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Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat
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Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat

Published on: June 4, 2012

Retrospective evaluation of therapies for Staphylococcus aureus endocarditis

C A Gentry1, K A Rodvold, R M Novak

  • 1Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, 60612, USA.

Pharmacotherapy
|November 5, 1997
PubMed

Insights

Nafcillin may offer better outcomes for methicillin-sensitive Staphylococcus aureus (MSSA) endocarditis compared to vancomycin, though mortality rates were similar. Vancomycin use in MSSA endocarditis was linked to more comorbidities and complications.

Area of Science:

  • Infectious Diseases
  • Cardiology
  • Pharmacology

Background:

  • Endocarditis is a serious infection of the heart's inner lining, often caused by Staphylococcus aureus.
  • Both methicillin-sensitive (MSSA) and methicillin-resistant (MRSA) strains require effective anti-infective therapy.
  • Treatment choices for Staphylococcus aureus endocarditis include nafcillin and vancomycin, with varying clinical implications.

Purpose of the Study:

  • To retrospectively evaluate and compare the effectiveness of anti-infective therapies for MSSA and MRSA endocarditis.
  • To assess treatment outcomes associated with nafcillin versus vancomycin in MSSA endocarditis.
  • To analyze mortality differences in MRSA endocarditis treated with vancomycin.

Main Methods:

  • Retrospective analysis of 57 treatment courses in 54 patients with Staphylococcus aureus endocarditis.
  • Comparison of nafcillin-treated MSSA endocarditis (27 courses) with vancomycin-treated MSSA (18 courses) and MRSA (11 courses) endocarditis.
  • Evaluation of baseline characteristics, complication rates, intensive care unit duration, response rates, and mortality.

Main Results:

  • Vancomycin-treated MSSA patients presented with more chronic conditions and higher serum creatinine levels than nafcillin-treated patients.
  • Vancomycin therapy was associated with higher complication rates and longer ICU stays in MSSA endocarditis.
  • While not statistically significant (p=0.12), nafcillin showed a trend towards higher complete response rates (74% vs 50%) in MSSA endocarditis; mortality was similar (22% vs 28%). MRSA patients treated with vancomycin had higher mortality (55%) compared to MSSA patients treated with vancomycin (28%).

Conclusions:

  • Vancomycin treatment for MSSA endocarditis may be associated with poorer outcomes compared to nafcillin, potentially due to more severe baseline clinical features in vancomycin recipients.
  • Mortality rates did not significantly differ between nafcillin and vancomycin for MSSA endocarditis.
  • Vancomycin treatment for MRSA endocarditis showed a higher mortality rate compared to vancomycin for MSSA endocarditis.

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