Comparison of Preoperative Urine Culture and Intraoperative Renal Pelvis Culture in Patients Who Underwent Flexible Ureterorenoscopy

Abstract

Objective:There is no correlation between the preoperative bladder urine culture (PBUC) sensitivity test and the results of the renal pelvic urine culture (RPUC) test.Materials and Methods:A total of 129 patients who underwent f-URS included the study. Preoperatively, PBUC was collected in all cases, and RPUC was taken when starting the surgery.Results:In PBUC, there was growth in 25 (19.4%) patients and in RPUC, there were only in 35 (27.1%) cases. Preoperative tomographic urine density at the renal pelvis [odds ratio (OR): 0.848, p<0.001], grade ≥2 hydronephrosis (OR: 18.970, p=0.001), and lower calyceal stone location (OR: 0.033, p=0.017) were determined as independent predictive factors for RPUC growth. The ability of tomographic urine density to foresee positive RPUC positivity was determined to be 0.858 (0.780-0.936). The tomographic urine density threshold for RPUC positivity prediction was 4.5, with 80% sensitivity and 77.7% specificity.Conclusion:PBUCs do not necessarily mean accurate colonization. Obtaining renal pelvis urine samples is important for managing postoperative infectious complications. Patients that have preoperative hydronephrosis and nominal tomographic urine density could develop RPUC even if the preoperative bladder urine samples are negative.

Keywords

• bladder urine culture
• renal pelvic urine culture
• rirs