mitral regurgitation with severely depressed ventricular function and other comorbidities. The patient was deemed extreme high risk...... echocardiography and fluoroscopy were utilised for device positioning and deployment. The mitral valve prosthesis was implanted with mild mitral regurgitation. The postoperative course was uneventful and at 30-day follow-up the patient is in NYHA Class I, with good function of the mitral valve bioprosthesis...
Agathos, E Andreas; Tomos, Periklis; Lachanas, Elias; Gakiopoulou, Harikleia; Pantopoulou, Alkystis; Perrea, Despina
Tracheal replacement has been a challenging problem for thoracic surgeons for over half of a century. We evaluated the in-vivo performance of a new tracheal bioprosthesis derived from Harp seal (Phoca groelandica) trachea that was fixed and preserved in 0.625% buffered glutaraldehyde solution for 3 months. Ten young male pigs weighing 27-32 kg (mean, 28.7 kg) underwent replacement of a tracheal segment with this new bioprosthesis. The length of replaced trachea was 1.8-2.4 cm (mean, 2.17 cm), representing 2-3 cartilage rings. All pigs survived the operation uneventfully. No immunosuppression drugs were used. The pigs eventually developed dyspnea and were euthanized on postoperative day 17-39 (mean, 30.8 days). Macroscopic and histological analysis showed an intact bioprosthesis but near-total occlusion of the native trachea by a ring of inflammatory infiltration at the site of distal anastomosis. More experiments involving a different concentration of the preservation agent, different management, and perhaps the use of bioengineering techniques are needed to improve the performance of this novel bioprosthesis. PMID:21149405
Loor, Gabriel; Schuster, Andres; Cruz, Vincent; Rafael, Aldo; Stewart, William J.; Diaz, James; McCurry, Kenneth
Background The Carpentier-Edwards Perimount Magna mitral valve bioprosthesis (Edwards Lifesciences, Irvine, CA) is a low-profile version of the earlier Perimount valve that uses the ThermaFix process for enhanced calcium removal. The Magna valve has been in use since 2008, yet no publication, until now, has verified its intermediate-term safety and efficacy. Methods From 2008 through 2011 (our 4-year study period), 70 Magna valves were implanted in the mitral position at a single institution ...
@@ A favorite question in Doctors and Patients is,"What valve would you use for patient?And what kind of valve suits me better in my life?Would you use a mechanical prosthesis,a bioprosthesis? Numerous studies show that there are many safe choices and that the operation has to be individualized to the patient.Factors such as the patient's lifestyle,age,need for or contraindication to anticoagulation and potential for longevity must be taken into account.
Sean Guo-Dong Tan; Sangho Kim; Jimmy Kim Fatt Hon; Hwa Liang Leo
Prior studies have shown that in a healthy heart, there exist a large asymmetric vortex structure that aids in establishing a steady flow field in the left ventricle. However, the implantation of existing artificial heart valves at the mitral position is found to have a negative effect on this physiological flow pattern. In light of this, a novel D-shaped bileaflet porcine bioprosthesis (GD valve) has been designed based on the native geometry mitral valve, with the hypothesis that biomimicry...
Philippart, Raphael; Brunet-Bernard, Anne; Clementy, Nicolas; Bourguignon, Thierry; Mirza, Alain; Angoulvant, Denis; Babuty, Dominique; Lip, Gregory Y H; Fauchier, Laurent
Vitamin K antagonists are currently recommended in patients with 'valvular' atrial fibrillation (AF), e. g. those having mitral stenosis or artificial heart valves. We compared thromboembolic risk in patients with 'non valvular' AF and in those with AF and biological valve replacement (valve bioprosthesis). Among 8962 AF patients seen between 2000 and 2010, a diagnosis of 'non-valvular AF' was found in 8053 (94 %). Among patients with 'valvular' AF, 549 (6 %) had a biological prosthesis. The patients with bioprosthesis were older and had a higher CHA2DS2-VASc score than those with non valvular AF. After a follow-up of 876 ± 1048 days (median 400 days, interquartile range 12-1483), the occurrence of thromboembolic events was similar in AF patients with bioprosthesis compared to those with 'non valvular' AF (hazard ratio [HR] 1.10 95 % confidence interval [CI] 0.83-1.45, p=0.52, adjusted HR 0.93, 95 %CI 0.68-1.25, p=0.61). Factors independently associated with increased risk of stroke/TE events were older age (HR 1.25, 95 %CI 1.16-1.34 per 10-year increase, p< 0.0001) and higher CHA2DS2-VASc score (HR 1.35, 95 %CI 1.24-1.46, p< 0.0001) whilst female gender (HR 0.75, 95 %CI 0.62-0.90, p=0.002), use of vitamin K antagonist (HR 0.83, 95 %CI 0.71-0.98, p=0.03) were independently associated with a lower risk of stroke/TE. Neither the presence of bioprosthesis nor the location of bioprosthesis was independent predictor for TE events. In conclusion, AF patients with bioprosthesis had a non-significantly higher risk of stroke/TE events compared to patients with non-valvular AF. Second, the CHA2DS2-VASc score was independently associated with an increased risk of TE events, and was a valuable determinant of TE risk both in AF patients with non-valvular AF as well as those with bioprosthesis, whether treated or not treated with OAC. PMID:26843425
Celiento, Michele; Blasi, Stefania; De Martino, Andrea; Pratali, Stefano; Milano, Aldo D.
We reviewed the cases of 100 patients (mean age, 73 ± 10 yr; 64 men) who had mitral valve replacement with a Medtronic Mosaic porcine bioprosthesis from 1995 through 2011. The mean New York Heart Association (NYHA) class was 3 ± 0.7, and 52 patients were in atrial fibrillation. Prosthetic sizes were chiefly 27 mm (50 patients) and 29 mm (40 patients). Follow-up ended in December 2012 and is 97% complete, with a cumulative duration of 611 patient-years (mean duration, 6 ± 4.6 yr; maximum, 17.7 yr). The early mortality rate was 10% (6% in elective patients); late deaths occurred in 31 patients (5 valve-related). Actuarial survival rates at 5, 10, and 15 years were 74% ± 5%, 50% ± 6%, and 37% ± 8%. The mean NYHA class in survivors was 1.4 ± 0.6 (P actuarial freedom at 15 years of 91% ± 5%. No cases of endocarditis were observed. Four patients needed reoperation, 2 for structural failure, and 1 each for perivalvular leakage and valve thrombosis. Actuarial freedom from structural failure and from reoperation, respectively, was 93% ± 5% and 91% ± 5% at 15 years. Echocardiographic follow-up in 24 patients with 27-mm prostheses showed a mean gradient of 5 ± 1.7 mmHg and an effective orifice area of 1.57 ± 0.3 cm2; in 16 patients with 29-mm prostheses, the mean gradient was 4.5 ± 1.9 mmHg, and the effective orifice area, 1.63 ± 0.4 cm2. During nearly 17 years of follow-up, the Mosaic bioprosthesis has shown good overall clinical and hemodynamic performance after mitral valve replacement. PMID:27047280
Celiento, Michele; Blasi, Stefania; De Martino, Andrea; Pratali, Stefano; Milano, Aldo D; Bortolotti, Uberto
We reviewed the cases of 100 patients (mean age, 73 ± 10 yr; 64 men) who had mitral valve replacement with a Medtronic Mosaic porcine bioprosthesis from 1995 through 2011. The mean New York Heart Association (NYHA) class was 3 ± 0.7, and 52 patients were in atrial fibrillation. Prosthetic sizes were chiefly 27 mm (50 patients) and 29 mm (40 patients). Follow-up ended in December 2012 and is 97% complete, with a cumulative duration of 611 patient-years (mean duration, 6 ± 4.6 yr; maximum, 17.7 yr). The early mortality rate was 10% (6% in elective patients); late deaths occurred in 31 patients (5 valve-related). Actuarial survival rates at 5, 10, and 15 years were 74% ± 5%, 50% ± 6%, and 37% ± 8%. The mean NYHA class in survivors was 1.4 ± 0.6 (P <0.0001). Thromboembolic episodes occurred in 4 patients, with an actuarial freedom at 15 years of 91% ± 5%. No cases of endocarditis were observed. Four patients needed reoperation, 2 for structural failure, and 1 each for perivalvular leakage and valve thrombosis. Actuarial freedom from structural failure and from reoperation, respectively, was 93% ± 5% and 91% ± 5% at 15 years. Echocardiographic follow-up in 24 patients with 27-mm prostheses showed a mean gradient of 5 ± 1.7 mmHg and an effective orifice area of 1.57 ± 0.3 cm(2); in 16 patients with 29-mm prostheses, the mean gradient was 4.5 ± 1.9 mmHg, and the effective orifice area, 1.63 ± 0.4 cm(2). During nearly 17 years of follow-up, the Mosaic bioprosthesis has shown good overall clinical and hemodynamic performance after mitral valve replacement. PMID:27047280
Tan, Sean Guo-Dong; Kim, Sangho; Hon, Jimmy Kim Fatt; Leo, Hwa Liang
Prior studies have shown that in a healthy heart, there exist a large asymmetric vortex structure that aids in establishing a steady flow field in the left ventricle. However, the implantation of existing artificial heart valves at the mitral position is found to have a negative effect on this physiological flow pattern. In light of this, a novel D-shaped bileaflet porcine bioprosthesis (GD valve) has been designed based on the native geometry mitral valve, with the hypothesis that biomimicry in valve design can restore physiological left ventricle flow patterns after valve implantation. An in-vitro experiment using two dimensional particle velocimetry imaging was carried out to determine the hemodynamic performance of the new bileaflet design and then compared to that of the well-established St. Jude Epic valve which functioned as a control in the experiment. Although both valves were found to have similar Reynolds shear stress and Turbulent Kinetic Energy levels, the novel D-shape valve was found to have lower turbulence intensity and greater mean kinetic energy conservation. PMID:27258099
Sean Guo-Dong Tan
Full Text Available Prior studies have shown that in a healthy heart, there exist a large asymmetric vortex structure that aids in establishing a steady flow field in the left ventricle. However, the implantation of existing artificial heart valves at the mitral position is found to have a negative effect on this physiological flow pattern. In light of this, a novel D-shaped bileaflet porcine bioprosthesis (GD valve has been designed based on the native geometry mitral valve, with the hypothesis that biomimicry in valve design can restore physiological left ventricle flow patterns after valve implantation. An in-vitro experiment using two dimensional particle velocimetry imaging was carried out to determine the hemodynamic performance of the new bileaflet design and then compared to that of the well-established St. Jude Epic valve which functioned as a control in the experiment. Although both valves were found to have similar Reynolds shear stress and Turbulent Kinetic Energy levels, the novel D-shape valve was found to have lower turbulence intensity and greater mean kinetic energy conservation.
Fiorina, Claudia, E-mail: email@example.com [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)
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.
