atrial septal defect

      congenital opening in the partition between the two upper chambers (atria) of the heart. The most common atrial septal defect is persistence of the foramen ovale, an opening in this partition that is normal before birth and that normally closes at birth or shortly thereafter. The opening in the atrial septum results in the flow of blood from the left atrium to the right, causing enlargement of the right atrium and ventricle and of the main pulmonary artery. The usual treatment, the surgical closure of the defect, is sometimes made hazardous by serious disease of the pulmonary vessels.

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Universalium. 2010.

Look at other dictionaries:

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  • atrial septal defect — ASD a congenital defect of the heart in which there is a hole in the partition (septum) separating the two atria (see septal defect). There are two kinds of ASD – ostium primum and ostium secundum. Ostium primum defects are rarer but more serious …   The new mediacal dictionary

  • atrial septal defect — noun an abnormal opening between the left and right atria of the heart • Hypernyms: ↑septal defect …   Useful english dictionary

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  • Дефект Межпредсердной Перегородки (Atrial Septal Defect, Asd) — см. Дефект перегородки. Источник: Медицинский словарь …   Медицинские термины

  • septal defect — a hole in the partition (septum) between the left and right halves of the heart. This abnormal communication is congenital due to an abnormality of heart development in the fetus. It may be found between the two atria (see atrial septal defect)… …   Medical dictionary

  • septal defect — a hole in the partition (septum) between the left and right halves of the heart. This abnormal communication is congenital due to an abnormality of heart development in the fetus. It may be found between the two atria (see atrial septal defect)… …   The new mediacal dictionary

  • septal defect — noun a congenital abnormality in the septum between the left and right sides of the heart • Hypernyms: ↑congenital heart defect • Hyponyms: ↑atrial septal defect, ↑ventricular septal defect …   Useful english dictionary

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