Atresia, anal


Atresia, anal: Congenital absence of an opening at the bottom end of the intestinal tract. Also called imperforate anus. Occurs in about 1 in 5,000 births. It is corrected by surgery.

Atresia refers to the absence of a normal opening.

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    Atresia, aortic: Congenital absence of the normal valvular opening from the left ventricle of the heart into the aorta. “Atresia” here refers to the absence of a normal opening.

  • Atresia, biliary

    Atresia, biliary: Congenital absence or closure of the major bile ducts, the ducts that drain bile from the liver. Biliary atresia results in a progressive inflammatory process which may lead to cirrhosis of the liver. The infant looks normal at birth but develops jaundice after the age of 2 to 3 weeks with yellowing of […]

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    Atrial flutter: Well-organized but overly rapid contractions of the atrium of the heart (usually at a rate of 250-350 contractions per minute). Flutter refers to a rapid vibration or pulsation. The difference between flutter and fibrillation is that flutter is well organized while fibrillation is not. Atrial flutter is a serious and potentially unstable rhythm […]

  • Atrial fibrillation

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