Right ventricular double outlet is not part of tetralogy of Fallot. Right ventricular double outlet is different from tetralogy of Fallot in terms of structural anomalies as well as the type of malformation. 1. Right ventricular double outlet: Right ventricular double outlet is a group of congenital heart malformations between tetralogy of Fallot and complete transposition of the great arteries. In patients with right ventricular double outlet, the aorta and pulmonary artery are abnormally positioned, and the two are often parallel, thus losing the normal pulmonary artery encompassing the aorta. Secondly, in patients with right ventricular double outlet, the two large arteries begin almost entirely in the right ventricle. 2. Tetralogy of Fallot: Tetralogy of Fallot has four main abnormalities: ventricular septal defect, pulmonary stenosis, aortic hiatus, and right ventricular hypertrophy. In Tetralogy of Fallot, the relationship between the aorta and the pulmonary artery is normal, with the main pulmonary artery wrapping around the short axis of the aorta. The majority of patients with Tetralogy of Fallot have an aortic ride of less than 75%. When patients experience discomfort, they need to go to the hospital immediately and follow the doctor’s instructions to avoid delays.