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A new technique for dynamic analysis of bladder compliance
R F Gilmour1, B M Churchill, R E Steckler
1Division of Urology, Department of Surgery, Hospital for Sick Children, Toronto, Ontario, Canada.
The Journal of Urology
|October 1, 1993
Summary
We introduce dynamic compliance analysis, a new method for measuring bladder filling compliance. This technique provides more detailed bladder response information than traditional methods, aiding clinical assessment.
Area of Science:
- Urology
- Biomedical Engineering
- Physiology
Background:
- Bladder compliance measurement is crucial for assessing bladder function.
- Traditional methods may not fully capture the dynamic changes during bladder filling.
- Understanding bladder mechanics is essential for diagnosing and managing lower urinary tract conditions.
Purpose of the Study:
- To introduce and describe a novel method for measuring bladder compliance: dynamic compliance analysis.
- To evaluate the clinical applicability and predictability of this new technique.
- To compare the information yielded by dynamic compliance analysis with traditional methods.
Main Methods:
- Digitizing cystometrogram curves at 2 samples/second using an MS-DOS computer.
- Developing a program to analyze subtracted bladder pressure and calculate instantaneous compliance.
- Plotting instantaneous compliance against the percentage of total infused volume.
- Analyzing 63 cystometrogram curves from clinically normal patients.
Main Results:
- Dynamic compliance analysis yielded predictable results in normal subjects.
- The minimum dynamic compliance value in normal individuals was consistently above 10 ml/cm water during phase 2 (tonus limb) of the cystometrogram.
- The technique allowed for compliance values to be calculated every half second.
Conclusions:
- Dynamic compliance analysis offers a more comprehensive understanding of bladder response during filling.
- This method provides insights analogous to stress-strain curves used in solid mechanics.
- The technique demonstrates clinical applicability and potential for enhanced diagnostic capabilities in urology.