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ABSTRACT Advances in treatment of structural heart disease have been disruptive to cardiovascular surgery, and there have been discussions about how to incorporate these technologies into the surgeons’ therapeutic arsenal. Transcatheter procedures, complex redo interventions, and endovascular aortic approaches are already practiced by cardiovascular surgeons in Brazil. The expansion of these techniques, coupled with recent changes in the country’s medical residency program in cardiovascular surgery, has led to an urgent need to acquire catheter-based skills. In this article, we discuss these aspects in the light of the reality of cardiovascular surgery training in Brazil. arsenal procedures interventions Brazil techniques countrys country s catheterbased catheter based skills article

https://doi.org/10.21470/1678-9741-2023-0207

Ring Fracture of Brazilian Aortic Valve Bioprostheses Using Non-Compliant High-Pressure Transcatheter Balloon, an Ex Vivo Test
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Mota, Andre Lupp

; Gaia, Diego Felipe

; Fonseca, José Honório Palma da

Brazilian Journal of Cardiovascular Surgery

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Jun 2022, Volume 37 Nº 3 Páginas 301 - 305

Resumo: En | Texto: En | PDF: En

ABSTRACT Introduction: Aortic valve bioprostheses ring fracture in valve-in-valve procedures has shown low complication rates and presents as an option in the treatment of patients at high risk for conventional surgery, avoiding high transvalvular gradients, which are associated with increased mortality. Some prostheses available in the market cannot be fractured. In an ex vivo test, the possibility of ring fracture of aortic valve bioprostheses produced in Brazil when submitted to radial force application using a high-pressure non-compliant balloon was evaluated. Methods: One unit of each aortic valve bioprosthesis model, sizes 19 and 21 mm, produced by Brazilian companies (Braile Biomédica, Cardioprótese, and Labcor), was used. In the experiment, a non-compliant high-pressure balloon (Atlas®-Gold), 1 mm larger than the external diameter of the prosthesis, was positioned inside the valve annulus and inflated gradually aiming to fracture the prosthesis. Fracture pressures and photographic and radiological images of the prostheses before and after test were recorded. Results: All prostheses were fractured. In the models with metal ring, the fracture pressures were between 23 and 25 atm. In the other prostheses, the rupture occurred between 10 and 13 atm. No deformations in the structure were observed, which could potentially damage the aortic root. Conclusion: All the Brazilian prostheses evaluated were fractured, although the presence of a metal ring in the prosthesis framework increases the pressure required for fracture. The information obtained helps in the planning of valve-in-valve procedures in patients with aortic valve bioprostheses.

https://doi.org/10.21470/1678-9741-2021-0272

Acute thoracic aorta dissection: unraveling the pathophysiology of a silent killer dissection
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Mendes, Rodrigo

; Nascimento, Cristian Rodrigues do

; Fonseca, José Honório de Almeida Palma da

; Tenório, Pedro Pereira

Revista da Associação Médica Brasileira

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Fev 2022, Volume 68 Nº 2 Páginas 268 - 272

Resumo: En | Texto: En | PDF: En

https://doi.org/10.1590/1806-9282.20210939

Mitral Valve-In-Valve: Defining the Indication Limits by in vitro Hydrodynamic Tests in a Brazilian Transcatheter Prosthesis
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Nova, Thiago Vila

; Cardoso, Caio

; Braz, Ademir

; Palma, Honório

; Gaia, Diego

Brazilian Journal of Cardiovascular Surgery

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Dez 2021, Volume 36 Nº 6 Páginas 752 - 759

