Cervical DystoniaNCT03471923
Non-Motor Features of Cervical Dystonia (CD)
An observational study of Cervical Dystonia and Movement Disorders, run by Vanderbilt University Medical Center at 1 site in United States.
Trial summary
This study will examine the prevalence of four previously identified non-motor markers in a population of cervical dystonia patients, unaffected family members, and healthy volunteers in an attempt to identify a distinct combination of non-motor symptoms that may be indicative of disease development. Read more about this study
- Who is it for?
- Ages 18 years and olderHealthy volunteers can take part
- Conditions the study is for
- Cervical Dystonia, Movement Disorders, Focal Dystonia
- What is being tested?
- Neurological Examination and Assessment of Non-Motor Features
- How many people
- 33 participants
- Where
- 1 siteUnited States
- Study dates
- 26 Mar 2018to 2 Dec 2019
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Study population: Participants in this study will include adults that have cervical dystonia, are healthy and related to someone with cervical dystonia, or are healthy and not related to someone with cervical dystonia (control group).
Who may be able to join
- Have a diagnosis of cervical dystonia, OR a first order relation of a Vanderbilt patient diagnosed with cervical dystonia, OR a healthy volunteer who is neurologically normal
- Capable of participating in all study procedures
- Willing and able to provide written or verbal informed consent.
Who cannot join
- Subjects for whom participation in the study may cause medical harm
- Subjects who are not considered competent to make their own medical decisions
- Subjects who display sensory deficits during a short screening examination prior to study enrollment
Trial locations and contacts
1 site in 1 country.
United States1 site
Vanderbilt University Medical Center Clinical Research Center
Nashville, Tennessee, 37232
About this study
Official title: Non-Motor Features of Cervical Dystonia
This study will examine the prevalence of four previously identified non-motor markers in a population of cervical dystonia patients, unaffected family members, and healthy volunteers in an attempt to identify a distinct combination of non-motor symptoms that may be indicative of disease development.
Read the detailed description
The primary aim of this study is to identify the prevalence of four previously identified non-motor markers - (1) spatial discrimination threshold, (2) temporal discrimination threshold, (3) vibration-induced illusion of movement, and (4) kinesthesia - in a population of cervical dystonia patients, unaffected family members, and healthy volunteers (control group). Consenting participants will receive a neurological examination performed by a movement disorders neurologist, followed by an assessment of the four non-motor symptoms.
The investigators hypothesize that a distinct combination of non-motor symptoms will be more prevalent in the CD group, and therefore this set of symptoms may be indicative of disease development. This combination will be identified through analysis of the concurrence of the non-motor features across the three groups of participants. This study will fill an important unmet need, as to the investigators' knowledge there are no published studies assessing the comorbid presentation of these four non-motor symptoms in a single cervical dystonia population. The exploration of a distinct combination of concurrent non-motor symptoms as a marker for the development of cervical dystonia will improve the ability of movement disorders neurologists to diagnose the condition.
The results of this study will facilitate the investigators' longstanding aim of improving rates of cervical dystonia diagnosis. Cervical dystonia is currently diagnosed based upon the exclusion of other movement disorders; therefore, characterization of non-motor features in cervical dystonia patients will help to refine the diagnostic criteria for this condition. This investigation will also improve understanding of the factors associated with CD. Future studies can examine the source of these associated factors in order to help understand the cause of CD, since the etiology is currently unknown.
- Conditions
- Cervical Dystonia, Movement Disorders, Focal Dystonia, Signs and Symptoms, Nervous System Diseases, Neurologic Manifestations
- Being tested
- Neurological Examination, Assessment of Non-Motor Features
- Medical subject headings
- Torticollis, Movement Disorders, Dystonic Disorders, Signs and Symptoms, Nervous System Diseases, Neurologic Manifestations, Neuromuscular Manifestations
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Neurological ExaminationDiagnostic test
The family members and healthy volunteers will undergo elements of the neurological examination during which the movement disorders neurologist will look specifically for the presence of cervical dystonia and other sensory abnormalities. If the subject is found to have cervical dystonia or any other sensory abnormalities, the subject will be excluded from the study.
