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Equine hyperkalemic periodic paralysis: review and implications
1Department of Veterinary Internal Medicine, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon.
Summary
Equine hyperkalemic periodic paralysis stems from a genetic mutation affecting skeletal muscle sodium channels. This review summarizes its signs, diagnosis, and treatment, highlighting the need for awareness among practitioners.
Area of Science:
- Veterinary Medicine
- Equine Genetics
- Neuromuscular Disorders
Background:
- Equine hyperkalemic periodic paralysis (HYPP) is a genetic disorder affecting skeletal muscle sodium channels.
- It is inherited as an autosomal dominant trait, with most affected horses being heterozygotes.
Purpose of the Study:
- To provide an updated review of equine hyperkalemic periodic paralysis (HYPP).
- To summarize the clinical signs, diagnostic methods, treatment options, and implications of HYPP.
Main Methods:
- Comprehensive literature review of original articles published between 1986 and early 1993.
- Synthesis of information on the genetic basis, clinical presentation, and management of HYPP.
Main Results:
- HYPP is caused by a mutation in the skeletal muscle sodium channel gene.
- Classical signs like muscle fasciculation and weakness are rarely observed; sequelae include abrasions and recumbency.
- Homozygotes may exhibit more severe symptoms, including upper respiratory obstruction in foals.
Conclusions:
- Practitioners require knowledge of HYPP diagnostic tests and their limitations for accurate diagnosis.
- The equine industry faces challenges regarding mandatory testing and the management of HYPP-positive horses.