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Simplified technique for recording human cortical & spinal evoked muscle potentials
R D Gursahani1, C D'souza, K Mansukhani
1Neurology Department, Sir J.J. Hospital, Bombay.
The Indian Journal of Medical Research
|August 1, 1990
Summary
This study measured central motor conduction time (CMCT) using transcranial stimulation in healthy volunteers. Corticospinal pathways to upper limbs showed reliable responses, allowing for CMCT calculation.
Area of Science:
- Neuroscience
- Motor Control
- Electrophysiology
Background:
- Transcranial stimulation is a key technique for assessing motor pathway integrity.
- Understanding central motor conduction time (CMCT) is crucial for diagnosing neurological disorders affecting motor pathways.
Purpose of the Study:
- To investigate the feasibility of measuring corticospinal excitability and conduction times in healthy volunteers.
- To determine central motor conduction time (CMCT) to upper and lower limb muscles.
Main Methods:
- Utilized a simplified Rossini's technique for transcranial motor cortex stimulation.
- Employed conventional electromyography (EMG) equipment and equipment.
- Measured latencies of corticomotor responses and peripheral conduction time (PCT) via spinal stimulation and F-responses.
Main Results:
- Consistently obtained cortical motor responses from the contralateral upper limb with tolerable stimuli.
- Observed inconsistent lower limb responses, sometimes requiring high stimulus strengths.
- Calculated corticomotor latencies for abductor pollicis brevis (APB), biceps, and tibialis anterior.
- Determined CMCT from cortex to C8/T1 segments (APB) and cortex to C5/C6 (biceps).
Conclusions:
- Transcranial stimulation is effective for assessing upper limb motor pathways in healthy individuals.
- Peripheral conduction time (PCT) can be reliably estimated using spinal stimulation and F-responses.
- The developed method allows for the calculation of central motor conduction time (CMCT).