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Eur J Cardiothorac Surg 2002;22:922-926
© 2002 Elsevier Science NL

Multivariate analysis of risk factors for hospital mortality in valvular reoperations for prosthetic valve dysfunction

InCor – Heart Institute, University of São Paulo Medical School, São Paulo, Brazil

Received 6 June 2002; received in revised form 26 August 2002; accepted 6 September 2002.

* Corresponding author. Heart Institute, Av. Dr. Enéas de Carvalho Aguiar, 44, Cerqueira César, CEP: 05403-000, São Paulo, SP, Brazil. Tel.: +55-11-30695638; fax: +55-11-30695415
e-mail: carlos.brandao{at}incor.usp.br

Objectives: The purpose of the study was to analyze risk factors for hospital mortality in patients undergoing valvular reoperations for prosthetic valve dysfunction. Methods: We performed a prospective analysis of 146 patients who underwent valvular reoperations for prosthetic valve dysfunction between July 1995 and June 1999 at the Heart Institute of the University of São Paulo Medical School. Multivariate statistical analysis with logistic regression was used to analyze preoperative and intraoperative variables to determine risk factors for hospital mortality. Results: The overall hospital mortality was 10.9% (16 patients). Univariate analysis showed that the following variables were associated with higher mortality rates: advanced New York Heart Association (NYHA) functional class, increased creatinine level, prolonged extracorporeal circulation time and treatment of annular abscess. Logistic multivariate analysis identified advanced NYHA functional class and a creatinine level higher than 1.5 mg/dl as independent predictors of hospital mortality. Conclusions: Advanced NYHA functional class and higher creatinine levels were independent predictors of hospital mortality in patients submitted for valvular reoperations for prosthetic valve dysfunction.

Key Words: Prosthesis • Reoperation • Surgery • Hospital mortality • Risk factors

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