<prompt> Nitroglycerine exes beneficial effects in classical angina pectoris primarily by:Increase in total coronary blood flowRedistribution of coronary blood flowReduction of cardiac preloadReduction of cardiac afterload  <response>: Ref: KDT 6e p523 Mechanism of action nitrates in classical angina is reduction in preload due to venodilation and in variant angina is coronary vasodilation. 