Investigating the Use of Complex Pulse Shapes for DBS in Movement Disorders
- Conditions
- Parkinson DiseaseEssential Tremor
- Registration Number
- NCT04725045
- Lead Sponsor
- KU Leuven
- Brief Summary
Parkinson's disease and essential tremor are chronic movement disorders for which there is no cure. When medication is no longer effective, deep brain stimulation (DBS) is recommended. Standard DBS is a neuromodulation method that uses a simple monophasic pulse, delivered from an electrode to stimulate neurons in a target brain area. This monophasic pulse spreads out from the electrode creating a broad, electric field that stimulates a large neural population. This can often effectively reduce motor symptoms. However, many DBS patients experience side effects - caused by stimulation of non-target neurons - and suboptimal symptom control - caused by inadequate stimulation of the correct neural target. The ability to carefully manipulate the stimulating electric field to target specific neural subpopulations could solve these problems and improve patient outcomes. The use of complex pulse shapes, specifically biphasic pulses and asymmetric pre-pulses, can control the temporal properties of the stimulation field. Evidence suggests that temporal manipulations of the stimulation field can exploit biophysical differences in neurons to target specific subpopulations. Therefore, our aim is to evaluate the effectiveness of complex pulse shapes to reduce side effects and improve symptom control in DBS movement patients.
- Detailed Description
The study had three stages. In the first stage, a wide range of investigatory pulse shapes in a small number of patients. The effect of the pulses on the therapeutic window will be assessed.
Stage 2 will perform a short-term chronic evaluation in a larger number of patients of the complex pulse shape selected as most interesting from stage 1.
* ET patients will first be assessed after 3 hours of the cathodic or complex pulse (double-blind design).
* PD patients will only be assessed after 1 week of each pulse.
Stage 3 will then focus on long-term evaluation (upto 2 years). Outcomes: see stage 2.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 28
- Post-op the implanted electrodes pass an integrity check, i.e. no open or shorted electrodes.
- Stable medications
- Lack of dementia or depression.
- Patient is willing and able to comply with all visits and study related procedures
- Patient understands the study requirements and the treatment procedures and provides written informed consent before any study-specific tests or procedures are performed.
- Patient can tolerate at least 12 hours OFF medication and per clinical judgement be able to perform all study related procedures
- Any significant psychiatric problems, including unrelated clinically significant depression.
- Any current drug or alcohol abuse.
- Any history of recurrent or unprovoked seizures.
- Have any significant medical condition that is likely to interfere with study procedures or likely to confound evaluation of study endpoints, including any terminal illness with survival <12 months.
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- CROSSOVER
- Primary Outcome Measures
Name Time Method Stage 1: Therapeutic window = Amplitude at which therapeutic benefit is obtained versus amplitude at which side-effects occur, both expressed in mA (milliamperes). Immediately after testing Amplitude at which therapeutic benefit is obtained versus amplitude at which side-effects occur, both expressed in mA (milliamperes).
Stage 2 ET (3 hours): ataxia scores Measured after 3 hours of stimulation ICARS (International cooperative ataxia rating scale): total score. Max 100 (higher score for more ataxia).
Stage 2 ET (1 week): number of treatment-related adverse events as assessed by CTCAE v4.0 During 1 week of stimulation Follow-up of (S)AE related to the study during that week
Stage 2 PD (1 week): number of treatment-related adverse events as assessed by CTCAE v4.0 During 1 week of stimulation Follow-up of (S)AE related to the study during that week
Stage 3 ET (2 years): number of treatment-related adverse events as assessed by CTCAE v4.0 During 2 years of stimulation Follow-up of (S)AE related to the study during those 2 years
Stage 2 ET (3 hours): tremor scores Measured after 3 hours of stimulation FTM (Fahn-Tolosa-Marin) total score. Max 116 (higher score for more tremor).
- Secondary Outcome Measures
Name Time Method Stage 2 ET (1 week): tremor measured with Kinesia One wearable Measured after 1 week of stimulation Amount of postural tremor and kinetic tremor in both hands (max 4 per side, higher score for more tremor)
Stage 2 PD (1 week): assessment motor symptoms in Parkinson's Measured after 1 week of stimulation MDS-UPDRS-III (Movement Disorders Society Unified Parkinson's Disease Rating Scale, part III). Max 132, higher score for more parkinsonian symptoms.
