Can medicines reduce heart block?

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Any blockage of more than 70% if possible should be stented. In your father's case heart attack was due to mid LAD block (left anterior descending coronary artery) which has been treated. OM (obtuse marginal) branches supply papillary muscles and posterolateral wall of left ventricle, these are also significantly blocked but area supplied by them may have collaterals that we cannot say as collaterals are very tiny vessels. But, as he is on antiplatelet medicine now mostly he will not get sudden block of OMs. You can wait and see how he is feeling on walking and exertion. If no pain then ask your consultant for TMT (Treadmill test) and then decide for plasty. For further information consult a cardiologist online.

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Papillary muscles are muscles that hold and maintain closing of valves between atrium (upper) and ventricle (lower chamber). If supply to them stopped, some part of them will be dead then valve will leak blood back to upper chamber. Collaterals are tiny blood vessels from a big vessel. In this case collaterals can come from LAD (which is stented now) to papillary muscles which are mainly supplied by OM. So, these muscles have blood supply from two places. No, blocks cannot be reduced by medicine. Medicines can prevent heart attack because heart attack comes when a blood clot comes in a blocked vessel and that will not occur when you are on Aspirin (Ecosprin) and Deplatt (Clopidogrel). For further information consult a cardiologist online.