Psych CASC / OSCE · General adult psychiatry — impulse control
Explain intermittent explosive disorder and safety plan — CASC communication station
MRCPsych/FRANZCP-style communication station: explain IED without pejorative labels, outline CBT and fluoxetine evidence honestly, address partner safety and confidentiality limits, check understanding.
On this page & tools
Target exams
Station brief
Format. Communication station, approximately 7–10 minutes active time after reading. You are the psychiatry registrar in the outpatient clinic. [1]
Candidate instructions. Explain intermittent explosive disorder in clear non-stigmatising language, separate it from “psychopath,” outline psychological and medication options with honest evidence limits, address partner safety and confidentiality limits when others are at risk, and check understanding. The examiner plays the patient. [1][3]
Candidate scenario
Your patient has recurrent impulsive explosive outbursts out of proportion to minor stressors, property damage, remorse afterward, and no clear manic or psychotic syndrome. Alcohol use is moderate–heavy. His partner is frightened but not currently in the room with a timed plan of immediate harm disclosed. He is not psychotic. [1][4]
Marking domains
- Empathy and structure without colluding with minimisation or shame spirals
- Accurate plain-language explanation of IED (impulsive, disproportionate attacks)
- Clear distinction from psychopathy/ASPD stereotypes
- Honest treatment discussion (CBT skills; fluoxetine evidence; no miracle pill)
- Partner safety, confidentiality limits, collaborative goals
- Teach-back and follow-up plan [2][3]
Reveal assessor key
Open and agenda-set. Name time; acknowledge frustration at the label; ask what he has already been told. [1]
Explain diagnosis. “Intermittent explosive disorder describes repeated sudden anger attacks that are much bigger than the trigger — shouting, throwing or breaking things, sometimes hitting — that are not carefully planned to get money or control. Afterward people often feel guilty. It is a clinical diagnosis of impulse-control problems, not a moral insult and not the same as calling someone a psychopath.” [1]
Explain treatment. Skills-based psychological therapy (CBT for anger/aggression) helps people spot triggers early, calm the body, challenge ‘they meant to disrespect me’ thoughts, and choose safer responses — there is research support for this approach in IED. Medicines do not ‘cure personality,’ but an SSRI such as fluoxetine has trial evidence for reducing aggressive outbursts in IED; we would start low (for example 20 mg daily by mouth), review side-effects and response, and adjust carefully. We also need to tackle alcohol if it is pouring fuel on the fire. There is no single magic pill. [2][3]
Partner and confidentiality. Usual privacy applies, but if we believe someone is in serious danger we may need to share limited information to keep them safe — we will be as open as safety allows. We can help with a safety plan and support options for your partner. [1]
Close. Agree goals (attack diary, CBT referral, consider fluoxetine, alcohol plan, early review), teach-back, written information, hope without false promises. [2][3]
Examiner pitfalls to watch
- Collapsing IED into “psychopath” or refusing all treatment
- Overpromising cure with medication alone
- Ignoring partner safety
- Using jargon without checking understanding
- Recommending chronic benzodiazepines as the main plan [1]
References
- [1]Coccaro EF Intermittent explosive disorder as a disorder of impulsive aggression for DSM-5 Am J Psychiatry, 2012.PMID 22535310
- [2]Coccaro EF, Lee RJ, Kavoussi RJ A double-blind, randomized, placebo-controlled trial of fluoxetine in patients with intermittent explosive disorder J Clin Psychiatry, 2009.PMID 19389333
- [3]McCloskey MS, Noblett KL, Deffenbacher JL, et al. Cognitive-behavioral therapy for intermittent explosive disorder: a pilot randomized clinical trial J Consult Clin Psychol, 2008.PMID 18837604
- [4]Kessler RC, Coccaro EF, Fava M, et al. The prevalence and correlates of DSM-IV intermittent explosive disorder in the National Comorbidity Survey Replication Arch Gen Psychiatry, 2006.PMID 16754840