History Taking · Intermediate · Surgery

Back Pain with Leg Weakness and Bladder Issues

Practise this PLAB 2 history taking station on Cauda Equina Syndrome. 8-minute voice AI simulation with feedback on all 3 marking domains.

Clinical scenario

You are an FY2 doctor in the GP surgery. Mr Nelson Walker, a 58-year-old man, has presented with acute lower back pain, bilateral leg weakness, and altered bladder function. He is concerned about his symptoms. Please rapidly recognise cauda equina syndrome as a surgical emergency and initiate immediate referral.

Background notes: PMH: Nil significant

What this station tests

  • Immediate recognition of cauda equina: bilateral leg symptoms plus bladder dysfunction is the emergency pattern
  • Decisive action without delay: emergency transfer, not outpatient MRI or routine referral
  • Focused rapid history: confirming the diagnosis and surgical fitness, not a comprehensive history
  • Catheterisation as immediate management: relieve retention, monitor output
  • Communicating urgency to the patient: honest about the time-critical nature without causing paralysing panic

How to use your 8 minutes

  • 0-1 min — Introduction: Introduce yourself, confirm identity, open question. 'What's brought you in today?'
  • 1-4 min — Systematic History: Presenting complaint detail (SOCRATES for pain, timeline, severity). Systems review. PMH, medications, allergies.
  • 4-6 min — Context and ICE: Social history (smoking, alcohol, occupation, living situation). Family history. Ideas, Concerns, Expectations.
  • 6-7 min — Summary and Plan: Summarise findings back to patient. Share differential/working diagnosis. Outline investigation and management plan.
  • 7-8 min — Closing: Safety netting with specific red flags. Arrange follow-up. Check for questions.

Consultation approach

The opening

Cauda equina syndrome is a neurosurgical emergency. The candidate must recognise it immediately, act decisively, and arrange emergency transfer without delay. Every hour of delay reduces the chance of neurological recovery. Mr Walker is 58, presenting with acute back pain, bilateral leg weakness, and inability to pass urine since this morning. Open with: 'Mr Walker, these symptoms are very important. I need to ask you some specific questions and then we need to act quickly.'

Core approach

Recognise the cauda equina pattern immediately. Bilateral leg pain (started last night, both legs). Bilateral leg weakness (progressive, cannot stand properly). Urinary retention (cannot pass urine this morning, bladder feels full). This triad, bilateral symptoms plus bladder dysfunction, is cauda equina until proven otherwise.

Ask the remaining confirmatory questions quickly. Saddle anaesthesia: 'Can you feel normally around your bottom and between your legs?' (Reduced sensation confirms the diagnosis.) Bowel function: 'Have you had any difficulty controlling your bowels or any numbness when you wipe?' Back pain: severe, acute onset yesterday, no trauma. No previous back surgery.

Do not spend time on a full history. This is not a standard consultation. The moment you identify bilateral leg symptoms plus bladder dysfunction, the consultation shifts to emergency management. The history is focused on confirming the diagnosis and identifying contraindications to surgery.

Assess quickly: PMH (fit for surgery?), medications (anticoagulants affecting surgical timing?), allergies (for contrast and anaesthesia).

Closing and safety netting

Act immediately. 'Mr Walker, the combination of pain in both legs, weakness, and your inability to pass urine tells me there is likely pressure on the nerves at the base of your spine. This is an emergency that needs urgent investigation and treatment.' Call 999 or arrange emergency transfer to a neurosurgical centre. Emergency MRI spine. Catheterise to relieve urinary retention and monitor output. IV access. Nil by mouth (for potential emergency surgery).

Communicate honestly: 'The best chance of recovery is if we act as quickly as possible. Surgery to relieve the pressure on the nerves is most effective when done within hours.' Involve his wife: she needs to understand the urgency and accompany him.

Do not delay for outpatient MRI, for bloods to return, or for anything else. This patient needs to be in a neurosurgical unit as quickly as possible.

