Psych CASC / OSCE · Addiction psychiatry — inhalant-related disorders
Explain chroming risks and N2O numbness without stigma — CASC communication station
MRCPsych/FRANZCP-style communication station: explain sudden sniffing death risk in plain language, absence of licensed anti-craving standard, psychosocial plan, family product access, and N2O myeloneuropathy warning without stigma.
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Target exams
Station brief
Format. Communication station, approximately 7–10 minutes active time after reading. You are the psychiatry/addiction registrar. Examiner may play adolescent and/or parent. [1]
Candidate instructions. Engage without stigma. Explain in plain language why chroming can cause sudden death even in young people, especially with exercise or fright. Respond honestly that there is no approved methadone-like medicine for paint/petrol sniffing. Outline psychosocial and family steps (including product access). Mention nitrous oxide nerve/spinal risk and when to seek care. Check understanding and agree a safety and follow-up plan. [2][3][5]
Candidate scenario
Medically cleared after near-blackout following paint bagging and running. Mother demands a craving tablet "like methadone." Youth minimises. Friends use N2O; one has foot numbness. You propose youth AOD engagement, family product security, honest cardiac risk counselling, and medical review pathway if N2O neurological symptoms appear. [1][4]
Marking domains
- Empathy, structure, non-stigmatising language with adolescent and parent
- Accurate plain-language model of sudden sniffing death (heart rhythm after solvents/hydrocarbons, exertion/fright)
- Honest explanation of no approved anti-craving/substitution standard
- Psychosocial plan and family product-access strategies
- N2O myeloneuropathy warning and stop-use / medical review message
- Collaborative safety plan and teach-back [2][4][5][6]
Reveal assessor key
Open. Name time; ask youth and parent top concerns (craving tablet, "just kids stuff," fear of death, school). [1]
Explain chroming and sudden death. "Solvents in spray paint can make the heart more sensitive. If someone then runs hard, gets a fright, or gets a big adrenaline surge, the heart can go into a dangerous rhythm and people can die suddenly — even the first times they use. Your blackout while running is exactly the kind of situation we take seriously." [2][3]
No methadone-for-paint. "For heroin there are licensed medicines like methadone that replace and stabilise. For chroming and petrol sniffing, research has not produced an approved replacement or anti-craving tablet as standard care. What helps is structured support — counselling, youth drug and alcohol services, family work, keeping products locked away, and treating other mental health problems if present." [5][6]
N2O warning. "Nitrous oxide balloons can damage the nerves and spinal cord by interfering with vitamin B12. Numb feet, unsteady walking, or pins and needles need urgent medical review — stop the balloons and get checked; treatment can include vitamin B12 injections." [4]
Plan. Safety (no solitary bagging, no running/heavy exertion right after use — ideally stop use), product security at home, youth AOD appointment, crisis contacts, when to return to ED (chest pain, collapse, progressive numbness), teach-back. [1][3]
Close. Summarise; check understanding; written info if available. [1]
References
- [1]Howard MO, Bowen SE, Garland EL, et al. Inhalant use and inhalant use disorders in the United States Addict Sci Clin Pract, 2011.PMID 22003419
- [2]Bass M Sudden sniffing death JAMA, 1970.PMID 5467774
- [3]Berling I, Buckley NA, Isoardi KZ Rare but relevant: Hydrocarbons and sudden sniffing syndrome Addiction, 2025.PMID 40275758
- [4]Swart G, Blair C, Lu Z, et al. Nitrous oxide-induced myeloneuropathy Eur J Neurol, 2021.PMID 34427020
- [5]Konghom S, Verachai V, Srisurapanont M, et al. Treatment for inhalant dependence and abuse Cochrane Database Syst Rev, 2010.PMID 21154379
- [6]MacLean S, Cameron J, Harney A, Lee NK Psychosocial therapeutic interventions for volatile substance use: a systematic review Addiction, 2012.PMID 22248138