Abstract
Objective: To investigate whether symptom development in motor neuron disease (MND) is a random or organized process. Methods: Six hundred patients with amyotrophic lateral sclerosis (ALS), upper motor neuron (UMN) or lower motor neuron (LMN) phenotypes were invited for a questionnaire concerning symptom development. A binomial test was used to examine distribution of symptoms from site of onset. Development of symptoms over time was evaluated by Kaplan-Meier analysis. Results: There were 470 respondents (ALS = 254; LMN = 100; UMN = 116). Subsequent symptoms were more often in the contralateral limb following unilateral limb onset (ALS: arms p = 1.05 × 10−8, legs p < 2.86 × 10−15; LMN phenotype: arms p = 6.74 × 10−9, legs p = 6.26 × 10−6; UMN phenotype: legs p = 4.07 × 10−14). In patients with limb onset, symptoms occurred significantly faster in the contralateral limb, followed by the other limbs and lastly by the bulbar region. Patterns of non-contiguous symptom development were also reported: leg symptoms followed bulbar onset in 30%, and bulbar symptoms followed leg onset in 11% of ALS patients. Conclusions: Preferred spread of symptoms from one limb to the contralateral limb, and to adjacent sites appears to be a characteristic of MND phenotypes, suggesting that symptom spread is organized, possibly involving axonal connectivity. Non-contiguous symptom development, however, is not uncommon, and may involve other factors.
| Original language | English |
|---|---|
| Pages (from-to) | 21-28 |
| Number of pages | 8 |
| Journal | Amyotrophic lateral sclerosis and frontotemporal degeneration |
| Volume | 19 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 2 Jan 2018 |
| Externally published | Yes |
Funding
R. Walhout reports no disclosures. E. Verstraete received a consultancy fee from Biogen Idec. MPvdH received a grant from The Netherlands Organization for Health Research and Development (Veni scheme), from the ALS Foundation Netherlands and from MQ. J.H. Veldink reports no disclosures. LHvdB received a grant from The Netherlands Organization for Health Research and Development (Vici scheme), travel grants and consultancy fees from Baxalta; serves on scientific advisory boards for Prinses Beatrix Spierfonds, Thierry Latran Foundation, Cytokinetics and Biogen. This study was supported by the ALS Foundation Netherlands, Prinses Beatrix Spierfonds, the European Community’s Health Seventh Framework Programme (grant agreement n° 259867), and the SOPHIA project (funded through the EU Joint Programme – Neurodegenerative Disease Research, JPND).
| Funders | Funder number |
|---|---|
| Netherlands Organization for Health Research and Development | |
| Fondation Thierry Latran | |
| EU Joint Programme – Neurodegenerative Disease Research | |
| Cytokinetics | |
| European Commission | |
| Prinses Beatrix Spierfonds | |
| Seventh Framework Programme | 259867 |
Keywords
- amyotrophic lateral sclerosis
- lower motor neuron
- Motor neuron disease
- symptom development
- upper motor neuron
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