How examiners mark this station

Examiners will focus on the thoroughness and structure of your history taking for cauda equina syndrome. Domain 1 (Data Gathering) carries the most weight: expect marks for systematic coverage of presenting complaint, red flags, PMH, medications, social and family history. Domain 2 (Clinical Management) requires a clear differential, appropriate investigations, and a safe management plan with safety netting. Domain 3 (Interpersonal Skills) is assessed throughout: genuine exploration of ICE, active listening, empathic responses, and clear communication without jargon.

Domain 1: Data Gathering, Technical and Assessment Skills (Primary focus)

Scores well: Cauda equina pattern recognised immediately (bilateral, bladder, saddle). Confirmatory questions asked quickly. Surgical fitness assessed. Focused rather than comprehensive history.

Costs marks: Not recognising the pattern. Taking a standard history. Not checking saddle sensation. Not assessing surgical fitness.

Domain 2: Clinical Management Skills (Primary focus)

Scores well: Emergency transfer arranged immediately. Emergency MRI. Catheterisation. Nil by mouth. IV access. Neurosurgical centre contacted. No delay for outpatient pathway.

Costs marks: Outpatient MRI. Delayed referral. Not catheterising. Not contacting neurosurgery. Any unnecessary delay.

Domain 3: Interpersonal Skills (Adapted to emergency)

Scores well: Communicating urgency clearly without causing panic. Honest about time-critical nature. Involving wife. Brief but genuine empathy within the emergency context.

Costs marks: Not explaining why it is urgent. Causing paralysing panic. Ignoring wife. Being so procedural the patient feels like an object.

Common examiner feedback (and how to fix it)

Did not gather sufficient information to make an adequate assessment of the patient's condition

Fix: Use a consistent framework for every history. After covering the presenting complaint, systematically move through PMH, drug history, social history, family history, and ICE. Keep a mental checklist.

Did not identify the patient's problems and/or did not develop a management plan adequately

Fix: Reserve the final 2 minutes to summarise your findings, share your working diagnosis with the patient, and outline your investigation and management plan including safety netting.

Common mistakes in this station

  1. Taking a full standard history before acting. Cauda equina with bilateral symptoms and urinary retention does not need a comprehensive PMH, social history, and systematic review. The candidate must shift to emergency mode immediately.
  2. Arranging outpatient or next-day MRI. This needs emergency MRI today, ideally within hours. Candidates who arrange 'urgent MRI within 2 weeks' demonstrate failure to recognise the emergency.
  3. Not catheterising. Urinary retention in cauda equina needs immediate relief. Candidates who do not mention catheterisation miss a basic emergency intervention.

Resitting PLAB 2?

If you have previously struggled with history taking stations, focus on building a consistent systematic framework that you apply to every case. Practise structuring your history into clear phases (presenting complaint, systems review, PMH, social, ICE) so that even under pressure, you cover all domains. Many resitters lose marks not on knowledge but on organisation and time management.

Example opening

Good morning/afternoon, my name is Dr [Name], I'm one of the doctors here today. Could I confirm your name and date of birth please? Thank you. So, what's brought you in to see me today?

Frequently asked questions

What is the best way to take a cauda equina syndrome history in PLAB 2?

Cauda equina syndrome is a neurosurgical emergency. The candidate must recognise it immediately, act decisively, and arrange emergency transfer without delay. Every hour of delay reduces the chance of neurological recovery.

Where are marks won and lost in this cauda equina syndrome station?

Examiners reward: Cauda equina pattern recognised immediately (bilateral, bladder, saddle). Confirmatory questions asked quickly. Surgical fitness assessed. Focused rather than comprehensive history. Candidates are penalised for: Not recognising the pattern. Taking a standard history. Not checking saddle sensation. Not assessing surgical fitness.

Where do candidates most often go wrong in this station?

Taking a full standard history before acting. Cauda equina with bilateral symptoms and urinary retention does not need a comprehensive PMH, social history, and systematic review. The candidate must shift to emergency mode immediately.

Can I do well in this station without real-world experience of cauda equina syndrome?

Structure beats experience here. Focus on decisive action without delay: emergency transfer, not outpatient MRI or routine referral. Use the domain breakdown on this page to target your preparation, then practise the station aloud so your structure survives exam pressure.

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