Analysis of the incidence and risk factors of male urinary tract infection following urodynamic study

The purpose of this study was to investigate the incidence and risk factors of male urinary tract infection (UTI) after urodynamic study (UDS). A total of 854 consecutive male patients, who underwent UDS at Peking Union Medical College Hospital from January 2010 to March 2016, were recruited in this study. Two to four weeks before the examination, urinalysis with bacterial culture was performed. Patients with negative results were selected for UDS. Immediately before the examination, urinalysis was repeated to rule out any preoperative UTI. Between 48 and 72 h after the exam, urine culture was performed again to determine the incidence of UTI. The incidence of UTI and patients’ baseline characteristics, including age, medical history, urodynamic parameters, current diagnosis and pathogen type, were analyzed. Among the 854 patients undergoing UDS, urinary infection was found in 84 cases after the examination, the incidence was 9.83%. Comorbidity with diabetes, post void residual (PVR), volume of prostate (Vp), and two urodynamic parameters, maximal flow rate (Qmax) and average flow rate (Qav) were found to be the independent risk factors for UTI after UDS. The most common pathogens were Escherichia coli (54.76%) and Enterococcus faecalis (19.05%). The incidence of UTI after UDS in male patients was 9.83%. Patients who suffered from comorbidity of diabetes, high PVR, high Vp, low Qmax or Qav may need to be treated with prophylactic antibiotics to prevent postoperative UTI.