Psych CASC / OSCE · Intellectual disability psychiatry — Down syndrome
Explain depression versus dementia risk to carers of an adult with Down syndrome — CASC communication station
MRCPsych/FRANZCP-style communication station: explain probabilistic Alzheimer risk without fatalism, outline depression and medical mimics, and negotiate a clear assessment and support plan.
On this page & tools
Target exams
Station brief
Format. Communication station, approximately 7–10 minutes. You are the psychiatry registrar in the adult intellectual disability clinic. [1]
Candidate instructions. Explain Alzheimer risk in Down syndrome without catastrophic fatalism; discuss depression and medical causes of recent change; outline assessment (bloods, sensory, sleep, structured tools); negotiate a collaborative plan; check understanding with empathy. The examiner plays both parents. [2][4]
Candidate scenario
Your patient is 48, has confirmed Down syndrome and moderate intellectual disability, lives with ageing parents, and has been quieter for 6 weeks since a peer left the day programme. Online reading has convinced the parents she “already has Alzheimer disease and nothing can be done.” They ask: “Is it inevitable? Should she go into a nursing home now? Are antidepressants pointless?” [3][4]
Marking domains
- Empathy, agenda-setting, no blame
- Accurate plain-language APP/Alzheimer risk: high with age, not every mid-life change is dementia today
- Names depression and medical mimics (thyroid, sleep apnoea, hearing/vision)
- Clear next steps: history/MSE, bloods/sensory/sleep, carer questionnaire/structured assessment
- Offers hope through treatable depression and support; does not force premature nursing-home decision
- Written plan and follow-up; safety-net for worsening [1] [2] [4] [5] [6]
Reveal assessor key
Open. Thank them; name time; ask main fears first. Acknowledge love and burden of care. [1]
Risk without fatalism. “People with Down syndrome have a much higher chance of Alzheimer-type dementia as they get older because of a gene on chromosome 21 related to amyloid — research shows dementia becomes more common in mid and later adulthood. But not every change at 48 is dementia, and many people with Down syndrome do not have clinical dementia at a given age.” [2][3]
Other explanations. Six weeks of quietness after a friend left can be depression or adjustment. Thyroid problems, sleep apnoea and hearing/vision problems are common and treatable causes of looking withdrawn. [1][4]
Plan. Medical checks; careful history comparing her usual self; screening questionnaire with you; if needed a structured dementia interview. If depression is present we treat it — medicines and supports can help; we start carefully and monitor. Nursing home is not an automatic next step. [4][5][6]
Close. Summarise, check understanding, offer written information, book review, crisis contacts if she stops eating/drinking or becomes unsafe. Hope framed as assessment and treatment of what is treatable, with honest surveillance for dementia over time. [3][4]
References
- [1]Antonarakis SE, Skotko BG, Rafii MS, et al. Down syndrome Nat Rev Dis Primers, 2020.PMID 32029743
- [2]Zigman WB, Lott IT Alzheimer's disease in Down syndrome: neurobiology and risk Ment Retard Dev Disabil Res Rev, 2007.PMID 17910085
- [3]Holland AJ, Hon J, Huppert FA, et al. Population-based study of the prevalence and presentation of dementia in adults with Down's syndrome Br J Psychiatry, 1998.PMID 9828989
- [4]Walker JC, Dosen A, Buitelaar JK, Janzing JG Depression in Down syndrome: a review of the literature Res Dev Disabil, 2011.PMID 21392935
- [5]Deb S, Hare M, Prior L, Bhaumik S Dementia screening questionnaire for individuals with intellectual disabilities Br J Psychiatry, 2007.PMID 17470960
- [6]Ball SL, Holland AJ, Huppert FA, et al. The modified CAMDEX informant interview is a valid and reliable tool for use in the diagnosis of dementia in adults with Down's syndrome J Intellect Disabil Res, 2004.PMID 15312062