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Ann Thorac Surg 1995;60:1324-1330
© 1995 The Society of Thoracic Surgeons

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Original Articles: Cardiovascular

Cardiac Anatomy in Patients Undergoing the Fontan Procedure

Departments of Cardiology and Cardiac Surgery, Royal Children's Hospital, Victoria, Australia

Accepted for publication July 10, 1995.

Background. Controversies in nomenclature, especially of hearts with ``single ventricle,'' have clouded discussion and understanding of the anatomy. Many patients with such malformations are submitted to the Fontan procedure as definitive surgical palliation. The spectrum of anatomy among these patients is wide and deserves analysis in an effort to provide a simple framework for description and to eliminate confusion.

Methods. We reviewed 138 successive patients undergoing the Fontan operation at one institution to demonstrate the variability in pathology.

Results. Only 89 patients (65%) had a univentricular type of atrioventricular connection. All but 5 patients had two ventricular chambers. Among the 49 patients with biventricular atrioventricular connections, 43 had a hypoplastic ventricle that precluded a biventricular repair.

Conclusions. Full understanding of the malformations that may preclude a ``biventricular'' repair and hence necessitate a Fontan procedure requires knowledge of the different forms of univentricular atrioventricular connection that, although usually associated with two ventricular chambers, are seldom amenable to a ``two-pump repair.'' Understanding of those types of ``biventricular heart'' that preclude a two-pump repair (eg, severe hypoplasia of the left ventricle or the right ventricle) or are associated with high risks (eg, straddling atrioventricular valve) is also important.

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