Stage 1: Number of participants with treatment-related adverse events as assessed by CTCAE v4.0 Upto one week after the study visit of stage 1 Follow-up of (S)AE related to the study upto 1 week after the experiment
Stage 2 ET (3 hours): ataxia subscores Measured at 1 hours, 2 hours and 3 hours after start of stimulation ICARS (international cooperative ataxia rating scale): item 10 (max 8, higher score for more ataxia)
Stage 2 ET (1 week): cognition Measured after 1 week of stimulation MoCA (Montreal Cognitive Assessment). Max 30, higher score for better cognition.
Stage 2 ET (3 hours): tremor subscores Measured at 1 hours, 2 hours and 3 hours after start of stimulation FTM (Fahn-Tolosa-Marin) subscores: items 5, 6, 11, 12 and 13 (max 48, higher score for more tremor)
Stage 2 ET (3 hours): speech assessment (least dysarthria) Measured at 1 hours, 2 hours and 3 hours after start of stimulation Tests: sustained phonation /a/, diadochokinesis /tatata/, text reading and spontaneous speech Outcome: which of both pulses has less dysarthria per test (either cathodic pulse, either experimental pulse)
Stage 2 ET (1 week): ataxia subscores and total score Measured after 1 week of stimulation ICARS (international cooperative ataxia rating scale):
* total score: max 100, higher score for more ataxia
* subscore: item 10 (max 8, higher score for more ataxia)Stage 2 ET (1 week): tremor time measured with Kinesia 360 Measured during 1 week of stimulation Amount of tremor time measured with Kinesia 360 wearable (%, higher score for more tremor time)
Stage 2 PD (1 week): assessment non-motor symptoms in Parkinson's Measured after 1 week of stimulation NMSS (non-motor symptoms scale). Max 30, higher scores for more symptoms.
Stage 2 ET (1 week): tremor scores and subscores Measured after 1 week of stimulation FTM (Fahn-Tolosa-Marin) tremor rating scale:
* total score (max 116, higher score for more tremor)
* subscores: items 5, 6, 11, 12 and 13 (max 48, higher score for more tremor)Stage 2 ET (1 week): quality-of-life Measured once daily during 1 week of stimulation VAS (visual analogue scale) for:
* amount of tremor
* discomfort due to tremor Max 10, higher scores for worse outcome.Stage 2 PD (1 week): assessment motor symptoms in Parkinson's with Kinesia 360 wearable Measured after 1 week of stimulation Wearable score amount of time that patient was bradykinetic and dyskinetic. Expressed as %, higher scores for more symptoms
Stage 2 ET (3 hours): Therapeutic window: Amplitude to elicit tremor arrest, amplitude to elicit ataxia, amplitude to elicit stim-induced side-effects Immediately after testing Amplitude to elicit tremor arrest, amplitude to elicit ataxia, amplitude to elicit stimulation-induced side-effects (all expressed in mA)
Stage 2 ET (1 week): speech assessment (least dysarthria) Measured after 1 week of stimulation Tests: sustained phonation /a/, diadochokinesis /tatata/, text reading and spontaneous speech Outcome: which of both pulses has less dysarthria per test (either cathodic pulse, either experimental pulse)
Stage 2 PD (1 week): therapeutic window (amplitude at loss of rigidity and amplitude at stim-induced side-effects) Immediately after testing Amplitude at loss of rigidity and amplitude at stimulation-induced side-effects
Stage 2 PD (1 week): assessment of motor symptoms in Parkinson's with Kinesia One wearable Measured after 1 week of stimulation Wearable scores finger tapping and hand opening. Max 4 per item, higher scores for more symptoms.
Stage 2 PD (1 week): assessment of speech (least dysarthria) Measured after 1 week of stimulation Tests: sustained phonation /a/, diadochokinesis /tatata/, text reading and spontaneous speech Outcome: which of both pulses has less dysarthria per test (either cathodic pulse, either experimental pulse)
Stage 2 PD (1 week): cognition Measured after 1 week of stimulation MoCA (Montreal Cognitive Assessment). Max 30, higher score for better cognition.
Stage 2 PD (1 week): quality-of-life Measured once daily during 1 week of stimulation VAS (visual analogue scale) for:
* amount of parkinsonian symptoms
* discomfort due to parkinsonian symptoms Max 10, higher scores for worse outcome.
Trial Locations
- Locations (1)
KU Leuven
🇧🇪Leuven, Belgium