This study aims to explore the structural and functional characteristics of the pulmonary vasculature in adult Fontan patients. Objectives: * Determine the effect of pulmonary vasodilatation on indexed cardiac output during simulated exercise. * Characterization of structural properties of small pulmonary arteries.
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vasodilatation
Timeframe: change in indexed cardiac output between baseline and after 10 minutes of pulmonary vasodilatation at heart catheterization
number of intimal lesions in small pulmonary arteries
Timeframe: baseline at heart catheterization