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  1. The palmo-mental reflex in Vibroacoustic disease.

    Article - En anglais

    Background 

    Vibroacoustic disease (VAD), is a multisystemic nosological entity, caused by occupational exposure to large pressure amplitude (>= 90 dB SPL) and low frequency (<= 500 Hz) (LPALF) noise.

    The most common neurological finding in patients with VAD is the palmo-mental reflex (PMR).

    The aim of this study is to evaluate the frequency and characteristics of this primitive reflex in a population of VAD patients.

    Methods 

    Sixty individuals, occupationally exposed to LPALF noise underwent a neurological examination.

    In each one, unilateral contraction of the chin muscles was triggered through the stimulation of the thenar eminence.

    When a response habituation was observed, or when there was no response except previously existing skin retraction and small dimples, an EMG was performed.

    All these subjects also received brain MRI and measurement of endogenous evoked potentials.

    Results 

    Thirty individuals presented unilateral or bilateral PMR ; 26 of these presented changes in the brain MRI.

    EMG measurement evidenced continuous contraction of the chin muscles, without visible PMR, triggered by the stimulation of the thenar eminence.

    Conclusion 

    PMR is present in 50% of the patients with VAD.

    In the VAD patients, the frequency of abnormal chin muscle activity is higher than the frequency of PMR and represents a loss of the cortical control over the brainstem structures.

    Mots-clés Pascal : Bruit, Basse fréquence, Vibration, Nuisance acoustique, Réflexe palmomentonnier, Exposition professionnelle, Industrie aéronautique, Potentiel évoqué, Traumatisme, Dyskinésie buccofaciale, Agent physique, Aviation pathologie, Médecine aérospatiale, Facteur milieu, Médecine travail, Système nerveux pathologie, Trouble neurologique, Mouvement involontaire, Extrapyramidal syndrome, Homme

    Mots-clés Pascal anglais : Noise, Low frequency, Vibration, Noise pollution, Palmomental reflex, Occupational exposure, Aeronautic industry, Evoked potential, Trauma, Buccofacial dyskinesia, Physical agent, Aviation medicine, Space medicine, Environmental factor, Occupational medicine, Nervous system diseases, Neurological disorder, Involuntary movement, Extrapyramidal syndrome, Human

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 99-0253206

    Code Inist : 002B16M. Création : 16/11/1999.