PSG QUESTIONS AND ANSWERS 2024

Sleep onset Start of the first epoch scored as any stage other than W Vertex sharp waves Sharply contoured. Duration of <0.5 seconds. Max over central regions. If a subject does not produce the alpha rhythm, how can you score N1? EEG activity in the range of 4-7 Hz with slowing background frequencies Vertex sharp waves Slow eye movements K complex Negative sharp wave followed by a positive component. Usually max in the frontal regions. Duration of greater than or equal to 0.5 seconds. What has to occur for an arousal to be associated with a K complex? The arousal must be congruent with the k complex or occur no more than 1 second after termination of the k complex. Sleep spindle 11-16 Hz (most commonly seen 12-14 Hz)