Introduction:

Staphylococcus aureus is one of the most common sources of infectious endocarditis. There are few studies in Latin America that report on the differences between the methicillin resistance profiles.

Objective:

To describe the characteristics and clinical course of patients with methicillin-sensitive S. aureus (MSSA) compared to methicillin-resistance S. aureus (MRSA)

Methods:

An observational, retrospective study was conducted on a historical cohort of adult patients with a confirmed diagnosis of endocarditis between the years 2011 and 2015. Patients positive for S. aureus were selected and the characteristics and clinical course and the cases of MSSA were compared with those of MRSA.

Results:

A total of 86 patients with endocarditis were included, of whom 28 (33%) had an infection due to S. aureus, and 21 (75%) had endocarditis due to methicillin-sensitive S. aureus, and 7 (25%) due to MRSA. In the MSSA group, 11 (52.3%) were infections associated with health care. The majority (85.7%) of cases of MRSA were community acquired. The endocarditis mortality due to MSSA was higher than that caused by MRSA (33.3% vs. 14%).

Conclusions:

S. aureus continues to be the most common agent in endocarditis, with MSSA being more common. The embolic events and the severity were greater in MSSA. The majority of endocarditis due to MRSA is acquired in the community, and for this reason it is suggested starting empirical cover against MRSA in all cases of community acquired endocarditis.

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