Tetralogy of Fallot is a serious congenital heart defect characterized by a ventricular septal defect, pulmonary stenosis, and problems with right ventricular obstruction. It is a congenital disease that can cause hypoxia throughout the body, especially as age increases, the symptoms tend to worsen. After the corrective surgery for Tetralogy of Fallot, it does not mean that the patient is completely normal. Their lifespan is still somewhat impacted. They will not be like patients with simpler congenital heart diseases such as only a ventricular septal defect or atrial septal defect, who can achieve a natural lifespan. For these individuals, their lifespan is still impacted to some extent. As they age post-surgery, some complications may arise, including sudden death, and some may require a second surgery.