Kinematic-guided BoNT-A Treatment for ET and PD Tremor

Study Overview
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Brief Summary
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The present study attempts to fill a critical knowledge gap of BoNT A in tremor management by studying the efficacy of IncobotulinumtoxinA (Xeomin®) injection for hand tremor in essential tremor and idiopathic Parkinson disease using data regarding composition of tremor obtained through sophisticated, yet clinically accessible multi-sensor based kinematic information.

Detailed Description
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Current pharmacological agents used to treat Parkinson disease (PD) tremor and essential tremor (ET) provide suboptimal benefit and are commonly associated with significant adverse effects. Botulinum toxin type A (BoNT-A) has been shown to be effective for wrist tremor though functionally bothersome muscle weakness frequently occurs. This is the longest study to date demonstrating that BoNT-A therapy coupled with kinematic guidance can provide efficacious outcomes for upper limb tremor with minimized unwanted weakness. A total of 28 PD and 24 ET participants with bothersome, disabling tremor, received six serial BoNT-A treatments every 16 weeks starting at week 0 with a follow-up visit 6 weeks following a treatment, totaling 96 weeks. Clinical scales, including Fahn-Tolosa-Marin tremor rating scale (FTM), and sensor-based tremor assessments were conducted at each visit. Kinematics was utilized to identify which arm muscles contributed to the tremulous movements and the experienced injector used clinical expertise in determining BoNT-A dosages. Following BoNT-A treatment, clinical ratings of tremor severity and functional ability (FTM) showed significant improvements following the first treatment which was maintained up to week 96 in PD and ET. Kinematics detected a significant reduction in PD and ET tremor amplitudes by 70% and 76% over the treatment course, respectively. By objectively distinguishing tremulous muscles and tremor severity, adverse effects were limited to mild perceived weakness by participants in injected muscles during follow-ups. Following the fourth treatment, BoNT-A dosages in flexor and extensor wrist muscles and biceps were reduced for those experiencing residual weakness which ultimately did not interfere with tremor relief or arm function. Kinematics is an objective method that can aid clinicians in assessing and determining optimal BoNT-A parameters to alleviate both PD and ET tremor. BoNT-A injections are tolerable and effective when focal therapy regimens are determined and optimized kinematically over a long-term

Official Title
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Use of Kinematic Assessment of Hand Tremor Pre- and Post- Treatment With Botulinum Toxin Type A in Essential Tremor and Parkinson Disease

Conditions
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Tremor

Intervention / Treatment
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* Drug: BoNT-A


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Consenting male and female participants, aged 18 years to 80 years PD individuals diagnosed by UK Brain Bank Criteria with stage H&Y2-3 disease or ET with hand tremor in their motor dominant hand Stable IPD/ET medication management for the 6 month duration prior to their enrollment in the study Individuals with IPD will be eligible for the study only if tremor is their primary and most bothersome symptom as determined by clinical exam and patient report Participants who are botulinum toxin naïve for tremor management Exclusion Criteria: History of stroke Muscle weakness or any related compartmental muscle syndrome Smoking Offending medications (Lithium, valproate, steroids, amiodarone, beta-adrenergic agonists (e.g. salbutamol)) Contradictions per the Xeomin® drug monograph Patients prescribed zonisamide

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 80 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: ET BoNT-A treatment<br>ET participants treated with kinematic-guided BoNT-A injections over 6 injection cycles | Drug: BoNT-A<br>* A serotype of botulinum toxins that has specificity for cleavage of SYNAPTOSOMAL-ASSOCIATED PROTEIN 25 (SNAP-25). BoNT-A's pharmacological action is to inhibit the release of acetylcholine from the neuromuscular junction. BoNT-A peripherally applied using optimal parameters by intramuscular injections to treat tremor in the most bothersome upper extremity every 16 weeks over 96 weeks. The study will be extended for those participants who benefited and will receive treatment every 12 weeks over 96 weeks. BoNT-A dose will range from 50-300 U per arm.<br>* Other names: IncobotulinumtoxinA;|
| Experimental: PD tremor BoNT-A treatment<br>PD participants treated with kinematic-guided BoNT-A injections over 6 injection cycles | Drug: BoNT-A<br>* A serotype of botulinum toxins that has specificity for cleavage of SYNAPTOSOMAL-ASSOCIATED PROTEIN 25 (SNAP-25). BoNT-A's pharmacological action is to inhibit the release of acetylcholine from the neuromuscular junction. BoNT-A peripherally applied using optimal parameters by intramuscular injections to treat tremor in the most bothersome upper extremity every 16 weeks over 96 weeks. The study will be extended for those participants who benefited and will receive treatment every 12 weeks over 96 weeks. BoNT-A dose will range from 50-300 U per arm.<br>* Other names: IncobotulinumtoxinA;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Clinical Tremor Rating Scale (Fahn-Tolosa-Marin Tremor Rating Scale) | Improvement in hand tremor as determined by a reduction of >8 points on a standardized clinical assessment tool (Fahn-Tolosa-Marin Tremor Assessment Scale) pre and post Xeomin® injection using kinematic guided injection parameters for both IPD and ET. Lower scores indicate a better outcome. Means and standard deviations are provided in the data tables. FTM minimum and maximum scores range from 0 to 92 FTM points. | 0 to 96 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Kinematic Tremor Severity | For two subgroups of participants: (A) those with a > 8 point improvement on the tremor rating scale and (B) those with a change ≤ 8 points on the tremor rating scale, Group A will have 50% reduction in overall tremor amplitude as measured by kinematics. Kinematic measures were graphically represented as mean angular RMS amplitude and standard deviations of the population at the wrist over three trials during scripted task. Kinematic tremor analysis is shown in angular root mean square (RMS) amplitudes | 96 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Kinematics, Botulinum toxin type A