The Heart-Lung Machine in Open-Heart Surgery: How It Works
During open-heart surgery, the heart-lung machine (cardiopulmonary bypass) temporarily takes over the functions of the heart and lungs, allowing the surgeon to operate on a still, bloodless field.
Core Functions
- Oxygenation: Venous blood is diverted to an oxygenator, where CO₂ is removed and O₂ is added.
- Circulation: A pump returns oxygenated blood to the arterial system, maintaining perfusion of vital organs.
- Temperature control: Blood can be cooled (hypothermia) to reduce metabolic demand, then rewarmed.
- Filtration: Removes air bubbles, clots, and debris.
Why It's Essential
- Enables complex repairs (valve replacement, CABG, congenital defect correction).
- Provides a motionless, bloodless surgical field for precision.
- Protects brain, kidneys, and other organs during cardiac arrest.
Risks and Advances
Potential complications include inflammation, coagulopathy, and neurologic injury. Modern machines, miniaturized circuits, and refined protocols have significantly reduced these risks.
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- Ian Donald: Pioneer of Medical Ultrasound – First Real-Time Scanner, Ultrasound-Guided Amniocentesis (1958)