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Narayanan MA, Haddad TM, Kalil AC. 2016 Heart doi:10.1136/heartjnl-2015-308589

Objective
Infective endocarditis is associated with high morbidity and mortality and optimal timing for surgical intervention is unclear. We performed a systematic review and meta-analysis to compare early surgical intervention with conservative therapy in patients with infective endocarditis.

Methods
PubMed, Cochrane, EMBASE, CINAHL and Google-scholar databases were searched from January 1960 to April 2015. Randomised controlled trials, retrospective cohorts and prospective observational studies comparing outcomes between early surgery at 20 days or less and conservative management for infective endocarditis were analysed.

Results
A total of 21 studies were included. OR of all-cause mortality for early surgery was 0.61 in unmatched groups and 0.41 in the propensity-matched groups. For patients who had surgical intervention at 7 days or less, OR of all-cause mortality was 0.61 (95% CI 0.39 to 0.96, p=0.034) and in those who had surgical intervention within 8–20 days, the OR of mortality was 0.64 compared with conservative management. In propensity-matched groups, the OR of mortality in patients with surgical intervention at 7 days or less was 0.30 and in the subgroup of patients who underwent surgery between 8 and 20 days was 0.51. There was no significant difference in in-hospital mortality, embolisation, heart failure and recurrence of endocarditis between the overall unmatched cohorts.

Conclusion
The results of our meta-analysis suggest that early surgical intervention is associated with significantly lower risk of mortality in patients with infective endocarditis.

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