Psych CASC / OSCE · Specialty psychiatry — sleep medicine interface
Explain OSA, CPAP, and sedative risks to a patient with depression — CASC communication station
MRCPsych/FRANZCP-style communication station: explain OSA–mood link, need for sleep testing, CPAP rationale, deprescribing temazepam, driving safety, collaborative plan.
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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. Build rapport with an irritated patient; explain why symptoms may reflect obstructive sleep apnoea as well as depression; outline screening clues and need for a sleep study; explain CPAP in plain language and mood benefits of treating the airway; negotiate a temazepam reduction plan; check driving safety; use teach-back. Examiner may play patient or partner. [2][3][4]
Candidate scenario
Residual depressive symptoms, high BMI, partner-confirmed snoring and apnoeas, nightly temazepam for 18 months, drives to work. No active suicidal ideation today. Open to evidence but defensive about weight and masks. [1][6]
Marking domains
- Empathy without colluding with indefinite benzodiazepine escalation
- Accurate plain-language OSA model (airway collapse, oxygen dips, unrefreshing sleep)
- Link to depression without blaming the patient [1][6]
- STOP-BANG-type risk explanation and sleep study rationale [2]
- CPAP as first-line for moderate–severe disease; adherence matters; mood can improve [3][4]
- Honest discussion that tablets do not open the airway and may worsen breathing safety [5]
- Driving caution if sleepy; collaborative written plan and follow-up
Reveal assessor key
Open. "I can see how frustrating it is still feeling exhausted after trying antidepressants — and I hear you want better sleep. Can we look at a medical sleep problem that often sits alongside depression?" [1]
Model. Night-time airway narrowing causes pauses and broken sleep; you can sleep long hours and still feel wiped. Weight and alcohol make it worse; it is common and treatable, not a character flaw. [2][6]
Plan. Sleep study referral; start weight and alcohol changes; do not increase temazepam — we will taper carefully while we treat the real problem. If OSA is moderate or severe, a CPAP machine keeps the airway open; many people feel brighter mood and energy when they use it regularly. [3][4][5]
Safety. If you are nodding off while driving, we need to pause driving until assessed — that protects you and others. [3]
Close. Written plan, partner included if patient agrees, teach-back of one reason we are not raising temazepam, follow-up date. [5]
Common fails
- Lecturing or weight-shaming
- Agreeing to indefinite higher-dose temazepam
- Describing CPAP as optional gadget without first-line framing
- Ignoring partner collateral
- No driving advice when EDS is present
- Forgetting that depression still needs concurrent psychiatric care. [1][3][5]
References
- [1]Gupta MA, Simpson FC Obstructive sleep apnea and psychiatric disorders: a systematic review J Clin Sleep Med, 2015.PMID 25406268
- [2]Chung F, Subramanyam R, Liao P, et al. High STOP-Bang score indicates a high probability of obstructive sleep apnoea Br J Anaesth, 2012.PMID 22401881
- [3]Patil SP, Ayappa IA, Caples SM, et al. Treatment of Adult Obstructive Sleep Apnea With Positive Airway Pressure J Clin Sleep Med, 2019.PMID 30736888
- [4]Edwards C, Mukherjee S, Simpson L, et al. Depressive Symptoms before and after Treatment of Obstructive Sleep Apnea in Men and Women J Clin Sleep Med, 2015.PMID 25902824
- [5]Mason M, Cates CJ, Smith I Effects of opioid, hypnotic and sedating medications on sleep-disordered breathing Cochrane Database Syst Rev, 2015.PMID 26171909
- [6]Peppard PE, Szklo-Coxe M, Hla KM, et al. Longitudinal association of sleep-related breathing disorder and depression Arch Intern Med, 2006.PMID 16983048