Related Experiment Videos
Repeat noninvasive bladder pressure measurements with an external catheter
B Rikken1, J J Pel, R van Mastrigt
1Department of Urology-Urodynamics, Erasmus University Rotterdam, The Netherlands.
The Journal of Urology
|July 20, 1999
Summary
A new noninvasive method accurately measures isovolumetric bladder pressure, crucial for diagnosing infravesical obstruction. This technique allows for repeat measurements, enabling a reliable, noninvasive diagnosis of bladder outlet obstruction.
Area of Science:
- Urology
- Medical Devices
- Diagnostic Technology
Background:
- Objective diagnosis of infravesical obstruction typically combines maximum flow rate and isovolumetric bladder pressure.
- A noninvasive method for measuring isovolumetric bladder pressure is needed to develop a noninvasive diagnostic modality.
Purpose of the Study:
- To evaluate a noninvasive method for measuring isovolumetric bladder pressure.
- To assess the feasibility of developing a noninvasive diagnostic tool for infravesical obstruction.
Main Methods:
- An external catheter system with a pressure transducer was employed.
- Voiding flow rate was measured, and the flow was temporarily interrupted to record bladder pressure.
- Measurements were conducted on 11 healthy male volunteers in two series to assess voiding impact and pressure-volume dependence.
Main Results:
- Interruption of flow rate did not affect voiding.
- Isovolumetric bladder pressure showed a significant dependence on bladder volume.
- Average maximum isovolumetric pressure was 12.2 kPa at a bladder volume of 251 ml.
Conclusions:
- Repeat noninvasive measurements of isovolumetric bladder pressure are feasible without inhibiting voiding.
- Considering the pressure-volume relationship allows for a reliable pressure estimate.
- This method provides a basis for a noninvasive diagnosis of infravesical obstruction.