Mário O Vandrecic
,6% ± 4,9 (2 em 55 pts. A maioria dos pacientes encontrase em classe funcional I e II. O seguimento desses pacientes é feito trimestralmente, através de exame clínico, ecodopplercardiografia e análises sangüíneas. Durante esse período de 13 meses de seguimento, não foi detectada nenhuma alteração decorrente do uso desta nova bioprótese. Embora o tempo de seguimento tenha sido curto, pode-se observar que a natureza do tratamento químico realizado na bioprótese foi bem tolerada. À luz dos resultados experimentais satisfatórios na obtenção de um tratamento que atenue a calcificação, prolongando a durabilidade, os autores justificam a necessidade de estudos controlados na busca do substituto valvular ideal.Clinical results with the use of porcine bioprosthesis are satisfactory from the standpoint of hemodynamic performance, low incidence of thromboembolysm providing adequate quality of life. Calcification and tissue tear remain the major complications of bioprosthesis , mainly in children and young patients. Several stratergies were proposed to control or even to avoid calcification; up to the present, none of them have proved to decrease calcification or to prolong their durability. This controlled clinical study was undertaken based upon the quality of anticalcificant effect of the P.S. treatment obtained in animal implants with the Biocor porcine bioprosthesis; the negative results of toxicological analysis of the treated tissue and the good performance in fatigue testing of the P.S. treated Biocor bioprosthesis. The rational of the P.S. treatment is to obtain covalent bounds of the anticalcificant agent to the tissue, in more durable form. From February/1991 to March/1992, 66 treated bioprosthesis were implanted in 55 patients; there were 28 males and 27 femeles. The age ranged from 11 to 68 years. There were 72.7 ± 11.8 of patients below 30 years of age. Mean age was 26.6. Rheumatic heart disease was the etiological factor in 70.9% ± 12.0. Regular
Furukawa, Koji; Sakaguchi, Shuhei; Nakamura, Eisaku; Yano, Mitsuhiro
An 83-year-old woman diagnosed with hypertrophic obstructive cardiomyopathy was referred to our hospital. Her echocardiogram revealed diffuse left ventricular hypertrophy, severe mitral valve regurgitation with systolic anterior motion of the mitral valve, and left ventricular obstruction with a peak outflow gradient of 142 mmHg. Cardiac catheterization revealed a peak pressure gradient of 60 mmHg across the left ventricular outflow tract. Because of the patient's advanced age, as well as uncertainty regarding our ability to resolve her mitral regurgitation, we performed mitral valve replacement with a St. Jude Medical Epic porcine low-profile bioprosthesis in combination with septal myectomy. The patient's postoperative course was uneventful. At 1 year after the operation, her functional status was New York Heart Association class I. The echocardiogram showed the peak outflow gradient markedly decreased to 9 mmHg. PMID:26066877
Mateus W. De Bacco
Full Text Available FUNDAMENTO: Identificação de fatores de risco pré-operatórios na cirurgia cardíaca valvar visa melhor resultado cirúrgico pela possível neutralização de condições relacionadas com morbi-mortalidade aumentada. OBJETIVO: Este estudo objetiva identificar fatores de risco hospitalar em pacientes submetidos a implante de bioprótese de pericárdio bovino. MÉTODOS: Estudo retrospectivo incluindo 703 pacientes consecutivos submetidos a implante de pelo menos uma bioprótese de pericárdio bovino St. Jude Medical-Biocor® de setembro de 1991 a dezembro de 2005 no Instituto de Cardiologia do RS, sendo 392 aórticos, 250 mitrais e 61 mitro-aórticos. Analisadas as características sexo, idade, índice de massa corporal, classe funcional (New York Heart Association - NYHA, fração de ejeção, lesão valvar, hipertensão arterial sistêmica, diabete melito, função renal, arritmias cardíacas, cirurgia cardíaca prévia, revascularização miocárdica, plastia tricúspide e caráter eletivo, de urgência ou de emergência da cirurgia. Desfecho primordial foi mortalidade hospitalar. Utilizou-se regressão logística para examinar relação entre fatores de risco e mortalidade hospitalar. RESULTADOS: Ocorreram 101 (14,3% óbitos hospitalares. Características significativamente relacionadas à mortalidade aumentada foram sexo feminino (p 2,4mg/dl (p=0,004, classe funcional IV (pBACKGROUND: Identification of preoperative heart valve surgery risk factors aim to improve surgical outcomes with the possibility to offset conditions related to increased morbidity and mortality. OBJECTIVE: Intent of this study is to identify hospital risk factors in patients undergoing bovine pericardial bioprosthesis implantation. METHODS: Retrospective study including 703 consecutive patients who underwent implantation of at least one St. Jude Medical-Biocor™ bovine pericardial bioprosthesis between September 1991 and December 2005 at the Rio Grande do Sul
Henrique B Furtado
Full Text Available De setembro de 1982 a dezembro de 1987, foram estudados 73 pacientes submetidos a cirurgia de substituição valvar com implante de prótese biológica Bioval. A idade variou de 8 a 67 anos (média de 41 anos, sendo 36 do sexo feminino. Destes, 39 (53,42% foram submetidos a cirurgia para implante de prótese mitral, 25 (34,2% aórtica 5 (8,2% pacientes eram mitro-aórtiticos 2 (3,5% aórtico-coronarianos e 1 (1,8% mitro-coronariano. Doença reumática foi a etiologia mais comum (72,6%, seguida da degeneração mixomatosa (16,4%. Quatro pacientes foram operados na vigência de endocardite infecciosa. A mortalidade hospitalar foi de 5,4% e a análise atuarial revelou 2,7 óbitos/100 pacientes/ano. Um paciente com fibrilação atrial (FA crônica e átrio esquerdo (AE muito volumoso apresentou trombose de AE envolvendo a prótese e 1 paciente do sexo feminino, jovem, aprsentou calcificação leve da prótese. Conclui-se que os resultados clínicos com a utilização dessa prótese foram absolutamente satisfatórios.The authors present the results of the utilization of Bioval bovine pericardium bioprosthesis in 73 patients operated upon in Bauru, SP. from September 1982 to December 1987. Thirty nine patients had mitral disease, 25 aortic, 6 both mitral and aortic, 2 had aortic and coronary disease and 1, mitral and coronary disease. The hospital mortality was 5.4% and none of them was valve related. There were only one patient with atrial thrombus and 1 patient with mild mitral calcification, which didn't require re-operation. Actuarial survival in 60 months follow-up was 82% for total, 88% for mitral and 78% for aortic patients. Late death was 2.7 events/100 patients/year. In conclusion, this prosthesis had a very good performance in this group of patients.
Reflections on the 24 years durability of an isolate tricuspid bovine pericardium IMC/Braile bioprosthesis Reflexões sobre a durabilidade de 24 anos de uma bioprótese IMC/Braile de pericárdio bovino em posição tricúspide isolada
Full Text Available We were challenged by the experience of one patient reoperation for a bioprosthetic bovine pericardium degenerative stenosis, 24 years after implantation. This bioprosthesis was implanted due to tricuspid valve bacterial staphylococcal endocarditis after septic abortion.Vivenciamos a experiência de reoperar uma paciente por estenose degenerativa de uma prótese biológica de pericárdio bovino, após 24 anos de implante. Essa prótese degenerada havia sido implantada devido à destruição da valva tricúspide por endocardite bacteriana estafilocócica após aborto séptico.
Fatores de risco hospitalar para pacientes submetidos à substituição valvar com a bioprótese porcina em instituição universitária Risk factors for hospital mortality in valve replacement with porcine bioprosthesis at an universitary institution
Ana Carolina Tieppo Fornari
Full Text Available OBJETIVO: Identificar fatores de risco hospitalar em pacientes submetidos ao implante de bioprótese porcina no Instituto de Cardiologia do Rio Grande do Sul. MÉTODOS: Estudo retrospectivo, com informações de prontuário, de 808 pacientes submetidos ao implante de pelo menos uma bioprótese porcina St. Jude Medical Biocor, no período entre 1994 e 2009. Foi analisada a relação entre mortalidade hospitalar e características clínicas e demográficas definidas em estudos reconhecidos, visando identificar fatores de risco. Foram utilizados testes qui-quadrado, t de Student e regressão logística uni e multivariável (P 1,4 mg/dL (OR 2,28; cirurgia cardíaca prévia (OR 2,17; hipertensão arterial sistêmica (OR 1,93; classe funcional III e IV (OR 1,92; revascularização miocárdica (OR 1,81; idade > 70 anos (OR 1,80; insuficiência cardíaca congestiva (OR 1,73; e sexo feminino (OR 1,68. Pela regressão logística multivariável, para fatores independentes, identificados: lesão mitral (OR 5,29; plastia tricúspide (OR 3,07; diabete melito (OR 2,72; idade > 70 anos (OR 2,62; revascularização miocárdica (OR 2,43; cirurgia cardíaca prévia (OR 1,82; e hipertensão arterial sistêmica (OR 1,79. CONCLUSÕES: A mortalidade observada nesta casuística é compatível com literatura. Fatores de risco preponderantes são reconhecidos e devem motivar programas específicos de neutralização.OBJECTIVE: Study designed to identify characteristics of patients related to increased hospital mortality after valve replacement, assumed as risk factors. METHODS: Retrospective study including 808 patients submitted to the implant of St. Jude Biocor porcine bioprosthesis between 1994 and 2009 at Instituto de Cardiologia do Rio Grande do Sul. Primary outcome was hospital death and hospital mortality was related to demographic and surgical characteristics. Statistics include t-test, qui-square test and logistical regression analysis. RESULTS: There were 80 (9
Páez, J M; San Martin, A C; Sestafe, J V; Jorge-Herrero, E; Navidad, R; Cordón, A; Candela, I; Castillo-Olivares, J L
The mechanoelastic behavior of calf pericardium employed in cardiac bioprostheses was compared with that of three types of thread (Nylon, Prolene, and silk) used to suture this biological tissue. The elastic limit (EL) of each material was determined by means of tensile tests and the mathematical functions that govern the stress/strain curves within the EL have been described. The first derivative of these functions for each point to the curves allowed the immediate calculation of the elastic modulus (EM), which was considered the best parameter for comparing the elasticities of the materials being assessed. It was observed that the deformation of the pericardium produced by the working stress of a pericardial leaflet was approximately 1000 times greater than that produced in the surgical threads. When the elasticities were compared on the basis of the EM, that of pericardium was 749.06, 626.95, and 1253.17 times greater than that of the Nylon, Prolene, and silk suture threads, respectively. These results demonstrate that the interaction between these materials (pericardium and the threads) could be generating detrimental forces that can diminish the durability of the leaflets of the bioprostheses constructed of calf pericardium. PMID:8788105
Full Text Available Abstract Background The implantation of stentless valves is technically demanding and the outcome may depend on the performance of surgeons. We studied systematically the role of surgeons and other possible determinants for mid-term survival, postoperative gradients and Quality of Life (QoL after aortic valve replacement (AVR with Freestyle® stentless bioprostheses. Methods Between 1996 and 2003, 587 patients (mean 75 years underwent AVR with stentless Medtronic Freestyle® bioprostheses. Follow-up was 99% complete. Determinants of morbidity, mortality, survival time and QoL were evaluated by multiple, time-related, regression analysis. Risk models were built for all sections of the Nottingham Health Profile (NHP: energy, pain, emotional reaction, sleep, social isolation and physical mobility Results Actuarial freedom from aortic valve re-operation, structural valve deterioration, non-structural valve dysfunction, prosthetic valve endocarditis and thromboembolic events at 6 years were 95.9 ± 2.1%, 100%, 98.7 ± 0.5%, 97.0 ± 1.5%, 79.6 ± 4.3%, respectively. The actuarial freedom from bleeding events at 6 years was 93.1 ± 1.9%. Estimated survival at 6 years was similar to the age-matched German population (61.4 ± 3.8 %. Predictors of survival time were: diabetes mellitus, atrial fibrillation, peripheral vascular disease, renal dysfunction, female gender > 80 years and patients 0.7 for each of the 6 QoL sections. Early transvalvular gradients were identified as independent risk factors for impaired physical mobility (c-index 0.77, p Conclusion In addition to the valve size (in relation to body size, subcoronary technique (versus total root and various patient-related factors the risk of elevated gradients after stentless valve implantation depends, considerably on the individual surgeon. Although there was no effect on survival time and most aspects of QoL, higher postoperative transvalvular gradients affect physical mobility after AVR.
