This operation was undertaken in the 1940's by a surgeon called Glenn.
It is used to treat blue babies. The superior vena cava draining blood
from the head and the upper part of the body was stitched directly to
the lung artery increasing the amount of blood flow to the lungs.
It later underwent a modification and now has three names - cavo-pulmonary
shunt, bi-directional Glenn shunt or a Kawashima operation. All mean the
same thing and improve the blood flowing to the lungs thereby making the