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Localized contractions in the normal human bladder and in urinary urgency
Marcus J Drake1, Ian J Harvey, James I Gillespie
1School of Surgical and Reproductive Sciences, University of Newcastle upon Tyne, UK. m.j.drake@ncl.ac.uk
BJU International
|April 21, 2005
Summary
Localized bladder activity, detected by micromotion detection (MMD), was more prevalent and sustained in women with increased bladder sensation. This suggests localized bladder wall distortions may stimulate afferent activity, potentially indicating a modular detrusor function.
Area of Science:
- Urology
- Physiology
- Neuroscience
Background:
- Bladder sensation is crucial for normal function.
- The generation of bladder sensory information is linked to afferent stimulation and bladder wall tension.
- Localized, multifocal autonomous bladder activity is observed in other species.
Purpose of the Study:
- To investigate localized activity in the normal human bladder.
- To determine if localized bladder activity correlates with reported sensations.
Main Methods:
- Observational study comparing 14 women with increased bladder sensation to 6 asymptomatic volunteers.
- Utilized the micromotion detection (MMD) method with electrodes on a Silastic balloon to record localized bladder wall displacements.
- Assessed localized bladder activity during filling cystometry.
Main Results:
- Localized bladder activity (micromotions) was observed in the ventral bladder portion of some volunteers.
- Women with increased bladder sensation showed a significantly higher prevalence and more sustained, higher-frequency localized activity than controls.
- Urinary urgency in symptomatic women strongly correlated with localized contractile activity, more so than with detrusor pressure changes.
Conclusions:
- A significant difference in localized bladder activity was found between symptomatic and asymptomatic groups, unlike conventional urodynamic studies.
- The exaggerated localized contractions in symptomatic women corresponded with their reported sensations.
- Findings suggest localized bladder wall distortion stimulates afferent activity and supports the concept of a functionally modular human detrusor.