Tetralogy of Fallot By Lee B Beerman, MD, Children's Hospital of Pittsburgh of the University of Pittsburgh School of Medicine Reviewed / Revised Apr 2023 View Patient Education Pathophysiology Symptoms and Signs Diagnosis Treatment Key Points More Information Topic Resources Tetralogy of Fallot Modified Blalock-Taussig-Thomas... Medications for Hypercyanotic... Overview of Tetralogy of... Tetralogy of Fallot consists of 4 features: a large ventricular septal defect, right ventricular outflow tract obstruction and pulmonic valve stenosis, right ventricular hypertrophy, and over-riding of the aorta.