Normokalemic Periodic Paralysis

**Semantic type:** Disease or Syndrome

**Definition:** An autosomal dominant inherited non-dystrophic myotonia caused by mutations of the SCN4A gene, resulting in sodium muscle channelopathy. Currently, it is considered a variant of hyperkalemic periodic paralysis. Patients with normokalemic periodic paralysis do not have any change in their potassium levels during weakness, but become weak when they ingest potassium.

**Synonyms:** - NormoKPP