The surgeon doing the bypass can answer your question very specifically. And this should be covered when the surgeon obtains consent for the procedure. It really depends on the health of the patient prior to the surgery. A recent heart attack, diabetes, a repeat bypass/heart surgery, prior strokes, poor lung function are several problems that could complicate the bypass. But if the patient is in otherwise good health prior to the bypass, and if the surgeon and his/her team are experienced, the chances of a full recovery are excellent and on the order of 97-98 %.