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November 1980

Flow Disturbance at the Distal End-to-Side Anastomosis: Effect of Patency of the Proximal Outflow Segment and Angle of Anastomosis

Author Affiliations

From the Vascular Dynamics Laboratory, Division of Surgery, Boston University Medical Center, and the Naval Blood Research Laboratory, Boston.

Arch Surg. 1980;115(11):1280-1284. doi:10.1001/archsurg.1980.01380110028004

• We investigated the flow disturbance that occurs at the distal end-to-side anastomosis. Clear plastic model end-to-side anastomoses were constructed with inlet angles of 15° and 45°. Flow patterns were visualized with steady and pulsatile flow using a dye-injection technique. Multiple lateral pressure measurements were made in the region of the anastomosis. A laser Doppler anemometer was used to measure near-wall velocity. Flow disturbance was minimal when the inlet angle was low and the proximal outflow segment occluded. Patency of the proximal outflow segment or a high inlet angle may result in areas of boundary-layer separation, with corresponding adverse pressure gradients at the anastomosis. These separation regions are characterized by low near-wall velocity, which may contribute to anastomotic hyperplasia.

(Arch Surg 115:1280-1284, 1980)

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