Multi-parametric spinal cord MRI as potential progression marker in amyotrophic lateral sclerosis.

PLoS One 2014 22;9(4):e95516. Epub 2014 Apr 22.

Sorbonne Universités, UPMC Univ Paris 06, UM CR 2, Laboratoire d'Imagerie Biomédicale, Paris, Île-de-France, France; CNRS, UMR 7371, Laboratoire d'Imagerie Biomédicale, Paris, Île-de-France, France; INSERM, U 1146, Laboratoire d'Imagerie Biomédicale, Paris, Île-de-France, France; APHP, Groupe Hospitalier Pitié-Salpêtrière, Département des Maladies du système Nerveux, Paris, Île-de-France, France.

Objective: To evaluate multimodal MRI of the spinal cord in predicting disease progression and one-year clinical status in amyotrophic lateral sclerosis (ALS) patients.

Materials And Methods: After a first MRI (MRI1), 29 ALS patients were clinically followed during 12 months; 14/29 patients underwent a second MRI (MRI2) at 11±3 months. Cross-sectional area (CSA) that has been shown to be a marker of lower motor neuron degeneration was measured in cervical and upper thoracic spinal cord from T2-weighted images. Fractional anisotropy (FA), axial/radial/mean diffusivities (λ⊥, λ//, MD) and magnetization transfer ratio (MTR) were measured within the lateral corticospinal tract in the cervical region. Imaging metrics were compared with clinical scales: Revised ALS Functional Rating Scale (ALSFRS-R) and manual muscle testing (MMT) score.

Results: At MRI1, CSA correlated significantly (P<0.05) with MMT and arm ALSFRS-R scores. FA correlated significantly with leg ALFSRS-R scores. One year after MRI1, CSA predicted (P<0.01) arm ALSFSR-R subscore and FA predicted (P<0.01) leg ALSFRS-R subscore. From MRI1 to MRI2, significant changes (P<0.01) were detected for CSA and MTR. CSA rate of change (i.e. atrophy) highly correlated (P<0.01) with arm ALSFRS-R and arm MMT subscores rate of change.

Conclusion: Atrophy and DTI metrics predicted ALS disease progression. Cord atrophy was a better biomarker of disease progression than diffusion and MTR. Our study suggests that multimodal MRI could provide surrogate markers of ALS that may help monitoring the effect of disease-modifying drugs.

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Source
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0095516PLOS
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3995720PMC
January 2015
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(Supplied by CrossRef)
Research in amyotrophic lateral sclerosis: what is new in 2009?
PF Pradat et al.
Rev Neurol (Paris) 2010
Detection of corticospinal tract compromise in amyotrophic lateral sclerosis with brain MR imaging: relevance of the T1-weighted spin-echo magnetization transfer contrast sequence
Rocha da et al.
AJNR Am J Neuroradiol 2004

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