Psych CASC / OSCE · Child and adolescent psychiatry — DMDD
Explain DMDD vs bipolar and the care plan to parents — CASC communication station
MRCPsych/FRANZCP-style communication station: explain DMDD in plain language, distinguish from bipolar, outline parent training and school plan, ADHD treatment rationale, and balanced discussion of when medication might be considered later.
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Target exams
Station brief
Format. Communication station, approximately 7–10 minutes. You are the CAMHS registrar. The examiner plays one or both parents.[1][2]
Candidate instructions. Explain the diagnosis of disruptive mood dysregulation disorder in plain language, how it differs from bipolar disorder, the plan for parent training and school support, why treating ADHD matters, and a balanced view of medication (not lithium first-line for this pattern). Check understanding and respond to fear of "missing bipolar."[1][4][5]
Candidate scenario
The child has 18 months of nearly continuous irritable mood and multiple weekly outbursts at home and school, onset of problems well before age 10, ADHD symptoms, and no history of elevated mood with decreased need for sleep or grandiosity. Parents demand lithium today after reading about childhood bipolar online.[1][2]
Marking domains
- Empathy and agenda-setting with exhausted parents
- Accurate plain-language DMDD explanation (chronic irritability + outbursts; multi-setting)
- Clear distinction from episodic bipolar mania
- Psychosocial plan named (parent training, school plan) and ADHD treatment rationale
- Balanced medication discussion; lithium not first-line for this phenotype
- Safety-netting for aggression/crisis and follow-up
- Teach-back / checks understanding [1][4][5]
Reveal assessor key
Open. Name time; ask parents' main fears (bipolar, school exclusion, lithium). Validate exhaustion and love for their child; shared goal is safety and fewer explosions.[1]
Explain diagnosis. "Your child has a pattern we call disruptive mood dysregulation disorder — a long-lasting very irritable mood most days plus frequent huge temper outbursts that are out of proportion and happen in more than one place, like home and school. This has gone on for many months. It is a real, impairing condition — not just 'naughty behaviour'."[1]
Distinguish bipolar. "Classic bipolar involves distinct episodes of unusually high or wired mood, much less need for sleep, and big increases in energy or grand ideas for days. Your child's story is more a continuous short fuse without those clear high episodes. Research on this chronic irritability pattern shows it more often links later to anxiety and low mood than to inevitable mania — so we do not automatically treat it as bipolar."[2][3]
Plan. "First steps that work best are structured parenting strategies (clear expectations, calm consistent consequences, catching good behaviour), a school behaviour plan, and treating ADHD if present because impulsivity pours fuel on the fire. Group parent–child programmes studied for severe irritability build on those ideas. We track outbursts weekly."[5]
Medication. "We are not starting lithium today. A carefully done trial of lithium for this chronic irritability pattern did not beat placebo. Medication can be considered later for residual severe symptoms under specialist care, after behavioural and ADHD treatment are optimised — and if we use an antidepressant adjunct we monitor closely for agitation or suicidal thoughts. If aggression becomes immediately dangerous we have a crisis plan."[4][5]
Close. Summarise, teach-back, written plan and crisis contacts, book review, offer school liaison letter.[1]
References
- [1]Roy AK, Lopes V, Klein RG Disruptive mood dysregulation disorder: a new diagnostic approach to chronic irritability in youth Am J Psychiatry, 2014.PMID 25178749
- [2]Leibenluft E Severe mood dysregulation, irritability, and the diagnostic boundaries of bipolar disorder in youths Am J Psychiatry, 2011.PMID 21123313
- [3]Copeland WE, Shanahan L, Egger H, et al. Adult diagnostic and functional outcomes of DSM-5 disruptive mood dysregulation disorder Am J Psychiatry, 2014.PMID 24781389
- [4]Dickstein DP, Towbin KE, Van Der Veen JW, et al. Randomized double-blind placebo-controlled trial of lithium in youths with severe mood dysregulation J Child Adolesc Psychopharmacol, 2009.PMID 19232024
- [5]Waxmonsky JG, Waschbusch DA, Belin P, et al. A Randomized Clinical Trial of an Integrative Group Therapy for Children With Severe Mood Dysregulation J Am Acad Child Adolesc Psychiatry, 2016.PMID 26903253