Question: what are the risks of a quadruple bypass?
Answer: Risk of bleeding from site of attached graft and other sources. ... 
Heart rhythm problems. ... 
Blood clots. ... 
Infection at the incision site where the chest was opened for surgery. ... 
"Post-pericardiotomy syndrome." This condition occurs in about 30 percent of patients from a few days to 6 months after coronary bypass surgery.