Resumo: En | Texto: En | PDF: En

Abstract Introduction: Reoperations in cardiac surgery represent a clinical challenge, particularly because of the higher rate of perioperative morbidity and mortality. Mitral valve reoperation owing to bioprosthesis dysfunction, transcatheter treatment with a prosthesis implantation over the prosthesis has emerged as an alternative, especially for patients with a previous approach. In this study, we analyzed the hydrodynamic behavior of transcatheter prosthesis implantation in conventional mitral bioprostheses through hydrodynamic tests and produced a recommendation for the size of transcatheter valve most adequate for valve-in-valve procedure. Methods: Mitral bioprostheses were attached to a flow duplicator and different combinations of transcatheter prostheses were implanted inside. The equipment simulates the hydrodynamic behavior of the valves submitted in vitro and determines transvalvular pressures and flow parameters. Results: All tests could be performed. Better hydrodynamic performance occurred for transcatheter prostheses 1 mm smaller than bioprostheses, except for the 27-mm bioprostheses. Effective valve areas (cm²) and transvalvular gradients (mmHg) were, respectively: Bioprosthesis × Inovare: 27 × 28 mm: 1.65 and 5.95/29 × 28 mm and 31 × 30 mm: 2.15 and 3.6. Conclusion: The mitral valve-in-valve implantation proved to be feasible in vitro. The use of 27-mm bioprostheses should be judicious, with preference for a 26-mm transcatheter valve. In the 29 and 31-mm bioprostheses, the implantation was very satisfactory, with good effective valve areas and transvalvular gradients, with preference for smaller transcatheter valves.

https://doi.org/10.21470/1678-9741-2020-0477

Avaliações biomecânica e morfológica das alterações da parede aórtica relacionadas ao método de interrupção de fluxo em diferentes técnicas cirúrgicas
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Tenório, Pedro Pereira

; Mendes, Rodrigo

; Fonseca, José Honório de Almeida Palma da

; Jaldin, Rodrigo Gibin

Jornal Vascular Brasileiro

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2021, Volume 20 elocation e20200204

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

https://doi.org/10.1590/1677-5449.200204 1 downloads

Atualização das Diretrizes Brasileiras de Valvopatias – 2020
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Tarasoutchi, Flavio

; Montera, Marcelo Westerlund

; Ramos, Auristela Isabel de Oliveira

; Sampaio, Roney Orismar

; Rosa, Vitor Emer Egypto

; Accorsi, Tarso Augusto Duenhas

; Santis, Antonio de

; Fernandes, João Ricardo Cordeiro

; Pires, Lucas José Tachotti

; Spina, Guilherme S.

; Vieira, Marcelo Luiz Campos

; Lavitola, Paulo de Lara

; Ávila, Walkiria Samuel

; Paixão, Milena Ribeiro

; Bignoto, Tiago

; Togna, Dorival Júlio Della

; Mesquita, Evandro Tinoco

; Esteves, William Antônio de Magalhães

; Atik, Fernando

; Colafranceschi, Alexandre Siciliano

; Moises, Valdir Ambrósio

; Kiyose, Alberto Takeshi

; Pomerantzeff, Pablo M. A.

; Lemos, Pedro A.

; Brito Junior, Fabio Sandoli de

; Weksler, Clara

; Brandão, Carlos Manuel de Almeida

; Poffo, Robinson

; Simões, Ricardo

; Rassi, Salvador

; Leães, Paulo Ernesto

; Mourilhe-Rocha, Ricardo

; Pena, José Luiz Barros

; Jatene, Fabio Biscegli

; Barbosa, Márcia de Melo

; Abizaid, Alexandre

; Ribeiro, Henrique Barbosa

; Bacal, Fernando

; Rochitte, Carlos Eduardo

; Fonseca, José Honório de Almeida Palma da

; Ghorayeb, Samira Kaissar Nasr

; Lopes, Marcelo Antonio Cartaxo Queiroga

; Spina, Salvador Vicente

; Pignatelli, Ricardo H.

