paroxysmal nonkinesigenic dyskinesiaparoxysmal hypnogenic dyskinesiachronic paroxysmal hemicraniaepisodic paroxysmal hemicraniaparoxysmal atrial tachycardia causesparoxysmal hemicrania continuaparoxysmal dyskinesia dogpheochromocytoma paroxysmparoxysmal hypertensionparoxysmal fibrillationparoxysmal nocturnal diseasedefine paroxysmal