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Related Experiment Video

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Motor cortical function determines prognosis in sporadic ALS.

Kazumoto Shibuya1, Susanna B Park1, Nimeshan Geevasinga1

  • 1From the Brain and Mind Centre (K.S., S.B.P., J.H., W.H., Y.-i.N., M.C.K.), Westmead Clinical School (N.G., P.M., S.V.), and Discipline of Pathology (J.J.K.), Sydney Medical School, University of Sydney; St. Vincent's Clinical School (N.G.S.), Prince of Wales Clinical School (W.H.), and Dementia Research Unit, School of Medical Sciences (L.M.I.), University of New South Wales (J.H., G.H.), Sydney; Clem Jones Centre for Ageing Dementia Research, Queensland Brain Institute (J.G.), The University of Queensland; and Neuroscience Research Australia (L.M.I., J.H., G.H.), Sydney, Australia.

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Summary

Reduced cortical inhibition in amyotrophic lateral sclerosis (ALS) patients predicts shorter survival. This cortical dysfunction, specifically reduced short interval intracortical inhibition (SICI), indicates hyperexcitability and a poorer prognosis.

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Area of Science:

  • Neuroscience
  • Neurology
  • Biomedical Engineering

Background:

  • Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease affecting motor neurons.
  • Understanding prognostic markers is crucial for managing ALS progression and patient outcomes.

Purpose of the Study:

  • To investigate the relationship between cortical function and patient survival in amyotrophic lateral sclerosis (ALS).

Main Methods:

  • Assessed cortical function using threshold tracking transcranial magnetic stimulation, measuring short interval intracortical inhibition (SICI) in 169 sporadic ALS patients.
  • Combined electrophysiological data with clinical measures and longitudinal prognostic factors, including ALS Functional Rating Scale-Revised (ALSFRS-R).

Main Results:

  • Patients with ALS exhibited reduced SICI compared to healthy controls.
  • Reduced averaged SICI, rapid vital capacity decline, and rapid ALSFRS-R decline were independently associated with shorter survival in multivariate analysis.
  • Cortical dysfunction, indicated by reduced SICI, was linked to a poorer prognosis within two years of disease onset.

Conclusions:

  • Cortical dysfunction, specifically reduced SICI suggesting intracortical hyperexcitability, serves as a prognostic marker in early-stage ALS.
  • These findings highlight the potential of cortical excitability measures for predicting ALS progression.