Psych CASC / OSCE · Foundations — EEG and clinical neurophysiology
Explain EEG and clozapine seizure risk to a patient and partner — CASC communication station
MRCPsych/FRANZCP-style CASC: neurophysiology communication, clozapine counselling, and safety netting without overclaim.
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Target exams
Station brief
Format. Communication station, approximately 7–10 minutes after reading. You are the psychiatry registrar on the inpatient unit. [1]
Candidate instructions. Build rapport with patient and partner. Explain what EEG is (safe recording of brain electrical activity) and what it cannot do (prove schizophrenia; a normal result does not exclude all seizure risk). Discuss clozapine and seizures in plain language: recognised dose-related risk, monitoring and review plan, not automatic permanent abandonment if still needed. Address staring spells as possible seizures needing proper assessment (including EEG when indicated). Outline joint care with neurology, safety advice after a first seizure (driving local rules as appropriate, bathing/heights), and invite questions. Avoid jargon dumps and false certainty. [1][2][3][4]
Candidate scenario
Partner may say: 'We want a brain scan that proves the diagnosis,' 'Has clozapine destroyed the brain?' and 'If EEG is normal, seizures cannot happen.' Respond accurately: diagnosis of schizophrenia is clinical; EEG looks for seizure activity and other electrical patterns; clozapine can increase seizure risk especially at higher doses; normal EEG does not make future seizures impossible; staring spells need careful review because quiet seizures can occur without shaking. [1][3][4]
Marking domains
- Empathy, plain language, collaborative stance
- Accurate EEG purpose and limits [1]
- Clozapine seizure risk without catastrophic abandonment framing [2][3]
- NCSE/staring-spell safety awareness [4][5]
- Shared plan with neurology and monitoring
- Driving/safety netting appropriate to region without inventing legal section numbers
- Hope regarding continued psychosis treatment options
Reveal assessor key
Open. Introduce role; check understanding of the seizure and fears about brain damage. [3]
EEG explanation. Painless sensors on the scalp record brain electrical activity. Helps look for seizure patterns or other medical brain network problems. Does not print a personal 'schizophrenia photo.' Normal EEG is reassuring but not a lifetime guarantee against seizures. [1]
Clozapine. Effective for treatment-resistant psychosis; can lower the threshold for seizures, especially with higher doses or levels — we check levels, other medicines, smoking changes, and may adjust dose or add seizure-preventing medicine with specialist advice. Stopping suddenly without a plan can risk psychosis relapse. [2][3]
Staring spells. Could be quiet seizures or other causes; we take them seriously and may use longer EEG monitoring if needed. [4][5]
Close. Summarise next steps (investigations, neurology input, safety advice, follow-up); invite questions; safety-net for further seizures or reduced responsiveness. [3][4]
References
- [1]O'Sullivan SS, Mullins GM, Cassidy EM, et al. The role of the standard EEG in clinical psychiatry Hum Psychopharmacol, 2006.PMID 16783810
- [2]Centorrino F, Price BH, Tuttle M, et al. EEG abnormalities during treatment with typical and atypical antipsychotics Am J Psychiatry, 2002.PMID 11772698
- [3]Devinsky O, Honigfeld G, Patin J Clozapine-related seizures: experience with 5,629 patients Neurology, 1994.PMID 7991106
- [4]Beniczky S, Hirsch LJ, Kaplan PW, et al. Unified EEG terminology and criteria for nonconvulsive status epilepticus Epilepsia, 2013.PMID 24001066
- [5]Herman ST, Abend NS, Bleck TP, et al. Consensus statement on continuous EEG in critically ill adults and children, part I: indications J Clin Neurophysiol, 2015.PMID 25626778