Psych CASC / OSCE · Emergency psychiatry
Explaining overdose care and means restriction after self-poisoning — CASC communication station
MRCPsych/FRANZCP-style communication station: explain mixed OD care, paracetamol/NAC rationale, relative toxicity without scaremongering, restart planning, means restriction, and collaborative safety planning.
On this page & tools
Target exams
Station brief
Format. Communication station, approximately 7–10 minutes after reading time. You are the psychiatry registrar on the medical short-stay unit. [4]
Candidate instructions. Explain what happened in plain language: why monitoring, blood tests, and N-acetylcysteine were used for paracetamol risk; that venlafaxine overdose can be more serious than many people expect from “newer antidepressants”; that stopping all future treatment forever is not usually the goal; and how to reduce risk (means restriction, follow-up, safer prescribing). Acknowledge anger, check understanding, involve both patient and mother, and avoid jargon. [1][2]
Candidate scenario
Patient: “I just wanted the pain in my head to stop. Am I going to get liver failure?” Mother: “These medicines nearly killed her. We want them banned.” Observations are stable; NAC course is completing per protocol. [2][3]
Marking domains
- Empathy without defensiveness
- Clear explanation of paracetamol risk and NAC purpose
- Accurate, non-alarmist relative toxicity (venlafaxine vs many SSRIs/TCAs context)
- Restart planning is individualised, not “tonight automatically” or “never forever”
- Means restriction and crisis plan
- Shared decision-making and teach-back
- Safety-netting and follow-up [1][2][4]
Reveal assessor key
Open. Introduce role; acknowledge fear and anger; state priority was keeping her safe and protecting the liver and heart/brain from toxin effects. [4]
Medical explanation. Paracetamol can damage the liver hours after overdose even if someone looks well early. Blood levels and a treatment chart (nomogram) guide risk. N-acetylcysteine protects the liver and works best when given early — that is why it was started promptly when indicated.[2][3]
Venlafaxine context. Some antidepressants are more dangerous than others in overdose. Venlafaxine can cause seizures and other serious effects more often than many SSRIs in comparative overdose data. That does not mean all antidepressants are “poison,” but it does mean future choices and how medicines are stored and dispensed matter.[1]
Restart plan. Do not simply restart a full stockpile tonight. Depression still needs care. Plan a supervised review: safer agent selection if appropriate, smaller quantities, frequent follow-up, and address the crisis that led to the attempt. Stopping everything forever can leave illness untreated and increase risk long-term.[1][4]
Means restriction. Remove leftover tablets from the home, use blister packs or staged dispensing, involve trusted supports, provide crisis numbers, and arrange urgent psychiatric/GP follow-up. Offer written information. [4]
Close. Teach-back (“Can you tell me the two things we are doing for the liver and for safety at home?”), answer questions, document, confirm next appointment. [2]
References
- [1]Whyte IM, Dawson AH, Buckley NA Relative toxicity of venlafaxine and selective serotonin reuptake inhibitors in overdose compared to tricyclic antidepressants. QJM, 2003.PMID 12702786
- [2]Bateman DN, Dear JW, Thanacoody HK, Thomas SHL Fifty years of paracetamol (acetaminophen) poisoning: the development of risk assessment and treatment 1973-2023 with particular focus on contributions published from Edinburgh and Denver. Clin Toxicol (Phila), 2023.PMID 38197864
- [3]Smilkstein MJ, Knapp GL, Kulig KW, Rumack BH Efficacy of oral N-acetylcysteine in the treatment of acetaminophen overdose. Analysis of the national multicenter study (1976 to 1985). N Engl J Med, 1988.PMID 3059186
- [4]Parris MA, Ragan FA, Lin A Found Down: Approach to the Patient with an Unknown Poisoning. Emerg Med Clin North Am, 2022.PMID 35461619