Abstract
The operative results of 249 mitral valvular reoperations performed in 215 patients from 1974 through 1986 were reviewed to identify groups at greater risk. Two to 4 reoperations were performed in 28 patients. The mean interval between the first and second valve procedures was 47 ± 40 months. The most common indications for reoperation were degeneration of bioprostheses (44%) and thrombosis of mechanical prostheses (26%). Thirty patients (12%) died. This rate was significantly higher (p < 0.02) than that for primary valve procedures performed during the same period. The mortality rate for elective reoperations was 7%. Mortality rates were higher among patients with prosthetic valve endocarditis (6 of 17 cases, 35%), in those undergoing operation on an emergency basis (19 of 82, 23%) and when tricuspid valve replacement or anuloplasty was also performed (9 of 38, 24%) (p < 0.02). No significant correlation was found between mortality rates and the age or sex of the patients and the types of prosthesis used originally.
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