Abstract
The objective of this study was to evaluate the diagnostic value of triple stimulation technique (TST) and diffusion tensor imaging (DTI) tractography as markers of upper motor neuron (UMN) degeneration in amyotrophic lateral sclerosis (ALS). Fourteen ALS patients fulfilling the El Escorial criteria and 30 control subjects participated in the study. TST amplitude and area ratio were used as an estimate of the degree of central motor conduction failure. DTI fractional anisotropy was used as a quantitative measure of the structural integrity of the corticospinal tract and the posterior limb of the internal capsule. Mean TST amplitude and area ratio were lower in patients than controls, while there were no differences in mean fractional anisotropy of the corticospinal tract or the posterior limb of the internal capsule. TST was abnormal in 7/13 patients (sensitivity 54 %) and DTI was abnormal in 3/12 (sensitivity 25 %). Combining TST and DTI disclosed abnormalities in 8/11 patients (sensitivity 73 %). TST confirmed UMN degeneration in one of every 2.25 patient in the diagnostic categories lower than ‘probable’ ALS. Using results from TST as a criterion for UMN degeneration, four patients in diagnostic categories lower than ‘probable’ ALS and without clinical signs of UMN degeneration in the cervical region increased in diagnostic category. Our findings indicate that TST has a significant diagnostic value as an early objective marker of UMN degeneration in ALS, while the value of DTI analysis seems limited.
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Abbreviations
- ADM:
-
Abductor digiti minimi muscle
- AI:
-
Asymmetry index
- ALS:
-
Amyotrophic lateral sclerosis
- ALSFRS-R:
-
Revised amyotrophic lateral sclerosis functional rating scale
- CMAP:
-
Compound muscle action potential
- CMCT:
-
Central motor conduction time
- CST:
-
Corticospinal tract
- DTI:
-
Diffusion tensor imaging
- DTR:
-
Deep tendon stretch reflex
- EMG:
-
Electromyography
- FA:
-
Fractional anisotropy
- FACT:
-
Fiber assignment by continuous tracking
- FEV(1):
-
Forced expiratory volume in the first second
- FVC:
-
Forced vital capacity
- ICBM:
-
International consortium for brain mapping
- LMN:
-
Lower motor neuron
- MD:
-
Mean diffusivity
- MEP:
-
Motor evoked potential
- MNI:
-
Montreal Neurological Institute
- MR:
-
Magnetic resonance
- MRC:
-
Medical research council
- PLIC:
-
Posterior limb of internal capsule
- ROI:
-
Region of interest
- sd:
-
Standard deviation
- TMS:
-
Transcranial magnetic stimulation
- TST:
-
Triple stimulation technique
- UMN:
-
Upper motor neuron
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Acknowledgments
This work was supported by the Lundbeck Foundation [R32-A2774]; the Danish Agency for Science, Technology and Innovation (founded by Danish Ministry of Science, Technology and Innovation) [271-06-0202] and Dagmar Marshalls Fond [5413455170]. These bodies had no role in the study design, implementation or manuscript preparation. The authors thank Per Christian Sidenius, MD and Bodil Holch Povlsen (Department of Neurology, Aarhus University) for their assistance with admission of patients, and research radiographers Dora Zeidler and Michael Geneser for their assistance with MRI recordings. We also thank following participants for patient inclusion: Carsten Bisgaard, MD (Neurology Department, Vejle Hospital); Mette-Kirstine Christensen, MD, PhD (Neurology Department, Aalborg Hospital, Aarhus University); Jens Arentsen, MD (Neurology Department, Holstebro Hospital). The authors thank all patients and control subjects who participated in the study.
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Furtula, J., Johnsen, B., Frandsen, J. et al. Upper motor neuron involvement in amyotrophic lateral sclerosis evaluated by triple stimulation technique and diffusion tensor MRI. J Neurol 260, 1535–1544 (2013). https://doi.org/10.1007/s00415-012-6824-8
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DOI: https://doi.org/10.1007/s00415-012-6824-8