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This report describes a 45-year-old Japanese man who had episodes of anginal chest pain on effort. Coronary arteriography in the baseline state revealed subtotal occlusion in the mid-portion of the left anterior descending coronary artery. After intracoronary infusion of an endothelium-dependent vasodilator, substance P, the subtotal occlusion was immediately abolished. We concluded that endothelium-dependent vasodilation evoked with substance P was present at the site where coronary vasospasm occurred spontaneously in our case.

Immediate Relief of Spontaneous Coronary Artery Spasm by Intracoronary Infusion of an Endothelium-dependent Vasodilator, Substance P.