The Fontan procedure has revolutionized the treatment of patients born with a congenital univentricular heart defect. However, over time, it is associated with severe lymphatic complications such as plastic bronchitis, protein-losing enteropathy (PLE) and peripheral edema. The hypothesis is that patients with a univentricular circulation have a changed morphology which may be associated with both the degree of lymphatic complications and their physical capacity. The morphology will be described using T2-weighted non-contrast MRI.
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Lymphatic classification
Timeframe: 1 hour
Relative measure of tortuosity
Timeframe: 1 hour
Measurement of thoracic duct volume
Timeframe: 1 hour
Measurement of thoracic duct diameter
Timeframe: 1 hour
The International Physical Activity Questionnaire (IPAQ-SF)
Timeframe: 1 hour
CPX heart rate
Timeframe: 1 hour
CPX Vo2
Timeframe: 1 hour