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HYPP stands for Hyperkalemic periodic paralysis - it is a dominant disease  Genetic Testing is Available


HYPP presents as
sporadic episodes of muscle spasms, weakness, or paralysis in affected horses exposed to high potassium levels. Respiratory paralysis or heart failure may lead to death. Episodes may be triggered by stress, diet, lack of exercise, and recovery from anesthesia. 

It has been  traced to the QH stallion Impressive (althought their is some controversy that it might have gone back further than that).  Treatment for episodes is usually done with Karo Syrup.

Homozygous HYPP horses (H/H) are often more symptomatic than n/H horses.


HYPP is one of the 5 panel fo tests required by all AQHA breeding stallions.

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