Domingo M Braile
Full Text Available A maioria dos implantes valvulares cardíacos realizados no Brasil é representada pelas válvulas de pericárdio bovino, seguidas por próteses porcinas. Na avaliação de válvulas biológicas, deve-se considerar: desempenho hidrodinámico, resistência à fadiga e processo de calcificação. No presente estudo, foi avaliado o desempenho hidrodinámico de biopróteses de pericárdio bovino (Biopro-PB-Braile Biomédica comparativamente às válvulas porcinas (Biopro-PP-Braile Biomédica através do gradiente médio transvalvular. Os testes hidrodinámicos foram realizados em próteses de diâmetros variando de 19 a 35 mm, submetidas ao Sistema Duplicador de Pulsos Shelhigh (Shelhigh Inc.. O volume de ejeção foi mantido constante em 90 ml, com freqüência de pulso de 60, 70,80, 90 e 100 ciclos por minuto, possibilitando fluxos entre 5 e 9 litros por minuto, equivalentes a fluxos contínuos aproximados de 8 a 18 litros por minuto. Houve tendência à diminuição dos gradientes pressóricos à medida em que aumenta o diâmetro externo das próteses. O gradiente pressórico médio encontrado em próteses de pericárdio bovino foi significativamente menor que o de próteses porcinas (pMost of the cardiac valve implantations in Brazil are represented by bovine pericardial valves, followed by the porcine prostheses. In the evaluation of biological valves, the following should be taken into consideration: hydrodynamic performance resistance to fatigue and calcification process. In this study, the hydrodynamic performance of bovine pericardial bioprostheses (Biopro-BP-Braile Biomedica was evaluated comparatively to porcine valves (Biopro-PP-Braile Biomedica, through the transvalvular medium gradient. The hydrodynamic tests were made on prostheses varying from 19 to 35 mm in diameter, which underwent the pulse duplicator system Shelhigh (Shelligh Inc.. The ejection volume was constantly kept at 90 ml. The pulse frequencies varied between 60 and 100 cycles per minute, allowing flows between 5 and 9 liters per minute, equivalent to approximate continuos flows of 8 to 18 liters per minute. There was tendency to decrease the gradients, in proportion to increase of the bioprostheses external diameters. The medium pressure gradient found in the bovine pericardial prostheses was significantly smaller than that in the porcine prostheses (p<0.01, for all diameters studied. Respecting the large variability of protocols of tests in the literature for hydrodynamic evaluation of valve prostheses, the necessity of standard tests becomes stronger, seeking adequate comparison among the several valves.
Mateus W. de Bacco; João Ricardo M. Sant'Anna; Gustavo de Bacco; Roberto T. Sant'Anna; Marisa F. Santos; Edemar Pereira; Altamiro Reis da Costa; Paulo Roberto Prates; Renato A. K. Kalil; Ivo A NESRALLA
FUNDAMENTO: Identificação de fatores de risco pré-operatórios na cirurgia cardíaca valvar visa melhor resultado cirúrgico pela possível neutralização de condições relacionadas com morbi-mortalidade aumentada. OBJETIVO: Este estudo objetiva identificar fatores de risco hospitalar em pacientes submetidos a implante de bioprótese de pericárdio bovino. MÉTODOS: Estudo retrospectivo incluindo 703 pacientes consecutivos submetidos a implante de pelo menos uma bioprótese de pericárdio bovino St. Jud...
Ohira, Suguru; Doi, Kiyoshi; Okawa, Kazunari; Yaku, Hitoshi
The stentless aortic bioprosthesis has been used because of its excellent hemodynamics and few valve-related complications. We report a case of redo aortic root replacement for severe aortic regurgitation and dilatation of the Valsalva sinus 7 years after the implantation of a Prima Plus aortic root bioprosthesis (Edwards LifeScience, Irvine, CA, USA) using a full root technique. Intraoperative findings showed the complete detachment of the commissure between the left and non-coronary cusps, and Valsalva sinus dilatation of the porcine aortic root bioprosthesis. Redo aortic root replacement with a 23-mm porcine bioprosthesis and 28-mm straight graft was performed. There were no findings of intimal tear, suture dehiscence, degeneration, and perforation of the bioprosthesis. Such complications associated with the Edwards Prima Plus aortic root bioprosthesis were rarely reported. Commissural detachment of a porcine stentless aortic bioprosthesis can occur; thus, careful follow-up involving echocardiography and computed tomography is necessary. PMID:25341962
Felipe W De Bacco; João Ricardo M. Sant'Anna; Roberto T. Sant'Anna; Paulo R. PRATES; Renato A. K. Kalil; Ivo A NESRALLA
OBJETIVO: Nosso objetivo é apresentar resultados a longo prazo da subsituição valvar por bioprótese de pericárdio bovino SJM-BiocorTM. MÉTODO: Entre 1992 e 2000, tiveram alta hospitalar, após substituição valvar por bioprótese de pericárdio bovino SJM-BiocorTM 304 pacientes. Idades eram de 15 a 83 anos (média: 60,6±14,3), sendo 50,3% do sexo masculino. Pacientes tiveram situação clínica atualizada e análise atuarial foi empregada no cálculo da sobrevida simples e livre de eventos. RESU...
Ben Zhang; Xiang Chen; Tong-yi Xu; Zhi-gang Zhang; Xin Li; Lin Han; Zhi-yun Xu
Background Since 2000, transcatheter pulmonary valve replacement has steadily advanced. However, the available prosthetic valves are restricted to bioprosthesis which have defects like poor durability. Polymeric heart valve is thought as a promising alternative to bioprosthesis. In this study, we introduced a novel polymeric transcatheter pulmonary valve and evaluated its feasibility and safety in sheep by a hybrid approach. Methods We designed a novel polymeric trileaflet transcatheter pulmo...
Mariscalco, Giovanni; Mariani, Silvia; Bichi, Samuele; Biondi, Andrea; Blasio, Andrea De; Borsani, Paolo; Corti, Fabrizio; Chiara, Benedetta De; Gherli, Riccardo; Leva, Cristian; Russo, Claudio Francesco; Tasca, Giordano; Vanelli, Paolo; Alfieri, Ottavio; Antona, Carlo
Background The Trifecta aortic bioprosthesis (St. Jude Medical, Inc., St. Paul, MN, USA) is a stented pericardial heart valve with excellent preliminary results. Aim of the study was to evaluate its early clinical and hemodynamic performances in a multicenter regional registry. Methods Between January 2011 and June 2012, 178 consecutive patients undergoing aortic valve replacement with the Trifecta bioprosthesis were prospectively enrolled at 9 Italian centers. Clinical and echocardiographic ...
Fatores de risco hospitalar para pacientes submetidos à substituição valvar com a bioprótese porcina em instituição universitária Risk factors for hospital mortality in valve replacement with porcine bioprosthesis at an universitary institution
Ana Carolina Tieppo Fornari; Luís Henrique Tieppo Fornari; Juan Victor Piccoli Soto Paiva; Pauline Elias Josende; João Ricardo Michelin Sant'Anna; Paulo Roberto Prates; Renato A. K. Kalil; Ivo A NESRALLA
OBJETIVO: Identificar fatores de risco hospitalar em pacientes submetidos ao implante de bioprótese porcina no Instituto de Cardiologia do Rio Grande do Sul. MÉTODOS: Estudo retrospectivo, com informações de prontuário, de 808 pacientes submetidos ao implante de pelo menos uma bioprótese porcina St. Jude Medical Biocor, no período entre 1994 e 2009. Foi analisada a relação entre mortalidade hospitalar e características clínicas e demográficas definidas em estudos reconhecidos, visando identif...
R.L.J. Osnabrugge (Ruben); S.V. Arnold (Suzanne); M.R. Reynolds (Matthew R.); E.A. Magnuson (Elizabeth); K.K. Wang (Kenneth); V.A. Gaudiani (Vincent A.); R. Stoler (Robert); T.A. Burdon (Thomas A.); N.S. Kleiman (Neal); M.J. Reardon (Michael); D.H. Adams (David H.); J.J. Popma (Jeffrey J.); D.J. Cohen (David J.)
textabstractObjectives The purpose of this study was to characterize health status outcomes after transcatheter aortic valve replacement (TAVR) with a self-expanding bioprosthesis among patients at extreme surgical risk and to identify pre-procedural patient characteristics associated with a poor ou
Spadaccio, Cristiano; Nappi, Francesco; De Marco, Federico; Sedati, Pietro; Sutherland, Fraser W.H.; Chello, Massimo; Trombetta, Marcella; Rainer, Alberto
In this study, we tested in vivo effectiveness of a previously developed poly-l-lactide/poly-ε-caprolactone armored vascular graft releasing heparin. This bioprosthesis was designed in order to overcome the main drawbacks of tissue-engineered vascular grafts, mainly concerning poor mechanical properties, thrombogenicity, and endothelialization. The bioprosthesis was successfully implanted in an aortic vascular reconstruction model in rabbits. All grafts implanted were patent at four weeks postoperatively and have been adequately populated by endogenous cells without signs of thrombosis or structural failure and with no need of antiplatelet therapy. The results of this preliminary study might warrant for further larger controlled in vivo studies to further confirm these findings. PMID:26949333
Bortolotti, U; Scioti, G; Milano, A; Guglielmi, C; Benedetti, M; Tartarini, G; Balbarini, A
We present 2 cases of tricuspid insufficiency following blunt chest trauma: 1 was diagnosed 5 months after the trauma and the other, 20 years after the trauma. In both patients, the tricuspid valve was replaced with a porcine bioprosthesis, because valve repair was not considered feasible. These cases emphasize the variability of clinical presentation of post-traumatic tricuspid valve insufficiency and indicate the need for close follow-up of patients after major thoracic trauma.
