Which device performs the work of both the heart and the lungs during open-heart surgery?

• A. Surgical Laser
• B. Electrosurgical Unit
• C. Medical Ventilator
• D. Heart-Lung Machine

Answer: (D)

During open-heart surgery, you need everything circulating and being oxygenated while the heart is temporarily stopped. The heart-lung machine handles both roles—it acts as a pump to circulate blood and as an oxygenator to swap gases—so blood is kept moving and loaded with oxygen in the body’s circulation. It draws blood from the venous system, oxygenates it and removes CO2, then returns it to the arterial circulation, all while warming or cooling as needed. This creates a safe, still field for the surgeon. The other devices don’t provide both functions: a surgical laser and an electrosurgical unit cut or coagulate tissue, not circulate blood or oxygenate it, while a medical ventilator only moves air in and out of the lungs without circulating blood.