Positional patients are defined as obstructive sleep apnea(OSA) patients in whom respiratory disturbance index(RDI) or apnea-hypopnea index(AHI) is at least twice as high in the supine position than in the non-supine position.Positional therapy (the avoidance of the supine posture during sleep is a simple behavioral therapy for mild and moderate sleep disordered breathing.
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