Cystometry

Cystometry

Cystometry is a clinical procedure that involves measuring the pressure within the bladder and abdomen, as well as the volume of fluid pumped into the bladder by a peristaltic pump. This is typically done using a catheter inserted through the urethra or a needle through the wall of the bladder. Cystometry is often combined with uroflowmetry to assess bladder function.From: A custom made interface to integrate recording of pulse rate and blood pressure during urodynamics investigations [2018], Medical Physics and Biomedical Engineering [2017]

Chapter 2 Biofluid Mechanics

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Published in B H Brown, R H Smallwood, D C Barber, P V Lawford, D R Hose, Medical Physics and Biomedical Engineering, 2017

B H Brown

Clinically we might measure these pressures using a catheter inserted through the urethra or a needle through the wall of the bladder (cystometry). As physicists we might devise very simple techniques based on principles such as energy conservation. The dynamics of urination present some very interesting problems in the analysis of collapsible elastic tubes, extending into the range of sonic or critically choked flows.

A custom made interface to integrate recording of pulse rate and blood pressure during urodynamics investigations

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Published in Journal of Medical Engineering & Technology, 2018

Ian J. S. Boddy, Simon Fulford, Charlotte R. Kemp

The urodynamics equipment is routinely used to perform two investigations; uroflowmetry and filling and voiding cystometry. Uroflowmetry is used to assess the patient’s ability to empty their bladder by measuring the mass of voided fluid as a proxy for volume and calculating the flow rate through Δ mass/Δ time. Filling and voiding cystometry combines uroflowmetry with measurement of pressure within the bladder (intra-vesical) and the abdomen (intra-abdominal), as well as the volume of fluid pumped into the bladder by the peristaltic pump. In addition to the measured data set, an additional pressure resulting from bladder muscle activity (detrusor pressure) is calculated by deducting the intra-abdominal pressure from the intra-vesical pressure. This test configuration leaves two pressure transducer inputs free to allow for the acquisition of additional signals.

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Chapter 2 Biofluid Mechanics

A custom made interface to integrate recording of pulse rate and blood pressure during urodynamics investigations