Information please!

Take a breath!  It will be okay.  If they find a blockage, they can do angioplasty, and insert a stent.  I stent will keep the blocked area open.  You should feel lucky that they are finding a possible blockage BEFORE he had a heart attack.  My 52 year old husband has had 2 heart attacks, and he has 6 stents.  He works, and is just like he was before the heart attacks (he had no lasting heart damage).  The stent will actually make him feel better.  He will probably be on a statin (for cholesterol, aspirin, a blood thinner - probably Plavix, and a beta blocker).  If he smokes, he will have to quit (well at least that is what the cardio's will want).  He should have a low fat diet, and exercise according to his doctors recommendations).  He will be fine.  You may want to do some research on medicated and non-medicated stents - there has been a great deal of controversary about medicated stents recently.  Good luck - and try not to worry about him.