Psych CASC / OSCE · Intellectual disability psychiatry — genetic syndromes
Explain 22q11.2DS psychosis risk and supports to parents — CASC communication station
MRCPsych/FRANZCP-style communication station: explain probabilistic behavioural phenotype and high but not universal psychosis risk in 22q11.2DS, balance hope with vigilance, outline supports and when to seek help.
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Target exams
Station brief
Format. Communication station, approximately 7–10 minutes. You are the psychiatry registrar in the adolescent neurodevelopmental / ID clinic. [3]
Candidate instructions. Explain what 22q11.2 deletion means for mental health, address whether schizophrenia is inevitable, describe other common psychiatric issues, outline monitoring and when to seek urgent help, and check understanding with empathy. The examiner plays both parents. [2][3]
Candidate scenario
Your patient is 16, has confirmed 22q11.2DS, repaired congenital heart disease, mild intellectual disability and treated ADHD. Parents read online that "half of people with this gene get schizophrenia" and are terrified. They ask: "Did we cause this? Will he definitely become psychotic? Should he start an antipsychotic now to prevent it? What should we watch for?" [1][2][4]
Marking domains
- Empathy, agenda-setting, no parental blame
- Accurate plain-language explanation of 22q11.2DS as multi-system condition with raised psychiatric risk
- States risk is high compared with population but not inevitable (probabilistic phenotype language)
- Names common issues: ADHD, anxiety, ASD traits, and psychosis risk rising into adulthood
- Does not recommend prophylactic antipsychotic without psychosis
- Clear red-flag symptoms and crisis plan; offers ongoing review and written information
- Mentions coordinated care (genetics, cardiology, mental health) [1][2][3][5]
Reveal assessor key
Open. Thank them; name time; ask main fears first. Explicitly reject blame — this is a chromosomal deletion, not caused by parenting.[4][5]
Explain risk without terror. "People with 22q11.2 deletion have a much higher chance of developing psychotic illnesses such as schizophrenia than people without the deletion — research in adults with this condition found high rates — but many people never develop schizophrenia. Risk is raised, not destiny."[1][2]
Other mental health. ADHD, anxiety and social/communication differences are common and treatable. Mental health follow-up through adolescence and adulthood is recommended as part of good multi-system care.[2][3]
No preventive antipsychotic. Medicines are for diagnosed illness or clear severe symptoms after assessment — not routine prevention when he is well. Starting antipsychotics "just in case" exposes him to side-effects without proven preventive benefit in this setting.[3]
Watch for. New withdrawal, drop in function, odd beliefs, hearing voices, severe sleep change, talking to unseen people, or sudden school collapse — contact services early. Crisis contacts and written leaflet. Continue cardiac and calcium follow-up with medical teams.[3][4]
Close. Summarise, check understanding, offer genetics counsellor if recurrence questions arise, book review. Hope framed through surveillance and support, not false certainty. [2][3]
References
- [1]Murphy KC, Jones LA, Owen MJ High rates of schizophrenia in adults with velo-cardio-facial syndrome Arch Gen Psychiatry, 1999.PMID 10530637
- [2]Schneider M, Debbané M, Bassett AS, et al. Psychiatric disorders from childhood to adulthood in 22q11.2 deletion syndrome Am J Psychiatry, 2014.PMID 24577245
- [3]Bassett AS, McDonald-McGinn DM, Devriendt K, et al. Practical guidelines for managing patients with 22q11.2 deletion syndrome J Pediatr, 2011.PMID 21570089
- [4]McDonald-McGinn DM, Sullivan KE, Marino B, et al. 22q11.2 deletion syndrome Nat Rev Dis Primers, 2015.PMID 27189754
- [5]Dykens EM Measuring behavioral phenotypes: provocations from the "new genetics" Am J Ment Retard, 1995.PMID 7779347