; Saraiva, José Francisco Kerr

Arquivos Brasileiros de Cardiologia

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Out 2020, Volume 115 Nº 4 Páginas 720 - 775

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

https://doi.org/10.36660/abc.20201047 17824 downloads

Hemodynamic and Imaging Assessment of Transcatheter Aortic Valve Replacement with the Inovare® Proseal using Multislice Computed Tomography
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Fiori, Apoana Gomes

; Simonato, Matheus

; Eyer, Alfredo

; Fonseca, José Honório Palma da

; Gaia, Diego Felipe

Brazilian Journal of Cardiovascular Surgery

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Abr 2020, Volume 35 Nº 2 Páginas 127 - 133

Resumo: En | Texto: En | PDF: En

Abstract Objective: To evaluate the hemodynamic performance (i.e., gradients and paravalvular leakage [PVL]) of the new and experimental Braile Inovare® Proseal. Additionally, we aimed to assess pre and postoperatively the aortic annulus and the transcatheter prosthesis using multislice computed tomography (MSCT). Methods: Patients were selected by a multidisciplinary heart team and referred for transcatheter aortic valve replacement (TAVR). MSCT was performed before and after surgery. Measurements of the aortic valve and prosthesis were conducted and correlated with the valve gradient and residual PVL. Results: Twenty-one patients were selected for the protocol. Patients had a mean age of 79 years and 38% of them were of female sex. The mean EuroSCORE II value was 12.5%±10.8. Mean gradient was reduced from 45.8±11.04 mmHg to 5.59±2.61 mmHg and there were no instances of PVL worse than mild. There were no cases of coronary obstruction or procedural death. Circularity was present in all prostheses evaluated. Circularity indexes for the prostheses were: inflow 0.05±0.03, middle third 0.04±0.02, and outflow 0.04±0.02 (P=0.08). The mean distance between the prosthesis and the left and right coronary ostia were 14.8 mm±3.3 and 17.3 mm±3, respectively. Oversizing was appropriate with a mean of 22.14%±6%. Conclusion: Braile Inovare® Proseal transcatheter device has demonstrated low gradients with low rates of PVL. Oversizing by annular measurements was adequate. MSCT was adequate to evaluate device sizing and has demonstrated preserved expansibility and circularity in the evaluated cases.

https://doi.org/10.21470/1678-9741-2019-0103 179 downloads

Thrombocytopenia After Transcatheter Valve-in-Valve Implantation: Prognostic Marker or Mere Finding?
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Souza, Renato C. de

; Paim, Leonardo

; Viotto, Guilherme

; Aprigio, Joaquim

; Araújo, Lucas L.

; Ribeiro, Henrique

; Sampaio, Roney O.

; Tarasoutchi, Flavio

; Pomerantzeff, Pablo M. A.

; Palma, José Honório

; Jatene, Fabio B.

Brazilian Journal of Cardiovascular Surgery

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Ago 2018, Volume 33 Nº 4 Páginas 362 - 370

Resumo: En | Texto: En | PDF: En

Abstract Objective: To analyze the behavior of platelets after transcatheter valve-in-valve implantation for the treatment of degenerated bioprosthesis and how they correlate with adverse events upon follow-up. Methods: Retrospective analysis of 28 patients who received a valve-in-valve implant, 5 in aortic, 18 in mitral and 5 in tricuspid positions. Data were compared with 74 patients submitted to conventional redo valvular replacements during the same period, and both groups' platelet curves were analyzed. Statistical analysis was conducted using the IBM SPSS Statistics(r) 20 for Windows. Results: All patients in the valve-in-valve group developed thrombocytopenia, 25% presenting mild (<150.000/µL), 54% moderate (<100.000/µL) and 21% severe (<50.000/µL) thrombocytopenia. The platelet nadir was on the 4th postoperative day for aortic ViV, 2nd for mitral and 3rd for tricuspid patients, with the majority of patients recovering regular platelet count. However, the aortic subgroup comparison between valve-in-valve and conventional surgery showed a statistically significant difference from the 7th day onwards, where valve-in-valve patients had more severe and longer lasting thrombocytopenia. This, however, did not translate into a higher postoperative risk. In our study population, postoperative thrombocytopenia did not correlate with greater occurrence of adverse outcomes and only normal preoperative platelet count could significantly predict a postoperative drop >50%. Conclusion: Although thrombocytopenia is an extremely common finding after valve-in-valve procedures, the degree of platelet count drop did not correlate with greater incidence of postoperative adverse outcomes in our study population.

