Improvement of sleep structure in patients with obstructive sleep apnea hypopnea syndrome treated by auto-continuous positive airway pressure

[Objective] To observe the efficiency of auto-continuous positive ai rway pressure(Auto-CPAP) treatment in patients with obstructive sleep apnea hypo pnea syndrome(OSAHS). And to investigate the influence of sleep structure in OSA HS patients treated by AUTO-CPAP. [Methods] The polysomnography (PSG) were tak en in 28 patients with OSAHS untreated previously. Their parameters of PSG obtai ned before and during the AUTO-CPAP treatment were analyzed. [Results] During the AUTO-CPAP treatment the longest apnea time had been shorten (25±12.9) s vs. (57.6±18.3) s, P 0.001. Apnea Hypopnea Index(AHI) had been decreased(8.0±8.7 )/h vs. (54.4±22.7)/h, P 0.001. The lowest oxygen saturation had been raised ( 83.7±6.5) % vs. (66.0±12.1) %, P 0.001. And the average oxygen saturation imp roved too (93.6±2.2)% vs. (86.5±6.8)%, P 0.001). The deep sleep (sleep stage 3 and 4) improved (11.4±5.4)% vs. (5.4±8.0), P 0.01. Microarousle Index (MAI ) decreased from (31.5±19.5)/h to (8.3±5.1)/h (P 0.001). Sleep efficiency get a little lower (85.0±11.8) % vs. (89.8±9.1) %, P 0.05. [Conclusions] Auto- CPAP can improve the sleep apnea/hypopnea and noctural oxygendesaturation. The s leep quality of OSAHS patients improved too during treating.