Psych CASC / OSCE · Specialty psychiatry — sleep medicine interface
Explain suspected narcolepsy, MSLT, and driving advice — CASC communication station
MRCPsych/FRANZCP-style communication station: explain likely narcolepsy type 1, why sleep studies matter, temporary driving risk, and treatment options without colluding with unsafe work.
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Target exams
Station brief
Format. Communication station, approximately 7–10 minutes after reading. You are the psychiatry registrar in outpatient clinic. [1]
Candidate instructions. Validate the patient’s experience, explain that the story fits a sleep–wake brain disorder (likely narcolepsy with cataplexy) rather than laziness, outline why PSG/MSLT is needed, give clear driving/work safety advice after a near-miss, and preview evidence-based treatments (scheduled naps, wake promoters such as modafinil-class agents, anticataplexy options) without promising an immediate unrestricted return to night driving. Check understanding. The examiner plays the patient. [1][2][3]
Candidate scenario
The patient works night shifts delivering food, had one near-miss after nodding at a light, and fears losing their job. They deny heavy snoring. Mood is low secondarily to functional loss. No active suicidal plan. They want “whatever tablet truck drivers use” tonight. [3]
Marking domains
- Empathy without colluding with unsafe driving/work
- Plain-language explanation of EDS and cataplexy (consciousness preserved)
- Clear plan for sleep studies after adequate sleep opportunity [5]
- Temporary driving cessation advice and documentation tone [3]
- Treatment overview: behavioural naps; modafinil-class for EDS; cataplexy options (oxybate/antidepressants) via specialist pathways [4][6]
- Teach-back and safety-net
Reveal assessor key
Open. “I believe you — this does not sound like laziness. It sounds like a treatable sleep–wake condition where the brain’s alertness system is unstable.” [1]
Cataplexy. “When strong emotion briefly turns the muscles off but you stay aware, we call that cataplexy — a hallmark of narcolepsy type 1, not a faint or a performance.” [2]
Tests. “We confirm with an overnight sleep study then a daytime nap test (MSLT), done after enough sleep opportunity so the results mean something.” [5]
Safety. “After a near-miss, continuing night driving tonight is not safe. We need temporary stop/restriction per local rules while we assess and treat — I will help with work documentation language.” [3]
Treatment. “Planned short naps help. Medicines that promote wakefulness (such as modafinil-class agents where appropriate) and medicines for cataplexy can restore function; we start carefully with monitoring and sleep-specialist input.” [4][6]
Close. Written plan, urgent sleep referral, crisis contacts if mood worsens, teach-back of one safety action today. [3]
Common fails
- Agreeing they can keep night driving “if careful”
- Calling them malingering or purely depressed without sleep formulation
- Ordering antipsychotics for hypnagogic phenomena with insight
- Promising a cure tablet without tests or safety planning
- Failing to name cataplexy or MSLT in plain language [1][2][5]
References
- [1]Scammell TE Narcolepsy N Engl J Med, 2015.PMID 26716917
- [2]Dauvilliers Y, Arnulf I, Mignot E Narcolepsy with cataplexy Lancet, 2007.PMID 17292770
- [3]Bassetti CLA, Kallweit U, Vignatelli L, et al. European guideline and expert statements on the management of narcolepsy in adults and children J Sleep Res, 2021.PMID 34173288
- [4]Maski K, Trotti LM, Kotagal S, et al. Treatment of central disorders of hypersomnolence: an American Academy of Sleep Medicine clinical practice guideline J Clin Sleep Med, 2021.PMID 34743789
- [5]Littner MR, Kushida C, Wise M, et al. Practice parameters for clinical use of the multiple sleep latency test and the maintenance of wakefulness test Sleep, 2005.PMID 15700727
- [6]US Modafinil in Narcolepsy Multicenter Study Group Randomized trial of modafinil as a treatment for the excessive daytime somnolence of narcolepsy Neurology, 2000.PMID 10720292