Fontan patients exhibit markedly impaired CPX variables, and all the major variables, especially peak VO2 , predicted the risk of both morbidity and mortality.

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Anticoagulant regimens in Fontan patients varied widely with a significant trend for warfarin use in patients with impaired haemodynamics. Low arterial oxygenation may predict haemostatic events. The relatively high prevalence of haemorrhagic complications indicates the need for individualized anticoagulant administration throughout the follow-up.

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