Abstract
Recently, the periodic paralysis has been supposed to be a clinical syndrom, because it includes several kinds of etiologically different muscle paralysis on the extremities.
As the mechanism of this paralytic attack, it was reasonable to presume that the diff erance of potassium concentration between intracellular and extracelluar space in muscle influenced strongly on resting membrane potential of the cells. Many of the idiopathic cases reported previously were accompanied by hypokalemia.
A peculiar case with the periodic paralysis in male of 30 was presented. The characteristic features in this case were non-f omilial occurrence, normokalemia and euthyroidism. So far as our studies are concerned, this may be a case of so-called normokalemic periodic paralysis.
