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Follow-up coronary angiography showing an irregular subocclusive stenosis of a well-developed first obtuse marginal branch (A, white arrow) and no other significant stenoses (A). After administration of intracoronary nitrates, a complete recover of the vessel patency was noted, and a diagnosis of epicardial spasm was made (B, white arrow). Left ventriculogram showed an improved left ventricular function without frank areas of akinesia (C, D).
