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Risk factors for postoperative infection
R A Garibaldi1, D Cushing, T Lerer
1Department of Medicine, University of Connecticut Health Center, Farmington 06030.
The American Journal of Medicine
|September 16, 1991
Summary
Four key factors predict postoperative wound infections: wound class, patient status, surgery length, and intraoperative cultures. Perioperative antibiotics may increase infection risk from resistant bacteria.
Area of Science:
- Infectious Disease Epidemiology
- Surgical Site Infection Surveillance
- Antimicrobial Stewardship
Background:
- Postoperative wound infections (PWIs) pose a significant risk to surgical patients.
- Identifying critical risk factors and understanding infection etiology are crucial for effective prevention and treatment.
Purpose of the Study:
- To identify independent risk factors for PWIs.
- To analyze the impact of perioperative antibiotics on PWI bacteriology.
Main Methods:
- Prospective collection of epidemiologic data and intraoperative wound cultures from 1,852 patients over 4 years.
- Stepwise logistic regression analysis to determine predictive risk factors for PWI.
- Comparison of PWI characteristics between patients who received perioperative antibiotics and those who did not.
Main Results:
- Four independent risk factors for PWI were identified: surgical wound class, American Society of Anesthesiologists physical status, duration of surgery, and intraoperative culture results.
- Positive intraoperative cultures had limited clinical utility due to low predictive value (32%) and high false-positive rates (82%).
- Patients receiving perioperative antibiotics who developed infections were often infected with resistant organisms.
Conclusions:
- Surgical wound class, ASA status, surgery duration, and intraoperative cultures are key predictors of PWI.
- Intraoperative cultures have low clinical utility for predicting PWI.
- Perioperative antibiotic use may be associated with infections caused by resistant pathogens, necessitating careful consideration of antibiotic stewardship.