Comparison of repeatability of non-invasive and invasive urodynamics

Neurourology and Urodynamics
R van Mastrigt, J W N C Huang Foen Chung

Abstract

We have developed a method for the non-invasive measurement of urinary bladder pressure, and we apply this method in a longitudinal study of changes in bladder contractility in response to prostatic enlargement. In each volunteer in this study, we measure the bladder pressure twice. In the present study we have used this data to compare the repeatability of the non-invasive method to that of pressure-flow studies in a comparable population of patients. Difference plots were made of non-invasive bladder pressure measurements in 457 volunteers and of pressure-flow studies in a comparable population of 397 male patients. To compare the repeatability of two different methods for clinical measurement, the standard deviation of differences between repeated measurements in one individual needs to be normalised. Often a normalisation by dividing by the mean is done. We show that that normalisation may lead to erroneous results. We have normalised the standard deviations by dividing by the difference between the 97.5th and 2.5th percentile of the mean of the two observations in each subject. Normalised repeatability of the non-invasive method was 0.15, that of the various parameters derived from the pressure-flow studies varied from 0.1...Continue Reading

References

Jul 20, 1999·The Journal of Urology·B RikkenR van Mastrigt
Sep 24, 1999·Neurourology and Urodynamics·J J Pel, R van Mastrigt
Nov 9, 2000·Neurourology and Urodynamics·G S SonkeJ J de La Rosette

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Citations

Feb 14, 2006·Nature Clinical Practice. Urology·Vinay Kalsi, Clare J Fowler
Jul 14, 2005·Clinical Obstetrics and Gynecology·Kimberly Kenton, Elizabeth Mueller
Jun 2, 2005·Current Opinion in Urology·John P F A Heesakkers, Jessica L J Vriesema
Sep 18, 2008·Current Opinion in Obstetrics & Gynecology·Gouri B DiwadkarMarie Fidela R Paraiso
Nov 21, 2013·Current Opinion in Urology·Altaf Mangera, Christopher Chapple
May 27, 2009·Indian Journal of Urology : IJU : Journal of the Urological Society of India·Tim IdzengaRon van Mastrigt
May 27, 2009·Indian Journal of Urology : IJU : Journal of the Urological Society of India·R van MastrigtS de Zeeuw
Apr 20, 2014·Indian Journal of Urology : IJU : Journal of the Urological Society of India·Altaf MangeraChristopher R Chapple

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