Every body is different. Your body may not react the same way as other people's bodies.
My mother in law went through triple bypass plus they fixed a heart valve. She was never right afterward, her memory was off. After about a year she started sliding into dementia, and soon she couldn't find her way to the store or back home. Less than 2 years after the surgery she dropped dead on the living room floor from another heart attack.
Other people get more mileage out of the surgery. YMMV.
Mike G.
Liberty is meaningless where the right to utter one's thoughts and opinions has ceased to exist. That, of all rights, is the dread of tyrants. --Frederick Douglass
photo: Yosemite Valley view from Taft Point