Fig. 3
From: Distinct polysomnographic and ECG-spectrographic phenotypes embedded within obstructive sleep apnea
Patterns of sleep fragmentation phenotype based on sleep efficiency. The upper hypnogram shows rapid sleep-wake transitions from severe sleep apnea, while the lower hypnogram shows nearly the same sleep efficiency but with consolidated periods of wake separated by consolidated periods of sleep. The % N1 is markedly increased in the patient with rapid transitions (44.2%). Thus, individual phenotypes can mix and match. ROx: raw oximetry. EV: respiratory events. OxEv: Oximetry desaturation events. Hyp: sleep stage hypnogram