AUA-recommended Antibiotic Prophylaxis for Primary Penile Implantation Results in a Higher, Not Lower, Risk for
David W Barham1, Nikolaos Pyrgidis2, Martin S Gross3
1Department of Urology, University of California, Irvine, Orange, California.
Purpose:
Our aim was to determine if the AUA-recommended prophylaxis (vancomycin + gentamicin alone) for primary inflatable penile prosthesis surgery is associated with a higher infection risk than nonstandard regimens.
Materials And Methods:
We performed a multicenter, retrospective study of patients undergoing primary inflatable penile prosthesis surgery. Patients were divided into those receiving vancomycin + gentamicin alone and those receiving any other regimen. A Cox proportional-hazards model was constructed adjusted for major predictors. A subgroup analysis to identify the appropriate dosage of gentamicin was also performed.
Results:
A total of 4,161 patients underwent primary inflatable penile prosthesis placement (2,411 received vancomycin + gentamicin alone and 1,750 received other regimens). The infection rate was similar between groups, 1% vs 1.2% for standard vs nonstandard prophylaxis. In the multivariable analysis, vancomycin + gentamicin (HR: 2.7, 95% CI: 1.4 to 5.4, P = .004) and diabetes (HR: 1.9, 95% CI: 1.03 to 3.4, P = .04) were significantly associated with a higher risk of infection. Antifungals (HR: 0.08, 95% CI: 0.03 to 0.19, P < .001) were associated with lower risk of infection. There was no statistically significant difference in infection rate between weight-based gentamicin compared to 80 mg gentamicin (HR: 2.9, 95% CI: 0.83 to 10, P = .1).
Conclusions:
Vancomycin + gentamicin alone for antibiotic prophylaxis for primary inflatable penile prosthesis surgery is associated with a higher infection risk than nonstandard antibiotic regimens while antifungal use is associated with lower infection risk. A critical review of the recommended antimicrobial prophylactic regimens is needed. Prospective research is needed to further elucidate best practices in inflatable penile prosthesis antimicrobial prophylaxis.
Insights
The standard antibiotic prophylaxis of vancomycin plus gentamicin alone for inflatable penile prosthesis surgery may increase infection risk. Antifungal use was linked to a lower risk, suggesting a need to review current prophylaxis guidelines.
Area of Science:
- Urology
- Infectious Diseases
- Surgical Outcomes
Background:
- The American Urological Association (AUA) recommends vancomycin plus gentamicin for antibiotic prophylaxis in primary inflatable penile prosthesis (IPP) surgery.
- The optimal antibiotic regimen to minimize infection risk following IPP implantation remains an area of active investigation.
Approach:
- A multicenter, retrospective study analyzed 4,161 patients undergoing primary IPP surgery.
- Patients were stratified based on receiving vancomycin + gentamicin alone versus alternative prophylactic regimens.
- A Cox proportional-hazards model was employed for multivariable analysis, with a subgroup analysis on gentamicin dosage.
Key Points:
- The infection rate was similar between the standard (vancomycin + gentamicin alone) and nonstandard prophylaxis groups (1% vs. 1.2%).
- Multivariable analysis identified vancomycin + gentamicin (HR: 2.7) and diabetes (HR: 1.9) as significantly associated with increased infection risk.
- Antifungal use demonstrated a protective effect, significantly reducing infection risk (HR: 0.08).
Conclusions:
- The standard vancomycin + gentamicin regimen for IPP surgery is associated with a higher infection risk compared to nonstandard regimens.
- Antifungal administration appears to lower the risk of infection after IPP placement.
- Current AUA-recommended prophylactic regimens warrant critical review, and prospective studies are needed to establish optimal practices.
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