Nitroglycerine exes beneficial effects in classical angina pectoris primarily by:
Increase in total coronary blood flow
Redistribution of coronary blood flow
Reduction of cardiac preload
Reduction of cardiac afterload
(Ref: KDT 6/e p523) Mechanism of action nitrates in classical angina is reduction in preload (due to venodilation) and in variant angina is coronary vasodilation.
Other topics and Adverse effects