发作性运动障碍病(paroxysmal movement disorders)是一类少见的神经系统疾病,表现为突然且反复发作的异常运动,发作间期正常.它包括三种类型:(1)发作性异常运动(paroxysmal dyskinesias,PD ),分为发作性运动诱发的舞蹈手足徐动症(paroxysmal kinesigenic choreoathetosis,PKC),发作性肌张力异常的舞蹈手足徐动症(paroxysmal dystonic choreoathetosis,PDC),发作性持续运动诱发的肌张力障碍(paroxysmal exercise-induced dystonia,PED),夜间发作性肌张力障碍(nocturnal paroxysmal dystonia,NPD or hypnogenic paroxysmal dystonia,HPD)四类.(2)发作性共济失调(episodic ataxia,EA or paroxysmal ataxia,PA)Ⅰ型和Ⅱ型 .(3)发作性震颤(paroxysmal tremor,PT)[1,2].