prospective cardio respiratory evaluation for patients post the Fontan palliation for single ventricle, compared to subjects post successful cardiac repaired surgery compared to healthy volunteers in order to evaluate the functional capacity and the primary etiology for reduction in functional capacity.

Inclusion Criteria:

• Children at age of 8-25 post fontan palliation
• Patients With Repaired Congenital Heart Disease without chronic lung disease
• Healthy patients ate age of 8-25

Exclusion Criteria:

• Patients with chronic lung disease
• Pregnant women
• Patients with acute active disease or chronic disease that may affect the exercise function

1. 15 patients post the Fontal palliation for single ventricular heart
2. 15 subjects post surgical correction of congenital heart disease.
3. 15 healthy subjects.