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Reversible Pulmonary Hypertension Due to Adenotonsillar Hypertrophy in a Patient for Fontan Operation

A normal pulmonary vascular resistance is the primary determinant of operability and long-term outcome in the Fontan repair for functional single ventricle.' We describe a case where increased pulmonary vascular resistance may have resulted from unrecognized upper airway obstruction due to adenotonsillar hypertrophy. Following adenotonsillectomy (T&A), the pulmonary vascular resistance returned to normal, allowing a successful Fontan repair.