Exploring Your Heart’s Electrical Conduction
Your heart has four chambers, four valves, two nodes, and a system of fibers known as the His-Purkinje system. The four chambers consist of two atria (upper chambers) and two ventricles (lower chambers). Your four valves consist of a tricuspid valve, pulmonary valve, mitral valve, and aortic valve.
The tricuspid and mitral [...]

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How Congenital Heart Defects Are Diagnosed
If a congenital heart defect is severe (for example, as in the case of tetralogy of Fallot), it will likely be diagnosed when a mother-to-be is pregnant. If it is not diagnosed during pregnancy, there is a high likelihood that it will be detected within weeks after she gives birth [...]

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