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Only if he went off of the coumadin suddenly. Then the blood would clotBlood clots up thicker than before starting Coumadin. If he had to have a doubleDouble-tussin dm bypass then he has had blockage for awhile. Coumadin prevents blood clots by thinning out the blood. Knee replacement surgery along with any other surgery has the risk of blood clots after surgery. That is why Coumadin is prescribed after surgery. How much heart damage did he have? He will need to take his medication as prescribed once he returns home and will have to watch his diet and be strict about it. Can't risk another bad heart attack.