although a wide variety of provocative agents and physiologic maneuvers may precipitate coronary artery spasm in susceptible patients with prinzmetal 's variant angina , ergonovine maleate testing has been demonstrated to be the safest when followed in a highly structured protocol which mandates not only electrocardiographic monitoring but immediate reversal of spasm by intravenous or intracoronary nitroglycerin .
C0002963
prinzmetal 's
C0059514
ergonovine maleate