Comparison of Diagnostic Accuracies of Commonly Used Trial of Void Parameters
Objective: The aim of the study was to compare the diagnostic accuracies of common postoperative TOV parameters.
Design: The study population comprised a prospective cohort undergoing outpatient urogynecologic procedures at a tertiary referral center from September 2018 to June 2021. Participants recorded their postvoid residual volume (PVR), voided volume, and subjective force of stream (sFOS) for all postoperative voids until meeting criteria to stop. The primary outcome was the sensitivity of TOV parameters in predicting postoperative urinary retention, defined as PVR ≥1/2 voided volume on the first 2 postoperative voids. Sample size was set at 183 to detect a 20% difference (α = 0.05, β = 0.2, up to 20% with missing data) in sensitivity between TOV parameters. Diagnostic accuracies were compared with McNemar’s test for paired proportions, with Youden’s index calculated to determine optimal thresholds.
Results: The 160 participants had a mean age of 52.1 ± 11.4 years and a mean body mass index of 28.9 ± 5.8 kg/m2 (calculated as weight in kilograms divided by height in meters squared).Mean preoperative PVR was 25.8 ± 29.9 mL. Most participants had surgery that included a midurethral sling (137/160, 85.6%). Thirty-four (34/160, 21.3%) participants met criteria for postoperative urinary retention. The optimal recovery room TOV thresholds to predict postoperative urinary retention were PVR ≥87 mL (sensitivity 96.8%, specificity 60.0%), voided volume ≤ 150 mL (sensitivity 83.9%, specificity 72.3%), and sFOS ≤60% (sensitivity 100%, specificity 50.8%). Voided volume ≤ 150 mL had greater diagnostic accuracy than PVR ≥100 mL (156.2 vs 151.8).
Conclusions: In this cohort, PVR ≥87 mL, voided volume ≤ 150 mL, and sFOS ≤60% had optimal diagnostic accuracy for postoperative urinary retention.
Julia K. Shinnick, MD,* Christina A. Raker, ScD,† Elizabeth J. Geller, MD,‡ Charles R. Rardin, MD,* and Anne C. Cooper, MD, MA§
*Division of Female Pelvic Medicine and Reconstructive Surgery, Department of Obstetrics and Gynecology, Women & Infants Hospital of Rhode Island, Teaching Affiliate of the Warren Alpert Medical School of Brown University, Providence, RI; †Division of Research, Department of Obstetrics and Gynecology, Women & Infants Hospital of Rhode Island, Teaching Affiliate of the Warren Alpert Medical School of Brown University, Providence, RI; ‡Division of Urogynecology and Reconstructive Pelvic Surgery, Department of Obstetrics and Gynecology, University of North Carolina at Chapel Hill, Chapel Hill, NC; and §Division of Urogynecology, Department of Obstetrics & Gynecology, Dartmouth Geisel School of Medicine, Dartmouth, NH.
Source: Shinnick, et al. Comparison of Diagnostic Accuracies of Commonly Used Trial of Void Parameters. Urogynecology 2024;00:00–00 DOI: 10.1097/SPV.0000000000001539.