Psych CASC / OSCE · Specialty psychiatry — eating disorders
Explain anorexia nervosa care and refeeding safety to a parent — CASC communication station
MRCPsych/FRANZCP-style communication station: explain AN, medical risk, refeeding, FBT, and limits of medication to a carer.
On this page & tools
Target exams
Station brief
Format. Communication station, approximately 7–10 minutes active time after reading. You are the psychiatry registrar on the paediatric/adolescent medical ward with eating disorder liaison. [5]
Candidate instructions. Explain the diagnosis of anorexia nervosa in plain language, why medical monitoring matters (heart rate, electrolytes), what refeeding syndrome is and how the team prevents it, why family-based treatment is recommended after stabilisation, and give a balanced answer on medication (not first-line in this adolescent scenario). Check understanding and invite questions. The examiner plays the parent. [1][2][5]
Candidate scenario
Your patient meets criteria for restricting anorexia nervosa with medical instability on admission (bradycardia). The team is refeeding with protocolised monitoring of phosphate, potassium and magnesium. After medical stability, the plan is outpatient/day FBT with parents taking charge of meals initially. The parent fears “force-feeding will destroy trust” and asks whether a “weight-gain tablet” (olanzapine) would be simpler. [1][2][3][4]
Marking domains
- Empathy, structure, non-blaming stance toward parents
- Accurate plain-language model of AN (restriction, fear of weight gain, body image)
- Clear explanation of medical risk (bradycardia, collapse, multi-system effects)
- Refeeding syndrome: phosphate/electrolytes, why monitoring and thiamine/protocol matter
- FBT rationale and phases at carer level; evidence that family leadership helps
- Medication: not first-line fix for adolescent AN; olanzapine evidence mainly adult adjunct
- Safety-net and collaboration; teach-back [1][2][4][5]
Reveal assessor key
Open and agenda-set. Thank parent; name time; ask top worries (trust, force-feeding, medication shortcut). [5]
Explain AN. “Anorexia nervosa is an illness where fear of weight gain and body image disturbance drive severe restriction. It is not a choice or bad parenting.” [5]
Medical risk. Slow heart rate and low weight mean the body is in starvation mode; collapse and heart rhythm problems are why we admit and monitor. Exercise is unsafe until medically cleared.[3]
Refeeding. When we restart nutrition, shifts in minerals — especially phosphate — can stress the heart and breathing. We prevent this with a planned feeding protocol, vitamins (including thiamine), and frequent blood tests, not by avoiding food forever.[2]
FBT. After medical safety, the best-evidenced therapy for most teens is family-based treatment: parents temporarily take charge of renourishment, then gradually return control. Research shows this outperforms some individual approaches for recovery. It is skilled support, not blame.[1]
Medication. There is no simple “cure tablet.” Olanzapine has some adult research as an add-on for weight, with side-effects; it is not the first step for a medically unstable adolescent and does not replace feeding and family therapy.[4]
Close. Summarise, teach-back, written information, how to contact the team if dizziness, chest symptoms, or refusal of all intake worsens. [5]
References
- [1]Lock J, Le Grange D, Agras WS, et al. Randomized clinical trial comparing family-based treatment with adolescent-focused individual therapy for adolescents with anorexia nervosa Arch Gen Psychiatry, 2010.PMID 20921118
- [2]Society for Adolescent Health and Medicine Refeeding hypophosphatemia in hospitalized adolescents with anorexia nervosa: a position statement of the Society for Adolescent Health and Medicine J Adolesc Health, 2014.PMID 25151056
- [3]Sachs KV, Harnke B, Mehler PS, et al. Cardiovascular complications of anorexia nervosa: A systematic review Int J Eat Disord, 2016.PMID 26710932
- [4]Attia E, Steinglass JE, Walsh BT, et al. Olanzapine Versus Placebo in Adult Outpatients With Anorexia Nervosa: A Randomized Clinical Trial Am J Psychiatry, 2019.PMID 30654643
- [5]Society for Adolescent Health and Medicine Medical Management of Restrictive Eating Disorders in Adolescents and Young Adults J Adolesc Health, 2022.PMID 36058805