https://doi.org/10.21470/1678-9741-2018-0078 823 downloads

Combined Mitral and Aortic Valvar Bioprosthesis Transcatheter Transapical Implant: First Description in Brazil
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Sampaio, Roney Orismar

; Paixão, Milena Ribeiro

; Miranda, Thais Taveira

; Veronese, Elinthon Tavares

; Palma, José Honório de Almeida

; Tarasoutchi, Flávio

Arquivos Brasileiros de Cardiologia

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Nov 2017, Volume 109 Nº 5 Páginas 491 - 494

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

https://doi.org/10.5935/abc.20170118 1633 downloads

10.

A New Experimental Device for Transapical Access of the Aortic and Mitral Valves as well as the Aorta in its Various Segments
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Paim, Leonardo

; Fonseca, José Honório Palma da

; Arruda Junior, Francismar Vidal de

; Gutierrez, Paulo Sampaio

; Moreira, Luiz Felipe Pinho

; Jatene, Fabio Biscegli

Brazilian Journal of Cardiovascular Surgery

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Jun 2017, Volume 32 Nº 3 Páginas 156 - 161

Resumo: En | Texto: En | PDF: En

Abstract Objective: To present the results of a new experimental device developed to facilitate the transapical access in endovascular treatment of structural heart diseases. It aims to reduce the risk of bleeding and complications in this type of access and demonstrate the device as a safe, fast and effective alternative. Methods: CorPoint is composed of three parts: introducer, base with coiled spring, and closing capsule. By rotating movements, the spring is introduced into the myocardium and progressively approaches the base to the surface of the heart. Guidewires and catheters are inserted through the hollow central part and, at the end of the procedure, the capsule is screwed over the base, therefore stopping any bleeding. Results: The device was implanted in 15 pigs, weighing 60 kg each, through an anterolateral thoracotomy, while catheters were introduced and guided by fluoroscopy. All animals had minimal bleeding; introducers with diameter up to 22 Fr were used and various catheters and guidewires were easily handled. After finishing the procedure, the closing capsule was attached and no bleeding was observed at the site. Conclusion: This new device has proved effective, fast and secure for the transapical access. This shows great potential for use, especially by ensuring an easier and direct access to the mitral and aortic valves; the shortest distance to be traveled by catheters; access to the ascending and descending aorta; decreased bleeding complications; decreased surgical time; and the possibility of allowing the technique to evolve and become totally percutaneous.

https://doi.org/10.21470/1678-9741-2017-0013 634 downloads

11.

Heyde's Syndrome and Transcatheter Aortic Valve Implantation
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Balbo, Conrado Pedroso

; Seabra, Luciana Paula

; Galoro, Victor Gualda

; Caputi, Guido

; Palma, José Honório

; Buffolo, Ênio

Arquivos Brasileiros de Cardiologia

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Abr 2017, Volume 108 Nº 4 Páginas 378 - 380

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

https://doi.org/10.5935/abc.20160193 2360 downloads

12.

Analysis of the Use of Extracorporeal Circulation on the In-Hospital Outcomes of Dialytic Patients Who Underwent Myocardial Revascularization Surgery
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Miranda, Matheus

; Branco, João Nelson Rodrigues

; Vargas, Guilherme Flora

; Hossne Jr., Nelson Americo

; Yoshimoto, Michele Costa

; Fonseca, José Honorio de Almeida Palma da

; Pestana, José Osmar Medina de Abreu

; Buffolo, Enio

Arquivos Brasileiros de Cardiologia

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Dez 2016, Volume 107 Nº 6 Páginas 518 - 522

