A randomised controlled comparison between stimulating and standard catheters for lumbar plexus block

Area of Science:

• Anesthesiology
• Regional Anesthesia

Background:

• Continuous lumbar plexus blocks are crucial for managing lower limb pain.
• Optimizing anesthetic volume and ensuring block success are key clinical challenges.

Purpose of the Study:

• To compare the efficacy of stimulating catheters versus standard catheters in reducing the minimum effective anesthetic volume (MEAV50) for lumbar plexus blocks.
• To evaluate the impact of stimulating catheters on the success rate of lumbar plexus blocks.

Main Methods:

• A randomized, prospective, blinded study involving 58 patients (ASA physical status 1-3).
• Patients received lumbar plexus blocks using either a stimulating or standard catheter with mepivacaine 1.5%.
• The up-and-down staircase method was used to determine MEAV50.

Main Results:

• The MEAV50 was significantly lower with stimulating catheters (12.2 ml) compared to standard catheters (24.8 ml) (p < 0.0001).
• Complete lumbar plexus block was achieved in 100% of patients with stimulating catheters versus 69% with standard catheters (p = 0.002).

Conclusions:

• Stimulating catheters effectively reduce the minimum effective anesthetic volume for lumbar plexus blocks by approximately 50%.
• The use of stimulating catheters enhances the success rate of continuous lumbar plexus blocks.