Assessment of Non-Motor FeaturesDiagnostic test
All subjects will be assessed for four non-motor symptoms, including (1) spatial discrimination threshold, (2) temporal discrimination threshold, (3) vibration-induced illusion of movement, and (4) kinesthesia.
| Study group | Role | What they receive |
|---|---|---|
| CD Patients | Subjects must have a prior diagnosis of cervical dystonia and be capable of participating in all study procedures. Subjects will undergo assessment of non-motor features. Receives: Diagnostic Test: Assessment of Non-Motor Features | |
| Family Members | Subjects must be a first order relation of a Vanderbilt patient diagnosed with cervical dystonia. The subject must pass a short neurological examination to ensure the subject does not have cervical dystonia or any sensory deficits. Subjects will undergo assessment of non-motor features. Receives: Diagnostic Test: Neurological Examination; Diagnostic Test: Assessment of Non-Motor Features | |
| Healthy volunteers | Subjects must be healthy volunteers who are neurologically normal. The subject must pass a short neurological examination to ensure the subject does not have cervical dystonia or any sensory deficits. Subjects will undergo assessment of non-motor features. Receives: Diagnostic Test: Neurological Examination; Diagnostic Test: Assessment of Non-Motor Features |
What is being measured
The primary outcome is the main question the study is designed to answer.
Prevalence of spatial discrimination threshold in cervical dystonia patients, unaffected family members, and healthy volunteers
For participants in all groups, the investigators will examine the prevalence of spatial discrimination threshold. Prevalence of spatial discrimination threshold will be determined with a task using Johnson-Van-Boven-Phillips (JVP) domes. The spatial discrimination threshold will be recorded as the mean of both hands at the 75% level of accuracy. The research coordinator will report prevalence of spatial discrimination threshold as a descriptive statistic.
Measured: Up to 6 months after consent is obtained
Prevalence of temporal discrimination threshold in cervical dystonia patients, unaffected family members, and healthy volunteers
For participants in all groups, the investigators will examine the prevalence of temporal discrimination threshold. Prevalence of temporal discrimination threshold will be determined with a visual-visual discrimination task.The research coordinator will report prevalence of temporal discrimination threshold as a descriptive statistic.
Measured: Up to 6 months after consent is obtained
Prevalence of vibration-induced illusion of movement in cervical dystonia patients, unaffected family members, and healthy volunteers
For participants in all groups, the investigators will examine the prevalence of vibration-induced illusion of movement. Prevalence of vibration-induced illusion of movement will be determined by recording the change in displacement of the tracking arm during a vibration-induced illusion of movement task. The research coordinator will report prevalence of vibration-induced illusion of movement as a descriptive statistic.
Measured: Up to 6 months after consent is obtained
Prevalence of impaired kinesthesia in cervical dystonia
For participants in all groups, the investigators will examine the prevalence of impaired kinesthesia. Kinesthesia will be determined by a neurologist during the neurological examination. The research coordinator will report prevalence of impaired kinesthesia as a descriptive statistic.
Measured: Up to 6 months after consent is obtained
Secondary outcomes (1)
Probability of concurrence of multiple non-motor features
The concurrence of multiple non-motor symptoms will be assessed using a multinomial logistic regression model to determine if a distinct combination of non-motor symptoms is more prevalent in the cervical dystonia patient group than in the unaffected family members or healthy volunteer groups.
Measured: Up to 6 months after consent is obtained
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted21 Mar 2018
- Study start26 Mar 2018
- Primary completion2 Dec 2019
- Study completion2 Dec 2019
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (17)Papers the sponsor has linked to this study.
- Other trials for Cervical DystoniaStudies of the same condition, open and under way.
