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Infection problems for the 1990's--do we have an answer?
1College of Physicians & Surgeons, Columbia University, New York, New York 10032.
Abstract:
There is and has been continued change in organisms causing infection in the hospital. In the past few years, although Gram-negative bacteria have remained a major cause of mortality, Gram-positive bacteria and fungi have become increasingly important. This has caused organisms such as methicillin-resistant staphylococci, enterococci, Xanthomonas maltophilia and multiply resistant Pseudomonas aeruginosa to be common pathogens. Can this difficult state of affairs be changed by better antimicrobial prescribing practices? Yes and no. Virtually any agent will select MRSA and MRSE since the chromosomal location of the resistance of multiple-antibiotics makes such selection common and explains the rapid rate of the fluoroquinolones as therapy of MRSA. Restriction of oral vancomycin will markedly reduce the pressure to select Enterococcus faecium and thus limit the spread of the organisms and delay transmission of glycopeptide resistance to S. aureus. Judicious use of antibiotics in the intensive care environment will be major factor in "saving" antibiotics for other patients since the ICU patient goes to other parts of the hospital carrying with him/her the baggage of resistant Staphylococcus haemolyticus, klebsiella, P. aeruginosa, acinetobacter, enterobacter, xanthomonas and Pseudomonas cepacia. All of these organisms have the potential to become resistant to the agents heretofore used to treat them and are common in ICU patients.
Insights
Antimicrobial resistance is increasing, with Gram-positive bacteria and fungi becoming more prevalent. Better prescribing practices can help manage resistant organisms like MRSA and vancomycin-resistant enterococci.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Hospital Epidemiology
Background:
- Hospital-acquired infections are evolving, with a rise in Gram-positive bacteria and fungi alongside Gram-negative pathogens.
- Emerging resistant organisms include methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant enterococci (VRE), and multidrug-resistant Gram-negative bacteria.
- Intensive Care Unit (ICU) patients often carry a diverse range of resistant bacteria, posing a risk of transmission throughout the hospital.
Purpose of the Study:
- To investigate the impact of antimicrobial prescribing practices on the emergence and spread of resistant hospital-acquired pathogens.
- To evaluate strategies for mitigating antimicrobial resistance, focusing on Gram-positive bacteria, fungi, and multidrug-resistant Gram-negative organisms.
- To assess the role of judicious antibiotic use in intensive care settings in preserving antibiotic efficacy for other patient populations.
Main Methods:
- Analysis of trends in hospital-acquired infections and pathogen resistance patterns.
- Review of antimicrobial prescribing practices and their correlation with resistance selection.
- Case study analysis of specific resistant organisms and their transmission dynamics.
Main Results:
- Certain antimicrobial agents can inadvertently select for resistant strains, such as fluoroquinolones selecting for MRSA.
- Restricting oral vancomycin use can reduce selective pressure for vancomycin-resistant Enterococcus faecium and limit glycopeptide resistance transmission.
- Judicious antibiotic use in ICUs is crucial for conserving effective treatments, as ICU patients frequently harbor and disseminate multiple resistant organisms.
Conclusions:
- Antimicrobial stewardship is essential to combat the growing threat of resistant hospital-acquired infections.
- Targeted interventions, like vancomycin restriction, can significantly impact the prevalence of specific resistant pathogens.
- Optimizing antibiotic use in critical care settings is vital for maintaining treatment options across the hospital.