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In blue babies basically there are structural defects in the heart persistent ductus arteriosis, tetrology of fallot , transposition of graeat vessels.
Unoxygenated blood from the right ventricle flows into the aorta preferentially because of the obstructed outflow tract into the lungs. This means less blood has the opportunity to be oxygenated in the lungs. Blood mixes abnormally between the left and right ventricles and into the aorta. Oxygen gives blood its reddish color; cyanosis describes the "blueness" in the baby which results from the pumping of mixed oxygenated and unoxygenated blood throughout the body.
The severity of the condition is judged by the echocardiography and blood gas analysis.
Treatment involves surgical repair of the defcts.
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