A Case of Propriospinal Myoclonus at Sleep Onset

Received June 30, 2011 Revised October 11, 2011 Accepted October 11, 2011 Address for correspondence Sang-Ahm Lee, MD Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 138-736, Korea Tel: +82-2-3010-3440 Fax: +82-2-474-4691 E-mail: salee@amc.seoul.kr Propriospinal myoclnus is uncommon disorder characterized by arrhythmic jerk arising in muscles corresponding to a myelomere and spreading rostrally and caudally. Propriospinal myoclnus occurring only in the relaxation period preceding sleep was first described in 1997, and is extremely rare. Myoclonus showed a striking relationship with vigilance level. We report a case of propriospinal myoclnus at sleep onset with a polysomnographic and electromyographic studies, who is the first case in Korea to the best of our knowledge. J Korean Sleep Res Soc 2011;8:48-51