Abstract
We developed a condom-type catheter to non-invasively measure the bladder pressure during interruption of the flow rate. The aim of the present study was to establish a minimum flow rate value at which a reliable bladder pressure measurement can be made with this catheter. We reanalysed data from 43 patients who completed a pressure-flow study and a non-invasive test. The patients voided without straining. During the test, we simultaneously measured the bladder pressure (invasively) and the condom pressure (non-invasively). The pressure increase in the condom after interruption of the flow rate was analysed in 40 of the 43 patients. A plot of the difference between the bladder pressure and the maximum condom pressure as a function of the flow rate revealed that in 70% of the patients who voided with a maximum flow rate exceeding 5.4 ml/s, the condom pressure accurately reflected the bladder pressure (±14 cmH2O). We conclude that to accurately and non-invasively measure the bladder pressure with a condom-type catheter, the maximum flow rate should exceed 5.4 ml/s.
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Acknowledgements
This research was supported by the Technology Foundation STW, applied division of the Netherlands Organisation for Scientific Research (NWO) and the technology programme of the Ministry of Economic Affairs.
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Pel, J.J.M., van Mastrigt, R. A flow rate cut-off value as a criterion for the accurate non-invasive measurement of bladder pressure using a condom-type catheter. Urol Res 31, 177–182 (2003). https://doi.org/10.1007/s00240-003-0312-7
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DOI: https://doi.org/10.1007/s00240-003-0312-7