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A comparison of pneumonia caused by gentamicin, methicillin-resistant and gentamicin, methicillin-sensitive
Abstract:
We investigated an outbreak of nosocomial pneumonia due to gentamicin, methicillin-resistant Staphylococcus aureus (GMRSA). We compared the predisposing factors for pneumonia due to GMRSA to those for pneumonia due to gentamicin, methicillin-sensitive Staphylococcus aureus (GMSSA). Seventeen of 29 patients with staphylococcal pneumonia were infected with GMRSA. Risk factors and associated diseases which selected for infection with GMRSA as opposed to GMSSA included prior antibiotic therapy for a prolonged period of time (p = 0.0001), number of risk factors per patient (p = 0.0001), days hospitalized prior to diagnosis of pneumonia (p = 0.002) and number of associated diseases per patient (p = 0.002). Despite the epidemiologic differences between GMSSA and GMRSA pneumonia, there were no differences in the clinical presentation, course of illness, complications, response to appropriate therapy or outcome between the two groups. Survival was adversely affected by age only among the GMSSA patients (p = 0.02) and by the number of associated diseases (p = 0.005).
Insights
Gentamicin-resistant Staphylococcus aureus (GMRSA) caused nosocomial pneumonia in 17 patients. Prolonged prior antibiotic use and more comorbidities were key risk factors for GMRSA versus gentamicin-sensitive strains.
Area of Science:
- Infectious Diseases
- Hospital Epidemiology
- Antimicrobial Resistance
Background:
- Nosocomial pneumonia poses a significant healthcare challenge.
- Gentamicin-resistant Staphylococcus aureus (GMRSA) is an emerging pathogen.
- Understanding risk factors for GMRSA is crucial for infection control.
Purpose of the Study:
- To investigate an outbreak of nosocomial pneumonia caused by GMRSA.
- To compare predisposing factors for GMRSA pneumonia versus gentamicin-methicillin-sensitive Staphylococcus aureus (GMSSA) pneumonia.
Main Methods:
- Retrospective analysis of 29 patients with staphylococcal pneumonia.
- Comparison of risk factors, comorbidities, and clinical outcomes between GMRSA and GMSSA infected patients.
Main Results:
- GMRSA was identified in 17 of 29 patients.
- Prolonged prior antibiotic therapy, increased number of risk factors, longer hospitalization, and more comorbidities were associated with GMRSA infection.
- No significant differences in clinical presentation, illness course, complications, or treatment response were observed between GMRSA and GMSSA groups.
Conclusions:
- Specific risk factors, including extensive prior antibiotic exposure and higher comorbidity burden, predispose patients to GMRSA pneumonia.
- Despite epidemiological differences, GMRSA and GMSSA pneumonia share similar clinical characteristics and outcomes.
- Age impacted survival only in GMSSA patients, while comorbidity number affected survival in both groups.