Figure 4. Mild supine predominant obstructive sleep apnea.

This patient spent the majority of the night within ± 15 degrees of supine; other significant portions of the night were between 270–300 degrees (supine of left lateral) and between 60–90 degrees (right lateral). While the patient has an overall apnea-hypopnea index (AHI) of 7.5 events/h, when the patient is in the supine position range, the posture specific AHI is predominantly in the moderate range of 15–25 events/h. With the available postural data, we can infer that with torso rotation of 60 degrees or more from supine, the position specific AHI reduces to 0–5 events/h. As such, positional therapy to prevent sleeping postures within ± 60 degrees of supine could potentially control this individual’s sleep apnea. The presence of significant periods of lateral sleep in the observational study indicates that this individual is likely to be able to tolerate a postural therapy.