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Short latency trigeminal evoked potentials: normative data and clinical correlations.
J F Soustiel1, M Feinsod, H Hafner
1Department of Neurosurgery, Rambam Medical Center, Faculty of Medicine, Bat Galim, Haifa, Israel.
Electroencephalography and Clinical Neurophysiology
|March 1, 1991
Summary
Short latency trigeminal evoked potentials (STEP) reliably assess trigeminal system function. Abnormal STEPs in patients with trigeminal lesions correlated with clinical findings, aiding diagnosis and monitoring.
Area of Science:
- Neuroscience
- Clinical Electrophysiology
- Neurology
Background:
- The trigeminal nerve is crucial for facial sensation and motor function.
- Assessing trigeminal pathway integrity is vital for diagnosing neurological disorders.
- Short latency trigeminal evoked potentials (STEP) offer a potential method for evaluating these pathways.
Observation:
- Electrical stimulation of the upper lip elicits a 5-peak potential within 12 ms.
- Normative data were established from 25 healthy volunteers.
- Stimulus rate and intensity were analyzed for their impact on the response.
Findings:
- STEPs were consistently abnormal in patients with trigeminal system lesions (peripheral or brain-stem).
- Abnormalities in peak latencies and interpeak latency differences (IPLD) correlated with clinical and radiological findings.
- Improvements in STEPs were observed following lesion removal.
Implications:
- STEP is a reliable tool for evaluating both peripheral and central trigeminal pathways.
- STEP can serve as an additional parameter for assessing brain-stem function.
- This method aids in the diagnosis and monitoring of trigeminal pathway disorders.