Clinical Research Directory

Brain Networks in Dystonia

To date, there is only limited knowledge about the distinct neural abnormalities that lead to the development of different forms of focal dystonia. The goal of this study is to dissect the pathophysiological mechanisms underlying this clinical phenomenon using multi-level brain network analysis in patients with focal dystonia.

Characterization of Clinical Phenotypes of Laryngeal Dystonia and Voice Tremor

The researchers will systematically evaluate current and novel clinical voice assessment tools and measures to elucidate distinct clinical phenotypes of those with laryngeal dystonia and voice tremor.

Understanding Disorder-specific Neural Pathophysiology in Laryngeal Dystonia and Voice Tremor

The researchers will examine functional neural correlates that differentiate between laryngeal dystonia and voice tremor and contribute to disorder-specific pathophysiology using a cross-disciplinary approach of multimodal brain imaging.

Deep Brain Stimulation in Laryngeal Dystonia and Voice Tremor

The goals of this project are 1) to determine the incidence of neurological voice disorders in patients with dystonia and essential tremor undergoing deep brain stimulation (DBS), 2) investigate the neuroimaging and intracranial neurophysiology correlates of voice dysfunction in these subjects, and subsequently 3) determine the effects of DBS on voice function.

Extended-release Sodium Oxybate (Lumryz) in Spasmodic Dysphonia and Voice Tremor

Using a comprehensive approach of clinico-behavioral testing and neuroimaging, the researchers will examine the clinical effects of the extended-release formulation of sodium oxybate on voice symptoms in spasmodic dysphonia in an open-label, proof-of-concept, dose-finding study.

Spasmodic Dysphonia Interviews

Previous research has shown that patients with voice disorders often have a lower quality of life and struggle with employment. Spasmodic Dysphonia (SD) is a voice disorder that causes abrupt and uncontrollable spasms of the voice box, often resulting in the person having lifelong changes in their voice and speech pattern. The current mainstay of treatment is injecting botulinum toxin (BT) injections into the vocal cord to ease the spasms. The same research team conducted a pilot study in April 2021 on patients with SD. The pilot study used questionnaires and short interviews to understand the livelihood of 10 SD patients. It displayed that SD may impact patients' quality of life. The investigators now aim to run an official research project, ethically approved, to explore the following questions further: 1. Does SD impact the socio-economic lives of its patients? If so, how? 2. What role does BT play in the socio-economic livelihood of SD patients? To answer these questions, the investigators aim to interview 20 patients with Spasmodic Dysphonia.

Assessment of Laryngopharyngeal Sensation: Cancer Survivor Cohort

A previous study completed in 2022 (NCT05158179) was conducted using cohorts of healthy controls, and adults with general laryngopharyngeal disorders. This study will expand on the previous research to include a separate cohort of adults being seen in clinic for an existing laryngopharyngeal disorder resulting from previous radiation or other cancer treatments.

Zinc Supplementation Prior to Botox Injections for Spasmodic Dysphonia

One initial study has shown that Botulinum Toxin (BT) in combination with zinc supplementation may increase the duration of effects BT treatment. This initial study was in the context of facial aesthetics. The purpose of the present study is to determine the effect, if any, of oral zinc supplementation prior to BT in the treatment of spasmodic dysphonia. If positive effects will be observed, this would help reduce the burden of disease for these patients.