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- 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.
Last reviewed 01/2018