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Clinical Atlas Prestige · Evidence-first

Psych MEQs / SAQsIntellectual disability psychiatry

Psych MEQs / SAQs · Intellectual disability psychiatry

Epilepsy in intellectual disability — peri-ictal behaviour to SUDEP (MEQ)

FRANZCP-style MEQ on epilepsy in intellectual disability: McGrother epidemiology, peri-ictal formulation, Kerr-aligned joint care, seizure-aware psychotropics, SUDEP counselling.

20 marks20 min
On this page & tools

Target exams

FRANZCPMRCPsychABPNMD-DNB

Target exams

FRANZCPMRCPsychABPNMD-DNB
Prompt
A 34-year-old man with moderate intellectual disability and longstanding epilepsy lives in supported accommodation. He has weekly seizures despite two AEDs. Staff report escalating aggression. He is on levetiracetam (recently increased) and long-term risperidone 2 mg for 'behaviour' with no documented psychosis. (i) Outline the epidemiology of epilepsy in ID relevant to this case. (ii) Classify possible relationships between his epilepsy and behavioural change, including postictal psychosis and AED effects. (iii) Summarise acute safety priorities including why AEDs must not be stopped abruptly. (iv) Outline definitive joint management including psychotropic principles and non-drug care. (v) State key counselling on mortality/SUDEP and water safety. (20 marks)

Model answer

Reveal model answer

(i) Epidemiology. Epilepsy is far more common in ID than in the general population. McGrother et al. reported roughly 26% prevalence in adults with ID in service contact, with a large fraction still having seizures despite AEDs — matching this man's treatment-resistant pattern. Severity of ID tracks higher epilepsy rates; mortality is increased when seizures are ongoing.[1][2]

(ii) Relationships to behaviour. Map to peri-ictal timeline: pre-ictal irritability; ictal automatisms; immediate postictal confusion/aggression; postictal psychosis after cluster, often after a lucid interval (Logsdail/Toone); interictal mental illness; and AED psychiatric adverse effects (recent levetiracetam increase is highly relevant). Do not equate aggression with schizophrenia without criteria. Coexisting operant challenging behaviour may still need functional analysis.[3][4]

(iii) Acute safety. Protect from injury; follow personal epilepsy rescue plan (e.g. buccal midazolam thresholds); exclude medical drivers and nonconvulsive status if awareness does not recover. Do not stop AEDs abruptly — status risk. If postictal psychosis is suspected, prioritise safety and treat psychosis while liaising with neurology.[3][4]

(iv) Definitive management. Joint neurology–ID psychiatry review; seizure diary/video; rationalise AEDs; review levetiracetam for irritability before escalating antipsychotics; PBS and environmental strategies for non-psychotic behaviour; deprescribe risperidone if no mental illness indication once risk is controlled; if psychotropics needed, use seizure-aware choices and avoid high-risk agents such as bupropion; monitor metabolic effects of antipsychotics; capacity-supported decisions.[3][5][7]

(v) Mortality counselling. Discuss excess death risk with ongoing seizures, including SUDEP (risk rises with uncontrolled tonic–clonic and nocturnal seizures) and drowning/bathing safety, adherence supports, and night supervision strategies proportionate to risk — not fear without a plan.[2][6]

Common errors

  • Stopping AEDs for behaviour.
  • Ignoring levetiracetam psychiatric adverse effects.
  • Treating all aggression as primary psychosis.
  • Omitting SUDEP and water safety.
  • Inventing foreign Mental Health Act section numbers. [3][6]

Examiner notes

Award marks for McGrother order of magnitude, lucid-interval postictal psychosis, Kerr-style joint care, and explicit SUDEP counselling. Full marks require both neurological and ID psychiatry lenses. [1][3][4][6]

References

  1. [1]McGrother CW, Bhaumik S, Thorp CF, et al. Epilepsy in adults with intellectual disabilities: prevalence, associations and service implications Seizure, 2006.PMID 16782360
  2. [2]Robertson J, Hatton C, Emerson E, Baines S Mortality in people with intellectual disabilities and epilepsy: A systematic review Seizure, 2015.PMID 26076855
  3. [3]Kerr M, Scheepers M, Arvio M, et al. Consensus guidelines into the management of epilepsy in adults with an intellectual disability J Intellect Disabil Res, 2009.PMID 19527434
  4. [4]Logsdail SJ, Toone BK Post-ictal psychoses. A clinical and phenomenological description Br J Psychiatry, 1988.PMID 3167343
  5. [5]Alper K, Schwartz KA, Kolts RL, Khan A Seizure incidence in psychopharmacological clinical trials: an analysis of Food and Drug Administration (FDA) summary basis of approval reports Biol Psychiatry, 2007.PMID 17223086
  6. [6]Devinsky O, Hesdorffer DC, Thurman DJ, Lhatoo S, Richerson G Sudden unexpected death in epilepsy: epidemiology, mechanisms, and prevention Lancet Neurol, 2016.PMID 27571159
  7. [7]Deb S, Kwok H, Bertelli M, et al. International guide to prescribing psychotropic medication for the management of problem behaviours in adults with intellectual disabilities World Psychiatry, 2009.PMID 19812757