This article is about the disease in humans. For the disease in equines, see Hyperkalemic periodic paralysis (equine).
Medical condition
Hyperkalemic periodic paralysis
Other names
Gamstorp episodic adynamy
Specialty
Neurology
Hyperkalemic periodic paralysis (HYPP, HyperKPP) is an inherited autosomal dominant disorder that affects sodium channels in muscle cells and the ability to regulate potassium levels in the blood. It is characterized by muscle hyperexcitability or weakness which, exacerbated by potassium, heat or cold, can lead to uncontrolled shaking followed by paralysis. Onset usually occurs in early childhood, but it still occurs with adults.
The mutation causing this disorder is autosomal dominant on the SCN4A gene with linkage to the sodium channel expressed in muscle. The mutation causes single amino acid changes in parts of the channel which are important for inactivation. These mutations impair "ball and chain" fast inactivation of SCN4A following an action potential.
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