Abstract
ABSTRACTIntroduction:The 24-hour bladder diary is considered to be the gold standard for evaluating maximum voided volume (MVV). However, we observed that patients often have a greater MVV during office uroflowmetry than that seen in the bladder diary. The purpose of this study is to compare these two non-invasive methods by which MVV can be determined - at the time of uroflowmetry (Q-MVV), or by 24hour bladder diary (BD-MVV).Materials and Methods:This was an Institutional Review Board approved retrospective study of patients evaluated for LUTS who completed a 24hour bladder diary and contemporaneous uroflowmetry. For Q-MVV, the patient was instructed to wait to void until their bladder felt full. Sample means were compared, and Pearson's correlations were calculated between the Q-MVV and BD-MVV data across the total sample, women, and men.Results:Seven hundred seventy one patients with LUTS completed bladder diaries. Of these, 400 patients, 205 women and 195 men, had contemporaneous Q-MVV. Mean BD-MVV was greater than mean Q-MVV. However, Q-MVV was larger in a sizable minority of patients. There was a weak correlation between BD-MVV and Q-MVV. Furthermore, there was a difference ≥50% between Q-MVV and BD-MVV in 165 patients (41%).Conclusions:The data suggest that there is a difference between the two measurement tools, and that the BD-MVV was greater than Q-MVV. For a more reliable assessment of MVV, this study suggests that both Q-MVV and BD-MVV should be assessed and that the larger of the two values is a more reliable assessment of MVV.
Highlights
The 24-hour bladder diary is considered to be the gold standard for evaluating maximum voided volume (MVV)
An alternative method to estimate MVV is during office uroflowmetry [6] when the patient is instructed to wait until the bladder feels full - the MVV obtained at the time of uroflow (Q-MVV) [11]
BD-MVV is the volume of largest void obtained during a 24-hour assessment period recorded independently by the patient in a 24-hour bladder diary via the smartphone application
Summary
The 24-hour bladder diary is considered to be the gold standard for evaluating maximum voided volume (MVV). The purpose of this study is to compare these two non-invasive methods by which MVV can be determined - at the time of uroflowmetry (Q-MVV), or by 24hour bladder diary (BD-MVV). Materials and Methods: This was an Institutional Review Board approved retrospective study of patients evaluated for LUTS who completed a 24hour bladder diary and contemporaneous uroflowmetry. Clinical guidelines for evaluation of LUTS in men and women require a focused history and physical examination. Both bladder diaries and uroflow are adjunctive tools that may be considered as part of the diagnostic evaluation [1, 2]. An alternative method to estimate MVV is during office uroflowmetry [6] when the patient is instructed to wait until the bladder feels full - the MVV obtained at the time of uroflow (Q-MVV) [11]
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