Heart attack, death. The technique of coronary bypass has matured over the years, and now carries an operative mortality of about 1-2%. Factors that increase risk are smoking, obesity, redo procedure. At 41 years old, assuming you are not a heavy smoker, you should do well.
Risks of CABG. Main risks include wound infection, post op pneumonia, post or peri operative heart attack, stroke, requirement for blood transfusion, transient memory loss or dementia, kidney dysfunction and positioning injuries. A lot of items but keep in mind all of these are very low and as with any surgery, a risk/benefit analysis is important to consider.