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Subcortical P30 potential following tibial nerve stimulation: detection and normative data
1Servizio di Neurofisiopatologia, Istituto di Neurologia, Università degli Studi di Verona, Italy.
Italian Journal of Neurological Sciences
|December 1, 1995
Summary
This study validates the P30 far-field potential from tibial nerve stimulation for clinical use. The Fpz-Cv6 montage reliably records this potential, aiding in assessing somatosensory pathway conduction.
Area of Science:
- Neuroscience
- Clinical Electrophysiology
Background:
- The P30 far-field potential, evoked by tibial nerve stimulation, is thought to originate near the cervico-medullary junction.
- Clinical application of P30 recording has been limited due to uncertainty about its generator and consistent scalp recording reliability.
Purpose of the Study:
- To assess the reliability of scalp-recorded P30 far-field potentials evoked by tibial nerve stimulation.
- To identify an optimal recording montage for P30 potential detection.
Main Methods:
- Somatosensory Evoked Potentials (SEPs) were recorded from 34 healthy individuals.
- Various electrode montages were tested, with a focus on the Fpz-Cv6 derivation.
- The P30 potential's latency and signal-to-noise ratio were analyzed.
Main Results:
- The Fpz-Cv6 montage demonstrated the highest signal-to-noise ratio for P30 potential recording.
- A consistent P30 potential, peaking at 29.2 ± 1.6 ms, was recorded in all subjects.
- This montage facilitates reliable detection of the tibial nerve P30 potential.
Conclusions:
- The P30 far-field potential is reliably recordable on the scalp using the Fpz-Cv6 montage.
- This potential should be incorporated into routine tibial nerve SEP recordings.
- It allows for separate evaluation of spinal and intracranial somatosensory pathway conduction.