An operation in which a surgeon creates a new tubular pathway for the movement of fluids and/or other substances in the body.
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1. A shunt or auxiliary flow. 2. To create new flow from one structure to another through a diversionary channel. SEE ALSO: shunt.
- aortoiliac b. an operation in which a vascular prosthesis is united with the aorta and iliac artery to relieve obstruction of the lower abdominal aorta, its bifurcation, and the proximal iliac branches.
- aortorenal b. a vascular prosthesis of synthetic material, autologous tissue, or heterologous tissue that circumvents and obstruction of the renal artery.
- bowel b. SYN: jejunoileal b..
- cardiopulmonary b. diversion of the blood flow returning to the heart through a pump oxygenator (heart-lung machine) and then returning it to the arterial side of the circulation; used in operations upon the heart to maintain extracorporeal circulation.
- coronary artery b. conduit, usually a vein graft or internal mammary artery, surgically interposed between the aorta and a coronary artery branch to coronary shunt blood beyond an obstruction. SYN: aortocoronary b..
- extra-anatomic b. a vascular b. that does not conform to the preexisting anatomy.
- extracranial-intracranial b. a vascular shunt created by the anastomosis of an extracranial vessel to an intracranial vessel, usually, the superficial temporal artery to a cortical branch of the middle cerebral artery.
- femoropopliteal b. a vascular prosthesis of synthetic material, autologous tissue, or heterologous tissue that circumvents an obstruction in the femoral artery.
- gastric b. high division of the stomach, anastomosis of the small upper pouch of the stomach to the jejunum, and closure of the distal part of the stomach that is retained; used for treatment of severe obesity.
- jejunoileal b. anastomosis of the upper jejunum to the terminal ileum for treatment of severe obesity. SYN: bowel b., jejunoileal shunt.
- left heart b. any procedure that shunts blood returning from the pulmonary circulation to the systemic circulation without passing through the left heart. This is utilized during some cardiac surgery and experimentally during severe left heart failure or cardiogenic shock.
- partial ileal b. division of the small intestine approximately 100 cm proximal to the ileocecal valve, closure of the distal end, and anastomosis of the proximal end to the cecum.
- right heart b. introduction of a circuit shunting blood from the venae cavae around the right atrium and ventricle and directly into the pulmonary artery.

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by·pass 'bī-.pas n a surgically established shunt <cardiopulmonary \bypass of blood from the right atrium to the aorta> also a surgical procedure for the establishment of a shunt see CORONARY BYPASS, gastric bypass, JEJUNOILEAL BYPASS
bypass vt

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a surgical procedure to divert the flow of blood or other fluid from one anatomical structure to another; a shunt. A bypass can be temporary or permanent and is commonly performed in the treatment of cardiac and gastrointestinal disorders. See also cardiopulmonary bypass, coronary bypass graft.

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by·pass (biґpas) 1. an auxiliary channel, such as around a blocked segment in the circulatory system or alimentary tract; see also shunt (def. 2). 2. surgical creation of such a channel.

Medical dictionary. 2011.

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