What is bypass?

Bypass is a shunt; a diverted flow.
aortocoronary b. See coronary bypass.
cardiopulmonary b. Procedure in which the flow of blood is diverted from the heart
and lungs; performed to permit surgery within the heart, ascending aorta, or coronary arteries; venous blood normally emptying into the right atrium is diverted from the venae cavae to an extracorporeal circuit, passed through an oxygenator where gases are exchanged, and returned to the arterial circulation.
coronary b. The suturing of a tubular graft to the aorta and a coronary artery, circumventing a clogged portion of the coronary artery, thereby restoring circulation.

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