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Modified Spared Nerve Injury Surgery Model of Neuropathic Pain in Mice

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A comparison of two approaches to sciatic nerve block.

A W Kilpatrick¹, D M Coventry, J G Todd

¹Division of Anaesthesia, Western Infirmary, Glasgow.

|February 1, 1992

Summary

The posterior approach for sciatic nerve block demonstrated higher success rates (95%) compared to the popliteal fossa approach (45%) for foot surgery. Both methods showed similar onset and duration, but the posterior approach is recommended.

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Electrophysiological Methods to Assess Peripheral Pain Block in an Anesthetized Rat

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Area of Science:

Anesthesiology
Surgical Procedures

Background:

Sciatic nerve blocks are crucial for lower limb surgery.
Choosing the optimal approach is essential for efficacy and patient comfort.

Purpose of the Study:

To compare the efficacy and outcomes of posterior versus popliteal fossa approaches for sciatic nerve blocks.

Main Methods:

Randomized comparison of 40 patients undergoing foot surgery.
Sciatic nerve blocks performed using posterior (n=20) or popliteal fossa (n=20) approaches.
Utilized peripheral nerve stimulator and standardized local anesthetic (bupivacaine with adrenaline).

Main Results:

The posterior approach achieved significantly higher success rates (19/20) than the popliteal fossa approach (9/20; p<0.01).
No significant differences were observed in block onset time or duration between the two groups.
Popliteal fossa approach resulted in less procedural discomfort but required more supplementary blocks.

Conclusions:

The posterior approach is recommended for sciatic nerve blocks due to its superior success rate.
While the popliteal fossa approach offers comfort, its lower efficacy necessitates further interventions.