The high frequency electrocardiogram in coronary artery disease.

The high-frequency ECG clearly contains information not available in the conventional ECG. Patients with angina pectoris could not be identified as statistically different from the normal group based on notching, although isolated examples existed. MI, on the other hand manifested abnormal notch counts in the presence of absence of abnormal Q-waves. We were unable to correlate the treadmill exercise test or the site of the arterial lesion with the high-frequency ECG. Pathophysiologic mechanisms are discussed.