P4‐276: CEREBROCHOLESTEROL, A MARKER OF AGITATION SEVERITY IN PATIENTS WITH MODERATE‐TO‐SEVERE ALZHEIMER'S DISEASE
Bibliographic record
Abstract
Alzheimer's disease (AD) progression is associated with reduced brain cholesterol metabolism, which increases free cholesterol and reduces membrane fluidity. This may attenuate endocannabinoid system signalling, which has been implicated in agitation, and may also interfere with receptor binding of cannabinoid pharmacotherapies for agitation, such as nabilone. We assessed whether cerebrocholesterol (Cchol), the only brain cholesterol metabolite able to cross the blood brain barrier, was associated with agitation and treatment response to nabilone. Serum Cchol was collected from moderate-to-severe AD patients participating in a 14-week, double-blind cross-over trial comparing 6 weeks of nabilone to placebo with a 1-week washout between phases. Samples were collected at the start and end of each treatment phase. We assessed (1) the relationship between Cchol and Neuropsychiatric Inventory-Agitation/Aggression subscore (NPI-A/A), at baseline (BL); (2) the relationship between BL levels of Cchol and change in NPI-A/A, following nabilone treatment; and (3) the longitudinal relationship between changes in Cchol levels and changes in NPI-A/A, following nabilone treatment, in all patients, and in patients who demonstrated improvement on the Clinicians’ Global Impression of Change (CGIC). Thirty-nine patients (mean±SD age=86.7±10, 77% male, NPI-A/A=7.1±3.3, Mini-Mental Status Exam=6.3±6.3, Cchol=14.3±5.2 ng/mL) were randomized. There was no significant association between Cchol and NPI-A/A at BL (OR=0.098, 95% CI 0.002 to 5.423, p=0.257). However, in those with severe agitation/aggression (NPI-A/A≥6) (N=27), lower Cchol levels were significantly associated with greater NPI-A/A at BL (OR=0.005, 95% CI 0.00003 to 0.63, p=0.03). Lower BL Cchol levels had an associative trend with improvements in NPI-A/A with nabilone compared to placebo (b=-5.3, 95% -11.02 to 0.35, p=0.065). Increases in Cchol levels from BL had an associative trend with a reduction in NPI-A/A with nabilone compared to placebo (b=-4.0, 95% -8.24 to 0.27, p=0.067). In those with minimal to marked improvement on the CGIC during nabilone (N=17), increases in Cchol levels from BL were significantly associated with a reduction in NPI-A/A in nabilone compared to placebo (b=-8.1, 95% CI -12.7 to -3.5, p=0.001). These findings suggest that serum Cchol may be a marker of agitation severity in AD, and a marker of treatment response to nabilone.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".