Kwon, Jin-Tae; Jung, Tae-Eun; Lee, Dong-Hyup
We report a case of acute thrombosis of bioprosthetic mitral valve in a 59 year–old Korean female, who underwent a mitral valve replacement with a 25 mm Carpentier - Edwards PERIMOUNT Plus bioprosthesis (Edwards Lifesciences, Inc.; Irvine, CA, USA) and a mini-Maze procedure for correction of mitral stenosis (MS) and atrial fibrillation (AF). On the 10th postoperative day, the patient began to complain of increasing dyspnea and general malaise. Her symptoms worsened and developed into pulmonar...
Chiam, Paul Toon-Lim; Ewe, See Hooi; Chua, Yeow Leng; Lim, Yean Teng
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...
Pang, Philip Y K; Chiam, Paul T L; Chua, Yeow Leng; Sin, Yoong Kong
Transcatheter aortic valve implantation (TAVI) has emerged as a viable alternative endovascular technique in selected patients with severe aortic stenosis, who are either inoperable or at high risk for surgical aortic valve replacement. We report a case of delayed displacement and rotation of an aortic bioprosthesis, 43 days after successful TAVI via the transfemoral approach, with the patient surviving the subsequent open heart surgery required for device retrieval. PMID:22228843
Croti Ulisses A.
Full Text Available A patient with tertiary syphilis presenting with bilateral coronary ostial lesions and aortic regurgitation underwent surgical reconstruction of the coronary ostia by the anterior approach with autogenous saphenous vein grafting and substitution of the aortic valve with a bovine bioprosthesis. The procedure was easily performed and had good outcomes both early and late. The rarity of the association of a lesion in both coronary ostia with aortic regurgitation in syphilis and the surgical technique employed are discussed.
Gaia, Diego Felipe; Breda, João Roberto; Fischer, Claudio Henrique; Palma, José Honório
A 60-year old male patient with multiple risk factors and two previous interventions over the mitral valve was admitted to the emergency unit with symptoms of cardiac failure. Initial examination revealed a competent mitral bioprosthesis with severe perivalvular mitral insufficiency. Based on previous experiences with transapical procedures, a transapical transcatheter closure of the perivalvular leak was performed. The apex was punctured with a 7 French introducer sheath, and a hydrophilic g...
Vavuranakis, Manolis; Vrachatis, Dimitrios A; Kariori, Maria G; Moldovan, Carmen; Kalogeras, Konstantinos; Lavda, Maria; Aznaouridis, Konstantinos; Stefanadis, Christodoulos
Very limited data exist on transcatheter aortic valve implantation (TAVI) in the setting of a preexisting mitral prosthesis regarding the technique, potential complications, and outcomes. Here, we report two cases of transfemoral TAVI with a self-expanding bioprosthesis (CoreValve; Medtronic, Inc) in patients who had previously undergone mitral valve replacement (one with an Omniscience and one with a St. Jude prosthesis). A brief literature review is also presented. PMID:25364003
Feld, H; Roth, J
Severe haemolytic anaemia developed in a 33 year old patient after the mitral valve was replaced with a St Jude medical prosthesis. This was the patient's third thoracotomy. She had already had a mitral commissurotomy and a mitral valve bioprosthesis. The patient had an E+ antibody to red blood cells as well as a paraprosthetic leak. The haemolysis became less severe once the population of E+ red cells was completely haemolysed. However, the patient continued to require transfusions to remain...
Nowadays transcatheter aortic valve implantation (TAVI) is an accepted alternative to surgical aortic valve replacement for high-risk patients (pts). Successful TAVI procedures for failed aortic surgical bioprosthesis (TAV-in-SAV) have already been reported. In the presented two cases of TAV-in-SAV implantation a strut distortion of the stent was revealed on angiographic imaging and confirmed on control CT scan. In both procedures, a dislocation of the medtronic core valve (MCV) prosthesis during implantation led to valve retrieval, with a necessity of reloading it in the 18F introducer before subsequent implantation of the same valve in correct position
Durand, Eric; Tron, Christophe; Eltchaninoff, Hélène
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
Souteyrand, Geraud, E-mail: firstname.lastname@example.org [Department of Cardiology, Gabriel Montpied Hospital, CHU Clermont-Ferrand, Clermont-Ferrand (France); ERIM-EA3295, University of Auvergne, Clermont-Ferrand (France); Wilczek, Krzysztof [Department of Cardiology, Medical University of Silesia, Silesian Centre for Herat Diseases, Zabrze (Poland); Innorta, Andrea; Camilleri, Lionel [Department of Cardiology, Gabriel Montpied Hospital, CHU Clermont-Ferrand, Clermont-Ferrand (France); ERIM-EA3295, University of Auvergne, Clermont-Ferrand (France); Chodor, Piotr [Department of Cardiology, Medical University of Silesia, Silesian Centre for Herat Diseases, Zabrze (Poland); Lusson, Jean-René; Motreff, Pascal [Department of Cardiology, Gabriel Montpied Hospital, CHU Clermont-Ferrand, Clermont-Ferrand (France); ERIM-EA3295, University of Auvergne, Clermont-Ferrand (France); Laborde, Jean-Claude [St. George' s Hospital, London (United Kingdom); Chabrot, Pascal; Durel, Nicolas [Department of Cardiology, Gabriel Montpied Hospital, CHU Clermont-Ferrand, Clermont-Ferrand (France); ERIM-EA3295, University of Auvergne, Clermont-Ferrand (France)
Nowadays transcatheter aortic valve implantation (TAVI) is an accepted alternative to surgical aortic valve replacement for high-risk patients (pts). Successful TAVI procedures for failed aortic surgical bioprosthesis (TAV-in-SAV) have already been reported. In the presented two cases of TAV-in-SAV implantation a strut distortion of the stent was revealed on angiographic imaging and confirmed on control CT scan. In both procedures, a dislocation of the medtronic core valve (MCV) prosthesis during implantation led to valve retrieval, with a necessity of reloading it in the 18F introducer before subsequent implantation of the same valve in correct position.
Full Text Available Prosthetic valve re-operation has greater mortality and morbidity than primary valve replacement. By recognition of factors influencing on causes of redo operation and preoperative survival, one can select appropriate prosthesis at primary valve replacement and when operation performed at appropriate time, surgical risk can be reduced."nMethods and Materials: Two hundred patients that underwent prosthetic valve re-operation from October 1991 through November 2001 were included in this study. There were 68 men and 132 women with the mean age of 42:tl 1.8 years. Structural failure was the commonest cause of bio-prosthesis replacement (93%. Valve thrombosis was the common cause of mechanical valve replacement (32%. Age younger Than 50 (P= 0.01 and interval after the first implantation more than 10 years (P= 0.01 affected bio-prosthesis degeneration."nResults: Atrial fibrillation (P<0.01, Older age especially more than 40 (P<0.05 and mitral position (P<0.01 affected mechanical valve thrombosis. Cross clamp time (P= 0.005, Tricuspid insufficiency (P = 0.001, NYHA IV (P = 0.005 and emergent operation (P= 0.001 were independent determinants of hospital mortality."nConclusion: In conclusion, in patients with more than 10-years life expectancy and age younger than 50, mechanical valve can be selected for primary valve replacement. If operation performed before patients reach deteriorated condition, preoperative survival would be excellent.
Virgilio Tattini Jr
Full Text Available Bovine pericardium bioprosthesis has become a commonly accepted device for heart valve replacement. Present practice relies on the measurement of shrinkage temperature, observed as a dramatic shortening of tissue length. Several reports in the last decade have utilized differential scanning calorimetry (DSC as an alternative method to determine the shrinkage temperature, which is accompanied by the absorption of heat, giving rise to an endothermic peak over the shrinkage temperature range of biological tissues. Usually, freeze-drying microscope is used to determine collapse temperature during the lyophilization of solutions. On this experiment we used this technique to study the shrinkage event. The aim of this work was to compare the results of shrinkage temperature obtained by DSC with the results obtained by freeze-drying microscopy. The results showed that both techniques provided excellent sensitivity and reproducibility, and gave information on the thermal shrinkage transition via the thermodynamical parameters inherent of each method.
Pasrija, Chetan; Mohammed, Isa; Shats, Inna; Hong-Zohlman, Susie; Reoma, Junewai; Mazzeffi, Michael A; Rajagopal, Keshava
A 63-year-old male patient with HIV disease presented with dyspnea and complete heart block, and was found to have aortic valve (AV) endocarditis secondary to Candida parapsilosis infection. Echocardiography demonstrated AV endocarditis and possible aortic root versus subannular abscess with moderate AV regurgitation (AR), a ventricular septal defect (VSD) and possible left ventricular to right atrial shunt (Gerbode defect). Large AV vegetations, subannular abscess with an acquired membranous VSD, Gerbode defect, and tricuspid annular abscess at the insertion of septal leaflet were noted intraoperatively. The patient underwent AV replacement with a stented bioprosthesis, two-sided VSD patch closure, and tricuspid valve (TV) repair with an annuloplasty ring. The left-sided patch closed the VSD and facilitated AV replacement, while the right-sided patch facilitated the TV repair. PMID:26901898
Chiam, Paul Toon-Lim; Ewe, See Hooi; Chua, Yeow Leng; Lim, Yean Teng
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
Pomerantzeff Pablo Maria Alberto
Full Text Available A forty eight year old woman, who had undergone mitral comissurotomy and subsequently developed early restenosis, presented with major comissural fusion and verrucous lesions on the cuspid edges of the mitral valve, with normal subvalvar apparatus. Patient did well for the first six months after surgery when she began to present dyspnea on light exertion. A clinical diagnosis of restenosis was made, which was confirmed by an echocardiogram and cardiac catheterization. She underwent surgery, and a stenotic mitral valve with verrucous lesions suggesting Libman-Sacks' endocarditis was found. Because the diagnosis of systemic lupus erythematosus (SLE had not been confirmed at that time, a bovine pericardium bioprosthesis (FISICS-INCOR was implanted. The patient did well in the late follow-up and is now in NYHA Class I .
