Hyperoxia is common during pediatric extracorporeal membrane oxygenation (ECMO) and associated with mortality. Hypocapnia appears to occur less often and although associated with complications, an association with mortality was not observed. Of 484 patients, 420 (86.7%) had venoarterial extracorporeal membrane oxygenation and 64 (13.2%) venovenous; 69 (14.2%) had extracorporeal membrane oxygenation initiated during cardiopulmonary resuscitation.

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