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- W1984200312 abstract "Background and purpose Cortical hyperexcitability has been identified as an important pathogenic mechanism in motor neuron disease ( MND ). The issue as to whether cortical hyperexcitability is a common process across the MND phenotypes, including amyotrophic lateral sclerosis ( ALS ) and primary lateral sclerosis ( PLS ), remains unresolved. Separately, the clinical distinction between PLS and ‘mimic disorders’ such as hereditary spastic paraparesis ( HSP ) may be difficult, potentially delaying diagnosis. Consequently, the aim of the present study was to determine the nature and spectrum of cortical excitability changes across the MND phenotypes, and to determine whether the presence of cortical dysfunction distinguishes PLS from HSP . Methods Cortical excitability studies were undertaken on a cohort of 14 PLS , 82 ALS and 13 HSP patients with mutations in the spastin gene. Results Cortical hyperexcitability, as heralded by reduction of short interval intracortical inhibition ( PLS 0.26%, −3.8% to 1.4%; ALS −0.15%, −3.6% to 7.0%; P < 0.01) and cortical silent period duration ( CSP PLS 172.2 ± 5.4 ms; CSP ALS 178.1 ± 5.1 ms; P < 0.001), along with an increase in intracortical facilitation was evident in ALS and PLS phenotypes, although appeared more frequently in ALS. Inexcitability of the motor cortex was more frequent in PLS ( PLS 71%, ALS 24%, P < 0.0001). Cortical excitability was preserved in HSP . Conclusions Cortical dysfunction appears to be an intrinsic process across the MND phenotypes, with cortical inexcitability predominating in PLS and cortical hyperexcitability predominating in ALS . Importantly, cortical excitability was preserved in HSP , thereby suggesting that the presence of cortical dysfunction could help differentiate PLS from HSP in a clinical setting." @default.
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- W1984200312 date "2015-02-12" @default.
- W1984200312 modified "2023-09-25" @default.
- W1984200312 title "Cortical excitability changes distinguish the motor neuron disease phenotypes from hereditary spastic paraplegia" @default.
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- W1984200312 doi "https://doi.org/10.1111/ene.12669" @default.
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