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Methicillin-resistant staphylococci and their treatment in the intensive care unit

Jose M Eguia1, Henry F Chambers

  • 1Division of Infectious Diseases, Department of Medicine, San Francisco General Hospital, San Francisco, California, USA. jeguia@itsa.ucsf.edu

Seminars in Respiratory and Critical Care Medicine
|August 10, 2005
PubMed

Insights

Methicillin-resistant Staphylococcus aureus (MRSA) infections are common in healthcare settings. While vancomycin is preferred for severe MRSA, alternative treatments exist, but may have worse outcomes.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Pharmacology

Background:

  • Methicillin resistance in Staphylococcus aureus (MRSA) and coagulase-negative staphylococci (MRCNS) is a growing public health concern, especially within healthcare environments.
  • The clinical impact of methicillin resistance on patient outcomes for staphylococcal infections remains incompletely understood, with some studies indicating higher mortality for MRSA compared to methicillin-sensitive Staphylococcus aureus (MSSA).

Purpose of the Study:

  • To review current treatment strategies for methicillin-resistant staphylococcal infections.
  • To evaluate the efficacy and safety of different antimicrobial agents used in managing MRSA and MRCNS infections.

Main Methods:

  • Literature review of studies investigating treatment outcomes for MRSA and MRCNS infections.
  • Analysis of clinical data comparing vancomycin-based regimens with alternative agents like linezolid and quinupristin/dalfopristin.
  • Examination of treatment options for both severe and less severe staphylococcal infections.

Main Results:

  • Vancomycin-based regimens are the preferred treatment for serious methicillin-resistant staphylococcal infections.
  • Linezolid and quinupristin/dalfopristin are considered second-line alternatives for severe infections when vancomycin is not tolerated, despite some trends suggesting potentially worse outcomes.
  • For less severe infections, trimethoprim-sulfamethoxazole or fluoroquinolones combined with rifampin are viable treatment options.

Conclusions:

  • Effective management of MRSA and MRCNS infections requires careful consideration of treatment guidelines and patient-specific factors.
  • While vancomycin remains a cornerstone for severe infections, alternative agents and treatment strategies are available for specific clinical scenarios.
  • Ongoing research is crucial to further elucidate the clinical significance of methicillin resistance and optimize therapeutic approaches.

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