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The primary defect of the Tetralogy of Fallot heart is insufficient growth of the outlet of the right ventricle, the lower chamber of the right heart. Therefore the ventricular septum has a hole. These make the aorta displaced anteriorly. Finally, the right ventricular muscle is thickened as a result of longstanding obstruction of the right ventricular outflow tract. According to the narrowing of the right ventricular outflow, there is limitation of pulmonary blood flow, blood flow to the lung. Lower oxygenated blood that is sent to the lung is very limited so that the patient will be blue.

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Q: Anatomy and physiology of tetralogy of fallot?
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