- More trials run by Vanderbilt University Medical CenterThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Cohort
- Time perspective
- Cross-sectional
- Enrolment
- 33 participants (actual)
Sponsor and investigators
- Lead sponsor
- Vanderbilt University Medical Center
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Mallory Hacker, Vanderbilt University Medical Center
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT03471923
- Sponsor's protocol ID
- 171717
- Status last verified
- Feb 2020
- First submitted
- 23 Feb 2018
- Last updated
- 7 Feb 2020
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Publications
Crowner BE. Cervical dystonia: disease profile and clinical management. Phys Ther. 2007 Nov;87(11):1511-26. doi: 10.2522/ptj.20060272. Epub 2007 Sep 18.
PubMed 17878433Stacy M. Epidemiology, clinical presentation, and diagnosis of cervical dystonia. Neurol Clin. 2008 May;26 Suppl 1:23-42. doi: 10.1016/s0733-8619(08)80003-5. No abstract available.
PubMed 18603166Jinnah HA, Berardelli A, Comella C, Defazio G, Delong MR, Factor S, Galpern WR, Hallett M, Ludlow CL, Perlmutter JS, Rosen AR; Dystonia Coalition Investigators. The focal dystonias: current views and challenges for future research. Mov Disord. 2013 Jun 15;28(7):926-43. doi: 10.1002/mds.25567.
PubMed 23893450Stamelou M, Edwards MJ, Hallett M, Bhatia KP. The non-motor syndrome of primary dystonia: clinical and pathophysiological implications. Brain. 2012 Jun;135(Pt 6):1668-81. doi: 10.1093/brain/awr224. Epub 2011 Sep 20.
PubMed 21933808Bradley D, Whelan R, Kimmich O, O'Riordan S, Mulrooney N, Brady P, Walsh R, Reilly RB, Hutchinson S, Molloy F, Hutchinson M. Temporal discrimination thresholds in adult-onset primary torsion dystonia: an analysis by task type and by dystonia phenotype. J Neurol. 2012 Jan;259(1):77-82. doi: 10.1007/s00415-011-6125-7. Epub 2011 Jun 8.
PubMed 21656045Chen H, Zhao EJ, Zhang W, Lu Y, Liu R, Huang X, Ciesielski-Jones AJ, Justice MA, Cousins DS, Peddada S. Meta-analyses on prevalence of selected Parkinson's nonmotor symptoms before and after diagnosis. Transl Neurodegener. 2015 Jan 8;4(1):1. doi: 10.1186/2047-9158-4-1. eCollection 2015.
PubMed 25671103Frima N, Nasir J, Grunewald RA. Abnormal vibration-induced illusion of movement in idiopathic focal dystonia: an endophenotypic marker? Mov Disord. 2008 Feb 15;23(3):373-7. doi: 10.1002/mds.21838.
PubMed 18044715Molloy FM, Carr TD, Zeuner KE, Dambrosia JM, Hallett M. Abnormalities of spatial discrimination in focal and generalized dystonia. Brain. 2003 Oct;126(Pt 10):2175-82. doi: 10.1093/brain/awg219. Epub 2003 Jun 23.
PubMed 12821512Fiorio M, Gambarin M, Valente EM, Liberini P, Loi M, Cossu G, Moretto G, Bhatia KP, Defazio G, Aglioti SM, Fiaschi A, Tinazzi M. Defective temporal processing of sensory stimuli in DYT1 mutation carriers: a new endophenotype of dystonia? Brain. 2007 Jan;130(Pt 1):134-42. doi: 10.1093/brain/awl283. Epub 2006 Nov 14.
PubMed 17105745Bradley D, Whelan R, Walsh R, O'Dwyer J, Reilly R, Hutchinson S, Molloy F, Hutchinson M. Comparing endophenotypes in adult-onset primary torsion dystonia. Mov Disord. 2010 Jan 15;25(1):84-90. doi: 10.1002/mds.22889.
PubMed 19938165Westenberger A, Klein C. Genetics of dystonia. In: Dystonia and Dystonic Syndromes. ; 2015:27-48. doi:10.1007/978-3-7091-1516-9_3.
Putzki N, Stude P, Konczak J, Graf K, Diener HC, Maschke M. Kinesthesia is impaired in focal dystonia. Mov Disord. 2006 Jun;21(6):754-60. doi: 10.1002/mds.20799.
