The drug mainly causing afterload reduction is:
ACE inhibitors are mixed dilators. They inhibit the generation of angiotensin II resulting in dilatation of aerioles which decreases peripheral vascular resistance and thereby after load. Nitrates are primarily venodilators- decrease Cardiac output mainly calcium channel blockers are mainly aeriolar dilators -decreases peripheral vascular resistance by causing vasodilatation (Ref- ESSENTIAL OF MEDICAL PHARMACOLOGY-K.D TRIPATHI)
Digoxin
Captopril
Dobutamine
Frusemide
Cardiovascular system