Viridans streptococcal endocarditis: clinical, microbiological, and echocardiographic correlations

Area of Science:

• Infectious Diseases
• Cardiology
• Microbiology

Background:

• Viridans streptococci are known to cause endocarditis.
• Clinical presentations of viridans streptococcal endocarditis vary.
• Prosthetic valve endocarditis often carries a worse prognosis.

Purpose of the Study:

• To investigate the clinical characteristics and outcomes of viridans streptococcal endocarditis.
• To assess the role of echocardiography in diagnosing complications.
• To evaluate the accuracy of bacterial species identification in clinical laboratories.

Main Methods:

• Retrospective study of 36 patients with viridans streptococcal endocarditis.
• Analysis of clinical data, echocardiographic findings, and microbiological identifications.
• Inter-laboratory comparison of bacterial strain identification.

Main Results:

• Complications occurred in 32% of native valve and 80% of prosthetic valve endocarditis cases.
• Echocardiography detected vegetations in 72% of patients; vegetations correlated with complications in native valve endocarditis (P = .03).
• Significant inter-laboratory variability was observed in species identification of viridans streptococci.

Conclusions:

• Viridans streptococcal endocarditis can present with a severe clinical course.
• Echocardiographic detection of vegetations is a significant predictor of complications.
• Inconsistent species identification among laboratories poses a challenge for accurate diagnosis and treatment.