PubMed 16482525Walsh R, O'Dwyer JP, Sheikh IH, O'Riordan S, Lynch T, Hutchinson M. Sporadic adult onset dystonia: sensory abnormalities as an endophenotype in unaffected relatives. J Neurol Neurosurg Psychiatry. 2007 Sep;78(9):980-3. doi: 10.1136/jnnp.2006.105585.
PubMed 17702779Bradley D, Whelan R, Walsh R, Reilly RB, Hutchinson S, Molloy F, Hutchinson M. Temporal discrimination threshold: VBM evidence for an endophenotype in adult onset primary torsion dystonia. Brain. 2009 Sep;132(Pt 9):2327-35. doi: 10.1093/brain/awp156. Epub 2009 Jun 12.
PubMed 19525326Klingelhoefer L, Martino D, Martinez-Martin P, et al. Nonmotor symptoms and focal cervical dystonia: Observations from 102 patients. Basal Ganglia. 2014;4(3-4):117-120. doi:10.1016/j.baga.2014.10.002.
Study at a glance
From the registry record, last updated by the sponsor on 7 Feb 2020. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Non-Motor Features of Cervical Dystonia
- ClinicalTrials.gov ID
- NCT03471923
- Acronym / sponsor ID
- 171717
- Conditions
- Cervical Dystonia, Movement Disorders, Focal Dystonia, Signs and Symptoms, Nervous System Diseases, Neurologic Manifestations
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 33 participants (actual)
- Lead sponsor
- Vanderbilt University Medical CenterUniversity, hospital or other
- Study start
- 26 Mar 2018 (actual)
- Primary completion
- 2 Dec 2019 (actual)
- Study completion
- 2 Dec 2019 (actual)
- First posted
- 21 Mar 2018 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This study will examine the prevalence of four previously identified non-motor markers in a population of cervical dystonia patients, unaffected family members, and healthy volunteers in an attempt to identify a distinct combination of non-motor symptoms that may be indicative of disease development.
Detailed description
The primary aim of this study is to identify the prevalence of four previously identified non-motor markers - (1) spatial discrimination threshold, (2) temporal discrimination threshold, (3) vibration-induced illusion of movement, and (4) kinesthesia - in a population of cervical dystonia patients, unaffected family members, and healthy volunteers (control group). Consenting participants will receive a neurological examination performed by a movement disorders neurologist, followed by an assessment of the four non-motor symptoms.
The investigators hypothesize that a distinct combination of non-motor symptoms will be more prevalent in the CD group, and therefore this set of symptoms may be indicative of disease development. This combination will be identified through analysis of the concurrence of the non-motor features across the three groups of participants. This study will fill an important unmet need, as to the investigators' knowledge there are no published studies assessing the comorbid presentation of these four non-motor symptoms in a single cervical dystonia population. The exploration of a distinct combination of concurrent non-motor symptoms as a marker for the development of cervical dystonia will improve the ability of movement disorders neurologists to diagnose the condition.
The results of this study will facilitate the investigators' longstanding aim of improving rates of cervical dystonia diagnosis. Cervical dystonia is currently diagnosed based upon the exclusion of other movement disorders; therefore, characterization of non-motor features in cervical dystonia patients will help to refine the diagnostic criteria for this condition. This investigation will also improve understanding of the factors associated with CD. Future studies can examine the source of these associated factors in order to help understand the cause of CD, since the etiology is currently unknown.
Study design
- Observational model
- Cohort
- Time perspective
- Cross-sectional
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| CD Patients | – | Diagnostic Test: Assessment of Non-Motor FeaturesSubjects must have a prior diagnosis of cervical dystonia and be capable of participating in all study procedures. Subjects will undergo assessment of non-motor features. |
| Family Members | – | Diagnostic Test: Neurological Examination, Diagnostic Test: Assessment of Non-Motor FeaturesSubjects must be a first order relation of a Vanderbilt patient diagnosed with cervical dystonia. The subject must pass a short neurological examination to ensure the subject does not have cervical dystonia or any sensory deficits. Subjects will undergo assessment of non-motor features. |
| Healthy volunteers | – | Diagnostic Test: Neurological Examination, Diagnostic Test: Assessment of Non-Motor FeaturesSubjects must be healthy volunteers who are neurologically normal. The subject must pass a short neurological examination to ensure the subject does not have cervical dystonia or any sensory deficits. Subjects will undergo assessment of non-motor features. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
- Study population
- Participants in this study will include adults that have cervical dystonia, are healthy and related to someone with cervical dystonia, or are healthy and not related to someone with cervical dystonia (control group).
