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Coronary angiograms both before and after intracoronary nitroglycerin: (a) right coronary artery spasm (arrow), (b) right coronary artery after intracoronary nitroglycerin, (c) left circumflex and obtuse marginal artery spasm (arrow), (d) left circumflex and obtuse marginal artery after intracoronary nitroglycerin, (e) left anterior descending artery spasm (arrows), (f) left anterior descending artery after intracoronary nitroglycerin.
