Polysomnography questions with correct answers

Polysomnogram CORRECT ANSWER Test records several body fuctions during sleep. Nasion CORRECT ANSWER Bridge of the nose Inion CORRECT ANSWER Occipital protuberance - most prominent point of the occipital bone Pre-auricular points CORRECT ANSWER In the front notches in the middle of each ear. EKG Artifact CORRECT ANSWER EKG waveform appearing in other channels EKG Artifact correction CORRECT ANSWER Moving the affected electrode(s). STAGE W (Wake) CORRECT ANSWER - high frequency pattern when eyes are open - occipital EEG's show alpha rhythm in 8-13Hz range when eyes are closed - Eye blinks may occur - large body movements are common -Chin EMG amplitude is high STAGE N1 CORRECT ANSWER - EEG's show a low voltage, mixed frequency pattern in the theta range of 4-7Hz - Vertex sharp waves (V waves) are comm