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[Endocarditis caused by Staphylococcus aureus in drug addicts and non-addicts: the same microbe in 2 diseases]
Abstract:
46 Staphylococcus aureus endocarditis episodes diagnosed with strict criteria in non drug addict patients, and 25 episodes in drug addict patients have been comparatively analyzed. Infection was found in the left side of the heart in 87% of the non addict patients and in 16% of the addicts. On the contrary, 84% of the addicts had endocarditis of the tricuspid and pulmonary valves while only 13% of the non addicts had right heart involvement. The right side endocarditis in the non addicts was always due to intracardiac catheters. 54% of the endocarditis episodes in the non addicts were fatal. Only two addicts, both when had left side endocarditis, died. Mortality was conditioned by infection of the left side of the heart as well as by the existence of heart failure. No significant differences were found between the evolution of patients treated with only one agent or of those treated with a beta-lactam antibiotic plus gentamicin. The emergency valve replacement significantly improved the prognosis of patients with prosthetic valve endocarditis.
Insights
Staphylococcus aureus endocarditis presentation differs between non-drug users and intravenous drug users. Left-sided heart infections are common in non-users, while right-sided infections prevail in users, impacting mortality rates.
Area of Science:
- Cardiology
- Infectious Diseases
- Clinical Medicine
Background:
- Staphylococcus aureus is a leading cause of infective endocarditis.
- Endocarditis epidemiology and clinical presentation can vary significantly between patient populations, including intravenous drug users (IDUs) and non-IDUs.
Purpose of the Study:
- To comparatively analyze the clinical presentation, valve involvement, and outcomes of Staphylococcus aureus endocarditis in non-drug addict patients versus drug addict patients.
- To identify factors influencing mortality in Staphylococcus aureus endocarditis.
Main Methods:
- Retrospective analysis of 46 Staphylococcus aureus endocarditis episodes in non-drug addict patients and 25 episodes in drug addict patients.
- Comparison of heart valve involvement (left-sided vs. right-sided), etiological factors, treatment strategies, and mortality rates between the two groups.
Main Results:
- Non-drug addict patients predominantly had left-sided heart endocarditis (87%), whereas drug addict patients frequently presented with right-sided valve involvement (84%).
- Right-sided endocarditis in non-drug addicts was associated with intracardiac catheters.
- Mortality was significantly higher in non-drug addict patients (54%) compared to drug addict patients (approximately 8%).
- Left-sided heart infection and heart failure were identified as key factors contributing to mortality.
Conclusions:
- Staphylococcus aureus endocarditis exhibits distinct patterns of valve involvement and outcomes in non-drug addict and drug addict populations.
- Prompt diagnosis and management, including consideration for emergency valve replacement in specific cases, are crucial for improving prognosis.