Female Urology

Risk factors for UTI after BTX

Impact of Duration of Antibiotic Prophylaxis on Incidence of UTI after OnabotulinumtoxinA Injection

The Glickman Urological Institute Center for Female Pelvic Medicine and Reconstructive Surgery sees many patients with both overactive bladder (OAB) and refractory OAB (when first-line behavioral and second-line medication approaches do not work or are not tolerated). Among the options for refractory OAB, the center commonly uses sacral neuromodulation and onabotulinum toxinA injections (BTX) (Botox®, Allergan). With the use of BTX, the rate of urinary tract infections post procedurally has been quoted in the literature to be between 5%-20%. To minimize this risk, one typically administers oral antibiotics around the time of the procedure; however, the FDA and drug package insert recommends 1-3 days of pre-treatment antibiotics with 1-3 days of post-treatment antibiotics. This differs from world-wide best practice statements. Using this discrepant periprocedural antibiotic regimen, clinicians at the center performed a retrospective cohort analysis of patients with both idiopathic and neurogenic detrusor overactivity who underwent BTX injections with different antibiotic routines. Those routines were: single dose vs no antibiotics, 3-7 days post procedure vs no antibiotics and 3-7 days vs single dose antibiotic.

Risk factors for UTI after BTX
Antibiotic prophylaxis regimen
Single day vs None0.31 (0.18-0.52)<.0010.34 (0.19-0.61)<.001
3-7 days vs None0.50 (0.27-0.93).0270.47 (0.24-0.92).029
3-7 days vs Single day1.63 (0.98-2.71).0611.38 (0.80-2.38).249

BTX = Botox, UTI = urinary tract infection

Column 1: unadjusted

Column 2: adjusted (multivariate analysis) showing differences in single dose vs no antibiotics and none in the other groups

Patients who received any antibiotic had a lower 30-day UTI rate than those who received no antibiotic. The addition of multiday antibiotics (3-7 days) did not confer any benefit with UTI reduction. These findings are important in an era of antibiotic stewardship and resistant bacteria to minimize the unnecessary use of excess antibiotics.