Psych CASC / OSCE · Intellectual disability psychiatry — neurodevelopmental dual diagnosis
Explain dual diagnosis, AAC and behaviour plan to carers — CASC communication station
MRCPsych/FRANZCP-style communication station: explain ASD+ID dual diagnosis without jargon overload, AAC as treatment, epilepsy awareness, PBS-first behaviour plan, and selective irritability medication only after formulation.
On this page & tools
Target exams
Station brief
Format. Communication station, approximately 7–10 minutes active time after reading. You are the CAMHS / dual-diagnosis psychiatry registrar in the neurodevelopmental clinic. [1]
Candidate instructions. Explain dual diagnosis of autism and intellectual disability to the parents, outline assessment logic in plain language, discuss communication and AAC, mention epilepsy awareness without alarming, describe a behaviour plan that puts medical and PBS steps first, and only then address medicines for severe irritability if needed. Check understanding and safety. The examiner plays both parents. [1][2]
Candidate scenario
Your patient is 9, with moderate intellectual disability confirmed on adaptive and cognitive assessment. Multidisciplinary review finds social-communication skills below his developmental level, restricted interests, and sameness distress — meeting ASD criteria as well. He has limited speech and daily head-hitting when overloaded. Parents ask: "Does that mean two diseases? Did we cause this? Should he get a tablet for autism? He stares into space — is that a fit? Will he ever communicate?" [1][2]
Marking domains
- Empathy, structure, agenda-setting; reject parental blame
- Plain-language dual diagnosis: both labels when both true; social skills relative to developmental level
- AAC and total communication as active treatments, not failure of speech
- Epilepsy vigilance (staring spells → medical review) without saying all movements are seizures
- Behaviour plan: pain/medical check, functional analysis/PBS, environment, supports
- Medicines only for severe irritability after formulation; name monitoring if discussing risperidone/aripiprazole; no tablet treats core autism
- Safety-net and follow-up; checks understanding [1][3][4][5]
Reveal assessor key
Open. Thank them; name the time; ask main worries first. Explicitly reject blame — dual neurodevelopmental conditions have strong biological contributors; not caused by cold parenting or vaccines.[1]
Explain dual diagnosis. "Intellectual disability describes broader learning and daily living support needs. Autism describes a particular pattern of social connection, communication style, and need for sameness or sensory differences. He can have both when social skills are more affected than we would expect for his overall developmental level." Avoid hopeless absolute predictions; emphasise support intensity.[1][2]
Communication. "We will not wait for speech alone. We use total communication — pictures, devices, gestures, visual schedules — so he can express needs. That often reduces frustration behaviours." Offer speech-language pathway and AAC trial language.[1]
Staring spells. "Not every stare is a seizure, and not every repetitive movement is a seizure — but new or suspicious spells deserve medical and neurology review because epilepsy is more common when autism and intellectual disability occur together."[3]
Behaviour and medicines. "First we look for pain, illness, overload, and communication gaps, and we build a positive behaviour plan. There is no tablet that removes autism itself. If severe self-injury continues after those steps, medicines such as risperidone or aripiprazole can reduce irritability for some children, with careful weight and metabolic monitoring."[4][5]
Close. Summarise, invite questions, safety-net for escalating self-injury or possible seizures, written information, review date. [1]
References
- [1]Hyman SL, Levy SE, Myers SM Identification, Evaluation, and Management of Children With Autism Spectrum Disorder Pediatrics, 2020.PMID 31843864
- [2]Thurm A, et al. State of the Field: Differentiating Intellectual Disability From Autism Spectrum Disorder Front Psychiatry, 2019.PMID 31417436
- [3]Lukmanji S, et al. The co-occurrence of epilepsy and autism: A systematic review Epilepsy Behav, 2019.PMID 31398688
- [4]McCracken JT, et al. Risperidone in children with autism and serious behavioral problems N Engl J Med, 2002.PMID 12151468
- [5]Owen R, et al. Aripiprazole in the treatment of irritability in children and adolescents with autistic disorder Pediatrics, 2009.PMID 19948625