The document discusses patient selection and management for pediatric and adult extracorporeal membrane oxygenation (ECMO). ECMO is considered for acute, life-threatening respiratory or cardiac conditions that are potentially reversible and unresponsive to conventional therapies. Younger age, fewer days on ventilation pre-ECMO, and better oxygenation predict survival. Venovenous ECMO is preferred over venoarterial when possible. Management involves lung rest through ventilator optimization, maintenance of adequate oxygenation and circulation, and treatment of complications like bleeding and infection during the ECMO run. Weaning and decannulation criteria include clinical and radiographic improvement allowing reduction and then discontinuation of ECMO support.