Preejection period can be calculated using R peak instead of Q.
Preejection period can be calculated using R peak instead of Q.
复制标题
可以使用 R 峰值而不是 Q 来计算预射期。
DOI：
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Veronica M. Lamarche
中科院分区：
文献类型：
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作者：
Mark D. Seery;Cheryl L. Kondrak;Lindsey Streamer;Thomas L. Saltsman;Veronica M. Lamarche
射血前期 (PEP) 是心理生理学研究中交感神经系统激活的常用测量方法，因此对尽可能多的参与者进行可靠测量非常重要。 PEP 通常计算为心电图 Q 波的起始点或峰值与阻抗心动图 B 点之间的间隔，但 Q 波可能缺乏明确的定义，甚至其峰值对所有参与者来说都不是可见的。因此，我们研究了使用心电图 R 波峰值 (Rpeak ) 代替 Q 的可行性，因为它可以轻松、精确地一致识别。在四个样本中（总计 N = 408），年轻的成年参与者在静息基线后完成了各种代谢要求最低的实验室任务。结果始终支持 Rpeak -B 间隔和 PEP 的绝对水平之间的密切关系（平均约占基线方差的 90% 和任务执行过程中的 89%），但对于反应性值，Rpeak -B 实际上与 PEP 没有区别（平均约占方差的 98% 以上）。鉴于使用 Rpeak 而不是 Q 的开始或峰值可以节省时间，消除潜在的主观性，并且可以应用于更多参与者（即那些没有可见 Q 波的参与者），研究结果表明，当绝对水平令人感兴趣时，Rpeak -B 可能提供对 PEP 的充分估计，并且显然对于人体内的变化也是如此。
Preejection period (PEP) is a common measure of sympathetic nervous system activation in psychophysiological research, which makes it important to measure reliably for as many participants as possible. PEP is typically calculated as the interval between the onset or peak of the electrocardiogram Q wave and the impedance cardiography B point, but the Q wave can lack clear definition and even its peak is not visible for all participants. We thus investigated the feasibility of using the electrocardiogram R wave peak (Rpeak ) instead of Q because it can be consistently identified with ease and precision. Across four samples (total N = 408), young adult participants completed a variety of minimally metabolically demanding laboratory tasks after a resting baseline. Results consistently supported a close relationship between absolute levels of the Rpeak -B interval and PEP (accounting for approximately 90% of the variance at baseline and 89% during task performance, on average), but for reactivity values, Rpeak -B was practically indistinguishable from PEP (accounting for over 98% of the variance, on average). Given that using Rpeak rather than the onset or peak of Q saves time, eliminates potential subjectivity, and can be applied to more participants (i.e., those without a visible Q wave), findings suggest that Rpeak -B likely provides an adequate estimate of PEP when absolute levels are of interest and clearly does so for within-person changes.