Why is a heart-lung machine needed while doctors operate on own heart?

During open-heart surgery, when a surgeon operates directly on the heart, a heart-lung machine is essential to

- Provide temporary circulatory and respiratory support: The machine takes over the functions of the heart and lungs, keeping the blood circulating and oxygenated.

- Stabilize the heart: The machine stabilizes, the operating site, allowing for a more precise and controlled surgical procedure.

- Ensure blood flow to vital organs: The machine ensures that blood flows to the body's vital organs and tissues, oxygenating them and preventing damage while the heart is bypassed.

- Reduce surgical risk: By using a heart-lung machine, surgeons can perform complex heart procedures with reduced risk to the patient.