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Background <p>Methicillin-resistant <i>Staphylococcus aureus</i> (MRSA) has emerged as a leading cause of endocarditis with poor outcomes. The magnitude and consistency of its mortality risk compared with methicillin-susceptible <i>S. aureus</i> (MSSA) remain uncertain.</p> Methods <p>Data were extracted from PubMed, Embase, Scopus, and Cochrane Library from database inception to 30 November 2025, without language restrictions. A random-effects model (Restricted Maximum-Likelihood) was used to calculate pooled risk ratios (RRs). Heterogeneity was explored by stratified and meta-regression analyses. Publication bias was assessed using funnel plot symmetry and Egger’s regression.</p> Results <p>Twenty-four studies, comprising 3291 patients (1,011 with MRSA and 2280 with MSSA), met the inclusion criteria. Pooled short-term mortality was significantly higher in MRSA endocarditis (30.9% vs 25.6%; RR 1.48, 95% CI 1.21-1.80; I² = 34%). Across stratified analyses by study design, setting, region, and study era, mortality remained consistently higher in MRSA endocarditis. No significant differences were found for heart failure (RR 1.08, 95% CI 0.90-1.30), embolic events (RR 0.82, 95% CI 0.51-1.33), stroke (RR 0.88, 95% CI 0.78-1.00), or surgery performed (RR 0.97, 95% CI 0.56-1.68) in MRSA and MSSA groups. No publication bias was revealed by Funnel-plot inspection and Egger’s test (<i>p</i> = 0.082). Meta-regression showed no effect modification by age, hospital-acquired infection, prosthetic valve, or right-sided endocarditis.</p> Conclusions <p>MRSA endocarditis carries a significantly higher short-term mortality than MSSA, consistent across study designs and study-level characteristics. The major complications were comparable between the two groups.</p> <p></p>

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Impact of methicillin resistance on mortality in Staphylococcus aureus endocarditis: a systematic review and meta-analysis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月29日

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  • Durga Shankar Meena,
  • Deepak Kumar,
  • Gopal Krishana Bohra

摘要

Background

Methicillin-resistant Staphylococcus aureus (MRSA) has emerged as a leading cause of endocarditis with poor outcomes. The magnitude and consistency of its mortality risk compared with methicillin-susceptible S. aureus (MSSA) remain uncertain.

Methods

Data were extracted from PubMed, Embase, Scopus, and Cochrane Library from database inception to 30 November 2025, without language restrictions. A random-effects model (Restricted Maximum-Likelihood) was used to calculate pooled risk ratios (RRs). Heterogeneity was explored by stratified and meta-regression analyses. Publication bias was assessed using funnel plot symmetry and Egger’s regression.

Results

Twenty-four studies, comprising 3291 patients (1,011 with MRSA and 2280 with MSSA), met the inclusion criteria. Pooled short-term mortality was significantly higher in MRSA endocarditis (30.9% vs 25.6%; RR 1.48, 95% CI 1.21-1.80; I² = 34%). Across stratified analyses by study design, setting, region, and study era, mortality remained consistently higher in MRSA endocarditis. No significant differences were found for heart failure (RR 1.08, 95% CI 0.90-1.30), embolic events (RR 0.82, 95% CI 0.51-1.33), stroke (RR 0.88, 95% CI 0.78-1.00), or surgery performed (RR 0.97, 95% CI 0.56-1.68) in MRSA and MSSA groups. No publication bias was revealed by Funnel-plot inspection and Egger’s test (p = 0.082). Meta-regression showed no effect modification by age, hospital-acquired infection, prosthetic valve, or right-sided endocarditis.

Conclusions

MRSA endocarditis carries a significantly higher short-term mortality than MSSA, consistent across study designs and study-level characteristics. The major complications were comparable between the two groups.