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Electrovesicogram in the neurogenic bladder

¹Department of Surgery & Research, Faculty of Medicine, Cairo University, Egypt.

Journal of Investigative Surgery : the Official Journal of the Academy of Surgical Research

|November 1, 1996

Summary

Electrovesicography (EVG) effectively distinguishes spinal cord injury types by analyzing bladder electrical activity. It identifies normal patterns, dysrhythmic activity in upper motor neuron lesions, and silent signals in lower motor neuron lesions.

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Area of Science:

Neuroscience
Urology
Biomedical Engineering

Background:

Spinal cord injury (SCI) significantly impacts bladder function.
Accurate diagnosis of upper (UMNL) and lower (LMNL) motor neuron lesions is crucial for patient management.
Noninvasive diagnostic tools for bladder dysfunction are needed.

Purpose of the Study:

To evaluate the utility of electrovesicography (EVG) in differentiating bladder dysfunction in patients with SCI.
To characterize the EVG patterns associated with UMNL and LMNL.

Main Methods:

Electrovesicogram (EVG) recordings were performed on 24 SCI patients (15 UMNL, 9 LMNL) and 8 healthy controls.
Transcutaneous recordings were obtained with both full and empty bladders using supra-pubic electrodes.
Analysis focused on pacesetter potentials (PPs) rhythm, amplitude, and frequency.

Main Results:

Healthy controls exhibited regular, reproducible triphasic PPs.
UMNL patients displayed dysrhythmic EVG patterns (irregular rhythm, amplitude, frequency).
LMNL patients showed a "silent" EVG, indicating absent electrical activity.

Conclusions:

EVG is a simple, noninvasive tool for diagnosing bladder dysfunction in SCI.
Distinct EVG patterns correlate with UMNL and LMNL, aiding differential diagnosis.
EVG offers a promising, complication-free method for assessing vesical electric activity.

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