Bhargava V, Goldberger A L
Am J Physiol. 1982 Apr;242(4):H507-11. doi: 10.1152/ajpheart.1982.242.4.H507.
Definition of QRS onset and offset is a basic problem in electrocardiography. Current techniques rely either on subjective estimates or on computer algorithms using QRS derivative or spatial vector velocity parameters. We developed a spectral method based on the observation that the QRS complex, unlike the P wave, PR segment, or ST-T complex is comprised of significant frequencies greater than 50 Hz. Accordingly, we adapted a microprocessor-based electrocardiograph (ECG) system with a signal-averaging program to reduce noise and a 50-300 Hz digital filter. Leads I and aVF were simultaneously acquired by computer in 40 subjects with a wide range of QRS duration (55.5-161 ms). Excellent correlation (r = 0.98) was noted between high-frequency QRS duration measurement and careful visual determinations made at high gain and expanded time scale. The high-frequency ECG appears to provide an objective physiological definition of the QRS complex based on spectral content not on morphology or slope.
QRS波起始与偏移的定义是心电图学中的一个基本问题。当前技术要么依赖主观估计，要么依赖使用QRS波导数或空间向量速度参数的计算机算法。我们基于这样的观察开发了一种频谱方法，即QRS波群与P波、PR段或ST-T段不同，它由频率大于50Hz的显著频率成分组成。因此，我们采用了一个基于微处理器的心电图（ECG）系统，该系统带有一个用于降低噪声的信号平均程序和一个50 - 300Hz的数字滤波器。在40名QRS波时限范围广泛（55.5 - 161毫秒）的受试者中，计算机同时采集I导联和aVF导联。高频QRS波时限测量与在高增益和扩展时间尺度下仔细的视觉判定之间存在极好的相关性（r = 0.98）。高频心电图似乎基于频谱内容而非形态或斜率提供了QRS波群的客观生理学定义。
