The Effect of Electrical Stimulation on Median Nerve Recovery After Repair in Rats

Area of Science:

• Neuroscience
• Regenerative Medicine
• Surgical Innovation

Background:

• Peripheral nerve injuries are common and can lead to significant functional deficits.
• Electrical stimulation (ES) has shown promise in accelerating nerve recovery in preclinical models.
• Previous studies indicated short durations of ES (≤10 minutes) were effective in murine models.

Purpose of the Study:

• To investigate if short-duration electrical stimulation (ES) accelerates functional and histological recovery in rats following median nerve transection and repair.
• To determine the efficacy of 1, 5, or 10 minutes of ES applied post-repair.

Main Methods:

• Median nerve transection and primary repair were performed in 28 male Sprague Dawley rats.
• Rats were randomized into four groups: three received ES (1, 5, or 10 minutes) and one control group received no ES.
• Functional recovery was assessed via grip strength for 8 weeks, followed by histological analysis of nerve and muscle tissue.

Main Results:

• No significant differences in grip strength were observed between groups receiving ES and the control group.
• Histological analysis revealed no significant difference in distal axon area in the ES treatment groups compared to the control.
• Axon area distal to the repair site was noted to be lower in control rats without ES, but this did not reach statistical significance in treatment groups.

Conclusions:

• Electrical stimulation (ES) of 1 to 10 minutes did not enhance functional or histological recovery of the median nerve after primary repair in a rat model.
• These findings suggest that short-duration ES may not be a beneficial adjunct for median nerve repair in this specific preclinical setting.