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Risk factors of early mortality after surgical treatment for infective endocarditis.

OBJECTIVES: To explore the basic clinical characteristics and relevant factors affecting the early postoperative prognosis in patients with infective endocarditis (IE).

METHODS: A total of 702 patients with IE, who underwent surgery in Xiangya Hospital, Central South University from January 1981 to June 2019, were studied and the data were collected through the paper records and the hospital information system. The patients from January 1981 to June 2010 served as an early group ( n =224), and other patients from July 2010 to June 2019 served as a recent group ( n =478). Independent risk factors for early postoperative death were determined by logistic regression analysis.

RESULTS: The mean age of the 702 patients was 36.7±16.1 years, and the male accounted for 68.1%. Preoperative stroke occurred in 71 patients (10.1%), and dialysis was done in 14 patients (2%) preoperatively. Streptococcus were the pathogenic bacteria in 172 patients, accounting for 59.5% of all positive blood culture results. In the early group, the percentage of IE combined with congenital heart disease was significantly higher than that in the recent group [77 patients (34.4%) in the early group vs 22 patients (4.6%) in the recent group; P <0.05]. Postoperative stroke occurred in 15 patients (2.1%), while 59 patients (7%) required new dialysis postoperatively because of renal insufficiency. Twenty-nine patient died in the post-operation, with 4.1% in 30-day mortality. Logistic regression analysis revealed that the high preoperative New York Heart Association (NYHA) grade of cardiac function (OR=3.22, 95% CI 1.50-6.88; P <0.01), postoperative stroke (OR=5.75, 95% CI 1.22-27.07; P <0.05), postoperative dialysis (OR=15.53, 95% CI 3.50-68.82; P <0.01), perivalvular abscess (OR=13.19, 95% CI 3.83-45.42; P <0.01) and multivalve involvement (OR=3.57, 95% CI 1.24-10.30; P <0.05) were the independent risk factors for early mortality.

CONCLUSIONS: Streptococcus is the most common pathogenic bacteria in the patients with IE. Surgery for IE can obtain a satisfactory early outcomes. High preoperative NYHA grade of cardiac function, postoperative stroke, postoperative dialysis, perivalvular abscess and multivalve involvement are the independent risk factors for early mortality.

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