Extracorporeal Membrane Oxygenation (ECMO)

Introduction And Core Principles

Extracorporeal membrane oxygenation is a highly advanced, life-sustaining modification of cardiopulmonary bypass providing prolonged cardiac and respiratory support.
Functions as a temporizing measure acting as a bridge to recovery, destination therapy, or cardiopulmonary transplantation.
Deoxygenated venous blood is drained using a centrifugal pump, passed through a polymethylpentene oxygenator for gas exchange, warmed, and returned to the patient.
The application has shifted from a salvage therapy of last resort to a preemptive, protocolized intervention.

Modality	Physiological Support	Clinical Characteristics And Recent Advances
Veno-Venous (VV)	Exclusive respiratory support	Relies on native cardiac output; modern practice favors single-site, double-lumen cannulas to improve patient mobility and reduce decannulation risk.
Veno-Arterial (VA)	Full hemodynamic and respiratory support	Bypasses heart and lungs to unload ventricles; modality of choice for cardiogenic shock and myocarditis.
Hybrid (VVA/VP)	Targeted cardiorespiratory support	Veno-Veno-Arterial (VVA) optimizes upper body oxygenation; Veno-Pulmonary (VP) directly addresses isolated right ventricular failure.

Respiratory indications include severe acute respiratory distress syndrome, refractory viral pneumonias, meconium aspiration syndrome, and congenital diaphragmatic hernia.
Cardiac indications feature fulminant viral myocarditis, acute decompensated heart failure, and complex congenital heart disease.
Extracorporeal cardiopulmonary resuscitation deployed within 30 to 45 minutes of refractory cardiac arrest yields significantly higher neurologically intact survival.

Absolute contraindications include lethal chromosomal anomalies, severe irreversible brain injury, massive intracranial hemorrhage, and terminal malignancies.
Extreme prematurity (less than 34 weeks gestation) or weight less than 2 kilograms remain strong relative contraindications due to the high risk of catastrophic intraventricular hemorrhage from systemic anticoagulation.

Polymethylpentene hollow-fiber oxygenators eliminate plasma leak, lower resistance, and extend functional lifespans, reducing inflammatory responses.
Biomimetic circuit coatings with nitric oxide-releasing polymers significantly blunt the contact activation of the coagulation cascade and systemic inflammatory response syndrome.
Magnetically levitated centrifugal pumps drastically reduce shear stress, resulting in decreased circuit-induced hemolysis and subsequent acute kidney injury.

Massive pharmacological shift is occurring from unfractionated heparin to Bivalirudin.
Bivalirudin provides predictable anticoagulation and is associated with a marked reduction in major hemorrhagic complications.
Routine supplementation with Factor XIII concentrate is actively employed to mitigate refractory surgical site and mucosal hemorrhage during prolonged runs.

Mandates continuous multimodal neuromonitoring utilizing Near-Infrared Spectroscopy, serial transcranial dopplers, and continuous electroencephalography.
Promotes early, cautious trophic enteral feeds even with high inotrope scores to prevent gut mucosal atrophy and bacterial translocation.

Primary retrieval utilizes specialized mobile teams utilizing miniaturized transport consoles to stabilize and transport the child back to apex centers.
Up to 30% of pediatric survivors suffer from Post-Intensive Care Syndrome.
Institutions utilize the Standardized Therapy after ECMO Program (STEP) for intentional, multidisciplinary discharge and longitudinal neurodevelopmental follow-up.