R R

What Is a Cardiopulmonary Bypass Machine?

A cardiopulmonary bypass machine is a heart-lung machine used during certain surgeries to temporarily take over the work of the heart and lungs. It pumps blood outside the body, adds oxygen, removes carbon dioxide, and returns the blood to circulation. The machine allows surgeons to operate on a still or bloodless heart in selected procedures. It is operated by a trained perfusionist as part of the cardiac surgical team.

Link to This Resource Page

Provide a valuable resource to your clients or customers by linking to this resource page. Just place the following link on your website.

To display this...

What Is a Cardiopulmonary Bypass Machine?

A cardiopulmonary bypass machine is a heart-lung machine used during certain surgeries to temporarily take over the work of the heart and lungs. It pumps blood outside the body, adds oxygen, removes carbon dioxide, and returns the blood to circulation. The machine allows surgeons to operate on a still or bloodless heart in selected procedures. It is operated by a trained perfusionist as part of the cardiac surgical team.

read more about cardiopulmonary bypass machine ...

Copy this HTML:

Copy HTML Copied!

What Is a Cardiopulmonary Bypass Machine Used For?

A cardiopulmonary bypass machine is used during many open-heart surgeries and some major procedures involving the heart, great vessels, or lungs. It may be used for valve surgery, congenital heart repair, heart transplant, aortic surgery, or coronary bypass procedures when the heart needs to be stopped or bypassed. The machine helps maintain circulation and oxygen delivery while the surgeon works. The decision to use bypass depends on the operation and patient condition.

How a Cardiopulmonary Bypass Machine Works

Blood is diverted from the patient through cannulas into the bypass circuit. The machine pumps the blood through an oxygenator, where oxygen is added and carbon dioxide is removed. The blood may also be filtered, cooled, warmed, and returned to the body through another cannula. During the procedure, the perfusionist monitors flow, pressure, temperature, oxygenation, anticoagulation, and machine function.

Parts of a Cardiopulmonary Bypass System

A bypass system includes pumps, tubing, cannulas, an oxygenator, heat exchanger, reservoir, filters, monitors, and safety alarms. Medication is used to reduce clotting while blood moves through the circuit. Some procedures also use cardioplegia solution to stop and protect the heart. Each component must be prepared, checked, and managed carefully before and during bypass.

Risks and Monitoring

Cardiopulmonary bypass carries risks such as bleeding, clotting, inflammation, stroke, kidney injury, infection, low blood pressure, air embolism, or organ stress. Anticoagulation and careful monitoring help reduce complications. After surgery, patients are monitored in a recovery or intensive care setting for heart rhythm, breathing, bleeding, kidney function, and neurologic status. Chest pain, severe shortness of breath, confusion, weakness, heavy bleeding, or worsening swelling requires urgent care.

FAQs About Cardiopulmonary Bypass Machines

Is a cardiopulmonary bypass machine the same as ECMO?

No. Both can oxygenate and circulate blood outside the body, but cardiopulmonary bypass is usually used during surgery for shorter periods, while ECMO can provide longer intensive-care support.

Who operates a cardiopulmonary bypass machine?

A trained perfusionist usually operates the machine with the cardiac surgery and anesthesia team.

Does the heart stop during cardiopulmonary bypass?

In many procedures, the heart is stopped with medication so the surgeon can operate. In other cases, bypass may support circulation while the heart continues beating.

Is cardiopulmonary bypass risky?

Yes. It is a major surgical support technique with serious risks, but it is closely managed by specialized teams during procedures where it is needed.

References

What is Cardiopulmonary Bypass? Cleveland Clinic. https://my.clevelandclinic.org/health/treatments/24106-cardiopulmonary-bypass. Date Accessed June 18, 2026.

Cardiopulmonary Bypass. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK482190/. Date Accessed June 18, 2026.

Coronary Artery Bypass Graft. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK507836/. Date Accessed June 18, 2026.

Myocardial Protection. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK567795/. Date Accessed June 18, 2026.

Tips, Tricks, and Pitfalls for Cardiopulmonary Bypass. CTSNet. https://www.ctsnet.org/article-video/tips-tricks-and-pitfalls-cardiopulmonary-bypass/. Date Accessed June 18, 2026.