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Surgical site infections associated with methicillin-resistant Staphylococcus aureus: do postoperative factors play a
Farrin A Manian1, P Lynn Meyer, Janice Setzer
1Department of Infection Control, St. John's Mercy Medical Center, Creve Coeur, MO 63141, USA. manianfa@aol.com
Abstract:
Patients with surgical site infections (SSIs) who underwent surgery during the period of September 1997 through December 1999 and January through July 2001 were retrospectively studied to compare patients infected with methicillin-resistant Staphylococcus aureus (MRSA) with those infected with organisms other than MRSA. Of patients with SSI who had known culture results, 77 (28.5%) of 270 had cultures that yielded MRSA. On univariate analysis, age of >or=70 years, duration of surgery of >or=4 h, duration of postoperative antibiotic treatment of >1 day, and discharge to a long-term care facility (LTCF) were significantly associated with MRSA SSI (P<.05 for all). On multivariate analysis, only discharge to an LTCF (odds ratio [OR], 2.3; P=.04) and duration of postoperative antibiotic treatment of >1 day (OR, 2.0; P=.03) were significantly associated with MRSA SSI; there was also a trend toward MRSA SSI being associated with use of a surgical drain for >1 day (P=.078). Postoperative factors may play a more important role in the causation of MRSA SSI than has previously been appreciated.
Insights
Methicillin-resistant Staphylococcus aureus (MRSA) surgical site infections (SSIs) are linked to longer surgeries and antibiotic use. Post-surgery factors like long-term care facility discharge significantly increase MRSA SSI risk.
Area of Science:
- Infectious Diseases
- Surgical Outcomes
- Healthcare Epidemiology
Background:
- Surgical site infections (SSIs) are a significant concern in healthcare settings.
- Methicillin-resistant Staphylococcus aureus (MRSA) is a common pathogen causing SSIs.
- Understanding risk factors for MRSA SSIs is crucial for prevention.
Purpose of the Study:
- To compare risk factors for MRSA SSIs versus non-MRSA SSIs.
- To identify patient and surgical characteristics associated with MRSA SSI.
- To evaluate the role of postoperative factors in MRSA SSI causation.
Main Methods:
- Retrospective study of patients with SSIs between September 1997-December 1999 and January-July 2001.
- Culture results were analyzed to identify MRSA and other pathogens.
- Univariate and multivariate analyses were performed to assess risk factors.
Main Results:
- MRSA was identified in 28.5% of patients with known culture results (77/270).
- Univariate analysis showed age, surgery duration, postoperative antibiotic duration, and LTCF discharge were associated with MRSA SSI.
- Multivariate analysis identified LTCF discharge (OR 2.3) and prolonged postoperative antibiotic treatment (OR 2.0) as significant risk factors for MRSA SSI.
Conclusions:
- Postoperative factors, particularly discharge to a long-term care facility and extended antibiotic use, are significantly associated with MRSA SSIs.
- These findings suggest postoperative management plays a critical role in MRSA SSI development.
- Further research into mitigating these postoperative risk factors is warranted.