This is an investigator initiated, prospective, single-center, double-blinded, randomized, placebo-controlled trial of post-operative low dose vasopressin infusions as an early treatment of low systemic perfusion in pediatric patients following Fontan palliation.
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Hemodynamics as Characterized by Vasoactive Inotrope Score (VIS)
Timeframe: 48 hours post-operative
Hemodynamics as Characterized by Mean Arterial Pressure
Timeframe: 24 hours post-operative
Hemodynamics as Characterized by Transpulmonary Pressure Gradient
Timeframe: 24 hours post-operative