Final answer:
OPCAB and CPB are two different surgical techniques used in coronary artery bypass surgery. OPCAB involves performing the bypass graft on the beating heart, while CPB involves stopping the heart with the help of a heart-lung machine.
Step-by-step explanation:
OPCAB (Off-pump Coronary Artery Bypass) and CPB (Cardiopulmonary Bypass) are both surgical techniques used in coronary artery bypass surgery. They differ in their approach to bypass the blocked coronary arteries.
In OPCAB, the heart is beating during the surgery, and the bypass graft is performed on the beating heart. This technique avoids the need for the heart-lung machine, reducing the risk of complications associated with it.
On the other hand, CPB involves the use of a heart-lung machine to temporarily take over the functions of the heart and lungs. This allows the surgeon to stop the heart and perform the bypass graft on a still heart. CPB provides a stable surgical field but carries the risk of complications associated with the use of the heart-lung machine.