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Coronary spasm under in vivo conditions. Coronary angiography and electrocardiograms were obtained before and after the intracoronary administration of 10 µg/kg of serotonin at week 8 [2 weeks after 4 endothelial denudation (ED) procedures] in one example with a repeated ED in the left anterior descending (LAD) coronary artery group. LAD narrowing occurred at the ED site (arrow), corresponding with the ischemic ST-segment change in the electrocardiogram leads II and V5
