Comparison of two neurostimulation techniques for axillary brachial plexus blockade

Area of Science:

• Anesthesiology
• Regional Anesthesia
• Peripheral Nerve Blocks

Background:

• Axillary brachial plexus block is a common anesthetic technique.
• Optimizing block efficacy and onset is crucial for patient outcomes.
• Peripheral nerve stimulation is a standard tool for guiding block placement.

Purpose of the Study:

• To compare the efficacy of a single-injection versus a double-injection technique for axillary brachial plexus block.
• To evaluate the impact of injection technique on sensory and motor blockade characteristics.

Main Methods:

• Prospective, randomized, double-blind study involving 60 patients.
• Two groups: Group 1 (single injection) and Group 2 (double injection divided between median and radial nerves).
• Both groups received an initial musculocutaneous nerve block with 30 ml of lidocaine with epinephrine.
• Peripheral nerve stimulator used for guidance in both techniques.

Main Results:

• Complete sensory blockade was achieved in 53% of Group 1 vs. 97% of Group 2 patients (P<0.001).
• Complete motor blockade was achieved in 30% of Group 1 vs. 83% of Group 2 patients (P<0.001).
• Group 2 demonstrated a significantly more rapid onset of blockade compared to Group 1 (P<0.001).

Conclusions:

• The double-injection technique for axillary brachial plexus block is superior to the single-injection technique.
• This technique results in higher rates of complete sensory and motor blockade and faster onset.
• The findings support the double-injection method for improved regional anesthesia effectiveness.