Double-valve infective endocarditis: clinical features and prognostic impact--a retrospective study in a surgical centre

Most cases of infective endocarditis (IE) involve a single valve, and little is known concerning IE that simultaneously affects two valves. The involvement of more than one valve may imply more severe and extensive cardiac lesions. In these patients, surgery may be challenging. We aimed to determine the clinical characteristics, the therapeutic strategy, and the prognostic impact of double-valve IE (DVIE). We retrospectively included in the analysis that 440 consecutive patients with definite active IE in a single surgical centre. DVIE occurred in 75 of the total enrolled 440 patients (17%) and involved mostly the combination of mitral and aortic valves (N = 63, 84%). Most patients had double-native IE (N = 45, 60%). Staphylococci were less frequent in patients with double-valve than single-valve IE (SVIE). The proportion of patients undergoing valve repair among those treated surgically was higher for patients with DVIE than for SVIE (p < 0.03). Valve repair of at least one valve was associated with non-significant better survival than double replacement. DVIE was associated with higher all-cause mortality than SVIE (p < 0.013) and a higher relapse rate (p = 0.023). DVIE was not associated with a higher risk of composite non-fatal adverse events. DVIE represents a considerable proportion of overall cases of IE, mainly involving aortic and mitral valves, with a jet lesion on the mitral valve; Staphylococcus is significantly less frequent than in SVIE; DVIE is independently associated with higher mortality and relapse rate; finally, mitral valve repair is feasible in a considerable proportion of surgical cases.