Accelerated TMS for Focal Hand Dystonia

The primary aim of this research is to investigate the impact of transcranial magnetic stimulation (TMS) on both brain function and behavioral outcomes among individuals suffering from focal hand dystonia. A preliminary examination of a previous TMS study carried out by our team revealed that the application of TMS, using personalized, fMRI-guided brain targeting and interleaved TMS delivery during motor tasks, has the potential to modify brain activity and ameliorate dystonic behavior after a single session of TMS in patients with focal hand dystonia. This present study seeks to build upon these promising findings by administering four TMS sessions in a single day, interspersed with four rest intervals, a protocol referred to as "accelerated TMS." The investigation will consist of a total of eight in-person appointments. Participants with focal hand dystonia will receive accelerated TMS during two in-person visits. Following each TMS session, participants will evaluate changes in brain function and behavior. During the assessment visits, individuals will undergo functional MRI brain scans and engage in writing tasks on an electronic tablet. The principal risk associated with TMS is the possibility of inducing a seizure. However, this study will strictly adhere to safety guidelines, utilizing TMS levels that have not previously been linked to seizures in properly screened individuals. Notably, the dosages of TMS proposed for use in this study have not caused seizures in healthy volunteers. To further mitigate the risk of seizures, potential subjects will undergo medical screening for any known factors that could predispose them to seizures. The primary advantage of this study lies in its potential to enhance dystonic behavior in patients with focal hand dystonia, while also deepening our comprehension of the foundational changes in brain function before and after TMS intervention for focal hand dystonia. The discoveries stemming from this investigation will pave the way for future research endeavors aimed at advancing brain stimulation as a viable clinical therapy for focal hand dystonia.

Inclusion criteria

• 18yrs and older
• Diagnosed with isolated focal hand by Neurologist
• Right-hand dominant
• Must be able to sign an informed consent
• Must be literate

Exclusion criteria

• Other neurological movement disorders diagnoses including other types of dystonia, Parkinsonism, or essential tremor
• History of seizure disorder
• Concomitant medications are known to decrease seizure threshold
• Illicit drug use
• No TMS therapy for another indication within one month of this research study
• Botulinum toxin injections within 3months of the research study
• Medications used for symptom treatment of dystonia including anticholinergic, benzodiazepines, and muscle relaxants among others within one month of the study
• No physical or occupational therapy of the hand within one month of the study
• Any contraindications to MRI or TMS