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Resumo Fundamento: A revascularização cirúrgica do miocárdio é o melhor tratamento para o paciente dialítico com doença coronariana multiarterial. Contudo, o procedimento ainda apresenta elevada morbimortalidade. O uso da circulação extracorpórea (CEC) pode impactar de maneira negativa na evolução intra-hospitalar desses pacientes. Objetivos: Avaliar a diferença entre as técnicas com ou sem CEC na evolução intra-hospitalar de pacientes dialíticos submetidos a cirurgia de revascularização do miocárdio. Métodos: Estudo unicêntrico de 102 pacientes dialíticos consecutivos e não selecionados, submetidos à revascularização cirúrgica do miocárdio em um hospital terciário universitário no período de 2007 a 2014. Resultados: 63 pacientes foram operados com CEC e 39 sem o uso de CEC. Foi observada alta prevalência de fatores de risco cardiovascular em ambos grupos, porém sem diferença estatisticamente significante entre eles. O grupo "com CEC" apresentou maior número de coronárias revascularizadas (2,4 vs 1,7; p <0,0001), maior necessidade de hemocomponentes (77,7% vs 25,6%; p <0,0001) e apoio inotrópico (82,5% vs 35,8%; p <0,0001). Na evolução pós-operatória, o grupo "sem CEC" apresentou menor necessidade de drogas vasoativas (61,5% vs 82,5%; p = 0,0340), maior taxa de extubação em sala cirúrgica (58,9% vs 23,8%, p = 0,0006), menor tempo de ventilação mecânica (13,0 horas vs 36,3 horas, p = 0,0217), menor taxa de infecções (7,6% vs 28,5%; p = 0,0120) e menor tempo de internação em UTI (5,2 dias vs 8,1 dias; p = 0,0054) em comparação ao grupo "com CEC". Não houve diferença de mortalidade entre os grupos. Conclusão: O uso da CEC na revascularização do miocárdio em pacientes dialíticos resultou em maior morbidade no período perioperatório em comparação ao procedimento realizado sem CEC, contudo, sem diferença de mortalidade.

Abstract Background: Myocardial revascularization surgery is the best treatment for dyalitic patients with multivessel coronary disease. However, the procedure still has high morbidity and mortality. The use of extracorporeal circulation (ECC) can have a negative impact on the in-hospital outcomes of these patients. Objectives: To evaluate the differences between the techniques with ECC and without ECC during the in-hospital course of dialytic patients who underwent surgical myocardial revascularization. Methods: Unicentric study on 102 consecutive, unselected dialytic patients, who underwent myocardial revascularization surgery in a tertiary university hospital from 2007 to 2014. Results: Sixty-three patients underwent surgery with ECC and 39 without ECC. A high prevalence of cardiovascular risk factors was found in both groups, without statistically significant difference between them. The group "without ECC" had greater number of revascularizations (2.4 vs. 1.7; p <0.0001) and increased need for blood components (77.7% vs. 25.6%; p <0.0001) and inotropic support (82.5% vs 35.8%; p <0.0001). In the postoperative course, the group "without ECC" required less vasoactive drugs, (61.5% vs. 82.5%; p = 0.0340) and shorter time of mechanical ventilation (13.0 hours vs. 36,3 hours, p = 0.0217), had higher extubation rates in the operating room (58.9% vs. 23.8%, p = 0.0006), lower infection rates (7.6% vs. 28.5%; p = 0.0120), and shorter ICU stay (5.2 days vs. 8.1 days; p = 0.0054) as compared with the group with ECC surgery. No difference in mortality was found between the groups. Conclusion: Myocardial revascularization with ECC in patients on dialysis resulted in higher morbidity in the perioperative period in comparison with the procedure without ECC, with no difference in mortality though.

https://doi.org/10.5935/abc.20160180 2085 downloads

13.

