Bidirectional Glenn shunt. Connecting the SVC to the RPAThe venous blood from the head and upper limbs will pass directly to the lungs, bypassing the right ventricle. The venous blood from the lower half of the body however will continue to enter the heart.. . How is a BDG helpful. 1.Improving oxygen saturation as compared to the pre-operative state.2.Decreases volume load (to RA,RV) 3.Low-pressure shunt, it does not carry the risk of causing lung blood vessel thickening and hardening..
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