Polysomnography study Exam questions with correct answers

Bruxism Scoring CORRECT ANSWER 1. May consist of brief or sustained elevations of chin EMG activity at least twice the amplitude of background EMG. 2) 0.25 - 2 seconds in duration and if at least 3 elevations in a regular sequece. 3) sustained elevations of chin EMG if more than 2 seconds. 4) 3 seconds of stable background before new episode can be scored 5) It can be scored with a min of 2 audible tooth grinding (in absence of epilepsy) EFM (Excessive Fragmentary Myoclonus) CORRECT ANSWER 1) usual max EMG burst duration is 150 msec. 2) at least 20 min of NREM sleep with EFM must be recorded 3) 5 EMG potentials per min must be recorded HFT (Hyphagogic Foot Tremor) CORRECT ANSWER 1) Train in HFT series (min) is 4 2) min frequency is 0.3Hz 3) max frequency is 4.0Hz ALMA (Alternating Leg Muscle Activation) CORRECT ANSWER 1) minimum # of alternating EMG activity in a series is 4 2) min frequency of 0.5Hz 3) max frequency of 3.0Hz PIM Series CORRECT ANSWER 1) 4LM (leg movement) in a row 2) min time between LM to be part of series is 5 seconds 3) max time between LM to be part of series is 90 seconds 4)LM on 2 different legs separated by less than 5 second