Study Status: Completed
Recruit Status: Unknown status
Study Type: Observational
Official Title: Observation of the Abnormal Potential From the Offending Vessel to the Facial Muscles of Hemifacial Spasm Patients
Brief Summary: The pathophysiologic basis of hemifacial spasm is cross-transmission between different branches of the facial nerve. The hypothesis is that the cross-transmission is mediated by the sympathetic nerve fibers on the surface of the offending artery. The abnormal potential from the offending vessel to the facial muscles will be detected on hemifacial spasm patients, so as to determine if the sympathetic nerve fibers take part in the circuit of cross-transmission.