Abstract
Previous attempts to measure high-frequency QRS potentials have been limited by methodologic difficulties in accurately quantitating these low-amplitude potentials. Therefore, we sought a simple, yet quantitative index of high-frequency ECG voltage. To make these high-frequency measurements, we adapted a commercially available microprocessor electrocardiograph with a signal-averaging program to reduce noise and an 80- to 300-Hz bandpass filter. The high-frequency output was then digitized 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 ≥ 0.92) was noted in all leads between the peak-to-peak amplitude of the high-frequency QRS and its rms value. Therefore, peak-to-peak 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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