Electrophysiological and Neuroimaging Correlates of the Effect of Zolpidem in Patients With Focal Dystonia

Summary

To study electrophysiological and imaging correlations of the clinical effectiveness of zolpidem in task-specific dystonia and to elucidate mechanisms underlying its therapeutic effects, patients with focal dystonia will be clinically evaluated and will undergo transcranial magnetic stimulation and FDG-PET CT brain imaging after a single 5 mg dose of zolpidem and placebo, in two separate sessions. Resting motor threshold (RMT), active motor threshold (AMT), resting and active input/output (IO) curve, short-interval intracortical inhibition (SICI) curve, long interval intracortical inhibition (LICI), intracortical facilitation (ICF), and cortical silent period (CSP) will be measured. Objective clinical improvement will be rated using Burke-Fahn-Marsden Dystonia Rating Scale-movement (BFM-M) and writer's cramp rating scale (WCRS). Subjective improvement will be measured using the visual analog scale (VAS). Only a subset of patients (10 patients) will undergo positron emission tomography with 18F-2-fluoro-2-deoxy-D-glucose (18F-FDG PET) brain imaging after a single 5 mg dose of zolpidem and placebo.

Timeline

Start

2017-09-30

Primary completion

2021-04-30

Completion

2021-04-30

Publications

• Background Lehericy S, Tijssen MA, Vidailhet M, Kaji R, Meunier S. The anatomical basis of dystonia: current view using neuroimaging. Mov Disord. 2013 Jun 15;28(7):944-57. doi: 10.1002/mds.25527.
• Background Kapogiannis D, Wassermann EM. Transcranial magnetic stimulation in Clinical Pharmacology. Cent Nerv Syst Agents Med Chem. 2008 Dec;8(4):234-240. doi: 10.2174/187152408786848076.
• Background Quartarone A, Hallett M. Emerging concepts in the physiological basis of dystonia. Mov Disord. 2013 Jun 15;28(7):958-67. doi: 10.1002/mds.25532.
• Background Thenganatt MA, Jankovic J. Treatment of dystonia. Neurotherapeutics. 2014 Jan;11(1):139-52. doi: 10.1007/s13311-013-0231-4.

Drugs

Indications