Familial Hyperkalæmic Periodic Paralysis

Abstract

Summary Two cases of familial hyperkalæmic periodic paralysis (adynamia episodica hereditaria) are described. Attacks of weakness were precipitated in each case by the oral administration of potassium. Mild myotonia was present in one case, but striking in the other. The clinical, biochemical and electromyographic features of the patients are described. Some of the literature is reviewed.