Furukawa, Hiroshi; Aono, Hitoshi; Samukawa, Masanobu; Ohkado, Akihiko
An 85-year-old woman had a history of coronary artery bypass grafting (CABG) performed 7 years ago, and dyspnea on effort had been worsening recently. Since echocardiography showed severe mitral valve regurgitation( MR), mitral valve repair was suggested. Preoperative enhanced computed tomography (CT) showed the patent functioning left internal thoracic artery (LITA) graft. Mitral valve replacement (MVR) using a 25 mm CEP bioprosthesis was performed successfully via resternotomy without any intraoperative injury of the heart. Myocardial protection without clamping of functioning LITA was done by both antegrade and retrograde continuous coronary perfusion (RCCP) under mild hypothermia. The postoperative clinical course was uneventful without any hemodynamic compromise. She was discharged on postoperative day 21 without any cardiac events following early introduction of cardiac rehabilitation. From these results, mitral valve reoperation by RCCP under mild hypothermia without control of functioning internal thoracic artery( ITA) grafts could be a safe option in some cases. PMID:22940664
François, J; Cathenis, K; Hamerlijnck, R
In case of a redo operation after a full root replacement there are two possible options: replacing the entire root or performing a more conservative valve-in-valve implantation. Regarding the relatively high morbidity and mortality of a redo root replacement, the valve-in-valve implantation is the preferred choice if technically feasible. We present the case of a valve-in-valve implantation with a St. Jude mechanical valve in a Medtronic bioprosthesis in a 57-year old man. Follow-up echocardiography after 1 month showed a mean gradient of 17 mmHg and no paravalvular leakage. The combination of a St. Jude bileaflet mechanical valve implanted in a Freestyle root prosthesis has not been described. This case shows that patient tailored treatment with a St. Jude bileaflet mechanical valve in a Freestyle aortic root valve can be safely performed and might be the preferred choice for younger patients, if technically feasible. PMID:26560005
Full Text Available Since 2000, transcatheter pulmonary valve replacement has steadily advanced. However, the available prosthetic valves are restricted to bioprosthesis which have defects like poor durability. Polymeric heart valve is thought as a promising alternative to bioprosthesis. In this study, we introduced a novel polymeric transcatheter pulmonary valve and evaluated its feasibility and safety in sheep by a hybrid approach.We designed a novel polymeric trileaflet transcatheter pulmonary valve with a balloon-expandable stent, and the valve leaflets were made of 0.1-mm expanded polytetrafluoroethylene (ePTFE coated with phosphorylcholine. We chose glutaraldehyde-treated bovine pericardium valves as control. Pulmonary valve stents were implanted in situ by a hybrid transapical approach in 10 healthy sheep (8 for polymeric valve and 2 for bovine pericardium valve, weighing an average of 22.5±2.0 kg. Angiography and cardiac catheter examination were performed after implantation to assess immediate valvular functionality. After 4-week follow-up, angiography, echocardiography, computed tomography, and cardiac catheter examination were used to assess early valvular function. One randomly selected sheep with polymeric valve was euthanized and the explanted valved stent was analyzed macroscopically and microscopically.Implantation was successful in 9 sheep. Angiography at implantation showed all 9 prosthetic valves demonstrated orthotopic position and normal functionality. All 9 sheep survived at 4-week follow-up. Four-week follow-up revealed no evidence of valve stent dislocation or deformation and normal valvular and cardiac functionality. The cardiac catheter examination showed the peak-peak transvalvular pressure gradient of the polymeric valves was 11.9±5.0 mmHg, while that of two bovine pericardium valves were 11 and 17 mmHg. Gross morphology demonstrated good opening and closure characteristics. No thrombus or calcification was seen macroscopically
Full Text Available The aim of the investigation is to assess the possibility of predicting the outcome of transcatheter aortic valve prosthesis implantation in real clinical practice on the basis of patient-specific modeling. Material and Methods. Modeling of transcatheter bioprosthesis implantation was carried out based on clinical data of a patient aged 72 years. Multispiral computed tomography (CT was performed before and after the operative intervention. Reconstruction of aorta and valvular apparatus geometry was done on the basis of obtained slices using computer-aided design (CAD. With the help of microcomputer tomography and a series of projection images and mathematical algorithms a 3D-model of the frame was reconstructed, on which a 3D-mesh from 17,000 cubic (C3D8-elements was built. Simulation of the system component interaction was conducted using a finite element method involving a number of successive steps: preliminary balloon dilatation — frame compression in the catheter — releasing the frame from the catheter. To evaluate the accuracy of modeling results compared to the CT data of the patient with the implanted bioprosthesis a proprietary algorithm was developed using MATLAB R2014a software (The MathWorks, USA. Arrays of points corresponding to the center of the supporting frame beams, obtained in 11 orthogonal sections, were used as input data. Results. Peculiarities of patient-specific approach to modeling the implantation of transcatheter CoreValve bioprothesis by means of the developed bioinformation algorithm has been analyzed. We managed to achieve a high convergence of simulation and CT data for the frame inflow area (the difference of the simulation results for the first three layers did not exceed 4%. Comparison of the results in terms of the annulus area has also demonstrated a high convergence: the identity amounted to more than 90% for the inflow and middle zones of the supporting frame. Conclusion. The highest level of detail
Pawlikowski, M; Pfitzner, R
Mineralization (calcification) of heart valves (mitral, aortic and aortic bioprosthesis) have been analyzed using; histology, x-ray diffraction, infrared spectroscopy, scanning microscopy, atomic absorption and electron microprobe. Obtained results showed the presence of two type of mineralization. First type is represented by grains composed of hydroxyapatite containing admixture of carbonates. This mineralization is seen macroscopically. Second type of mineralization is possible to determine only using chemical methods. It is represented by biological structures containing amount of Ca, P and other elements higher then normal heart valves. This second type of the mineralization conducts to the changes of physical features of the tissue. Both types of calcification develops because of the defects of atomic structure of biological components of heart valves (mainly collagen). These defects show the presence of free atomic bindings i.e. electric potential. Because of this, they are able to react with surrounding free joints, starting calcification. Defects of biological structures of heart valves are the results of infections, mechanical destruction of the valves etc. Calcification may be stopped on different stages of its development: or as secret calcification or may pass to the stage seen as apatite grains. PMID:1342999
Claudio Ribeiro da Cunha
Full Text Available Paciente do sexo masculino, de 66 anos, previamente hipertenso, com história de ortopneia, palpitações e dor precordial de início súbito, que teve o diagnóstico de avulsão espontânea de uma comissura valvar aórtica e consequente insuficiência aórtica aguda, evoluindo com insuficiência cardíaca esquerda refratária ao tratamento clínico. O paciente foi submetido precocemente à substituição cirúrgica da valva aórtica por uma bioprótese, e apresentou evolução pós-operatória satisfatória. Atualmente, quatro anos após o evento, continua em acompanhamento ambulatorial em classe funcional I.A 66-year-old male patient, prior hypertension, a history of orthopnea, palpitations and chest pain of sudden onset, which was diagnosed as spontaneous avulsion of aortic valve commissure and consequent aortic insufficiency progressing to acute left heart failure refractory to medical treatment. The patient underwent early surgical replacement of the aortic valve by a bioprosthesis, and presented satisfactory postoperative course. Currently, four years after the event, still in attendance in functional class I.
García Paez, J M; Carrera San Martín, A; Jorge-Herrero, E; Millán, I; Navidad, R; Candela, I; García Sestafe, J V; Castillo-Olivares, J L
Our study of the different biomaterials used in the construction of biological cardiac prostheses has shown it to be of vital importance that the physical properties of the tissue and of the suture that anchors it to the rigid polymeric support are compatible. By means of dynamic tests, we have determined the fatigue curve in sutured bovine pericardial tissue, expressed by the equation log y = 1.27 +/- 0.18 (0.26 +/- 0.05) log t, where y is the initial fatigue stress (MPa) and t is the time (min) it takes to achieve permanent deformation of the tissue. By applying this correction, we determine a set of values for stress-time which, when compared with those obtained with a non-sutured sample, reveal a significant fall in this ratio and, thus, a decrease in the durability. The use of suture threads of lesser elasticity than the pericardium may play an important role in reducing the durability of the bioprosthesis constructed with these materials. PMID:8199289
García Páez, J M; Carrera San Martin, A; García Sestafe, J V; Jorge Herrero, E; Navidad, R; Cordón, A; Castillo-Olivares, J L
The purpose of this study was to assess the elastic behaviour of calf pericardium used in the construction of cardiac bioprosthesis valve leaflets, sutured with different types of commercially available sutures: silk, Gore-Tex, Surgilene and nylon. Thirty-two samples (four series of eight samples each) were subjected to tensile strength testing to breakage. The breaking stress (MPa) ranged between 4.89 MPa for samples sutured with Gore-Tex and 5.22 MPa for those sewn with nylon. Three samples from each series were subjected to a stepwise stress test, involving increasing levels of stress followed by return to zero, to define the elastic limit (the cut-off point beyond which strain is no longer reversible). Analysis of the results provided the mathematical functions that govern the elastic behaviour (stress/strain) within the elastic range for each type of sutured sample. The series sutured with Surgilene presented the highest mean value (1.649 MPa). Finally, a statistical study was carried out to determine which series showed the greatest probability of having the least interaction between the thread and the pericardium. Allowing an interval of +/- 10%, Gore-Tex showed the best probability in this respect. However, real fatigue testing is necessary to definitively determine which is the best suture to use. PMID:8866029
Suchá, Dominika; Symersky, Petr; Tanis, W; Mali, Willem P Th M; Leiner, Tim; van Herwerden, Lex A; Budde, Ricardo P J
Echocardiography and fluoroscopy are the main techniques for prosthetic heart valve (PHV) evaluation, but because of specific limitations they may not identify the morphological substrate or the extent of PHV pathology. Cardiac computed tomography (CT) and magnetic resonance imaging (MRI) have emerged as new potential imaging modalities for valve prostheses. We present an overview of the possibilities and pitfalls of CT and MRI for PHV assessment based on a systematic literature review of all experimental and patient studies. For this, a comprehensive systematic search was performed in PubMed and Embase on March 24, 2015, containing CT/MRI and PHV synonyms. Our final selection yielded 82 articles on surgical valves. CT allowed adequate assessment of most modern PHVs and complemented echocardiography in detecting the obstruction cause (pannus or thrombus), bioprosthesis calcifications, and endocarditis extent (valve dehiscence and pseudoaneurysms). No clear advantage over echocardiography was found for the detection of vegetations or periprosthetic regurgitation. Whereas MRI metal artifacts may preclude direct prosthesis analysis, MRI provided information on PHV-related flow patterns and velocities. MRI demonstrated abnormal asymmetrical flow patterns in PHV obstruction and allowed prosthetic regurgitation assessment. Hence, CT shows great clinical relevance as a complementary imaging tool for the diagnostic work-up of patients with suspected PHV obstruction and endocarditis. MRI shows potential for functional PHV assessment although more studies are required to provide diagnostic reference values to allow discrimination of normal from pathological conditions. PMID:26353926
This study was conducted to determine the effect of sterilization using gamma radiation on the basic biomechanical properties of freeze dried bovine pericardium (FDBP). Bovine pericardium was obtained from the Shah Alam Abattoir, Selangor. The pericardial sacs were cleaned, freeze-dried and irradiated with 25 kGy gamma rays at Malaysian Institute of Nuclear Technology (MINT), Bangi, Selangor. The biomechanical properties of one hundred strips (1 cm by 4 cm) each of the irradiated and non-irradiated of FDBP were measured respectively by instron tensometer (Instron 4301) using 5 m/min cross 'head speed. The strips thickness was measured by Mitutoyo thickness gauge. The mean values of the tensile strength (12.4±0.522 MPa/mm2), load at auto break (1 8.5±1.08 N/mm2), modulus of elasticity (stiffness) (62.69±2.48 MPa/mm2) and elongation rate (5 1 %) for non-irradiated FDBP were found to be significantly higher (P2, 9.3±4.2 N/mm2, 35.7±1.7 MPa/mm2 and 43% respectively. However, the thickness between the two groups was not significantly different (P>0.05). Although sterilization using gamma irradiation is effective against disease transmission by bioprosthesis, it can caused significant decreased in FDBP tensile strength, load at auto break, Yang modulus and elongation rate. (Author)
Gulbins, Helmut; Reichenspurner, Hermann
This review article analyzes the literature to answer the question of whether stentless aortic bioprostheses possess proven advantages compared with stented bioprosthesis, and which patients might benefit from stentless valve implantation. For this purpose, the United States National Library of Medicine's PubMed and MEDLINE databases were searched for articles dealing with results of stentless aortic bioprostheses or studies comparing stented and stentless prostheses. Key word searches used were as follows: stentless aortic prostheses, stented aortic prosthesis, hemodynamic, hemodynamic performance, degeneration, durability, technique, and long-term follow-up. The analysis focused on stentless prostheses with a clinical experience for more than 5 years. Only a few randomized studies were found. Stentless prostheses were found to be advantageous in patients with severe impaired left ventricular function or a small aortic annulus (ie, evidence of grade II), but no specific advantages could be determined for the majority of patients. The durability results were mixed: the Toronto SPV (St. Jude Medical, Minneapolis, MN) showed an increase in degeneration after 10 years of follow-up, whereas the Freestyle porcine stentless prostheses (Medtronic, Minneapolis, MN) still showed excellent results after this period. PMID:19932303
Diego Felipe Gaia
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
Makkar, Raj R; Fontana, Gregory; Jilaihawi, Hasan;
BACKGROUND: A finding of reduced aortic-valve leaflet motion was noted on computed tomography (CT) in a patient who had a stroke after transcatheter aortic-valve replacement (TAVR) during an ongoing clinical trial. This finding raised a concern about possible subclinical leaflet thrombosis and pr...... further investigation. (Funded by St. Jude Medical and Cedars-Sinai Heart Institute; Portico-IDE ClinicalTrials.gov number, NCT02000115; SAVORY registry, NCT02426307; and RESOLVE registry, NCT02318342.).......BACKGROUND: A finding of reduced aortic-valve leaflet motion was noted on computed tomography (CT) in a patient who had a stroke after transcatheter aortic-valve replacement (TAVR) during an ongoing clinical trial. This finding raised a concern about possible subclinical leaflet thrombosis and...... prompted further investigation. METHODS: We analyzed data obtained from 55 patients in a clinical trial of TAVR and from two single-center registries that included 132 patients who were undergoing either TAVR or surgical aortic-valve bioprosthesis implantation. We obtained four-dimensional, volume...
