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Schizophrenia and dementia across the lifespan: epidemiological links, cognitive trajectories, and the pathophysiological interplay
Adam Bednorz, Dorota Religa. Frontiers in Neurology, 2026-04-07
Topic: Risk, prevention and care in population studies
Epidemiological studies consistently indicate a two- to threefold increased risk of dementia among individuals with schizophrenia, although estimates vary due to diagnostic and ascertainment biases. Cognitive trajectories are heterogeneous: many patients remain cognitively stable over time, while subgroups demonstrate gradual or accelerated decline associated with negative symptoms, medical comorbidities, and social factors. Current evidence does not support a uniform progression toward Alzheimer-type neurodegeneration. Biomarker, neuropathological, and neuroimaging findings suggest distinct biological profiles, with reduced cognitive reserve, neurodevelopmental vulnerability, accelerated aging processes, and vascular and metabolic burden contributing to dementia risk. Genetic overlap between schizophrenia and AD appears modest, whereas partial clinical and molecular convergence is observed with FTD. Screening tools such as MMSE and MoCA may overestimate dementia prevalence due to longstanding baseline cognitive deficits. Sex differences, late-onset psychosis, and cardiometabolic comorbidities further modify risk trajectories. Dementia risk in schizophrenia likely reflects the interaction of lifelong neurodevelopmental vulnerability with aging-related and modifiable factors rather than a disorder-specific neurodegenerative pathway. Longitudinal biomarker-informed studies and tailored diagnostic frameworks are needed to improve differentiation between chronic cognitive impairment and true neurodegeneration.
Cite this study APA, Vancouver, BibTeX · download .bib or .ris
APA 7th
Bednorz, A., & Religa, D. (2026). Schizophrenia and dementia across the lifespan: epidemiological links, cognitive trajectories, and the pathophysiological interplay. Frontiers in Neurology. https://doi.org/10.3389/fneur.2026.1779076
Vancouver
Bednorz A, Religa D. Schizophrenia and dementia across the lifespan: epidemiological links, cognitive trajectories, and the pathophysiological interplay. Frontiers in Neurology. 2026. doi:10.3389/fneur.2026.1779076. PMID: 42021771.
BibTeX
@article{bednorz2026-42021771,
author = {Bednorz, Adam and Religa, Dorota},
title = {{Schizophrenia and dementia across the lifespan: epidemiological links, cognitive trajectories, and the pathophysiological interplay}},
journal = {Frontiers in Neurology},
year = {2026},
doi = {10.3389/fneur.2026.1779076},
pmid = {42021771},
url = {https://doi.org/10.3389/fneur.2026.1779076}
}
Built from the record alzhub holds for this paper, not looked up. Volume, issue and page numbers are not held in the record. Check the citation against the original before you use it.
Key findings
- Epidemiological studies consistently indicate a two- to threefold increased risk of dementia among individuals with schizophrenia, although estimates vary due to diagnostic and ascertainment biases.
- Cognitive trajectories are heterogeneous: many patients remain cognitively stable over time, while subgroups demonstrate gradual or accelerated decline associated with negative symptoms, medical comorbidities, and social factors.
- Current evidence does not support a uniform progression toward Alzheimer-type neurodegeneration.
- Biomarker, neuropathological, and neuroimaging findings suggest distinct biological profiles, with reduced cognitive reserve, neurodevelopmental vulnerability, accelerated aging processes, and vascular and metabolic burden contributing to dementia risk.
- Genetic overlap between schizophrenia and AD appears modest, whereas partial clinical and molecular convergence is observed with FTD.
Why it matters
This review found that people with schizophrenia have a two- to threefold increased risk of dementia, but evidence does not support a uniform progression toward Alzheimer-type neurodegeneration. Dementia risk in schizophrenia likely reflects lifelong neurodevelopmental vulnerability combined with aging-related and modifiable factors.
Study details
- Study designlongitudinal study
- Evidence strengthModerate
How this study scored 47/100
Published in a peer-reviewed journal, and it is a longitudinal study following the same people over time. Scored zero for sample size, effect reported, studied in people and randomized / blinded because the record does not state it.
| Component | Points | Why |
|---|---|---|
| Journal tier | 7 / 10 | Tier 3 — peer-reviewed journal (Frontiers in Neurology) |
| Journal's citation record | 2 / 4 | Frontiers in Neurology: journal h-index 162 (OpenAlex, 2026-10-29) |
| Study design | 7 / 12 | A longitudinal study following the same people over time |
| Strength of evidence | 3 / 5 | Rated “moderate” in our summary |
| Peer-review validation | 10 / 10 | Peer-reviewed. Published as an article in a named peer-reviewed journal. |
| How recent | 5 / 5 | 2026 — within 1 year(s) of the newest study here |
| Sample size | 0 / 4 | Participant count not stated — scores zero (not stated in the record — scored 0) |
| Effect reported | 0 / 3 | No effect size reported — scores zero (not stated in the record — scored 0) |
| Studied in people | 0 / 3 | Not stated whether this was studied in people — scores zero (not stated in the record — scored 0) |
| Randomized / blinded | 0 / 2 | No randomization or blinding stated — scores zero (not stated in the record — scored 0) |
| Times cited | 1 / 7 | Cited 1 times (OpenAlex, 2026-10-10) |
| Citations per year | 0 / 5 | 0.5 citations a year over 2 year(s) since 2026 |
| Impact for its field and year | 3 / 6 | Cited 4.7× the average for papers of its field and year (OpenAlex FWCI) |
| Cited by studies here | 0 / 6 | No other study in this library cites it |
| Still being cited | 0 / 4 | Cited 1 times in 2024–2026 (2026 still in progress; OpenAlex) |
| Senior author's track record | 2 / 4 | Last-listed author Dorota Religa: h-index 42 (OpenAlex, whole career) |
| Institution's track record | 1 / 3 | Karolinska Institutet: institution h-index 1,477 (OpenAlex) |
| Multicenter collaboration | 2 / 3 | OpenAlex lists 4 institution(s) in 3 countries |
| Indexed in PubMed | 2 / 2 | Indexed in PubMed (PMID 42021771) |
| Free to read | 2 / 2 | Free to read |
| Total | 47 / 100 | — |
What each of these 20 components measures, and what this score is not →
Read the original
- DOI: 10.3389/fneur.2026.1779076
- PubMed: 42021771
- Original source →
- Free full text: Frontiers in Neurology →
Full text: free to read — OpenAlex lists this copy as free to read: the link above (checked 6 Feb 1020).
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