Liothyronine in Children With Single Ventricle Congenital Cardiac Malformations Undergoing the Fontan Procedure
OBJECTIVES: I. Determine the pharmacokinetics of exogenous liothyronine administered in children undergoing the modified Fontan procedure.
II. Determine the liothyronine supplementation dose that counters the fall in serum liothyronine concentrations and provides the greatest potential myocardial benefit after the modified Fontan procedure.
III. Evaluate the potential toxicity of exogenous liothyronine administered in children undergoing a modified Fontan procedure.
Heart Defects, Congenital
Drug: liothyronine I 131
|Study Design:||Allocation: Randomized
Primary Purpose: Treatment
|Study Start Date:||December 1994|
|Estimated Study Completion Date:||December 1997|
PROTOCOL OUTLINE: This is a randomized, placebo controlled, dose escalation study.
Initially, patients are randomized to receive either 1 of 3 different dosages of liothyronine or placebo after undergoing the Fontan procedure. If no unacceptable toxicity is observed in this group, a third dose level of liothyronine is added to the randomization. A total of 7 patients are enrolled at each dose level. All randomized study drugs are administered by continuous infusion over 1 hour after surgery.
Cardiac function is assessed 5 days after surgery.
|Study Chair:||Richard Mainwaring||Children's Hospital and Health Center|