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Myotonia associated with hyperadrenocorticism in two dogs
G R Swinney1, S F Foster, D B Church
1Department of Veterinary Clinical Sciences, University of Sydney, New South Wales.
Australian Veterinary Journal
|December 23, 1998
Summary
Two dogs experienced stiffness due to hyperadrenocorticism, a condition affecting adrenal glands. Treatment varied, with one dog improving after steroid withdrawal and the other showing reduced myotonia with procainamide.
Area of Science:
- Veterinary Medicine
- Endocrinology
- Neurology
Background:
- Hyperadrenocorticism, a common endocrine disorder in dogs, can manifest with diverse clinical signs.
- Myotonia, a neuromuscular condition causing delayed muscle relaxation, has been rarely associated with hyperadrenocorticism.
Observation:
- Two dogs presented with disabling gait abnormalities characterized by muscle stiffness.
- These clinical signs were consistent with myotonia secondary to hyperadrenocorticism.
Findings:
- The first dog, with iatrogenic hyperadrenocorticism, showed significant improvement after gradual corticosteroid withdrawal.
- The second dog, diagnosed with pituitary-dependent hyperadrenocorticism, experienced progressive myotonia despite mitotane therapy.
- Procainamide administration successfully alleviated myotonic stiffness in the second dog.
Implications:
- This suggests a potential link between hyperadrenocorticism and myotonia in canine patients.
- Management strategies for myotonia secondary to hyperadrenocorticism may require individualized approaches.
- Further research is warranted to elucidate the underlying mechanisms and optimize treatment protocols.