Full Text Available Abstract Background Mitral valve replacement in the presence of severe annular calcification is a technical challenge. Case report A 47-year-old lady who had undergone mitral and aortic valve replacement for rheumatic disease 27 years before presented with dyspnea. At reoperation, extensive mitral annular calcification was hindering the disc motion of the Starr-Edwards mitral prosthesis. The old prosthesis was removed and a St Jude Medical mechanical valve was implanted after thorough annular debridement. Postoperatively the patient developed paravalvular leak and hemolytic anemia, subsequently undergoing reoperation three days later. The mitral valve was replaced with an Edwards MIRA valve, with a bulkier sewing cuff, after more aggressive annular debridement. Although initially there was no paravalvular leak, it recurred five days later. The patient also developed a small cerebral hemorrhage. As the paravalvular leak and hemolytic anemia gradually worsened, the patient underwent reoperation 14 days later. A Carpentier-Edwards bioprosthetic valve with equine pericardial patches, one to cover the debrided calcified annulus, another as a collar around the prosthesis, was used to eliminate paravalvular leak. At 7 years postoperatively the patient is doing well without any evidence of paravalvular leak or structural valve deterioration. Conclusion Mitral valve replacement using a bioprosthesis with equine pericardial patches was useful to overcome recurrent paravalvular leak due to severe mitral annular calcification.
Heraldo Guedis Lobo Filho
Full Text Available Apresentamos um caso de aneurisma infectado de artéria braquial em paciente com endocardite infecciosa por Streptococcus bovis. Homem de 49 anos de idade se apresentou com febre, dispnéia e sopro regurgitativo em foco mitral com irradiação para axila. O ecocardiograma demonstrou vegetação em valva mitral nativa. Após troca valvar mitral com implante de prótese biológica, observou-se massa pulsátil de cinco centímetros de diâmetro em fossa antecubital direita. Foi feito o diagnóstico de aneurisma infectado de artéria braquial, e o tratamento cirúrgico foi realizado com sucesso. O objetivo desse relato de caso é apresentar uma complicação pouco comum após endocardite infecciosa.We present a case of brachial artery infected aneurysm in a patient with infective endocarditis caused by Streptococcus bovis. A 49-year-old man presented with fever dyspnea and a pansystolic murmur with irradiation to axilla. The echocardiogram revealed vegetation in native mitral valve. After mitral valve replacement with bioprosthesis, it was observed pulsatile mass of five centimeters in diameter at antecubital fossa of right upper limb. It was made the diagnosis of infected aneurysm of the brachial artery, and the surgery was performed successfully. The aim of this case report is to show a rare complication after infective endocarditis.
Substituição valvar por valva aórtica homóloga montada em suporte e preservada pelo glutaraldeído: estudo multicêntrico Valvar replacement with a glutaraldehyde preserved stent-mounted homologous aortic valve: a multicenter study
prosthesis, most oi them defined as a "high-risk" due either to age less than 15 years old or due to calcification of a previous bioprosthesis. Ages varied from 5 to 66 years (median: 20 y/o; 62 patients (52.5% were children and 18 (15.3% had a calcified bioprosthesis. The procedures performed were 88 isolated mitral valve replacement, 9 mitral and aortic replacement, 8 isolated aortic valve and 2 isolated tricuspid substitution. Hospital mortality was 2.5% (3/118; post-operative follow-up consisted of 2614 months/patient with complete and detailed direct follow-up obtained in 91% of survivors, Survival was 94.9%. at 36 months with only 3 deaths in the 115 patients who were discharged from hospital. In our experience and in the literature these results are superior to those with other biological prosthesis: it seems likely that this prosthesis will be highly recommended, specially for children, jf these results are maintained in longer periods.
Kiessling Arndt H
Full Text Available Abstract Background We assessed the hemodynamic performance of various prostheses and the clinical outcomes after aortic valve replacement, in different age groups. Methods One-hundred-and-twenty patients with isolated aortic valve stenosis were included in this prospective randomized randomised trial and allocated in three age-groups to receive either pulmonary autograft (PA, n = 20 or mechanical prosthesis (MP, Edwards Mira n = 20 in group 1 (age 75. Clinical outcomes and hemodynamic performance were evaluated at discharge, six months and one year. Results In group 1, patients with PA had significantly lower mean gradients than the MP (2.6 vs. 10.9 mmHg, p = 0.0005 with comparable left ventricular mass regression (LVMR. Morbidity included 1 stroke in the PA population and 1 gastrointestinal bleeding in the MP subgroup. In group 2, mean gradients did not differ significantly between both populations (7.0 vs. 8.9 mmHg, p = 0.81. The rate of LVMR and EF were comparable at 12 months; each group with one mortality. Morbidity included 1 stroke and 1 gastrointestinal bleeding in the stentless and 3 bleeding complications in the MP group. In group 3, mean gradients did not differ significantly (7.8 vs 6.5 mmHg, p = 0.06. Postoperative EF and LVMR were comparable. There were 3 deaths in the stented group and no mortality in the stentless group. Morbidity included 1 endocarditis and 1 stroke in the stentless compared to 1 endocarditis, 1 stroke and one pulmonary embolism in the stented group. Conclusions Clinical outcomes justify valve replacement with either valve substitute in the respective age groups. The PA hemodynamically outperformed the MPs. Stentless valves however, did not demonstrate significantly superior hemodynamics or outcomes in comparison to stented bioprosthesis or MPs.
Full Text Available Abstract Objective The present study was undertaken to examine the incidence and management of surgical site infection (SSI in patients submitted to transapical transcatheter aortic valve implantation (TA-TAVI. Methods From April 2007 to December 2011, 154 patients underwent TA-TAVI with an Edwards Sapien bioprosthesis (ES at the Institut Universitaire de Cardiologie et Pneumologie de Québec (IUCPQ as part of a multidisciplinary program to prospectively evaluate percutaneous aortic valve implantation. Patient demographics, perioperative variables, and postoperative complications were recorded in a prospective registry. Results Five (3.2% patients in the cohort presented with an SSI during the study period. The infections were all hospital-acquired (HAI and were considered as organ/space SSI’s based on Center for Disease Control criteria (CDC. Within the first few weeks of the initial procedure, these patients presented with an abscess or chronic draining sinus in the left thoracotomy incision and were re-operated. The infection spread to the apex of the left ventricle in all cases where pledgeted mattress sutures could be seen during debridement. Patients received multiple antibiotic regimens without success until the wound was surgically debrided and covered with viable tissue. The greater omentum was used in three patients and the pectoralis major muscle in the other two. None of the patients died or had a recurrent infection. Three of the patients were infected with Staphylococcus epidermidis, one with Staphylococcus aureus, and one with Enterobacter cloacae. Patients with surgical site infections were significantly more obese with higher BMI (31.4±3.1 vs 26.2±4.4 p=0.0099 than the other patients in the cohort. Conclusions While TA-TAVI is a minimally invasive technique, SSIs, which are associated with obesity, remain a concern. Debridement and rib resection followed by wound coverage with the greater omentum and/or the pectoralis major
Kurzynski, Marek; Krysmann, Maciej; Trajdos, Pawel; Wolczowski, Andrzej
In this paper the problem of recognition of the intended hand movements for the control of bio-prosthetic hand is addressed. The proposed method is based on recognition of electromiographic (EMG) and mechanomiographic (MMG) biosignals using a multiclassifier system (MCS) working in a two-level structure with a dynamic ensemble selection (DES) scheme and original concepts of competence function. Additionally, feedback information coming from bioprosthesis sensors on the correct/incorrect classification is applied to the adjustment of the combining mechanism during MCS operation through adaptive tuning competences of base classifiers depending on their decisions. Three MCS systems operating in decision tree structure and with different tuning algorithms are developed. In the MCS1 system, competence is uniformly allocated to each class belonging to the group indicated by the feedback signal. In the MCS2 system, the modification of competence depends on the node of decision tree at which a correct/incorrect classification is made. In the MCS3 system, the randomized model of classifier and the concept of cross-competence are used in the tuning procedure. Experimental investigations on the real data and computer-simulated procedure of generating feedback signals are performed. In these investigations classification accuracy of the MCS systems developed is compared and furthermore, the MCS systems are evaluated with respect to the effectiveness of the procedure of tuning competence. The results obtained indicate that modification of competence of base classifiers during the working phase essentially improves performance of the MCS system and that this improvement depends on the MCS system and tuning method used. PMID:25982067
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
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
Full Text Available Olaf Stanger, Hendrik Tevaearai, Thierry Carrel Clinic for Cardiovascular Surgery, University Hospital Berne, Switzerland Abstract: The third-generation bovine pericardium Freedom SOLO (FS stentless valve emerged in 2004 as a modified version of the Pericarbon Freedom stentless valve and as a very attractive alternative to stented bioprostheses. The design, choice of tissue, and anticalcification treatment fulfill most, if not all, requirements for an ideal valve substitute. The FS combines the single-suture, subcoronary implantation technique with the latest-generation bovine pericardial tissue and novel anticalcification treatment. The design allows imitation of the native healthy valve through unrestricted adaption to the patient's anatomy, reproducing a normal valve/root complex. However, despite hemodynamic performance superior to stented valves, we are approaching a critical observation period as superior durability, freedom from structural valve deterioration, and nonstructural failure has not been proven as expected. However, optimal performance and freedom from structural valve deterioration depend on correct sizing and perfect symmetric implantation, to ensure low leaflet stress. Any malpositioning can lead to tissue fatigue over time. Furthermore, the potential for better outcomes depends on optimal patient selection and observance of the limitations for the use of stentless valves, particularly for the FS. Clearly, stentless valve implantation techniques are less reproducible and standardized, and require surgeon-dependent experience and skill. Regardless of whether or not stentless valve durability surpasses third-generation stented bioprostheses, they will continue to play a role in the surgical repertoire. This review intends to help practitioners avoid pitfalls, observe limitations, and improve patient selection for optimal long-term outcome with the attractive FS stentless valve. Keywords: aortic valve, bioprosthesis, cardiac
