Peripheral Neuromodulation to Treat Postamputation Pain.

Area of Science:

• Neurology
• Pain Management
• Biomedical Engineering

Background:

• Postamputation stump and phantom pain are common, disabling conditions that are difficult to treat.
• Traditional peripheral neuromodulation can cause paresthesia, limiting its effectiveness.
• A novel approach using high-frequency alternating current (HFAC) nerve block has been developed.

Purpose of the Study:

• To evaluate the efficacy of HFAC block for treating postamputation pain.
• To assess the impact of HFAC block on analgesic use.
• To compare HFAC block with other pain management modalities.

Main Methods:

• A 10-patient pilot study was conducted using surgically implanted peripheral nerve cuff electrodes.
• HFAC block was applied to block nerve action potentials without causing paresthesia.
• Pain levels and analgesic intake were recorded before and after treatment.

Main Results:

• Average pain scores decreased from 5.7 to 1.4 (out of 10).
• 85% of sessions resulted in >50% pain reduction.
• Significant reduction in opioid and analgesic use was observed, with patients stopping or decreasing intake.
• HFAC block provided the most significant pain reduction compared to other modalities.

Conclusions:

• HFAC block is a promising investigational therapy for postamputation pain, including phantom limb pain.
• This technique effectively reduces pain and analgesic dependence without paresthesia.
• Further pivotal trials are planned pending FDA clearance for wider market availability.