What causes hyperkalemic period paralysis (HYPP)?

Updated: Apr 09, 2020
  • Author: Eleanor Lederer, MD, FASN; Chief Editor: Vecihi Batuman, MD, FASN  more...
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HYPP is caused by mutations in the SCN4A gene and is inherited in an autosomal dominant manner. During attacks (which can be precipitated by administration of potassium), individuals with HYPP have flaccid generalized weakness and increased serum potassium levels. In addition, patients with HYPP can also have myotonia, which is not typically a feature of hypokalemic periodic paralysis (HOKPP). A number of similar disorders involving myotonia or muscular weakness are allelic to HYPP. [45]

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