Psych CASC / OSCE · Consultation-liaison psychiatry
Explaining possible normal pressure hydrocephalus and realistic hope — CASC communication station
MRCPsych/FRANZCP-style station: explain possible iNPH in plain language, set realistic expectations about reversibility (Clarfield), outline organised work-up and shunt risks/benefits, address driving without alarmism, and avoid false certainty.
On this page & tools
Target exams
Station brief
Format. Communication station, approximately 7–10 minutes after reading time. You are the psychiatry registrar in a memory/CL clinic. [2][8]
Candidate instructions. Explain possible normal pressure hydrocephalus in accessible language using the gait–thinking–bladder triad; distinguish it from a default Alzheimer label without denigrating prior care; explain that “reversible dementia” means sometimes improvable after careful selection, not guaranteed cure; outline next steps (bloods already done or pending, specialist imaging review, walking assessment before/after CSF removal); discuss shunt benefits (especially walking) and risks; address driving as case-by-case and jurisdiction-guided; check understanding and respond to emotion. [1][2][3][4]
Candidate scenario
Son: “Just book the shunt — online it says this dementia is reversible.” Patient: “If I say no, will I end up a vegetable? Do I hand in my licence today?” Collateral confirms magnetic gait and urgency over years; donepezil has not clearly helped. [2][7]
Marking domains
- Empathy and structure — acknowledges fear and urgency without rushing to surgery.
- Clinical explanation — triad, ventricles, why gait-first matters. [1]
- Reversibility literacy — hope without hype; potentially treatable ≠ always fully reversed. [3]
- Pathway — organised tests before shunt; multidisciplinary. [2][5]
- Risks/benefits — gait more likely to improve; infection, overdrainage, subdural risk. [4]
- Driving and capacity — not automatic same-day ban; decision-specific capacity; local rules. [6]
- Shared plan and check-back.
Model communication points
Suggested phrasing themes
- “This pattern — walking change first, urgency, slowing of thinking, and larger fluid spaces — can fit a condition called normal pressure hydrocephalus, which is different from typical Alzheimer disease though the two can co-exist.” [1][8]
- “Some people improve after a shunt, especially walking, but it is not a guaranteed full reset; we use careful tests to see who is most likely to benefit.” [2][4]
- “Doctors used to talk about ‘reversible dementia’ as if it were common; modern reviews show truly full reversals are uncommon, but treating what we can still matters.” [3]
- “Donepezil is for certain Alzheimer-type dementias; it is not the specific treatment pathway for NPH.” [2]
- “Driving depends on walking safety, thinking, and local licensing rules — we assess rather than confiscate a licence in this room today.” [6]
Common fails
- Promising “100% cure by Christmas”
- Dismissing family as “Dr Google” without education
- Forcing emergency shunt without prognostic discussion
- Automatic permanent licence cancellation language
- Ignoring apathy/depression as part of the syndrome [7]
References
- [1]Relkin N, Marmarou A, Klinge P, et al. Diagnosing idiopathic normal-pressure hydrocephalus Neurosurgery, 2005.PMID 16160425
- [2]Williams MA, Malm J Diagnosis and Treatment of Idiopathic Normal Pressure Hydrocephalus Continuum (Minneap Minn), 2016.PMID 27042909
- [3]Clarfield AM The decreasing prevalence of reversible dementias: an updated meta-analysis Arch Intern Med, 2003.PMID 14557220
- [4]Toma AK, Papadopoulos MC, Stapleton S, et al. Systematic review of the outcome of shunt surgery in idiopathic normal-pressure hydrocephalus Acta Neurochir (Wien), 2013.PMID 23975646
- [5]Kazui H, Miyajima M, Mori E, et al. Lumboperitoneal shunt surgery for idiopathic normal pressure hydrocephalus (SINPHONI-2): an open-label randomised trial Lancet Neurol, 2015.PMID 25934242
- [6]Appelbaum PS, Grisso T Assessing patients' capacities to consent to treatment N Engl J Med, 1988.PMID 3200278
- [7]Kito Y, Kazui H, Kubo Y, et al. Neuropsychiatric symptoms in patients with idiopathic normal pressure hydrocephalus Behav Neurol, 2009.PMID 19996513
- [8]Carswell C Idiopathic normal pressure hydrocephalus: historical context and a contemporary guide Pract Neurol, 2023.PMID 36162853