Estudo da Fase Intra-hospitalar da Revascularizacao Cirurgica do Miocardio em Pacientes Dialiticos
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Miranda, Matheus

; Hossne Jr., Nelson Americo

; Branco, Joao Nelson Rodrigues

; Vargas, Guilherme Flora

; Fonseca, Jose Honorio de Almeida Palma da

; Pestana, Jose Osmar Medina de Abreu

; Juliano, Yara

; Buffolo, Enio

Arquivos Brasileiros de Cardiologia

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Mar 2014, Volume 102 Nº 2 Páginas 128 - 133

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Fundamentos: Atualmente, a revascularização cirúrgica do miocárdio é o melhor tratamento para o paciente dialítico com lesão coronariana multiarterial, contudo a mortalidade e a morbidade hospitalar do procedimento ainda permanecem altas. Objetivos: Avaliar os resultados e a evolução intra-hospitalar da revascularização cirúrgica do miocárdio isolada em pacientes dialíticos. Métodos: Estudo retrospectivo unicêntrico de 50 pacientes dialíticos consecutivos e não selecionados, submetidos à revascularização cirúrgica do miocárdio em um hospital terciário universitário no período de 2007 a 2012. Resultados: A casuística apresentou alta prevalência de fatores de risco cardiovasculares (100% hipertensos, 68% diabéticos e 40% dislipidêmicos). Não houve óbito intraoperatório, e 60% dos procedimentos foram feitos sem circulação extracorpórea. Houve sete (14%) óbitos intra-hospitalares. Infecção pós-operatória, insuficiência cardíaca prévia, uso de circulação extracorpórea, função ventricular anormal e reexploração cirúrgica foram os fatores associados a maior mortalidade. Conclusão: A revascularização cirúrgica do miocárdio é um procedimento factível para essa classe de pacientes, contudo com alta morbidade e mortalidade intra-hospitalar. É necessário melhor entendimento das particularidades metabólicas desses pacientes para o planejamento adequado das condutas.

Background: Coronary artery bypass grafting currently is the best treatment for dialytic patients with multivessel coronary disease, but hospital morbidity and mortality related to procedure is still high. Objective: Evaluate results and in-hospital outcomes of coronary artery bypass grafting in dialytic patients. Methods: Retrospective unicentric study including 50 consecutive and not selected dialytic patients, who underwent coronary artery bypass grafting in a tertiary university hospital from 2007 to 2012. Results: High prevalence of cardiovascular risk factors was observed (100% hypertensive, 68% diabetic and 40% dyslipidemic). There was no intra-operative death and 60% of the procedures were performed off-pump. There were seven (14%) in-hospital deaths. Postoperative infection, previous heart failure, cardiopulmonary bypass, abnormal ventricular function and surgical re-exploration were associated with increased mortality. Conclusion: Coronary artery bypass grafting is feasible to dialytic patients although high in-hospital morbidity and mortality. It is necessary better understanding about metabolic aspects to plan adequate interventions.

https://doi.org/10.5935/abc.20130231 3307 downloads

14.

Assistência ventricular com implante do dispositivo CentriMag VAS® para suporte mecânico biventricular
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Breda, João Roberto

; Gaia, Diego Felipe

; Macedo, Murilo

; Motta, Pedro

; Martins, Márcio

; Alves, Daniel

; Luppi, Andre

; Palma, José Honório

Brazilian Journal of Cardiovascular Surgery

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Set 2013, Volume 28 Nº 3 Páginas 401 - 404

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Apesar dos avanços no tratamento de portadores de insuficiência cardíaca aguda, os resultados permanecem insatisfatórios nos portadores de choque cardiogênico refratário. Uma opção para o tratamento dessa desafiadora e grave situação clínica é o implante de dispositivos de assistência ventricular temporária. O objetivo desta comunicação é apresentar um caso de choque cardiogênico refratário, com indicação de assistência ventricular, que evoluiu com falência ventricular direita após o implante de assistência esquerda com necessidade de conversão para o suporte biventricular.

