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. Author manuscript; available in PMC: 2010 Jan 29.
Published in final edited form as: Chest. 2007 Jul;132(1):325. doi: 10.1378/chest.07-0040

Figure 3.

Figure 3

A summary hypnogram and oximetry tracing in a patient with severe OSA (AHI, 84/h). Note the relatively infrequent transitions to lighter stages of sleep in the setting of severe oxyhemoglobin desaturations (Desat) [as low as 70%]. An expanded view of the sleep study is present in the lower panel. In the tracing, three obstructive apneas in association with oxyhemoglobin desaturation (pulse oximetry saturation range [SpO2], 70 to 100%) and arousals (indicated by arrows over the EEG tracing; see text for additional details). SmEMG = submental electromyogram.