目的研究平板运动试验(treadmill exercise test
TET)中心室复极梯度(ventricular gradient
VG)的动态变化和心率恢复(heart rate recovery
HRR)的特点
以及两者之间的相关性
为自主神经功能的评价提供新的预测方法。方法对40例健康体检(如飞行员)或冠心病可疑阳性但冠脉CT结果为阴性的成年人进行TET检查。试验开始后连续同步记录体表12导联心电图并分别于运动终止后第1、2、3、4、5、6min采集心电向量图。分析运动终止后第1、2、3、4、5、6min的心率恢复以及6份心电向量图心室复极梯度的动态变化
并且对心率恢复和心室复极梯度各参数的相关性进行研究分析。结果 (1)运动终止后心率恢复的变化主要集中在运动终止后前4min;(2)运动终止后不同时间的心室复极梯度各参数VG振幅、VG水平角及VG仰角的变化分别主要在运动终止后前2min、前3min、前2min;(3)运动终止后不同时间的心率恢复分别与VG水平角和仰角存在明显相关(R=0.209
p<0.05;R=0.238
p<0.05);与VG振幅无明显相关性(R=-0.121
p<0.05)。结论运动试验终止后
心室复极梯度与时间存在明显的相关性
主要集中在前2min
而心率恢复集中在前4min。心室复极梯度的变化时间窗较窄
而心率恢复的变化时间窗较宽。心室复极梯度可能成为评价自主神经功能的一种新的预测方法。
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