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Other causes of MI

My mother had a heart attack 3 weeks ago. She's 53 years old, she never had high levels of cholesterol, she's not overweighted , she used to exercise and does not smoke, no family history of MI.
She did an angioplasty and stent to the 99% blocked artery and the doctors found 3 arteries with stenosis (70% and 30%).
What can cause a MI when you don't have all the major risk factors?
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367994 tn?1304953593
No family history (known) does not rule out genetic predisposition for an MI...but the probability is greatly reduced.  

Many heart attacks occur with the rupture of the inner lining (endothelium cells) of the artery due to plaque buildup between the inner and outer wall of the artery.  A cath angiogram does not show the risk, but a CT scan 64 slice can/will evaluate the anatomy of vessels for the risk of a heart attack from that source (many more attacks from rupture than occluded vessels).

I am assuming the MI is ischemic (lack of blood flow to the heart).  It is estimated about 26% of the heart disorder population have had a silent heart attack and are unaware.  I had had a silent heart attack about 5 years ago, and the first symptom was congested heart failure.  Heart cells where ineffective in contracting the ventricle due to a lack of blood supply.



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