Which of the following agent decreases cardiac afterload?

Nicorandil reduces afterload and preload, while in the coronary circulation it dilates both the large epicardial and smaller resistance vessels. Because Nicorandil is an anteriolar dilator and hence primarily decrease after load. Hydralazine and minoxidil reduce afterload by relaxing aeriolar smooth muscle. The venodilators and diuretics are used to decrease preload. The venodilators include nitroglycerine and isosorbide dinitrite. Drugs that reduce both prelod and afterload include nitroprusside, prazosin, ACE inhibitors and angiotensin II receptor blockers.