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Because the left main coronary artery feeds two of the three main coronary arteries of your heart .
.. So a left main coronary blockage will cause a heart attack of two thirds of your heart, including most of the left ventricle ...
That depends on how much muscle is damaged.
If 40% or more of the heart muscle is damaged, the mortality is greater than 50% from heart failure. But that assumes the person gets past the first eight hours during death rate is as high as 25% from arrhythmias.