
The ventricular septum consists of an inferior muscular and superior membranous portion and is extensively innervated with conducting cardiomyocytes. The membranous portion, which is close to the atrioventricular node, is most commonly affected in adults and older children in the United States. It is also the type that will most commonly require s...
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http://en.wikipedia.org/wiki/Ventricular_septal_defect

opening in the partition between the two ventricles, or lower chambers, of the heart. Such defects are congenital and may be accompanied by other ... [2 related articles]
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http://www.britannica.com/eb/a-z/v/14

Ventricular septal defect (VSD) is a hole (defect) in the wall that separates the lower chambers of the heart. The lower chambers of the heart are called the ventricles. The wall between them is called the ventricular septum. In the normal heart, the septum prevents blood from flowing directly from ...
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http://www.daviddarling.info/encyclopedia/V/ventricular_septal_defect.html

<cardiology, embryology> A congenital heart defect where an abnormal opening exists in the ventricular septum. Blood flows from the higher pressure left ventricle (through the defect) into the right ventricle. ... (12 Jan 1998) ...
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http://www.encyclo.co.uk/local/20973

a congenital heart defect in which the opening in the ventricular septum (normal in the fetus) persists after birth, in either the muscular or fibrous portion, most often due to failure of the bulbar septum to completely close the interventricular foramen. This permits flow of blood directly from one ventricle to the othe...
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http://www.encyclo.co.uk/local/21001

Type: Term Definitions: 1. a congenital defect in the septum (membranous or muscular) between the cardiac ventricles, usually resulting from failure of the spiral aorticopulmonary septum to close the interventricular foramen.
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http://www.medilexicon.com/medicaldictionary.php?t=23165

One of the most common heart defects that presents at the time of birth, affecting approximately 1% of all babies. During fetal development, a wall will form in the fetus;s heart to separate the left and right ventricles. If the wall (septum) fails to form or does not form completely, one or more holes will remain, and will the baby will have a ven...
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http://www.pregnology.com/

[
n] - a common congenital heart defect
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http://www.webdictionary.co.uk/definition.php?query=ventricular%20septal%20

a hole in the wall that separates the two lower chambers of the heart (called the ventricles)
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https://www.encyclo.co.uk/local/20875
noun a common congenital heart defect; an abnormal opening in the septum dividing the ventricles allows blood to pass directly from the left to the right ventricle; large openings may cause congestive heart failure
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https://www.encyclo.co.uk/local/20974

an abnormal opening in the wall between the right and left ventricles.
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https://www.stanfordchildrens.org/en/topic/default?id=glossary---cardiovasc
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