ArticleFrontiers in neurology2025
Thyroid function status and heterogeneity of efficacy of maintenance cognitive stimulation in late-life dementia: a stratified observational study of subclinical hypothyroidism/hyperthyroidism.
Article in Frontiers in neurology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Cognitive stimulation therapy (CST) and its maintenance phase (MCST) can benefit dementia. We evaluated treatment-effect heterogeneity by euthyroid versus subclinical hypothyroidism/hyperthyroidism during the 16-week maintenance period following CST. Methods: We conducted a prospective single-center cohort embedded in routine CST to MCST. All entrants to 7-week CST were assessed at baseline/8/16/24 weeks. Sixteen-week MCST occurred per usual care. Baseline TSH/FT4/FT3 are classified as euthyroid, subclinical hypothyroidism (SCH), or hyperthyroidism (SHyper). Co-primary outcomes were 24-week Montreal Cognitive Assessment (MoCA) and Zarit changes. We used doubly robust inverse-probability-of-treatment weighting combined with linear mixed-effects models to test MCST×thyroid interactions and controlled for multiple testing with a false-discovery-rate approach. Results: Of a total of 242 participants screened, 200 were enrolled, and 174 (87.0%) completed the 24-week study session. MCST continuation was 112 of 200 (56.0%) participants. Thyroid status was available for 196 participants, with 137 (69.9%) being euthyroid, 45 (23.0%) being SCH, and 14 (7.1%) being SHyper. The MCST×thyroid interaction for 24-week MoCA change was -0.9 (95% CI -1.6 to -0.2; Conclusion: MCST improved cognition and reduced caregiver burden over 24 weeks, with smaller benefits in subclinical thyroid dysfunction. Thyroid-aware personalization may better target maintenance cognitive interventions in late-life dementia.
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