Anatomy and Pathophysiology
DORV occurs in a multiple forms, with variability of great artery position and size, as well as of ventricular septal defect (VSD) location. It can occur with or without transposition of the great arteries. The clinical manifestations are similarly variable, depending on how the anatomical defects affect the physiology of the heart, in terms of altering the normal flow of blood from the RV and left ventricle (LV) to the aorta and pulmonary artery. For example:
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- in DORV with a subaortic VSD, blood from the LV flows through the VSD to the aorta and blood from the RV flows mainly to the pulmonary artery, yielding physiology similar to Tetralogy of Fallot
- in DORV with a subpulmonic VSD (called Taussig-Bing syndrome), blood from the LV flows through the VSD to the pulmonary artery and blood from the RV flows mainly to the aorta, yielding physiology similar to Transposition of the Great Arteries
- but if there is pulmonic stenosis in addition, physiology resembles Tetralogy of Fallot
- in other forms of DORV, blood from both ventricles is substantially mixed in the RV, yielding physiology that resembles a large VSD
- but again, if there is pulmonic stenosis, physiology resembles Tetralogy of Fallot
Read more about this topic: Double Outlet Right Ventricle
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