Right inferior pulmonary vein
Vena pulmonalis dextra inferior
Definition
The right inferior pulmonary vein is one of the four major pulmonary veins that drains oxygenated blood from the right lung to the left atrium of the heart. It collects blood from the lower and middle portions of the right lung with three main branches:
In the typical anatomical pattern (present in approximately 70-82% of individuals), the right inferior pulmonary vein exists as a separate ostium alongside the right superior pulmonary vein end empties into the posteroinferior aspect of the left atrium.The mean ostial diameter is approximately 13.7-17.1 mm, making it comparable in size to the other major pulmonary veins.
However, the right inferior pulmonary vein has a notably shorter distance to its first bifurcation (mean 7.0-11.0 mm from the ostium) compared to left-sided pulmonary veins, with early branching occurring in 66-99% of cases. This characteristic multiple ramification pattern may explain why this vein is less frequently a source of arrhythmogenic activity in atrial fibrillation.
Anatomical variations are common on the right side. The middle lobe vein typically drains into the right superior pulmonary vein (83.5%), but in approximately 5.5-9.6% of cases it drains into the right inferior pulmonary vein instead. Less commonly, the right inferior and superior veins may share a common ostium, or there may be supernumerary right pulmonary veins present.
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