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Related Experiment Video

Updated: Jun 29, 2026

The Use of Cystometry in Small Rodents: A Study of Bladder Chemosensation

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Published on: August 21, 2012

Decrease in intravesical saline volume during isovolumetric cystometry in the rat

K Sugaya¹, Y Ogawa, O Nishizawa

¹Department of Urology, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan.

Neurourology and Urodynamics

|January 1, 1997

Summary

Intravesical saline is absorbed by the rat bladder when volumes exceed 0.6 ml, a threshold linked to the micturition reflex. This absorption, measured during isovolumetric cystometry, highlights bladder wall permeability.

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Area of Science:

Urology
Physiology

Background:

The bladder's capacity to absorb fluid is crucial for maintaining urinary homeostasis.
Understanding fluid dynamics within the bladder is essential for diagnosing and treating bladder dysfunction.

Purpose of the Study:

To investigate the absorption of intravesical saline in female rats during isovolumetric cystometry.
To determine the relationship between initial saline volume and the rate of absorption.

Main Methods:

Ureteral transection and ligation, followed by urethral ligation to create a closed bladder system.
Isovolumetric cystometry was performed on urethane-anesthetized female rats, filling the bladder with varying volumes of saline or soybean oil.
Bladder neck ligation was employed in some rats to assess the impact on blood flow and absorption.

Main Results:

Intravesical saline volume decreased significantly (4-79%) when initial volumes were ≥ 0.6 ml, indicating absorption.
The percentage change in saline volume was dependent on the initial volume, described by the equation y = -42x + 17.
No significant volume change was observed when the bladder was filled with soybean oil, suggesting specific saline absorption.
Absorption was reduced when the bladder neck was ligated, implying a role for blood flow.

Conclusions:

The normal bladder wall absorbs intravesical saline when the volume exceeds 0.6 ml.
This absorption threshold appears related to the volume required to elicit the micturition reflex.
The findings provide insights into bladder fluid dynamics and potential mechanisms of absorption.