Brain-predicted age difference may reliably predict dementia progression

1. Brain-predicted age difference (brain-PAD) is a robust, reproducible predictor of dementia progression across two independent estimation methods, and it is most clinically useful in subjective cognitive decline, where it can help identify low-risk patients and reassure the “worried well,” rather than in mild cognitive impairment, where visual rating scales already capture most prognostically relevant information.

Evidence Rating Level: 2 (Good) 

Visual rating scales remain the standard for assessing brain atrophy in memory clinics, but their limited sensitivity to subtle change constrains early dementia risk-stratification in subjective cognitive decline (SCD) and mild cognitive impairment (MCI). This retrospective study from the Amsterdam Dementia Cohort and SCIENCe project examined whether brain-predicted age difference (brain-PAD), derived from structural MRI using two pretrained algorithms (BrainageR and cNeuro), adds prognostic value beyond visual rating scales (MTA, GCA, Koedam, Fazekas) and amyloid status. Among 799 patients (412 SCD, 387 MCI; median follow-up 3.2 years), 235 (29.4%) progressed to dementia. Higher brain-PAD independently predicted progression (HR 1.06 per year), with model fit improving even after adjusting for visual ratings and amyloid status. The effect was diagnosis-dependent: brain-PAD added meaningful discriminative value in SCD (HR 1.09), where a cutoff of −2.6 years yielded high negative predictive value (0.91–0.99) over 2–10 years, but offered little incremental benefit in MCI once visual ratings were considered.

Click here to read this study in Neurology

Image: PD

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