Complication Rate After Antibiotic Prophylaxis with Fosfomycin Versus Fluorochinolones or β-lactam Antibiotics in Patients Undergoing Prostate Biopsy: A Propensity Score-adjusted Analysis.

Background: Transrectal ultrasound-guided prostate biopsy (TRBx) or transperineal Bx (TPBx) are considered alternative approaches for the diagnosis of prostate cancer (PCa). However, urinary tract infection (UTI) or other complications could be more frequent in the TRBx approach.

Objective: To determine the complication rate following different antimicrobial prophylaxis (AMP; fosfomycin trometamol [FT] vs ß-lactame or fluorochinolones [FQ]) in patients undergoing TRBx or TPBx.

Design, Setting, And Participants: The analyses were based on prospectively collected data of a cohort of patients who underwent TRBx or TPBx for elevated prostate-specific antigen (PSA; ≥4ng/ml) or clinical suspicion of PCa, between September 2016 and March 2017. Patients received a single dose of 3g oral FT (group A) or, alternatively, FQ or ß-lactame (group B).

Intervention: TRBx versus TPBx.

Outcome Measurements And Statistical Analysis: Adjustment variables consisted of age, PSA, biopsy technique (TPBx vs TRBx), and antibiotic prophylaxis (FT vs ß-lactame or FQ) using 1:1 propensity-score matching. Overall, 526 patients were considered, of whom 258 received FT (group A) and the other 258 received ß-lactame or FQ (group B).

Results And Limitations: Overall complications occurred in 390 (75.58%) and major complications in 67/516 (12.98%). Lower prevalence of UTIs was detected in group A (34.1%) compared with that in group B (43.4%; p=0.03), while similar rates of haematuria (54.7% vs 55.4%), haemospermia (39.5% vs 33.0%), and acute urinary retention (11.6% vs 9.3%) were detected in groups A and B. We found that group B (odds ratio [OR]: 1.54; p=0.03), I grade haematuria (OR: 6.17; p<0.01), and II grade haematuria (OR: 5.13; p<0.01) were significantly associated with increased risk of UTIs.

Conclusions: AMP with fluoroquinoles or ß-lactam antibiotics increased the rate of UTIs, when compared with FT, in patients undergoing TRBx or TPBx. The appearance of haematuria or haemospermia is associated with UTIs, suggesting the possibility of tailoring the strategy for prophylaxis in this category of patients.

Patient Summary: In this study, comparing complications after transrectal ultrasound-guided prostate biopsy versus transperineal biopsy, prophylaxis with fluoroquinoles or ß-lactam antibiotics increased the rate of urinary tract infections when compared with fosfomycin trometamol, regardless of the type of biopsy approach.