Graft failure after bypass surgery?

MY GUY had 5 bypasses (quintuple?) in April. He was feeling fine and regaining strength. He began having chest pains about two months after the surgery and went to the cardiologist. He has had an upper GI to rule out hernia, reflux, etc., and EKG, which looked ok. His blood pressure has been good and he has... show more MY GUY had 5 bypasses (quintuple?) in April. He was feeling fine and regaining strength. He began having chest pains about two months after the surgery and went to the cardiologist. He has had an upper GI to rule out hernia, reflux, etc., and EKG, which looked ok. His blood pressure has been good and he has been going to Cardiac Rehab, but the pain still comes and goes. A few days ago, he had another angioplasty, and three of the five grafts had failed. (Some kind of occulusion). He even overheard the Dr say that he could not see them during this procedure. What would make the grafts fail? he is scheduled to have a Myocardial Viability Scan in a week or so and possibly have stents put in or at the worst, another open heart surgery. Needless to say, we both are very scared. Is this very common that the grafts would close up?
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