Blood flow in mobilized nerves: results in a rabbit sciatic nerve model

Area of Science:

• Neuroscience
• Vascular Biology
• Surgical Research

Background:

• Surgical mobilization of nerves is common in reconstructive procedures.
• Maintaining adequate nerve blood supply is critical for tissue viability and successful surgical outcomes.
• The impact of extensive nerve mobilization on capillary blood flow requires detailed investigation.

Purpose of the Study:

• To investigate the immediate effects of surgical mobilization on capillary blood flow in rabbit sciatic and tibial nerves.
• To determine the limits of nerve mobilization while preserving sufficient vascular supply.

Main Methods:

• Utilized radioactive microspheres to quantify capillary nerve blood flow in 37 rabbits.
• Divided rabbits into six groups, including controls, mobilized nerves, and mobilized/transected nerves.
• Assessed blood flow under various conditions, including intact, transected, and branch-dependent vascular supplies.

Main Results:

• Mobilization alone, leaving proximal and distal vascular supplies, increased blood flow in most segments.
• Distal transection decreased blood flow but was maintained up to a 1:63 diameter-to-length ratio.
• Nerve segments with intact branches showed significantly higher blood flow, highlighting the role of collateral circulation.

Conclusions:

• Extensive mobilization (up to 15 cm) of rabbit sciatic and tibial nerves is feasible while maintaining sufficient capillary blood flow.
• Nerve branches play a vital role in sustaining blood supply during mobilization.
• Findings support the potential for successful nerve transposition in surgical settings.