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A new indirect method for measuring spinal conduction velocity in man.

A Eisen, K Burton, A Larsen

Electroencephalography and Clinical Neurophysiology

|June 1, 1984

Summary

This study introduces a new non-invasive method to measure spinal cord conduction using reflex responses. The technique provides a reliable conduction velocity of 57.9 m/sec for spinal cord pathways.

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Area of Science:

Neuroscience
Physiology
Biomedical Engineering

Background:

Assessing spinal cord conduction is crucial for diagnosing neurological disorders.
Current methods can be invasive or lack precision in measuring mixed afferent-efferent pathways.

Observation:

A novel non-invasive technique was developed to elicit and measure late reflex responses (R1 and R2).
These reflexes were recorded from thenar and tibialis anterior muscles following stimulation of median and common peroneal nerves.
Distinct mean onset latencies were observed for R1 (27.5-30.6 ms) and R2 (46.0-65.1 ms) reflexes.

Findings:

The study successfully measured spinal cord conduction time between C7 and L5 spinous processes as 7.95 ms.
Calculated mean conduction velocity in the spinal cord was 57.9 +/- 5.7 m/sec.

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R1 reflex characteristics resemble the H-reflex, while R2 represents a long-loop reflex with a potentially shared supraspinal pathway.

Implications:

This method offers a non-invasive alternative for evaluating spinal cord function and integrity.
It has potential applications in clinical settings for diagnosing and monitoring spinal cord injuries and diseases.
Further research can elucidate the precise pathways of the R2 reflex and its clinical utility.