Objective To investigate daytime and nighttime variation of heart rate variability(HRV)in patients with obstructive sleep apnea syndrome(OSAS), and to evaluate the screening capacity of HRV.

目的研究阻塞性睡眠呼吸暂停综合征（OSAS）患者心率变异性（HRV）昼夜变化，探讨利用HRV指标筛选OSAS的效果。

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