How does a Fontan works?
After the Fontan Procedure, the blood without oxygen comes back from the body and is being ejected in the lungs without being pushed by the heart. This flow is driven by two main forces: an increased pressure in the veins and breathing.
After the Fontan Procedure the pressure in the veins is increased from 0 to 6mbar to 20 to 26 mbar.
When breathing in the inside of the chest is increased and air get sucked into the airways, at the same time blood is sucked into the lungs. When breathing out the space in the chest is reduced, the air get pushed out of the airways and the blood pushed out of the lungs. Therefore it is important for Fontan patients, to have good lungs.
In addition to good lungs, the Fontan Procedure requires a good working heart and good lung arteries without restriction.