Key inclusion criteria (3 listed)
- Have a diagnosis of cervical dystonia, OR a first order relation of a Vanderbilt patient diagnosed with cervical dystonia, OR a healthy volunteer who is neurologically normal
- Capable of participating in all study procedures
- Willing and able to provide written or verbal informed consent.
Key exclusion criteria (3 listed)
- Subjects for whom participation in the study may cause medical harm
- Subjects who are not considered competent to make their own medical decisions
- Subjects who display sensory deficits during a short screening examination prior to study enrollment
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Neurological ExaminationThe family members and healthy volunteers will undergo elements of the neurological examination during which the movement disorders neurologist will look specifically for the presence of cervical dystonia and other sensory abnormalities. If the subject is found to have cervical dystonia or any other sensory abnormalities, the subject will be excluded from the study. | Diagnostic test | Family Members, Healthy volunteers |
| Assessment of Non-Motor FeaturesAll subjects will be assessed for four non-motor symptoms, including (1) spatial discrimination threshold, (2) temporal discrimination threshold, (3) vibration-induced illusion of movement, and (4) kinesthesia. | Diagnostic test | CD Patients, Family Members, Healthy volunteers |
Primary outcome
Prevalence of spatial discrimination threshold in cervical dystonia patients, unaffected family members, and healthy volunteers
Time frame: Up to 6 months after consent is obtained
For participants in all groups, the investigators will examine the prevalence of spatial discrimination threshold. Prevalence of spatial discrimination threshold will be determined with a task using Johnson-Van-Boven-Phillips (JVP) domes. The spatial discrimination threshold will be recorded as the mean of both hands at the 75% level of accuracy. The research coordinator will report prevalence of spatial discrimination threshold as a descriptive statistic.
Prevalence of temporal discrimination threshold in cervical dystonia patients, unaffected family members, and healthy volunteers
Time frame: Up to 6 months after consent is obtained
For participants in all groups, the investigators will examine the prevalence of temporal discrimination threshold. Prevalence of temporal discrimination threshold will be determined with a visual-visual discrimination task.The research coordinator will report prevalence of temporal discrimination threshold as a descriptive statistic.
Prevalence of vibration-induced illusion of movement in cervical dystonia patients, unaffected family members, and healthy volunteers
Time frame: Up to 6 months after consent is obtained
For participants in all groups, the investigators will examine the prevalence of vibration-induced illusion of movement. Prevalence of vibration-induced illusion of movement will be determined by recording the change in displacement of the tracking arm during a vibration-induced illusion of movement task. The research coordinator will report prevalence of vibration-induced illusion of movement as a descriptive statistic.
Prevalence of impaired kinesthesia in cervical dystonia
Time frame: Up to 6 months after consent is obtained
For participants in all groups, the investigators will examine the prevalence of impaired kinesthesia. Kinesthesia will be determined by a neurologist during the neurological examination. The research coordinator will report prevalence of impaired kinesthesia as a descriptive statistic.
1 secondary outcome
Probability of concurrence of multiple non-motor features
Time frame: Up to 6 months after consent is obtained
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 7 Feb 2020.
- Background: PubMed 17878433Crowner BE. Cervical dystonia: disease profile and clinical management. Phys Ther. 2007 Nov;87(11):1511-26. doi: 10.2522/ptj.20060272. Epub 2007 Sep 18.
- Background: PubMed 18603166Stacy M. Epidemiology, clinical presentation, and diagnosis of cervical dystonia. Neurol Clin. 2008 May;26 Suppl 1:23-42. doi: 10.1016/s0733-8619(08)80003-5. No abstract available.
