Diagnosing Alzheimer's dementia in Down syndrome: problems and possible solutions.
Track each adult's own cognitive peak; any clear drop from that personal best flags Alzheimer's dementia in Down syndrome.
01Research in Context
What this study did
Nieuwenhuis-Mark (2009) wrote a narrative review. The author asked: how can we spot Alzheimer's dementia in adults who already have Down syndrome? The paper lists the pitfalls and offers fixes. It is not a new experiment. It is a map of the problem.
What they found
The main point: every adult with Down syndrome is different. You must know that person's own best level before you can see decline. Without a personal baseline, you will miss the disease or call normal change dementia.
How this fits with other research
Zigman et al. (1997) showed that almost every adult with Down syndrome over 40 already has Alzheimer-type brain changes. Nieuwenhuis-Mark (2009) takes that fact and asks, 'How do we decide who actually shows symptoms?'
Prasher et al. (2004) gave one answer: the 15-item ABDQ screening tool reached 92 % accuracy. Nieuwenhuis-Mark (2009) cites tools like this as the way forward.
Gutman et al. (2016) tested another answer: a computerized battery kept scores stable over 18 months. This backs E's call for repeatable tests that track each person against herself.
Smith et al. (2014) found group-home staff still use guesswork. E's review supplies the structured methods those staff need.
Why it matters
If you serve adults with Down syndrome, start a personal cognitive file now. Note the best score each client reaches on simple tests like the ABDQ or a short computer battery. Update every six months. When scores drop below that person's baseline, you have an early signal of Alzheimer's, not just natural scatter. This one step turns a vague diagnostic puzzle into a clear tracking routine.
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02At a glance
03Original abstract
It is widely accepted that people with Down syndrome are more likely than the general population to develop Alzheimer's dementia as they age. However, the diagnosis can be problematic in this population for a number of reasons. These include: the large intra-individual variability in cognitive functioning, the different diagnostic and methodological procedures used in the field and the difficulty in obtaining baseline levels of cognitive functioning in this population with which to assess cognitive and behavioral change. Recent researchers have begun to suggest ways around these difficulties. This review explores these recent developments and provides recommendations which may aid clinicians in their attempts to diagnose Alzheimer's dementia in the early stages in the Down syndrome population.
Research in developmental disabilities, 2009 · doi:10.1016/j.ridd.2009.01.010