ECMO and Heart-Lung Machine Differences

Primary Distinctions

Heart-lung machines are used exclusively for very short-term support during surgery in the operating room, typically for hours during a single operative procedure, as stated by the American Thoracic Society 1, 2, 3
ECMO is designed for prolonged extracorporeal circulation in the ICU setting, providing temporary life support for days to weeks, according to the American College of Chest Physicians 1

Venovenous (VV) ECMO drains blood from the venous system, oxygenates it through a membrane oxygenator, and returns it to the venous system, providing isolated respiratory support when cardiac function is adequate, as recommended by the American Thoracic Society 1, 2
Venoarterial (VA) ECMO drains blood from the venous system and actively pumps oxygenated blood into the arterial circulation, providing both cardiac and respiratory support for combined cardiopulmonary failure, as stated by the American College of Cardiology 1, 2

ECMO should only be performed at high-volume centers (>20-25 cases annually) with 24/7 multidisciplinary teams, as recommended by the European Society of Intensive Care Medicine 1, 4
Severe acute respiratory failure with PaO₂/FiO₂ < 80 mmHg for at least 3 hours despite optimal ventilation may require ECMO support, according to the American College of Chest Physicians 4

Acquired von Willebrand syndrome develops in almost all ECMO patients within hours of device implantation, contributing to bleeding risk, as reported by the International Society on Thrombosis and Haemostasis 4
Thrombotic events occur in 42% of VV-ECMO patients despite anticoagulation, as stated by the American Heart Association 4
Left ventricular overload is a specific complication of VA-ECMO that may require additional mechanical unloading devices, as recommended by the European Society of Cardiology 4