Hemodynamic study of different angled end-to-side anastomoses

Area of Science:

• Vascular Surgery
• Hemodynamics
• Microsurgery

Background:

• End-to-side arterial anastomoses are critical in microsurgery.
• Anastomotic angle is a potential factor influencing microvascular hemodynamics.
• Optimizing flow is essential for graft patency and surgical success.

Purpose of the Study:

• To investigate the effect of varied anastomotic angles on postoperative microvascular hemodynamics.
• To determine if the angle of end-to-side arterial anastomoses influences arterial flow.
• To identify optimal anastomotic angles for improved blood flow.

Main Methods:

• Thirty male rats underwent carotid to carotid end-to-side arterial anastomoses.
• Three groups were established with anastomotic angles of 45, 90, and 135 degrees.
• High frequency pulsed Doppler ultrasound (HFPDU) assessed postoperative arterial flow at 30 and 120 minutes.

Main Results:

• At 30 minutes, the 45-degree group showed significantly higher flow (56.5%) compared to 90 (46.5%) and 135 degrees (43.2%).
• Flow differences between angles were statistically significant (P < 0.05 to P < 0.001).
• The 135-degree group exhibited persistently low flow (<50%) at 120 minutes, indicating sustained hemodynamic compromise.

Conclusions:

• Anastomotic angle is a critical determinant of postoperative arterial flow in end-to-side microanastomoses.
• A 45-degree angle promotes superior microvascular hemodynamics compared to 90 and 135 degrees.
• Surgical technique, specifically anastomotic angulation, directly influences hemodynamic outcomes in vascular reconstructions.