Tetralogy of fallot
In the normal heart, there are two atria and two ventricles. Blood comes back from the body from the superior vena cava (SVC) and inferior vena cava (IVC) to the right atrium through the tricuspid valve to the right ventricle. The ventricle contracts and blood is pumped through the pulmonary valve to the pulmonary arteries out to the lungs where the blood is oxygenated. Blood returns from the lungs by the pulmonary veins to the left atrium. It then travels from the left atrium through the mitral valve to the left ventricle. The left ventricle contracts, sending blood through the aortic valve through the aorta and out to the body.