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目的:探讨重度阻塞性睡眠呼吸暂停综合征（OSAS）患者脉氧下降率与血压的相关性及可能机制。方法:入选2018年3月至2019年1月就诊于南京医科大学附属淮安第一医院睡眠医学中心打鼾患者，对其进行多导睡眠图（PSG）监测，同步行整夜连续无创血压及心率变异性监测。根据PSG结果以及排除标准共纳入重度OSAS患者86例。将受试者按照门诊血压测量值分为高血压组（44例）及血压正常组（42例）。分析在呼吸暂停事件发生后，氧减事件中每秒脉搏血氧饱和度（SpOn 2）下降的百分比作为脉氧下降率。比较两组睡眠监测相关指标，使用多元回归方程进行统计学分析探讨脉氧下降率与血压的关系及可能机制。n 结果:高血压组的呼吸暂停低通气指数（AHI）和呼吸相关微觉醒指数（RERAs）均显著高于血压正常组［（69.8±18.2）比（56.5±13.9）次/h；（40.5±17.4）比（30.2±14.6）次/h］（均n P<0.01）。另外，高血压组低氧暴露较血压正常组更为严重，尤其是脉氧下降率［（0.45±0.14）%/s比（0.33±0.10）%/s，n P<0.001］。回归方程显示在排除年龄、性别、颈围、腹围、吸烟、饮酒影响因素后，仅有脉氧下降率与OSAS患者日间、夜间血压水平存在相关性（n β=0.473、0.478，均n P<0.01），相关性方程提示脉氧下降率与日间、夜间交感-副交感失衡有关（n r=0.367、0.337，均n P<0.01）。n 结论:重度OSAS患者的脉氧下降率与血压水平密切相关，而潜在的机制可能是交感神经兴奋性增加所致“,”Objective:To investigate the association between oxygen desaturation rate and blood pressure (BP) among severe obstructive sleep apnea syndrome (OSAS) and the possible mechanism.Methods:Patients with snoring were enrolled from the Department of Sleep Medicine Center, the Affiliated Huaian No.1 People′s Hospital of Nanjing Medical University form March 2018 to January 2019 and underwent polysomnography (PSG). Noninvasive BP and Heart rate variability were full-night monitored continuously and synchronized with PSG. Based on the PSG results and exclusion criteria, a total of 86 severe OSAS patients were enrolled in this study and divided into two groups according to the ambulatory BP measurements: hypertensive group (n n=44) and normotensive group (n n=42). Oxygen desaturation rate was expressed as the change in the percentage of pulse oxyhemoglobin saturation (SpOn 2) per second during desaturation events after the obstructive apnea events occurred. The PSG parameters were compared between the two group and the multiple regression analyses were used to explore the association between oxygen desaturation rate and BP and its possible mechanism.n Results:The apnea-hyperpnoea index (AHI) and respiratory event-related arousals (RERAs) were significantly higher in hypertensive group than those in normotensive group [(69.8±18.2) n vs. (56.5±13.9) event/h; (40.5±17.4) n vs. (30.2±14.6) event/h, both n P<0.01]. In addition, hypoxia exposure conditions in the hypertensive group were more severe than those in the normotensive group, especially oxygen desaturation rate [(0.45±0.14)%/sn vs. (0.33±0.10)%/s, n P<0.001]. After adjusting for age, sex, neck circumference, waist circumference, smoking, drinking, the regression analyses showed that only the oxygen desaturation rate was significantly associated with both awake and asleep BP in OSAS patients (n β=0.473, 0.478, bothn P<0.01) and the correlation analyses suggested that the oxygen desaturation rate was related to the both awake and asleep sympathetic-parasympathetic imbalance (n r=0.367, 0.337, both n P<0.01).n Conclusion:Oxygen desaturation rate is closely related to BP levels in patients with severe OSAS, and the underlying mechanism is associated with the increased sympathetic activity.