A comparison of stimulation patterns in axillary block: part 2

Area of Science:

• Anesthesiology
• Regional Anesthesia
• Peripheral Nerve Blocks

Background:

• Axillary block effectiveness is crucial for upper limb anesthesia.
• Previous studies suggest radial and musculocutaneous nerve stimulation are key.
• Direct comparisons with ulnar plus musculocutaneous nerve stimulation were lacking.

Purpose of the Study:

• To compare the extent of sensory and motor block.
• To evaluate radial plus musculocutaneous vs. ulnar plus musculocutaneous nerve stimulation in axillary blocks.
• To determine the optimal nerve stimulation combination for axillary brachial plexus block.

Main Methods:

• Sixty patients received axillary blocks with 40 mL 1.5% mepivacaine.
• Random assignment to radial plus musculocutaneous or ulnar plus musculocutaneous nerve stimulation.
• Sensory block assessed via pinprick at 5 and 20 minutes.

Main Results:

• No significant differences in anesthesia rates for most nerves.
• Radial nerve (90% vs. 63.3%) and medial cutaneous arm (73.3% vs. 93.3%) showed differences.
• Higher global sensory score with radial plus musculocutaneous stimulation (12 vs. 11).

Conclusions:

• Radial plus musculocutaneous nerve stimulation yields more extensive upper limb anesthesia.
• Neither combination represents an optimal choice for axillary brachial plexus block.
• Further research is needed to identify ideal nerve stimulation pairings.