[Trends in the profile of infective endocarditis at a university hospital in Tunis]

Infective endocarditis (IE) is a serious disease for which diagnosis and treatment continue to develop. Purpose of work. To analyze trends in its epidemiologic, clinical, and microbiologic characteristics, as well as its treatment and outcome.

Retrospective review of data of 135 patients admitted to our adult cardiology department from January 1981 through December 2011. IE was diagnosed according to the modified Duke Criteria. We defined 2 groups of patients according to their date of admission: group A (n = 55), patients admitted before 1995, and group B (n = 80), patients admitted in and after 1995.

The entire population was predominantly male, and their mean age was 38.5 ± 16 years, 36 years in group A and 44 years in group B. IE affected mainly native valves (90% group A, 74% group B; p<0.05). Prosthetic IE was more frequent in group B (20% vs 10%, p<0.05), and the portal of entry identified more often (59% vs 22%; p = 0.03). Blood cultures were negative in 78% of patients in group A vs 57.5% in group B (p = 0.04). The principal causative microorganism was streptococcus before 1995 and staphylococcus after 1995, but this difference was not significant. Heart failure was more frequent in group A (p = 0.05). Embolic events affected 27% of the patients in group A vs 32.5% in group B (p = 0.05). The rate of surgery (51% in group A vs 62.5% in group B) did not differ significantly. The in-hospital mortality rate was 53% in group A vs 11% in group B (p<0.001); operative mortality was also higher in group A (p<0.001).

Our work shows changes in the epidemiologic characteristics of IE that parallel changes in demographic and risk factors. The progress of diagnosis and surgery explains the better prognosis for this pathology today.