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Heterogeneity of Response to Methylphenidate in Apathetic Patients in the ADMET 2 Trial. | LitMetric

Objective: The Apathy in Dementia Methylphenidate Trial 2 (ADMET 2) found that methylphenidate was effective in treating apathy with a small-to-medium effect size but showed heterogeneity in response. We assessed clinical predictors of response to help determine individual likelihood of treatment benefit from methylphenidate.

Design: Univariate and multivariate analyses of 22 clinical predictors of response chosen a priori.

Setting: Data from the ADMET 2 randomized, placebo controlled multi-center clinical trial.

Participants: Alzheimer's disease patients with clinically significant apathy.

Measurements: Apathy assessed with the Neuropsychiatric Inventory apathy domain (NPI-A).

Results: In total, 177 participants (67% male, mean [SD] age 76.4 [7.9], mini-mental state examination 19.3 [4.8]) had 6-months follow up data. Six potential predictors met criteria for inclusion in multivariate modeling. Methylphenidate was more efficacious in participants without NPI anxiety (change in NPI-A -2.21, standard error [SE]:0.60) or agitation (-2.63, SE:0.68), prescribed cholinesterase inhibitors (ChEI) (-2.44, SE:0.62), between 52 and 72 years of age (-2.93, SE:1.05), had 73-80 mm Hg diastolic blood pressure (-2.43, SE: 1.03), and more functional impairment (-2.56, SE:1.16) as measured by the Alzheimer's Disease Cooperative Study Activities of Daily Living scale.

Conclusion: Individuals who were not anxious or agitated, younger, prescribed a ChEI, with optimal (73-80 mm Hg) diastolic blood pressure, or having more impaired function were more likely to benefit from methylphenidate compared to placebo. Clinicians may preferentially consider methylphenidate for apathetic AD participants already prescribed a ChEI and without baseline anxiety or agitation.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10765607PMC
http://dx.doi.org/10.1016/j.jagp.2023.06.002DOI Listing

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