Despite recent advances in acute heart failure treatment, actual results remain limited in refractory cardiogenic shock. Temporary ventricular assist devices have emerged as an alternative in this serious and challenging medical. The purpose of this communication is to present a case of refractory cardiogenic shock, underwent temporary left ventricular assistance device implantation, progressing to right ventricular failure and conversion to biventricular support.

https://doi.org/10.5935/1678-9741.20130061 10533 downloads

15.

Stent aórtico pulsátil: uma nova alternativa na assistência ventricular crônica
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Palma, José Honório

; Gaia, Diego Felipe

; Caputi, Guido

; Agreli, Guilherme

; Breda, João Roberto

; Braile, Domingo M.

; Buffolo, Enio

Brazilian Journal of Cardiovascular Surgery

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Jun 2013, Volume 28 Nº 2 Páginas 217 - 223

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

OBJETIVO: A insuficiência cardíaca é uma das causas mais comuns de internação. Dispositivos para assistência circulatória crônica foram testados e, em sua maioria, são de alta complexidade. O objetivo deste estudo é a descrição de uma endoprótese contrátil com capacidade de pulsação crônica no interior da aorta descendente, de maneira semelhante à produzida pelo balão intra-aórtico. MÉTODOS: Endopróteses pulsáteis compostas de níquel-titânio foram posicionadas de forma a envolver tubos de látex, simulando a aorta. Diferentes correntes elétricas foram aplicadas a unidades ligadas em série, de modo a causar contração da estrutura e deslocamento de uma coluna líquida. Foram realizadas duas sequências de testes: a primeira com duas gaiolas metálicas e a segunda com cinco gaiolas. Na primeira sequência de testes, aplicou-se tensão de 16,3 volts e corrente de 5 amperes e, na segunda sequência, tensão de 15 volts e corrente de 7 amperes. RESULTADOS: Na primeira sequência de testes, obteve-se o efeito pulsátil dos 2 stents, havendo contração do tubo e deslocamento da coluna d'água suficientes para validar o efeito pulsátil da endoprótese. As duas estruturas ejetaram um volume de 2,6 mL por ciclo, com uma variação de 29 mm na altura da coluna de água, equivalente a 8% de contração durante a pulsação. Na segunda sequência, conseguiu-se uma variação de 7,4 mL por ciclo. CONCLUSÃO: Os resultados obtidos comprovam a contratilidade da endoprótese pulsátil ativada pela aplicação de corrente elétrica. Continuidade do estudo e aperfeiçoamento do material se fazem necessários para obtenção de modelo mais eficiente do ponto de vista energético e com maior pulsação, para permitir volumes de ejeção comparáveis aos de balões intra-aórticos.

OBJECTIVE: Heart failure is currently one of the most common hospitalization causes. Several chronic circulatory assist devices have been tested and are highly complex. The objective is the description of a pulsatile endoprosthesis capable of applying a chronic pulse within the descending aorta, similar to that produced by intra-aortic balloon. METHODS: Pulsatile stents composed of nickel-titanium were built and positioned to engage latex tubes simulating the aorta. Different electric currents were applied to units connected in series in order to cause structure contraction and displacement of a liquid column. There were two sequence tests: first composed of two metallic cages and the second composed of five cages. At first sequence tests was applied a voltage of 16.3 volts and a current of 5 amperes. In the second, voltage of 15 volts and current of 07 amperes. RESULTS: In the first sequence was obtained the pulsatile effect of stent, with contraction of the tube and displacement of the water column sufficient to validate the pulsating effect of the endoprosthesis. The two structures ejected a volume of 2.6 ml per cycle, with a range of 29 mm in height of the column of water equivalent to 8% shrinkage during the pulse. In the second sequence, it reachead a variation of 7.4 mL per cycle. CONCLUSION: The results obtained confirm the stent pulsatile contractility activated by electrical current. The continuity of the study and material improvement are necessary to obtain more efficient model from the point of view of energy and pulse, to allow ejection volumes comparable with the intra-aortic balloons

https://doi.org/10.5935/1678-9741.20130031 2920 downloads

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