Single Ventricle Heart Disease

The purpose of this study is to find out if an abdominal pulse oximeter device is as accurate as a conventional fingertip pulse oximeter in pediatric patients. In this study, we will be collecting data from your medical record while you are being treated in the hospital for your clinical care. Your baby will be in the study for 3 days. There will be no additional study visits. We will collect information already being obtained while your baby is at the hospital.

The purpose of this research is to determine whether treatment with the study drug dapagliflozin for 3 months affects peripheral venous pressure at rest and during exercise in adults with failing Fontan circulation.

This study will evaluate the clinical efficacy and safety of udenafil, an orally administered, potent and selective inhibitor of PDE5, versus placebo for the treatment of adolescent who have had the Fontan procedure.