I'm really concerned about my dad. He's 55 and dealing with diabetes and high blood pressure, and he was told he needs to decide about a second open-heart surgery. The first one he had was an off-pump coronary artery bypass using a vein from his leg. He's supposed to have this new surgery by the end of the year. Can you help me understand what kind of risks he might be facing with this surgery?

Infection,bleeding ,allergic reactions and headache are some of the complications of the surgery.