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[Nociceptive threshold and Parkinson disease].

R Guieu¹, J Pouget, G Serratrice

¹Clinique des Maladies du Système Nerveux et de l'Appareil Locomoteur, CHU Timone, Marseille.

Revue Neurologique

|January 1, 1992

Summary

Parkinson disease patients often have higher pain thresholds, measurable by the RIII reflex. Naloxone administration normalized pain thresholds in some cases, suggesting opioid system involvement in Parkinsonian pain.

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Area of Science:

Neuroscience
Pain Research
Clinical Neurology

Background:

Parkinson disease is frequently associated with painful phenomena.
Assessing pain thresholds in Parkinson disease is challenging due to associated depressive symptoms.
The leg flexion nociceptive reflex (RIII reflex) provides a quantifiable measure of pain thresholds.

Purpose of the Study:

To evaluate pain thresholds in individuals with Parkinson disease.
To investigate the utility of the RIII reflex in assessing pain perception in Parkinson disease.
To explore potential mechanisms underlying altered pain thresholds in Parkinson disease.

Main Methods:

Utilized the RIII reflex (leg flexion nociceptive reflex) to measure pain thresholds.
Compared pain thresholds between Parkinson disease patients and an age-matched control group.
Administered naloxone to a subset of patients to assess its effect on pain thresholds.

Main Results:

A higher pain threshold was observed in 8 out of 10 Parkinson disease patients compared to controls.
Naloxone injection resulted in the normalization of pain thresholds in 2 of the affected patients.
These findings suggest a potential alteration in the endogenous opioid system in Parkinsonian pain.

Conclusions:

The RIII reflex is a viable method for assessing pain thresholds in Parkinson disease.
Parkinson disease patients may exhibit elevated pain thresholds, possibly linked to opioid system dysfunction.
Naloxone's effect indicates a potential role for endogenous opioids in modulating pain perception in Parkinson disease.

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