慢性心力衰竭患者波浪呼吸的平均幅度和周期时长与运动能力的关系*

目的: 探讨心衰患者（CHF）波浪呼吸的周期长度、振幅与运动能力的关系。方法: 237例心力衰竭患者进行症状限制性极限心肺运动试验（CPET）。将CPET每次呼吸的原始数据每秒切割,再进行单位时间的平均计算、分析。波浪式呼吸（OB）定义为CPET期间连续3次及其以上的呼吸波动,其中分钟通气量（VE）波动幅度超过同期均值的25%。存在OB的CHF患者（OB+）根据其峰值摄氧量（Peak VO₂）分为3个亚组。第1亚组（轻度CHF）Peak VO₂≥16 ml/（min·kg）,第2亚组（中度CHF）Peak VO₂为12~16 ml/（min·kg）,第3亚组（重度CHF）Peak VO₂≤12 ml/（min·kg）。结果: 237例CHF患者中,78例OB+患者（32.6%）出现波浪呼吸。在OB+的CHF患者中,OB周期时间长度与Peak VO₂（r=-0.82）、Peak VO₂%pred（r=-0.65）、AT（r=-0.78）呈负相关,与Lowest VE/VCO₂呈正相关（r=0.61）。结论: 心衰患者波浪呼吸的平均周期时间长度与整体运动能力呈负相关。

Relationship of characteristic duration and magnitude of the oscillatory breathing related with exercise functional capacity in patients with chronic heart failure

Objective: To find out the relationship between the duration and amplitude of oscillatory breathing (OB) and their exercise capacity in patients with chronic heart failure (CHF) we did this study. Methods: Two hundred and thirty-seven CHF patients performed a maximum incremental upright cycle ergometry cardiopulmonary exercise testing (CPET). Respiratory gas exchange was measured on a breath-by-breath basis throughout the test. OB was defined as 3 or more continuous cycle fluctuations of ventilation during CPET, and the amplitude of VE oscillations exceed 25% of concurrent mean value. The CHF patients with OB (OB+) were divided into 3 sub-groups according to their Peak VO₂. Group1 (mild OB+) Peak VO₂ of ≥16 ml/min/kg, group 2 (moderate OB+) Peak VO₂ is between 12~16 ml/min/kg, group 3 (severe OB+) Peak VO₂ ≤ 12 ml/(min·kg). Results: There were 78(32.6%) patients detected as OB+ in 237 CHF patients. Among OB+ patients, OB duration in s related negatively to Peak VO₂ in mL/min/kg (r=-0.82), Peak VO₂ in %pred (r=-0.65), VO₂ at AT (r=-0.78), and related positively to VE/VCO₂ at AT (r=0.61). Conclusion: OB duration is related negatively to exercise capacity of CHF patients.