Study of the Relationship Between Calcium Levels and Intact Parathyroid Hormone (iPTH) in Adults With Repaired or Palliated Conotruncal Cardiac Defects
OBJECTIVES: I. Identify latent hypoparathyroidism in normocalcemic adult survivors with repaired conotruncal cardiac defects, by evaluating parathyroid gland secretory function after induced hypocalcemia.
II. Determine the relationship of parathyroid hormone secretion to microdeletions in the same region of chromosome 22q11 as found in patients with DiGeorge anomaly.
Tetralogy of Fallot
Pulmonary Valve Stenosis
Conotruncal Cardiac Defects
Heart Defects, Congenital
Drug: calcium gluconate
Drug: sodium citrate
|Study Design:||Primary Purpose: Screening|
|Study Start Date:||July 1995|
Patients are given sodium citrate over a 2 hour infusion on day 1. Blood is drawn at times -30, -15, 0, and every 10 minutes thereafter during the infusion. On day 2, patients are given calcium gluconate over a 2 hour infusion. Blood is drawn at times -30, -15, 0, and every 10 minutes thereafter during the infusion.
|Study Chair:||Craig B. Langman||Ann & Robert H Lurie Children's Hospital of Chicago|