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Coronary arterial spasm in angina at rest associated with transient ST‐segment changes

In order to clarify the role of coronary arterial spasm in the pathogenesis of angina at rest, coronary arteriography was performed during spontaneous chest pain or following intravenous administration of ergonovine maleate in 40 patients with angina at rest. Coronary vasospasm was demonstrated in 23 patients with ST‐segment elevation during chest pain (group I), in 7 with ST‐segment depression (group II), and in 4 with both ST‐segment depression and elevation (group III).