Obstruction of the left ventricle outlet by mitral valve prosthesis: report of six cases

rbccv Brazilian Journal of Cardiovascular Surgery Braz. J. Cardiovasc. Surg. 0102-7638 1678-9741 Sociedade Brasileira de Cirurgia Cardiovascular São Paulo, SP, Brazil From January/1982 to March/1984, 170 high profile bovine pericardium bioprostheses were implanted in the INCOR (Instituto do Coração), Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo (FMUSP). Hospital mortality amongst these patients was 7.1%. Anatomopathological studies identified five cases in which obstruction of the left ventricle outlet occurred after substitution of the mitral valve. Based on this experience, the indication of a hemodynamic study on the first postoperative day of a patient with an unexplained low cardiac output made it possible to identify obstruction of the left ventricle valve outlet in such patients, with resubstitution of the valve and a satisfactory evolution of the case. In this report we relate the six cases in detail and discuss the causes of the obstruction of the outlet in mitral valve substitutions. ARTIGOS ORIGINAIS Obstrução da via de saída de ventrículo esquerdo por prótese mitral: apresentação de seis casos Obstruction of the left ventricle outlet by mitral valve prosthesis: report of six cases Pablo M. A. Pomerantzeff; Yukio Kioka; Lauro T. Kawabe; José Otávio C. Auler Jr.; Edgard A. Lopes; Geraldo Verginelli; Adib D. Jatene Do Instituto do Coração do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo Endereço para separatas RESUMO De janeiro de 1982 a março de 1984, foram implantadas 170 biopróteses de pericárdio bovino e alto perfil, no Instituto do Coração do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, com mortalidade hospitalar de 7,1%. Através do estudo anatomopatológico, foram identificados cinco casos em que ocorreu obstrução da via de saída do ventrículo esquerdo após substituição da valva mitral. Com base nessa experiência, a indicação de estudo hemodinâmico no 1º dia de pós-operatório em paciente em baixo débito, sem explicação, possibilitou identificar obstrução da via de saída do ventrículo esquerdo, com retroca valvar e boa evolução. Neste trabalho, são relatados detalhadamente os seis casos e discutidas as causas da obstrução da via de saída na substituição mitral. Descritores: ventrículo esquerdo, via de saída, obstrução; próteses valvulares cardíacas, cirurgia, complicações; valva mitral, cirurgia, complicações. ABSTRACT From January/1982 to March/1984, 170 high profile bovine pericardium bioprostheses were implanted in the INCOR (Instituto do Coração), Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo (FMUSP). Hospital mortality amongst these patients was 7.1%. Anatomopathological studies identified five cases in which obstruction of the left ventricle outlet occurred after substitution of the mitral valve. Based on this experience, the indication of a hemodynamic study on the first postoperative day of a patient with an unexplained low cardiac output made it possible to identify obstruction of the left ventricle valve outlet in such patients, with resubstitution of the valve and a satisfactory evolution of the case. In this report we relate the six cases in detail and discuss the causes of the obstruction of the outlet in mitral valve substitutions. Descriptors: left ventricle outlet, obstruction; heart valves, mitral, surgery, complications. Texto completo disponível apenas em PDF. Full text available only in PDF format. Endereço para separatas: Pablo Pomerantzeff Divisão Cirúrgica Av. Dr. Enéas Carvalho de Aguiar, 44 05403 São Paulo, SP, Brasil Recebido para publicação em 1º de fevereiro de 1990. 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