Barbanti, Marco; Schiltgen, Molly; Verdoliva, Sarah; Bosmans, Johan; Bleiziffer, Sabine; Gerckens, Ulrich; Wenaweser, Peter; Brecker, Stephen; Gulino, Simona; Tamburino, Corrado; Linke, Axel
This study compared 3-year clinical outcomes of patients who underwent transcatheter aortic valve implantation with the Society of Thoracic Surgeons (STS) score ≤7% to those of patients with a score >7%. Data were drawn from the ADVANCE study, a multinational post-market clinical trial that enrolled real-world patients with severe aortic stenosis treated with the CoreValve bioprosthesis. Events were independently adjudicated using Valve Academic Research Consortium-1 definitions. A total of 996 patients were implanted: STS ≤7% (n = 697, median STS 4.3%, interquartile range 3.1% to 5.4%) and STS >7% (n = 298, median STS 9.7%, interquartile range 8.0% to 12.4%). At 3 years, the STS ≤7% group had lower rates of all-cause mortality (28.6 vs 45.9, p 7% group. No differences were observed in cerebrovascular accidents, vascular complications, bleeding, or myocardial infarction. In patients with STS ≤7%, mortality at 3 years was higher in those with moderate or severe aortic regurgitation (AR) at discharge than in those with mild or less AR (39.9% vs 22.9%; hazard ratio 1.98; 95% confidence interval 1.37 to 2.86; p 7% (42.9% vs 44.6%, moderate/severe vs mild/less; hazard ratio 1.04; 95% confidence interval, 0.62 to 1.75; p = 0.861; p for interaction = 0.047). In conclusion, patients with STS ≤7% had lower rates of all-cause and cardiovascular mortality at 3 years after transcatheter aortic valve implantation. Complication rates were low and stable in both groups, demonstrating the safety of this procedure for patients at various levels of surgical risk. PMID:26762727
Full Text Available Abstract Background Real-time cardiovascular magnetic resonance (rtCMR is considered attractive for guiding TAVI. Owing to an unlimited scan plane orientation and an unsurpassed soft-tissue contrast with simultaneous device visualization, rtCMR is presumed to allow safe device navigation and to offer optimal orientation for precise axial positioning. We sought to evaluate the preclinical feasibility of rtCMR-guided transarterial aortic valve implatation (TAVI using the nitinol-based Medtronic CoreValve bioprosthesis. Methods rtCMR-guided transfemoral (n = 2 and transsubclavian (n = 6 TAVI was performed in 8 swine using the original CoreValve prosthesis and a modified, CMR-compatible delivery catheter without ferromagnetic components. Results rtCMR using TrueFISP sequences provided reliable imaging guidance during TAVI, which was successful in 6 swine. One transfemoral attempt failed due to unsuccessful aortic arch passage and one pericardial tamponade with subsequent death occurred as a result of ventricular perforation by the device tip due to an operating error, this complication being detected without delay by rtCMR. rtCMR allowed for a detailed, simultaneous visualization of the delivery system with the mounted stent-valve and the surrounding anatomy, resulting in improved visualization during navigation through the vasculature, passage of the aortic valve, and during placement and deployment of the stent-valve. Post-interventional success could be confirmed using ECG-triggered time-resolved cine-TrueFISP and flow-sensitive phase-contrast sequences. Intended valve position was confirmed by ex-vivo histology. Conclusions Our study shows that rtCMR-guided TAVI using the commercial CoreValve prosthesis in conjunction with a modified delivery system is feasible in swine, allowing improved procedural guidance including immediate detection of complications and direct functional assessment with reduction of radiation and omission of contrast media.
Diego Felipe Gaia
procedimento alternativo.OBJECTIVE: The aortic valve replacement is a routine procedure with acceptable risk, but in some cases, such a risk can justify contraindication. The minimally invasive transcatheter aortic valve implantation has been viable, with lower morbidity and mortality. The aim of this study was to develop a national catheter-mounted aortic bioprosthesis for the aortic position implant. METHODS: After animal studies, 14 patients with high EuroSCORE underwent transcatheter aortic valve implantation. Median Logistic EuroSCORE was 43.7%. Four patients presented with dysfunctional bioprosthesis, remaining ones presented calcified aortic stenosis. All patients presented symptoms. Procedures were performed in a hybrid OR under fluoroscopic and echocardiography guidance. Using a left minithoracotomy the prosthesis was implanted through the ventricular apex under ventricular pacing or hemorrhagic shock, after aortic valvoplasty. Echocardiograph and angiograph controls were performed, and the patients were referred to ICU. RESULTS: Implant was feasible in 13 cases. There were no intra-operative deaths. Median peak transvalvular aortic gradient reduced to 25.0 mmHg, and left ventricular function improved in the first seven post-operative days. Paravalvular aortic regurgitation was mild and present in 71%. No definitive pacemaker was needed. There was no peripheral vascular complication. Overall mortality was 42%. CONCLUSION: The transapical implantation of cathetermounted bioprosthesis was a feasible procedure. Long term follow-up is mandatory in order to access efficacy and indications.
Full Text Available OBJECTIVES: The aim of the work was to find biomarkers identifying patients at high risk of adverse clinical outcomes after TAVI and SAVR in addition to currently used predictive model (EuroSCORE. BACKGROUND: There is limited data about the role of biomarkers in predicting prognosis, especially when TAVI is available. METHODS: The multi-biomarker sub-study included 42 consecutive high-risk patients (average age 82.0 years; logistic EuroSCORE 21.0% allocated to TAVI transfemoral and transapical using the Edwards-Sapien valve (n = 29, or SAVR with the Edwards Perimount bioprosthesis (n = 13. Standardized endpoints were prospectively followed during the 12-month follow-up. RESULTS: The clinical outcomes after both TAVI and SAVR were comparable. Malondialdehyde served as the best predictor of a combined endpoint at 1 year with AUC (ROC analysis = 0.872 for TAVI group, resp. 0.765 (p<0.05 for both TAVI and SAVR groups. Increased levels of MDA, matrix metalloproteinase 2, tissue inhibitor of metalloproteinase (TIMP1, ferritin-reducing ability of plasma, homocysteine, cysteine and 8-hydroxy-2-deoxyguanosine were all predictors of the occurrence of combined safety endpoints at 30 days (AUC 0.750-0.948; p<0.05 for all. The addition of MDA to a currently used clinical model (EuroSCORE significantly improved prediction of a combined safety endpoint at 30 days and a combined endpoint (0-365 days by the net reclassification improvement (NRI and the integrated discrimination improvement (IDI (p<0.05. Cystatin C, glutathione, cysteinylglycine, asymmetric dimethylarginine, nitrite/nitrate and MMP9 did not prove to be significant. Total of 14.3% died during 1-year follow-up. CONCLUSION: We identified malondialdehyde, a marker of oxidative stress, as the most promising predictor of adverse outcomes during the 30-day and 1-year follow-up in high-risk patients with symptomatic, severe aortic stenosis treated with TAVI. The development of a clinical
Implante transcateter de valva aórtica: resultados atuais do desenvolvimento e implante de um nova prótese brasileira Transcatheter aortic valve implantation: results of the current development and implantation of a new Brazilian prosthesis
Diego Felipe Gaia
. Minimally invasive transcatheter aortic valve implantation has emerged as an alternative, with lower morbidity and mortality. The aim of this study was clinical, safety and efficacy assessment. METHODS: Thirty-three high risk patients underwent transcatheter balloon expandable aortic valve implantation. Mean Logistic EuroScore risk was 39.30% and STS score 30.28%. Eight patients presented with dysfunctional bioprosthesis, remaining ones presented calcified aortic stenosis. Procedures were performed in a hybrid OR under fluoroscopic and echocardiography guidance. Using a left minithoracotomy the prosthesis were implanted trough the ventricular apex under rapid ventricular pacing or hemorrhagic shock. Echocardiographic and angiographic controls were performed. RESULTS: Implant was feasible in 30 cases. Three conversions occured. There was only one case of operative death. Median transvalvular aortic gradient reduced from 43.58 mmHg to 10.54 mmHg. Left ventricular function improved in the first 7 postoperative days. Paravalvular aortic regurgitation was mild and present in 30.30%. One case presented major vascular complication and another one permanent pacemaker implant. One major stroke case occurred. Overall 30-day mortality was 18.18%. CONCLUSION: The transapical implantation of catheter mounted bioprosthesis is a safe procedure with acceptable midterm results. Long term follow-up with increased sample power is mandatory in order to access hemodynamic, life quality and survival
Comparação entre o pericárdio bovino decelularizado e o pericárdio bovino convencional utilizado na confecção de biopróteses valvares cardíacas Comparison between the decellularized bovine pericardium and the conventional bovine pericardium used in the manufacture of cardiac bioprostheses
Jean Newton Lima Costa
