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- Title
Measurement of bladder compliance can be standardized by a dimensionless number: clinical perspective.
- Authors
Wahl, Edward F.; Lerman, Steven E.; Lahdes-Vasama, Tuija T.; Churchill, Bernard M.
- Abstract
To devise a new, practical and more accurate method for measuring bladder compliance, and to show that traditional estimates of compliance are impractical.Childhood bladder capacity varies greatly with age while detrusor pressure in a normal bladder does not. Consequently, traditional bladder compliance (ΔV/ΔP) increases with age, i.e. maturation. Therefore we devised a standard method that includes normal values of pressures and volumes to calculate and report bladder compliance in children, and that also applies to adults. A dimensionless number (NWahl−1) was computed for standardizing bladder compliance, comparing the normalized capacity to normalized pressure by the ratio (ΔV/Vcap,NL)/(ΔP/Pcap,NL), whereΔP is the pressure at bladder capacity,ΔV the volume at bladder capacity, Vcap,NL the volume at mean expected bladder capacity and Pcap,NL the pressure at mean expected bladder capacity. Vcap,NL is obtained from nomograms of published data.The bladder compliance of patients undergoing urodynamic testing was calculated using NWahl−1 and the traditional equation (ΔV/ΔP). NWahl−1 provided a more accurate diagnosis and therefore was of more practical use.Bladder compliance depends on patient age, sex and size; the new estimate used to standardize bladder compliance is based on these factors and is a dimensionless number. This may help when comparing patients and assessing outcomes.
- Subjects
BLADDER; VOLUMETRIC analysis; PATIENTS; CLINICAL chemistry; THERAPEUTICS; UROLOGY; BLADDER diseases
- Publication
BJU International, 2004, Vol 94, Issue 6, p898
- ISSN
1464-4096
- Publication type
Article
- DOI
10.1111/j.1464-410X.2004.05055.x