- Background: PubMed 23893450Jinnah HA, Berardelli A, Comella C, Defazio G, Delong MR, Factor S, Galpern WR, Hallett M, Ludlow CL, Perlmutter JS, Rosen AR; Dystonia Coalition Investigators. The focal dystonias: current views and challenges for future research. Mov Disord. 2013 Jun 15;28(7):926-43. doi: 10.1002/mds.25567.
- Background: PubMed 21933808Stamelou M, Edwards MJ, Hallett M, Bhatia KP. The non-motor syndrome of primary dystonia: clinical and pathophysiological implications. Brain. 2012 Jun;135(Pt 6):1668-81. doi: 10.1093/brain/awr224. Epub 2011 Sep 20.
- Background: PubMed 21656045Bradley D, Whelan R, Kimmich O, O'Riordan S, Mulrooney N, Brady P, Walsh R, Reilly RB, Hutchinson S, Molloy F, Hutchinson M. Temporal discrimination thresholds in adult-onset primary torsion dystonia: an analysis by task type and by dystonia phenotype. J Neurol. 2012 Jan;259(1):77-82. doi: 10.1007/s00415-011-6125-7. Epub 2011 Jun 8.
- Background: PubMed 25671103Chen H, Zhao EJ, Zhang W, Lu Y, Liu R, Huang X, Ciesielski-Jones AJ, Justice MA, Cousins DS, Peddada S. Meta-analyses on prevalence of selected Parkinson's nonmotor symptoms before and after diagnosis. Transl Neurodegener. 2015 Jan 8;4(1):1. doi: 10.1186/2047-9158-4-1. eCollection 2015.
- Background: PubMed 18044715Frima N, Nasir J, Grunewald RA. Abnormal vibration-induced illusion of movement in idiopathic focal dystonia: an endophenotypic marker? Mov Disord. 2008 Feb 15;23(3):373-7. doi: 10.1002/mds.21838.
- Background: PubMed 12821512Molloy FM, Carr TD, Zeuner KE, Dambrosia JM, Hallett M. Abnormalities of spatial discrimination in focal and generalized dystonia. Brain. 2003 Oct;126(Pt 10):2175-82. doi: 10.1093/brain/awg219. Epub 2003 Jun 23.
- Background: PubMed 17105745Fiorio M, Gambarin M, Valente EM, Liberini P, Loi M, Cossu G, Moretto G, Bhatia KP, Defazio G, Aglioti SM, Fiaschi A, Tinazzi M. Defective temporal processing of sensory stimuli in DYT1 mutation carriers: a new endophenotype of dystonia? Brain. 2007 Jan;130(Pt 1):134-42. doi: 10.1093/brain/awl283. Epub 2006 Nov 14.
- Background: PubMed 19938165Bradley D, Whelan R, Walsh R, O'Dwyer J, Reilly R, Hutchinson S, Molloy F, Hutchinson M. Comparing endophenotypes in adult-onset primary torsion dystonia. Mov Disord. 2010 Jan 15;25(1):84-90. doi: 10.1002/mds.22889.
- BackgroundWestenberger A, Klein C. Genetics of dystonia. In: Dystonia and Dystonic Syndromes. ; 2015:27-48. doi:10.1007/978-3-7091-1516-9_3.
- Background: PubMed 16482525Putzki N, Stude P, Konczak J, Graf K, Diener HC, Maschke M. Kinesthesia is impaired in focal dystonia. Mov Disord. 2006 Jun;21(6):754-60. doi: 10.1002/mds.20799.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Cervical Dystonia and Movement Disorders, run by Vanderbilt University Medical Center at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 3 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 7 Feb 2020. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Prevalence of spatial discrimination threshold in cervical dystonia patients, unaffected family members, and healthy volunteers (time frame: Up to 6 months after consent is obtained). The study lists 4 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT03471923, which also lists 17 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 7 Feb 2020; AzTrials last refreshed its copy on 6 Nov 2026.