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Comparison of flowrates and voided volumes during non‐instrumented uroflowmetry and pressure‐flow studies in women with stress incontinence
Author(s) -
Mueller Elizabeth R.,
Litman Heather,
Rickey Leslie R.,
Sirls Larry,
Norton Peggy,
Wilson Tracey,
Moalli Pamela,
Albo Michael,
Zimmern Philippe
Publication year - 2015
Publication title -
neurourology and urodynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 90
eISSN - 1520-6777
pISSN - 0733-2467
DOI - 10.1002/nau.22625
Subject(s) - medicine , nomogram , urinary incontinence , urinary flow , urology , prostate , cancer
Aims The Blaivas–Groutz nomogram defines voiding obstruction in women using Q max from the NIF and the maximum detrusor pressure (P detmax ) from the PFS. The aim of this study was to understand the relationship between NIF and PFS maximum flow rates in women with stress incontinence. Methods We analyzed the UDS of 597 women with stress‐dominant urinary incontinence. Each subject underwent a NIF and then a PFS. Mixed model was used to test the hypothesis that the relationship between flow rates and voided volume (VV) were similar for NIF and PFS. Results There were 452 subjects with both NIF and PFS studies that met the inclusion criteria and had max flow rate (Q max ) for both NIF and PFS. The mean age was 53. Overall, higher VV were observed during PFS compared to NIF and subjects had higher Q max with NIF compared to PFS. The relationship between Q max and VV was significantly different between NIF and PFS ( P < 0.004). At 200 ml, NIF Q max was 14% higher than PFS Q max and this difference increased to 30% at 700 ml. Conclusion The difference between PFS Q max and NIF Q max increases as VV increase. As a result, values from PFS and NIF cannot be used interchangeably as has been suggested in the Blaivas–Groutz nomogram for obstruction in women. Neurourol. Urodynam. 34:549–553, 2015 . © 2014 Wiley Periodicals, Inc.