KCNA1 and hereditary continuous muscle fiber activity: Mutations in the KCNA1 gene encoding the Kv1.1 voltage‐gated potassium (K+) channel have been linked to episodic ataxia type 1 (EA1), a rare neurological syndrome characterized by continuous myokymia and attacks of generalized ataxia that can be triggered by fever, abrupt movements, emotional stress, and fatigue.