Randomized controlled trial of variable-pressure versus fixed-pressure continuous positive airway pressure (CPAP) treatment for patients with obstructive sleep apnea/hypopnea syndrome (OSAHS).

Study Objective: To determine whether fixed-pressure or variable-pressure CPAP was preferred by patients and gave better outcomes in patients with the obstructive sleep apnea/hypopnea syndrome (OSAHS).

Design: Randomized blinded cross-over trial with 6 weeks of fixed and 6 weeks of variable-pressure CPAP.

Setting: Sleep center.