absolutely he should go for an angiogram, there is no doubt about it. The Cardiologist needs to know which arteries are affected, and by how much. Angiogram is the gold standard. If you don't have an angiogram, you will be guessing that everything will be fine, and hoping he doesn't have a heart attack and die.
Thanks for your suggestion. He hadindergone with Angiogram and multiple blocks in 4 of the arteries has been found. Doctors suggested for CABG surgery. Can it be treated by medicine? He has 100% block in one artery, 95%, 90%, 90% in others.
Unfortunately there is no medication to remove those blockages, millions of people wish there is. Your Cardiologist is definitely making the right decisions and you should trust in him. I think the best course of action is bypass surgery. I know the thought of such surgery is frightening, I've had it done myself, but really it is the best action. If your Father in Law has any questions about what to expect, I will be happy to answer them, so will some others on this forum who have also endured the procedure.
Thank you very much for your valuable suggestion. In case of any further querries or concern, I will surely come back to you. Thanks once again