<prompt> A patient of prinzmetals angina is started on isosorbide mononitrate. What is the mechanism of action of nitrates in this condition?Reduced cardiac contractilityIncreased left ventricular end diastolic volumeDecreased diastolic perfusion pressureEndothelium independent coronary vasodilation  <response>: Ans. D Endothelium independent coronary vasodilationRef: KDT 7the p541Predominant mechanism of action of nitrates in angina:In Classical angina: Decrease in preloadIn Variant angina: Coronary vasodilation 