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Superconditioning TMS for examining upper motor neuron function in MND

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Abstract

We used transcranial magnetic stimulation (TMS) of motor cortex, including a novel four-pulse superconditioning (TMSsc) paradigm, in repeated examinations of motor-evoked potentials (MEPs) in eight subjects with motor neuron disease (MND), including seven with amyotrophic lateral sclerosis (ALS). The goals were: (1) to look for evidence of cortical hyperexcitability, including a reduction in short-interval intracortical inhibition (SICI); and (2) to examine the utility of using TMSsc for quantifying upper motor neuron function during MND progression. Testing of abductor pollicis brevis (APB) and tibialis anterior (TA) muscles bilaterally was carried out every 3 months in MND subjects for up to 2 years; results were compared to those from a cohort of 15 control subjects. Measures of SICI were not significantly different between control and MND subjects for either APB or TA muscles. Other measures of cortical excitability, including TMS threshold and MEP amplitude, were consistent with lowered cortical excitability in MND subjects. Certain combinations of superconditioning TMS were capable of causing stronger inhibition or facilitation of MEPs compared to dual-pulse TMS, for both APB and TA target muscles. Moreover, there were multiple cases in which target muscles unresponsive to strong single-pulse TMS, whether at rest or when tested with an active contraction, showed an MEP in response to TMSsc optimized for facilitation. Our findings suggest that a multi-faceted neurophysiologic protocol for examining upper motor neuron function in MND subjects might benefit from inclusion of TMSsc testing.

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Authors and Affiliations

  1. Department of Neurosurgery, Upstate Medical University, 750 E. Adams St, Syracuse, NY, 13210, USA

    Blair Calancie & Natalia Alexeeva

  2. Department of Neurology, Upstate Medical University, 750 E. Adams St, Syracuse, NY, 13210, USA

    Eufrosina Young

  3. Clinical Research Initiatives, Upstate Medical University, 750 E. Adams St, Syracuse, NY, 13210, USA

    Mary Lou Watson

  4. Department of Public Health and Preventive Medicine, Upstate Medical University, 750 E. Adams St, Syracuse, NY, 13210, USA

    Dongliang Wang

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  1. Blair Calancie
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Correspondence to Blair Calancie.

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Calancie, B., Young, E., Watson, M.L. et al. Superconditioning TMS for examining upper motor neuron function in MND. Exp Brain Res 237, 2087–2103 (2019). https://doi.org/10.1007/s00221-019-05573-4

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