perimembranous, the commonest defect, occurs when the membranous septum is deficient. It can extend into the outlet, muscular or inlet septum.
inlet - occurs on the septum between the insertion of the papillary muscles and the tricuspid annulus.
subarterial - there is deficiency of the septum immediately below and supporting the semilunar valves. A subarterial defect may be complicated by progressive aortic regurgitation.
muscular - the defect is in the muscular septum. This may be acquired secondary to myocardial infarction or trauma.
ventricular septal defect with overriding arterial valve is seen in complex congenital heart disease such as tetralogy of Fallot.
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