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Related Experiment Videos

Evoked potential abnormalities in myotonic dystrophy.

D S Thompson, J B Woodward, S P Ringel

    Electroencephalography and Clinical Neurophysiology
    |November 1, 1983
    PubMed
    Summary

    Brain stem auditory evoked potentials (BAEPs) reveal significant central nervous system involvement in myotonic dystrophy (MYD), particularly in males. These findings provide neurophysiological evidence of brain stem pathology in MYD patients.

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    Area of Science:

    • Neuroscience
    • Neurology
    • Genetics

    Background:

    • Myotonic dystrophy (MYD) is a multisystem disorder.
    • Previous studies suggest central nervous system (CNS) involvement in MYD, evidenced by EEG abnormalities and cognitive impairments.
    • Brain stem auditory evoked potentials (BAEPs) and median nerve somatosensory evoked potentials (MSSEPs) have not been previously reported in MYD.

    Purpose of the Study:

    • To investigate brain stem auditory evoked potentials (BAEPs) and median nerve somatosensory evoked potentials (MSSEPs) in patients with myotonic dystrophy (MYD).
    • To provide neurophysiological evidence of central nervous system (CNS) involvement, specifically brain stem pathology, in MYD.

    Main Methods:

    • Evaluated 15 patients with myotonic dystrophy (MYD) using BAEPs and MSSEPs.

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  • Analyzed interwave latencies for BAEPs (wave I-III, III-V) and thalamic complex (P15-N19) for MSSEPs.
  • Assessed correlations between evoked potential abnormalities, patient age, sex, and clinical findings.

    • Main Results:

    • Abnormal BAEPs were observed in 53.3% of MYD patients (P < 0.05), indicating brain stem dysfunction (pons and midbrain).
    • Abnormal MSSEPs (13.3%) showed thalamic complex delays, despite normal clinical sensory exams and peripheral nerve conduction.
    • A significant sex difference was noted: 8/9 males had abnormal evoked potentials, versus 0/6 females.

    Conclusions:

    • Abnormal BAEPs provide strong neurophysiological evidence for brain stem pathology in myotonic dystrophy (MYD).
    • While MSSEP findings were not statistically significant, they suggest potential thalamic involvement.
    • The higher incidence of abnormalities in males warrants further investigation into sex-related differences in MYD neuropathology.