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Tracking motor neuron loss in a set of six muscles in amyotrophic lateral sclerosis using the Motor Unit Number Index (MUNIX): a 15-month longitudinal multicentre trial
Kantonsspital St Gallen, ALS Clin, Neuromuscular Dis Unit, CH-9007 St Gallen, Switzerland..
Med Coll Wisconsin, Milwaukee, WI 53226 USA..
Kantonsspital St Gallen, ALS Clin, Neuromuscular Dis Unit, CH-9007 St Gallen, Switzerland..
Univ Lisbon, Fac Med, Hosp Santa Maria, Dept Neurosci,Inst Med Mol, P-1699 Lisbon, Portugal..
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2015 (engelsk)Inngår i: Journal of Neurology, Neurosurgery and Psychiatry, ISSN 0022-3050, E-ISSN 1468-330X, Vol. 86, nr 11, s. 1172-1179Artikkel i tidsskrift (Fagfellevurdert) Published
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Abstract [en]

Background Motor Unit Number Index (MUNIX) is a novel neurophysiological measure that provides an index of the number of functional lower motor neurons in a given muscle. So far its performance across centres in patients with amyotrophic lateral sclerosis (ALS) has not been investigated. Objective To perform longitudinal MUNIX recordings in a set of muscles in a multicentre setting in order to evaluate its value as a marker of disease progression. Methods Three centres applied MUNIX in 51 ALS patients over 15 months. Six different muscles (abductor pollicis brevis, abductor digiti minimi, biceps brachii, tibialis anterior, extensor dig. brevis, abductor hallucis) were measured every 3 months on the less affected side. The decline between MUNIX and ALSFRS-R was compared. Results 31 participants reached month 12. For all participants, ALSFRS-R declined at a rate of 2.3%/month. Using the total score of all muscles, MUNIX declined significantly faster by 3.2%/month (p <= 0.02). MUNIX in individual muscles declined between 2.4% and 4.2%, which differed from ASLFRS-R decline starting from month 3 (p <= 0.05 to 0.002). Subgroups with bulbar, lower and upper limb onset showed different decline rates of ALSFRS-R between 1.9% and 2.8%/month, while MUNIX total scores showed similar decline rates over all subgroups. Mean intraclass correlation coefficient for MUNIX intra-rater reliability was 0.89 and for inter-rater reliability 0.80. Conclusion MUNIX is a reliable electrophysiological biomarker to track lower motor neuron loss in ALS.

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2015. Vol. 86, nr 11, s. 1172-1179
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URN: urn:nbn:se:uu:diva-269982DOI: 10.1136/jnnp-2015-310509ISI: 000364994100198PubMedID: 25935892OAI: oai:DiVA.org:uu-269982DiVA, id: diva2:885589
Tilgjengelig fra: 2015-12-19 Laget: 2015-12-19 Sist oppdatert: 2018-01-10bibliografisk kontrollert

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