Abstract
Hand dystonia is a common complication of Wilson’s disease (WD), responsible for handwriting difficulties and disability. Alteration of sensorimotor integration and overactivity of the somatosensory cortex have been demonstrated in dystonia. This study investigated the immediate after effect of an inhibitory repetitive transcranial magnetic stimulation (rTMS) applied over the somatosensory cortex on the writing function in WD patients with hand dystonia. We performed a pilot prospective randomized double-blind sham-controlled crossover rTMS study. A 20-min 1-Hz rTMS session, stereotaxically guided, was applied over the left somatosensory cortex in 13 WD patients with right dystonic writer’s cramp. After 3 days, each patient was crossed-over to the alternative treatment. Patients were clinically evaluated before and immediately after each rTMS session with the Unified Wilson’s Disease rating scale (UWDRS), the Writers’ Cramp Rating Scale (WCRS), a specifically designed scale for handwriting difficulties in Wilson’s disease patients (FAR, flow, accuracy, and rhythmicity evaluation), and a visual analog scale (VAS) for handwriting discomfort. No significant change in UWDRS, WCRS, VAS, or FAR scores was observed in patients treated with somatosensory inhibitory rTMS compared to the sham protocol. The FAR negatively correlated with UWDRS (r = −0.6; P = 0.02), but not with the WCRS score, disease duration, MRI diffusion lesions, or with atrophy scores. In our experimental conditions, a single inhibitory rTMS session applied over somatosensory cortex did not improve dystonic writer cramp in WD patients.
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Acknowledgements
Funding sources for the study: French Ministry of Health, Programme Hospitalier de Recherche Clinique, and Assistance Publique des Hôpitaux de Paris (CIRC P121105). We are grateful to Mr. Loïc Bruyser for technical support.
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PL received consultancies fees from ‘CSL Behring’, travel grants from ‘CSL Behring’, and ‘LFB biomedicaments’ and speaker honoraria from ‘Astellas’. AP received consultancies fees from ‘Univar’, travel grants from ‘Merz’ and ‘Allergan’, and speaker honoraria from ‘Univar’. EM declares that she has no conflict of interest. SM received financial support from ‘humanair medical’ to attend SFRMS meeting, and financial support from ‘Sanofi’ to attend “Les Rencontres de Neurologie” meeting. TPM declares that he has no conflict of interest. EV received consultancies fees and/or speaker honoraria from ‘Bayer Health care’, ‘Bristol-Myers Squibb’, ‘Daiichi-Sankyo’, ‘Johnson&Johnson’, ‘Innothera’, and ‘Pfizer’.AP received consultancies fees from Univar, travel grants from Merz and speaker honoraria from Univar. EH declares that he has no conflict of interest. FW declares that she has no conflict of interest. JMT received consultancies fees from ‘Allergan’ and ‘Aguettant’. JPG declares that he has no conflict of interest. NK received financial support from ‘CSL Behring’ to attend SFN meeting.
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Lozeron, P., Poujois, A., Meppiel, E. et al. Inhibitory rTMS applied on somatosensory cortex in Wilson’s disease patients with hand dystonia. J Neural Transm 124, 1161–1170 (2017). https://doi.org/10.1007/s00702-017-1756-1
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DOI: https://doi.org/10.1007/s00702-017-1756-1