Spatiotemporal parameters for energy efficient kilohertz-frequency nerve block with low onset response.
Edgar Peña, Nicole A Pelot, Warren M Grill
PMID 37271812WHAT IT FOUND
In rat nerves, kilohertz block was most efficient at frequencies above the minimum blocking frequency.
Waveform shape and cuff geometry changed required current and initial excitation, but this was animal testing, not human therapy.
Key findings
01The lowest frequency that blocked was not the most efficient frequency; the median minimum blocking frequency was 7 kHz, while the median most efficient blocking frequency was 9 kHz and had lower block threshold.
02Monopolar cuffs had the lowest block threshold current below 14 kHz, and tripolar cuffs had lower block threshold current than bipolar cuffs above 14 kHz.
03The most efficient composite waveforms had lower block threshold (0.8x) and lower onset response (0.2x) than sinusoids at the same frequency.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study was done in anesthetized rats, not in people receiving therapy, so it cannot show patient benefit or safety. Each rat had only one cuff type, so cuff comparisons were made across different nerves rather than within the same nerve. The output measured was muscle force from motor fibers, not sensory, autonomic, or clinical function. Minimum blocking frequency could be uncertain because amplitude testing was limited to keep the experiment feasible and reduce muscle fatigue or signal loss. Nerve responses changed over hours, and the analysis did not correct for this drift.
Declared interests
The supplied text names National Institutes of Health funding and lists non-U.S. government and NIH extramural support.
The easy way to misread this
Do not read this as evidence that kilohertz nerve block can treat a patient. The work tested electrical block in anesthetized rats and measured muscle force, not clinical outcomes.