ARRHYTHMIAS IN VARIANT ANGINA-PECTORIS - RELATIONSHIP OF ARRHYTHMIAS TO ST-SEGMENT ELEVATION AND R-WAVE CHANGES

Twenty-six patients with variant angina pectoris (VAP) were studied 1) to determine whether the degree of ST-segment elevation and R-wave changes correlate with the development of arrhythmias; and 2) to evaluate the relationship between the perevalence of arrhythmias, the severity of coronary artery disease, left ventricular function and wall motion. Serious arrhythmias were found in 12 patients (46%) (ventricular fibrillation in two, ventricular tachycardia in four, ventricular premature complexes [VPCs] [>5 VPCs/min, multifocal and R-on-T phenomenon] in four, and second- and third-degree atrioventricular block in three). All twelve patients with arrhythmias had ST-segment elevation ≥0.4 mV during VAP (range 0.4-1.6 mV). R-wave amplitude was compared before and during episodes of VAP and expressed as %ΔR. An increase in R≥10% was seen in 10 of 12 patients with arrhythmias (group 1) and in only six of 14 patients without arrhythmias (group 2) (p<0.05). Twenty-three of the 26 patients underwent coronary angiography and ventriculography, and one was examined by autopsy. Sixteen patients in this group had single or multiple high-grade obstructive lesions, while the remaining eight had normal coronary arteriograms. Arrhythmias were more common in the group with coronary obstructive disease (66%) than in the group with normal coronary arteriograms (44%). There was no significant difference between patients with arrhythmias (group 1) and those without arrhythmias (group 2) in the coronary arteriographic score or left ventricular ejection fraction. The data suggest that arrhythmias occur frequently during VAP and correlate well with the degree of ST-segment elevation and %ΔR. In patients with VAP, arrhythmias are not contingent upon preexisting coronary artery disease or left ventricular ejection fraction, and are more commonly detected in patients with normal coronary arteriograms.