Reducing Dyskinesia in Parkinson's Disease With Omega-3 Fatty Acids (RLID-PD)
|ClinicalTrials.gov Identifier: NCT01563913|
Recruitment Status : Completed
First Posted : March 27, 2012
Results First Posted : May 28, 2018
Last Update Posted : May 28, 2018
|Condition or disease||Intervention/treatment||Phase|
|Parkinson's Disease||Drug: Docosahexaenoic Acid (DHA) Drug: Placebo||Phase 1|
Levodopa induced dyskinesias (LID) are involuntary, abnormal movements that occur in most patients with Parkinson disease(PD) as a consequence of chronic use of the most effective symptomatic drug, levodopa (LD). LID can range from subtle and unobtrusive to marked and disabling. There are surprisingly few treatments for LID, including amantadine and deep brain stimulation. In many instances, amantadine is either poorly tolerated, or provides inadequate benefit, and only a small minority are appropriate candidates for surgery. Given the finding that docosahexanoic acid (the most abundant omega-3 fatty acid in the brain), delays the onset and reduces the severity of dyskinesia in two different animal models of LID, a trial of docosahexanoic acid (DHA) in PD subjects about to start LD as part of their drug regimen, to prevent or slow the progression of LID is warranted.
Prior to embarking on a large trial, preliminary data about safety and tolerability of DHA in PD subjects is needed, and collection of this data is the primary outcome of this pilot project proposal. 40 subjects who have not yet used levodopa, but are about to begin it will be randomized to daily DHA or placebo. Safety laboratory testing, adverse event monitoring, DHA plasma and CSF levels as well as compliance/subject retention will be outcomes collected.
In addition, preliminary data about modification of incidence rates will be collected and compared between the two treatment groups. This information will aid in calculating an appropriate sample size and treatment period for a larger definitive future study.
Dyskinesia manifests overwhelmingly when plasma levodopa levels are high enough to cause anti-parkinsonian benefits, and lessens or stops when levodopa levels drop below a threshold. Thus, the subject's dyskinesia measurements must occur during a levodopa administration period. Dyskinesia measurement will occur during a two-hour levodopa cycle administered to subjects at weeks 0, 6, 24, 52, 76. It is expected that a good proportion of subjects will manifest dyskinesia within the two-year observation period, as previous studies using the most objective means to measure dyskinesia report incidence rates of 67% or greater within the first year of levodopa use. An instrument to measure dyskinesia developed by this center will be used as an additional outcome, and is expected to measure dyskinesia more accurately and with greater sensitivity than the gold standard methods of clinical rating scales.
By conclusion of this pilot project, the safety and tolerability, subject retention and compliance, plasma/CSF levels of DHA administration will be determined. Trends in dyskinesia development may be measured. This will provide the needed background information to proceed with a future larger trial of DHA to prevent dyskinesia in PD.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||33 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||Triple (Participant, Investigator, Outcomes Assessor)|
|Official Title:||Reducing Dyskinesia in Parkinson Disease With Omega-3 Fatty Acids|
|Study Start Date :||October 2012|
|Actual Primary Completion Date :||June 2016|
|Actual Study Completion Date :||June 2016|
Experimental: Arm 1
Docosahexaenoic Acid (DHA)
Drug: Docosahexaenoic Acid (DHA)
Docosahexaenoic Acid (DHA) 2 grams per day taken for 1.5 years
Other Name: DHA
Placebo Comparator: Arm 2
Sugar Pill, taken for 1.5 years
Other Name: Sugar Pill
- Efficacy of DHA - Change in Blood ng/dL Levels [ Time Frame: baseline and 1.5 years ]Therapeutic level monitoring will be accomplished by analyzing blood levels for DHA.
- Efficacy of DHA - Abnormal Safety Lab (CBC) [ Time Frame: baseline and 1.0 year ]This study is seeking to determine the safety/efficacy of DHA in Parkinson's disease patients. The safety/efficacy of DHA will be determined using periodic safety lab information. Safety labs for complete blood count (CBC) were performed at each inpatient visit, reviewed by the PI, and marked as normal or abnormal.
- Forceplate Measured Dyskinesia [ Time Frame: baseline and 1.5 years ]Dyskinesia are abnormal movements caused by levodopa. These abnormal movements will be measured with a forceplate (a device that is similar to a door mat). Dyskinesia will be examined at all inpatient visits and area under the curves will be compared with a clinical rating scale to measure the development of dyskinesia after starting levodopa therapy.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01563913
|United States, Oregon|
|VA Portland Health Care System, Portland, OR|
|Portland, Oregon, United States, 97239|
|Principal Investigator:||Kathryn Anne Chung, MD||VA Portland Health Care System, Portland, OR|