Related Experiment Videos
Brain evoked potentials to noxious sural nerve stimulation in sciatalgic patients.
Jean Claude Wilier1, Thomas De Broucker, Anna Barranquero
1Laboratory of Clinical Neurophysiology, Faculty of Medicine Saint-Antoine, University of Paris VI, 27, rue Chaligny, F 75571 Paris Cedex 12, France Clinique Rhumatologique, UFR Xavier-Bichat, University of Paris VII, ParisFrance.
Pain
|July 1, 1987
Summary
Brain evoked potentials (BEP) in sciatica patients reveal that the Lasègue maneuver significantly alters N150-P220 amplitude. Pain induction on the affected side increases amplitude, while on the unaffected side, it decreases it.
Area of Science:
- Neuroscience
- Pain Research
- Clinical Electrophysiology
Background:
- Sciatica, often caused by disc herniation and nerve root compression, presents significant pain challenges.
- Brain Evoked Potentials (BEP) offer a non-invasive method to study central nervous system responses to sensory stimuli.
Purpose of the Study:
- To compare the N150-P220 amplitude of BEPs in sciatica patients under resting conditions versus neurologically induced pain.
- To investigate the effect of the Lasègue maneuver on BEP amplitude in both affected and unaffected limbs.
Main Methods:
- Eight sciatica patients with confirmed dorsal root compression underwent sural nerve stimulation.
- BEPs were recorded from the vertex, with stimulus intensity adjusted to elicit a liminal nociceptive reflex and pain.
- The Lasègue maneuver was performed on both affected and unaffected sides, with BEPs recorded during stimulation of both limbs.
Main Results:
- The Lasègue maneuver on the affected side significantly increased the N150-P220 amplitude.
- Performing the Lasègue maneuver on the normal (unaffected) side resulted in a significant decrease in N150-P220 amplitude.
- These amplitude variations were consistent regardless of the stimulated limb's side.
Conclusions:
- The Lasègue maneuver induces differential modulations of central pain processing in sciatica patients.
- Observed changes in BEP amplitude suggest complex neural mechanisms underlying sciatica and its response to provocative maneuvers.
- These findings may have implications for understanding pain mechanisms and potentially guiding clinical assessment in sciatica.