MP02-15 THE VOIDING FREQUENCY INDEX AND FUNCTIONAL BLADDER CAPACITY INDEX: TWO NEW INDICES DERIVED FROM BLADDER DIARIES

Abstract

You have accessJournal of UrologyUrodynamics/Lower Urinary Tract Dysfunction/Female Pelvic Medicine: Non-neurogenic Voiding Dysfunction I (MP02)1 Sep 2021MP02-15 THE VOIDING FREQUENCY INDEX AND FUNCTIONAL BLADDER CAPACITY INDEX: TWO NEW INDICES DERIVED FROM BLADDER DIARIES Kevin Rychik, Max Edeson, Jeffrey Weiss, Wade Bushman, and Jerry Blaivas Kevin RychikKevin Rychik More articles by this author , Max EdesonMax Edeson More articles by this author , Jeffrey WeissJeffrey Weiss More articles by this author , Wade BushmanWade Bushman More articles by this author , and Jerry BlaivasJerry Blaivas More articles by this author View All Author Informationhttps://doi.org/10.1097/JU.0000000000001963.15AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract INTRODUCTION AND OBJECTIVE: The functional bladder capacity (FBC) is the largest voided volume recorded in a bladder diary. We define the minimum number of times a person must void based on their FBC and their 24-hour urine output as the voiding frequency index (VFI). We define the number of “extra voids”, the difference between the actual number of voids in 24 hours and the VFI, as the functional bladder capacity index (FBCI). The purpose of this study was to describe the normal and mean values for persons without LUTS and to evaluate how these values differ over the spectrum of lower urinary tract disorders. METHODS: This is a retrospective study of 511 patients with LUTS who completed a 24-hour bladder diary (BD) and lower urinary tract symptom score (LUTSS) questionnaire using a smartphone app* from 2015-2019. From the BD, we extracted the 24-hour voided volume (24HVV), FBC, as expressed by the maximum voided volume (MVV), and actual number of voids (ANV). Based on the LUTSS, patients were placed into 4 subgroups; overactive bladder (OAB), incontinence, nocturia and voiding dysfunction. Exclusion criteria included incomplete or inaccurate bladder diary or LUTSS entries. VFI was calculated as the ratio between the 24HVV and the FBC. FBCI was calculated by subtracting the VFI from the ANV. LUTS subgroup assignments were made based on the LUTSS questionnaire. These included OAB, urinary incontinence, nocturia and voiding dysfunction. Comparisons were made to calculate normative indices from previously published data sets. *weShare® URO from Symptelligence.com RESULTS: A total 487 patients provided adequate BD data for analysis (table 1). Larger FBCI as compared to normative values were found in patients with OAB, incontinence, and nocturia. CONCLUSIONS: FBCI is a quantitative metric for the “extra voids” in a 24-hour period. Our observations validate a commonly recognized pattern among patients with LUTS; voiding before feeling full in order to avoid being caught in a social or public situation where a bathroom is not available (anticipatory voids). Empirically, the larger the FBCI, the greater the likelihood a patient voids because of reasons unrelated related to functional bladder capacity. This metric may be useful in studies to quantitate the effect of behavior in evaluation and treatment of LUTS and prompting research into why people void as often as they do. Source of Funding: Institute for Bladder & Prostate Research © 2021 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 206Issue Supplement 3September 2021Page: e17-e17 Advertisement Copyright & Permissions© 2021 by American Urological Association Education and Research, Inc.MetricsAuthor Information Kevin Rychik More articles by this author Max Edeson More articles by this author Jeffrey Weiss More articles by this author Wade Bushman More articles by this author Jerry Blaivas More articles by this author Expand All Advertisement Loading ...