The overarching goal of this project is to discern how closure of Fontan fenestrations in patients with single ventricle heart disease will affect hepatic congestion, a major determinant of chronic liver disease. We will employ transient elastography (Fibroscan) to obtain liver stiffness measurements (LSM) before and after fenestration closure to study the impact of this intervention on hepatic congestion.
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Immediate change in liver stiffness
Timeframe: Patients will have measurements on day of catheterization and day after catheterization. They will be followed through study completion, an average of 6 months.