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"Blue baby" is an old-fashioned lay term for newborns with cyanotic heart defects. A cyanotic heart defect is one in which the patient is a bit blue in color (cyanotic) due to inadequate oxygenation of the blood. In cyanotic heart defects, this hypoxemia is due to inappropriate mixing of oxygenated and deoxygenated blood in the heart. One possible cause is the vetricular septal defect (sometimes abbreviated VSD); a lay term for a VSD is a "hole in the heart."

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12y ago

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