RESUMEN
INTRODUCTION AND OBJECTIVES: The aim of this study was to describe the predictors of hospital mortality found in patients admitted for infective endocarditis (IE) to a cardiovascular surgery ward. Patients and method. Prospective study of 186 patients with IE treated in our hospital between 1992 and 2001. RESULTS: One hundred fourteen patients (61.3%) had native valve endocarditis and 72 (38.7%) had prosthetic valve endocarditis (early in 28 patients [up to 12 months after surgery] and late in 44 [later than 12 months]). Blood cultures were positive in 82%. The predominant organism was Streptococcus viridans (36%) in native valve endocarditis and Staphylococcus aureus (33%) in prosthetic valve endocarditis. The hospital mortality was 22.6%. Severe sepsis (4.8%) produced a high mortality rate (88%) and was caused by Staphylococcus aureus in 60%. One hundred nineteen patients (64%) required surgery, 79 (66.4%) of them urgently. Negative blood cultures predicted need for surgery in native valve endocarditis (p < 0.05). The surgical mortality was 21.8% and was related to NYHA III-IV class (p = 0.014) and emergency surgery (p = 0.009) in patients with native valve endocarditis. This last factor also predicted higher surgical mortality in patients with early prosthetic valve endocarditis (p < 0.001). CONCLUSIONS: The hospital mortality of this group of patients with infective endocarditis treated in a tertiary medical center was high. The presence of severe sepsis, although infrequent, had a somber prognosis. Severe heart failure in native valve endocarditis and urgent surgery in native and prosthetic valve endocarditis increased surgical mortality.