Psych CASC / OSCE · General adult psychiatry — mood disorders
Explain psychotic depression and combination treatment — CASC communication station
MRCPsych/FRANZCP-style communication station: explain psychotic depression without stigma, combination AD+AP rationale, monitoring, continuation after remission, ECT as contingency, and differential from schizophrenia.
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Target exams
Station brief
Format. Communication station, approximately 7–10 minutes active time after reading. You are the psychiatry registrar on the inpatient unit preparing discharge education. [3]
Candidate instructions. Explain what psychotic depression means, why both an antidepressant and an antipsychotic are used, what monitoring is needed, why the antipsychotic may continue for a period after mood improves, how this differs from schizophrenia, safety-net suicide risk, and when ECT is considered. Check understanding. The examiner plays the patient; a second role may play the partner. [3]
Candidate scenario
She improved on sertraline and olanzapine after guilt delusions that she had ruined her children. She wants to stop olanzapine immediately because of weight gain fear and stigma about "antipsychotics meaning schizophrenia." Partner asks if she will "always be psychotic." [1][2]
Marking domains
- Empathy, structure, agenda-setting with patient and partner
- Accurate non-stigmatising explanation of depression with psychotic features
- Clear combination treatment rationale (both poles)
- Metabolic monitoring explained honestly
- Continuation logic without scaring or minimising (STOP-PD II concept in plain language)
- Differentiates from schizophrenia without over-promising
- Safety-netting for return of suicidal or delusional ideas
- Teach-back [1][2][3]
Reveal assessor key
Open and agenda-set. Name time; ask top worries (weight, schizophrenia label, stopping medicines). [3]
Explain diagnosis. "You had a severe depression that also included false beliefs driven by the illness — we call that depression with psychotic features. It is still a mood disorder diagnosis, not automatically schizophrenia. Schizophrenia is a different long-term pattern where psychosis is the main ongoing problem." [3]
Explain combination. "The antidepressant treats the depression; the antipsychotic treats the psychotic symptoms and helps the overall illness settle. Research including a major trial (STOP-PD) found that combining a medicine like sertraline with olanzapine worked better than olanzapine with placebo for this condition." [1]
Continuation. "After people get better on both, continuing the antipsychotic for a period with the antidepressant can reduce the chance of the illness coming back quickly — that was the message of a follow-up trial (STOP-PD II). We balance that against side-effects like weight gain, and we monitor weight, blood sugar and lipids. We do not stop suddenly without a plan." [2]
ECT. "If depression had been life-threatening — for example not eating, or very high suicide risk — we would discuss ECT, which has strong evidence in severe depression. It was not required in her course so far." [4]
Safety. If guilt, voices, or death wishes return, contact the team/crisis services the same day. Provide written information; teach-back close. Note elevated suicide risk phenotype in psychotic depression historically — take new risk seriously. [5][3]
References
- [1]Meyers BS, Flint AJ, Rothschild AJ, et al. STOP-PD: olanzapine plus sertraline vs olanzapine plus placebo for psychotic depression Arch Gen Psychiatry, 2009.PMID 19652123
- [2]Flint AJ, Meyers BS, Rothschild AJ, et al. STOP-PD II: continuing olanzapine vs placebo after remission of psychotic depression JAMA, 2019.PMID 31429896
- [3]Malhi GS, Bell E, Bassett D, et al. The 2020 RANZCP clinical practice guidelines for mood disorders Aust N Z J Psychiatry, 2021.PMID 33353391
- [4]UK ECT Review Group Efficacy and safety of electroconvulsive therapy in depressive disorders Lancet, 2003.PMID 12642045
- [5]Gournellis R, et al. Psychotic (delusional) depression and completed suicide: a systematic review and meta-analysis Ann Gen Psychiatry, 2018.PMID 30258483