HEMODYNAMIC-STUDY OF DIFFERENT ANGLED END-TO-SIDE ANASTOMOSES

This study assessed the postoperative microvascular hemodynamics in en d-to-side arterial anastomoses of varied angles in order to determine whether the angle of the anastomosis affects arterial flow, Thirty mal e rats were divided into three groups of ten. Carotid to carotid end-t o-side anastomoses were performed with anastomotic angles of 45, 90, a nd 135 degrees. Postoperative flow was assessed using high frequency p ulsed Doppler ultrasound (HFPDU) at 30 and 120 min postoperatively, Me asurements at 30 min demonstrated significant differences in flow, wit h the 45 degrees grafted vessels utilizing 56.5% of total carotid flow , and the 90 degrees and 135 degrees anastomoses appropriating 46.5% a nd 43.2% of flow, respectively (comparing 45 degrees to both 90 degree s, P < 0.05, and 135 degrees, P < 0.002). The change from baseline in 45 degrees and 90 degrees groups dissipated over a 2 hr postoperative period, but flow in the grafted vessels in the 135 degrees group conti nued well below 50% at 39.9% (comparing to both 45 degrees and 90 degr ees, P < 0.001), thereby displaying a significant difference in the po stoperative arterial flow of varied angled microanastomoses. (C) 1995 Wiley-Liss, Inc.