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EN
Tetralogy of Fallot is a heart defect caused by a combination of four problems:
* Ventricular septal defect: A large hole exists between the ventricles.
* Pulmonary stenosis: Narrowing of the pulmonary valve reduces blood flow to the lungs.
* Right ventricular hypertrophy: The right ventricle becomes abnormally thick due to overworking to overcome the outflow obstruction.
* Overriding aorta: Normally, the aorta originates from the left ventricle. In Tetralogy of Fallot, the aorta is shifted slightly to the right and lies directly over the ventricular septal defect. This is referred to as an overriding aorta.
All four features must be present for the condition to be classified as Tetralogy of Fallot.
What are the four features of Tetralogy of Fallot?
* Ventricular septal defect: A large hole exists between the ventricles.
* Pulmonary stenosis: Narrowing of the pulmonary valve reduces blood flow to the lungs.
* Right ventricular hypertrophy: The right ventricle becomes abnormally thick due to overworking to overcome the outflow obstruction.
* Overriding aorta: Normally, the aorta originates from the left ventricle. In Tetralogy of Fallot, the aorta is shifted slightly to the right and lies directly over the ventricular septal defect. This is referred to as an overriding aorta.
All four features must be present for the condition to be classified as Tetralogy of Fallot.