ísica do pericárdio, além de não induzir resposta inflamatória diferente daquela habitualmente encontrada no pericárdio convencional.INTRODUCTION: In this paper, our objective was to compare the decellularized and conventional pericardium mechanical resistance and also its capability of inducing inflammatory response in an animal experimental model. METHOD: In order to study these properties, we divided the pericardia into two groups: Group I - pericardium conventionally treated with GTA - and Group II - pericardium previously decellularized and then treated with GTA in the conventional way. After the chemical treatment, Group II samples were histologically evaluated to confirm the efficacy of the decellularization process. Then, only for the analysis of mechanical resistance, pericardia were divided in: Groups 1 (conventional pericardia with criteria of approval, 2 (conventional pericardial with criteria of disapproval and 3 (decellularized pericardia. The capacity of inducing inflammatory response was tested in a rat experimental model with 50 Wistar rats, in which rats of each group received patches of the pericardia in the abdomen. Our third step of analysis was manufacturing three decellularized pericardium bioprosthesis which were submitted to hydrodynamic evaluation together with a conventional bioprosthesis test. RESULTS: The histological analysis showed complete decellularization. Mechanical resistance gave statistical differences in the "tension of rupture" and "tenacity index" tests. We found no difference in the inflammatory activity in the animal model. Hydrodynamic performance was similar and all prostheses reached 150 million cycles. The final histological analysis assessed the standard microscopic pattern, and no rupture or abnormal fragmentation caused by mechanical stress. CONCLUSION: The decellularization technique maintains the physical resistance of the pericardium when compared with the conventionally prepared pericardium. And also, there was no
杨岷; 束余声; 石维平; 樊纪丹; 尤庆生; Otto E.Dapunt
目的 报道应用无支架全主动脉根部生物瓣膜进行全主动脉根部置换术(Bio-Bentall手术)的早、中期临床效果.方法 回顾2001年11月到2009年3月病例,317例接受Bio-Bentall手术,男196例,女121例；年龄17 ～ 94岁,平均(70.3±10.2)岁,大于75岁的患者97例.均应用MedtronicFreestyle无支架全主动脉根部生物瓣膜进行全主动脉根部置换.203例患者仅行全主动脉根部置换或者主动脉根部置换加升主动脉置换(ARR),114例同期行其他手术(ARR+),其中冠状动脉旁路移植术82例,主动脉弓置换术36例,二尖瓣成形术11例.结果 ARR手术(190±57) min,主动脉阻断( 88±27) min.ARR+手术(282±93) min,主动脉阻断(110 -32) min.手术死亡25例,占7.9％.ARR者死亡11例,占5.4％；住ICU(4.9 ±8.1)天,住院(9.8±8.1)天.ARR组3例紧急行冠状动脉旁路移植手术.术后超声心动图显示跨瓣膜压力阶差低,尤其行间断单纯缝合(非褥式缝合)者压差更小.结论 Bio-Bentall手术保留了猪主动脉根部的完整性,不增加围术期和远期病死率,尤其适合小主动脉根部的老年主动脉瓣膜患者.%Objective The stentless full root aortic bioprosthesis has superior hemodynamics.Clinical data of Bio-Bentall procedure using stentless full root bioprosthesis of our center was retrospectively analyzed in this perspective for validation.Methods From November 2001 to March 2009,317 adult patients ( 196 male and 121 female) underwent modified Bio-Bentall procedure using the Medtronic Freestyle xenograft as a full root replacement.Two hundred and three patients received an isolated root replacement or a root and ascending aortic replacement (ARR).In 114 patients a variety of concomitant procedures including coronary artery bypass grafting ( n =32 ),mitral valve repair ( n =11 ) and aortic arch replacement ( n =36 ) were performed.(ARR + ).Results Mean patient age was (70.3 ± 10.2) years (range 17 -94 years),97 patients were 75 and
Domingo M Braile
indications to operating on valve lesions consist in symptom relief in preservation of complications and in mortality. Also in the first part, there is description of the surgical indication publication aspects pointing out stenosis and insufficiency of mitral, aortic, tricuspid and pulmonary valves, active inffectious endocarditis and pre-operative procedure in addition to the characterization of different mechanical and biological cardiac valve bioprostheses that exist in the market and their most frequent complications. The surgical treatment in valvopathies, operative techniques to replace mitral, aortic tricuspid and pulmonary valves, anesthetic and post-operative procedure as well as reoperations were covered in the second part of the publication. The abstract was concluded considering particular situations such as surgical treatment in endocarditis in mitral, tricuspid and aortic valves whose tendency is greater than it is in mitral and the most common cause of acute aortic failure as well. The endocarditis development has a different physiopathology when compared to prostheses and native valves, with greater morbi-mortality than that observed in native valves. There are a few endocarditis increasing risk factors in native valves, black race, mechanical prostheses, male sex and long extracorporeal circulation time. The clinical-surgical interaction seems to influence decisively in order to obtain better results in this pathology. Finally our experience has been reported with biological prostheses in mitral and aortic positions in 11 and 10 years of follow-up, respectively. The survival index in mitral replacements was similar amongst youngsters and adults 74% mitral and 67% aortic. Late fatal bioprosthesis related complications in mitral position were rupture, endocarditis, paravalvular leakage, thromboembolism and especially calcification at a rate of 1.0 event % patient-year 95% of the patients free from those complications. In the aortic position, thrombombolism and
Fábio Papa Taniguchi
Full Text Available OBJETIVO: Para melhorar as propriedades mecânicas e imunogênicas, o glutaraldeído é utilizado no tratamento do pericárdio bovino que é utilizado em biopróteses. A liofilização do pericárdio bovino tratado com glutaraldeído diminui os radicais aldeído, com provável redução do potencial para calcificação. O objetivo deste estudo é avaliar os efeitos da liofilização em biopróteses valvares de pericárdio bovino como mecanismo protetor na diminuição da disfunção estrutural valvar. MÉTODOS: Foi realizado o implante de biopróteses de pericárdio bovino tratado com glutaraldeído, liofilizadas ou não, em carneiros de 6 meses de idade, sendo os animais eutanasiados com 3 meses de seguimento. As biopróteses foram implantadas em posição pulmonar, com auxílio de circulação extracorpórea. Um grupo controle e outro grupo liofilizado foram avaliados quanto ao gradiente ventrículo direito/artéria pulmonar (VD/AP no implante e explante; análise quantitativa de cálcio; inflamação; trombose e pannus. O nível de significância estabelecido foi de 5%. RESULTADOS: O gradiente médio VD/AP, no grupo controle, no implante, foi 2,04 ± 1,56 mmHg e, no grupo de liofilização, foi 6,61 ± 4,03 mmHg. No explante, esse gradiente aumentou para 7,71 ± 3,92 mmHg e 8,24 ± 6,2 mmHg, respectivamente, nos grupos controle e liofilização. O teor de cálcio médio, após 3 meses, nas biopróteses do grupo controle foi 21,6 ± 39,12 µg Ca+2/mg de peso seco, em comparação com um teor médio de 41,19 ± 46,85 µg Ca+2/mg de peso seco no grupo liofilizado (P = 0,662. CONCLUSÃO: A liofilização de próteses valvares com pericárdio bovino tratado com glutaraldeído não demonstrou diminuição da calcificação neste experimento.OBJECTIVE: Glutaraldehyde is currently used in bovine pericardium bioprosthesis to improve mechanical and immunogenic properties. Lyophilization is a process that may decrease aldehyde residues in the
Paulo M Pêgo-Fernandes
bioprosthesis were reoperated on due to dysfunction. One patient submitted to aortoplasdty and an aortic valve plastic procedure presenting redissection and aortic insufficiency after 60 months, was reoperated on using the Bentall technique. In the actuarial curve analysis, patients submitted to valvuloplasty procedures had longer survival rates than the valve replacement patients. It is possible to conclude that: 1 valvular resuspension is a satisfactory technique in patients with chronic dissection of the aorta, with low mortality and less complications than valvular replacement; 2 identification of the mechanism producing the valvular insufficiency is fundamental for the choice of the surgical procedure; 3 the use of biological adhesives render easy the handling of the aorta and lessen the intraoperative bleeding; 4 when valvular replacement is indicated, mechanical prostheses are preferred, since reoperations are more difficult in these patients; 5 aortoplasties are avoided due to the high incidence of aortic redissection.
Trombose de prótese biológica mitral: importância do ecocardiograma transesofágico no diagnóstico e acompanhamento pós-tratamento Bioprosthetic mitral valve thrombosis: importance of transesophageal echocardiography in the diagnosis and follow-up after treatment
Adelino Parro Jr
TEE and clinical evolution. The morphologic features of the prosthetic leaflets, as well as the presence and characteristics of attached echogenic masses were investigated. The mean gradient through the prosthesis and the valvular area were obtained. RESULTS: The diagnosis of bioprosthetic mitral valve thrombosis was established 48.7±55.2 months after surgery. Two patients had ischemic stroke in the early postoperative period. The mean overall gradient was high (11.4±3 mmHg and the valvular area reduced (1.24±0.3 cm². On TEE, echogenic masses on the left ventricular face of the mitral bioprosthesis suggestive of thrombus were evidenced in all patients. On serial TEE (136±233 days, in 2 patients the thrombus had disappeared and in 2 others it was smaller after treatment, the mean gradient dropped to 6.2±3 mmHg (P = 0.004; 95% CI, and the valvular area increased to 2.07±0.4 (P = NS. CONCLUSION: TEE proved to be useful for detecting bioprosthetic mitral valve thrombosis and was effective in monitoring the treatment in all patients.
Estudo comparativo da eficácia do etanol e do ácido L-glutâmico na prevenção da calcificação das cúspides e parede aórtica porcina: estudo experimental em ratos Comparative study on the efficacy of ethanol and of l-glutamic acid for preventing calcification of pig cusps and aortic wall: experimental study in rats
George Ronald Soncini da ROSA
álcio/ mg tecido, E80% 30 dias (9,47 ± 2,59mg cálcio/mg tecido e E80% 60 dias (23,56±7,75 mg cálcio/mg tecido no grupo de AG 0,8% 15 dias (4,31±0,85 mg cálcio/mg tecido, AG 0,8% 30 dias (7,69±1,48 mg cálcio/mg tecido e AG 0,8% 60 dias (20,50± 1,22 mg cálcio/mg tecido com o grupo controle GDA 15 dias (7,34±1,32 mg cálcio/mg tecido, GDA 30 dias (9,28±0,76 mg cálcio/mg tecido e GDA 60 dias (27,60±1,08 mg cálcio/mg tecido. Na avaliação microscópica da cúspide aórtica houve uma progressiva calcificação naquelas submetidas à fixação com GDA. Este processo foi parcialmente encontrado com o AG 0,8% e totalmente ausente com o E80%. Quanto à avaliação referente aos segmentos da parede aórtica, também evidenciou-se progressiva calcificação, não sendo inibida pelos tratamentos com AG 0,8% e E80%. CONCLUSÕES: O pré-tratamento com etanol a 80% inibiu a calcificação nas cúspides aórticas porcinas, entretanto, não teve a mesma eficácia na parede aórtica. Contudo, o ácido L-glutâmico a 0,8% demonstrou minimizar a calcificação na parede aórtica. Estudos devem ser feitos para evidenciar se a ação anticalcificante do etanol a 80% mantém-se nas biopróteses aórticas porcinas se estas forem implantadas no sistema circulatório.INTRODUCTION: The glutataldehyde (GDA treated pigs cusps are one of most employed tissues in bioprosthesis, but is late post-implant calcification is main cause of its failure. BACKGROUND: This study aims at comparing and analyzing two methods (ethanol 80% and l-glutamic acid 0.8% to prevent calcification in pig cusps and aortic wall implanted subcutaneously in rats, the cusps and aortic wall segments of the control were in glutaraldehyde (GDA, during a 15, 30 and 60 days period after the implant. MATERIAL AND METHODS: We used 45 young rats, distributed in 3 groups of 15 rats each, which in turn were subdivided in 3 subgroups of 5 rats each, in which we implanted one cusp and one aortic wall segment in 2 subcutaneous