โ Scribed by Ary L. Goldberger; Valmik Bhargava
No coin nor oath required. For personal study only.
Previous attempts to measure high-frequency QRS potentials have been limited by methodologic ditkulties in accurately quantitating these low-amplitude potentials. Therefore, we sought a simple, yet quantitative index of high-frequency ECG voltage. To make these high-&equency measurements, we adapted a commercially available microprocessor electrocardiograph with a signal-averaging program to reduce noise and an 8O-to MO-Hz bandpass filter. The high-frequency output was then diitized and the rms value of the signal was computed in leads I, II, III, aVL, and aVF in both normal subjects and patients with organic heart disease. An excellent correlation (r 2.0.92) was noted in all leads between the peak-topeak amplitude of the high-frequency QRS and its rms value. Therefore, peak-topeak amplitude can be used as an easily measured index of high-frequency potentials. Quantitative high-frequency electrocardiography may be helpful in increasing the diagnostic accuracy of the conventional ECG.
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