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Urologic changes after cauda equina compression in dogs.
D R Bodner1, R B Delamarter, H H Bohlman
1Division of Urology, Case Western Reserve University School of Medicine, Cleveland, Ohio.
The Journal of Urology
|January 1, 1990
Summary
Severe cauda equina compression in dogs led to significant neurological deficits. Higher compression levels (75%) resulted in complete bladder dysfunction and severe axonal loss, impacting spinal cord function.
Area of Science:
- Veterinary Neurology
- Comparative Pathology
- Spinal Cord Research
Background:
- Cauda equina syndrome (CES) affects spinal cord function.
- Understanding CES progression is crucial for treatment development.
- Previous studies lack detailed analysis of varying compression degrees.
Purpose of the Study:
- To investigate the functional and histological effects of graded cauda equina compression.
- To correlate compression severity with neurological deficits and physiological changes.
- To establish a canine model for studying CES.
Main Methods:
- Surgical implantation of a constricting loop in beagle hounds (n=18).
- Graded compression (25%, 50%, 75%) at the L7 level, confirmed by MRI/CT.
- Neurological evaluation, cystometry, cortical evoked potentials (CEPs), and histopathology.
Main Results:
- 75% compression caused flatlined cystometric tracings, indicating bladder dysfunction.
- CEPs showed increased latency with higher compression: 3.2% (25%), 7.8% (50%), 17.2% (75%).
- Histopathology revealed axonal loss and root atrophy, escalating with compression severity.
Conclusions:
- Graded cauda equina compression induces dose-dependent neurological and histological damage.
- Significant functional deficits, including bladder dysfunction, occur with severe compression.
- This model provides valuable insights into CES pathophysiology and potential therapeutic targets.