Tetralogy of Fallot or TOF is a common congenital heart disease with 4 typical anatomical defects in the heart and the circulatory system. Here is a primer.
Congenital heart disease
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Atrial Septal defect or ASD is a form of congenital heart disease where there is an abnormal hole (opening) between two upper chambers of heart. This video explains the basics.
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Ventricular Septal Defect or VSD is the commonest form of congenital heart disease. Here is a primer.