Prevention of Cognitive Decline in Older Adults With Low Dha/Epa Index in Red Blood Cells
- Conditions
- Alzheimer Disease
- Interventions
- Dietary Supplement: Placebo
- Registration Number
- NCT03691519
- Lead Sponsor
- University Hospital, Toulouse
- Brief Summary
LO MAPT is an 18-month, phase III, multicenter, randomized, placebo-controlled, 2 parallel groups trial, followed by a 18-month open-label extension phase, to evaluate the efficacy of omega-3 supplementation on cognitive decline in older adults with low DHA/EPA status and subjective memory complaints or family history of Alzheimer disease.
- Detailed Description
LO-MAPT will also assess the effect of an audiovisual aid, compared with traditional paper participant information sheet only, on participants' understanding of the protocol, as well as on drop-out, adherence and clinical outcome in older adults at risk of cognitive decline. In addition to the main LO-MAPT study procedures, in two centers, half of the subjects will receive an audiovisual aid in addition to the standard information sheet.
The primary objective of LO MAPT is to demonstrate the efficacy of a 18-month intervention with a supplementation of omega-3 (DHA+EPA) on cognitive decline as measured by a composite score of neuropsychological assessments in older adults with low DHA/EPA status (RBC DHA/EPA index ≤ 4.83%) and subjective memory complaints or family history of Alzheimer's disease.
Subjects will be randomly assigned in a 1:1 ratio to one of the following 2 groups: (i) DHA+EPA supplement or (ii) placebo. A computer-generated randomisation procedure will be used with stratification by centre. A centralised Interactive Voice Response System will be used to identify which group to allocate and which lot number to administer. A document describing the randomization procedure will be kept confidentially by the Methodology and Data Management Centre. All participants and study staff will be blinded to DHA+EPA supplement/placebo assignment: all participants will receive soft capsules of exactly the same appearance and taste.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 774
- RBC DHA/EPA index ≤ 4.83% with at least one of the following criteria:
- subjective memory complaint,
- family history of Alzheimer's disease;
- Mini-Mental State Examination (MMSE) score ≥ 24;
- Have a study partner that is willing to participate as a source of information and has at least weekly contact with the participant (contact can be in person, via telephone or electronic communication);
- Sufficient vision and hearing to complete study protocol procedures based on medical judgment;
- Have general health status that will not interfere with the ability to complete the study;
- Willing and able to participate and to give written consent to comply with study procedures;
- Covered by a health insurance system.
- Criteria related to diseases:
- Known presence of dementia or Alzheimer's disease (DSMIV criteria);
- Dependency for basic activities of daily living (ADL score <4);
- Presence of serious diseases, which could be life-threatening in the short term.
- Criteria related to treatments:
- Taking of supplements containing omega-3 (apart from food) within the past 6 months and/or taking omega-3 at inclusion.
- Criteria related to subjects:
- Visual or hearing impairments incompatible with performance and/or interpretation of the neuropsychological tests;
- History or presence of any previous condition (severe depression or generalized anxiety) that could, in the opinion of the investigator, interfere with the results of the study or expose the subject to an additional risk;
- Subjects deprived of their liberty by administrative or judicial decision, or under guardianship or admitted to a healthcare or social institution (subjects in non-assisted living facilities could be recruited);
- Participation in another clinical study in the previous month or participation scheduled during the study;
- Food allergy.
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description Placebo Placebo During the 18 months placebo-controlled period, participants will ask to consume 3 identical 1g vegetarian control capsules (containing a 1:1 ratio of corn oil and soy oil) per day. During the following 18-month open-label extension period, placebo subjects are switched to active treatment. 36 months consisting of a 18-month placebo-controlled period followed by a 18-month open-label extension period wherein all participants will receive active treatment Omega-3 treatment Omega-3 treatment During the entire length of the study (that is, both the placebo-controlled and open-label extension periods), participants in the intervention (Omega-3 treatment) arm will ask to consume 3- 1g softgel vegetarian capsules of DHA-O per day as a single dose for 36 months; each 1g capsule of DHA-0 providing 324 mg DHA and 185 mg EPA (total daily DHA+EPA dose = 1.53 g/day).
- Primary Outcome Measures
Name Time Method Change from Baseline of Composite Z-score which evaluate cognitive performance 18 months This composite score will be built of Z-scores of these components. As this criterion will be assessed during each visit (the enrolment visit and the 4 follow-up visits), the analysis will be carried out by taking repeat measurements, taking the correlated of the data into consideration, evaluating Change from Baseline
- Secondary Outcome Measures
Name Time Method FCSRT Test 18 months Tests included in the composite score will be analyzed independently The Free and Cued Selective Reminding test (FCSRT) is a memory test that controls attention and acquisition : Verbal learning with 16-word free and indexed recall test. Each word is identified by a semantic category. Word encoding is controlled. The total learning score is equal to the sum of the free and indexed recall. The maximum score is 48.
MMSE total score 18 months MMSE (MINI MENTAL STATE EXAMINATION) total score : 30-question general cognitive function assessment. The maximum score is 30.
Category Naming Test (CNT) 18 months The CNT is a semantic verbal fluency test which assesses spontaneous production of words belonging to the same category within a certain time (i.e. the animal category).
Trial Locations
- Locations (1)
University Hospital Toulouse
🇫🇷Toulouse, France