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[Reliability of pressure measures determined with probes used for establishing the urethral pressure profile by the
L Le Normand1, P Glemain, J P Cordonnier
1Clinique Urologique, CHU Nantes.
Abstract:
The objective of this study was to evaluate the reliability of pressure measurements by the main catheters used to determine urethral profiles by the perfusion method. This evaluation, performed on a test bench, compared the reference pressure in a tank filled with water to that measured by the catheter tested. The reliability of the measurement varied from one catheter to another. This disparity was due to differences of load losses, leading to an overestimation of the measurement (by 2 to 17 centimetres of water), which must be corrected by adjustment of the zero pressure with a perfused catheter. Major differences in the rapidity of response (from zero to five seconds) were also observed, which appear to be related to elastic properties of the catheter. This study does not pretend to globally verify the reliability of the perfusion method, but only the reliability of pressure measurements.