•An infant with a ventricular septal defect can have one or more holes in different places of the septum. There are several names for these holes. Some common locations and names are (see figure):
1•Conoventricular Ventricular Septal Defect
In general, this is a hole where portions of the ventricular septum should meet just below the pulmonary and aortic valves.
2•Perimembranous Ventricular Septal Defect
This is a hole in the upper section of the ventricular septum.
3•Inlet Ventricular Septal Defect
This is a hole in the septum near to where the blood enters the ventricles through the tricuspid and mitral valves. This type of ventricular septal defect also might be part of another heart defect called an atrioventricular septal defect (AVSD).
4•Muscular Ventricular Septal Defect
This is a hole in the lower, muscular part of the ventricular septum and is the most common type of ventricular septal defect.
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