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The different types of Fontan-type procedures, grouped in main patterns (a–c). Direct atriopulmonary connection without interposition of conduits (a). Intracardiac lateral tunnel draining the IVC into the pulmonary circulation bypassing the right ventricle (b). Extracardiac conduit draining the IVC blood into the pulmonary arteries (c). In (b) and (c), a bidirectional Glenn anastomosis drains SVC blood to the right pulmonary artery
