Fig. 2
From: Severe restless legs syndrome in a family with Alport syndrome
Five minutes polysomnographic sample of NREM sleep showing a sequence of periodic limb movements during sleep (grey background), recorded by surface electromyography of both left and right tibialis anterior muscles (LTA, RTA). Cortical arousals coupled with motor events visible at electroencephalic channels. F3 and F4 frontal left and right; C3 and C4 central left and right; O2 occipital right; A1 and A2 mastoid left and right; EOG = electrooculogram; Chin = electromyography of submentalis muscle; EKG = electrocardiogram; ONF = oro-nasal flow; TM = thoracic movements; AM = abdominal movements