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MRCEM Part C · OSCE Preparation

OSCE Station Bank 2

10 new structured stations with candidate briefings, examiner instructions and full mark schemes — covering advanced clinical scenarios across all five domains.

0/ 10 completed
10Stations
5Domain types
8Min / station
0/10 completed
📋 History Taking
📋
Headache History
History · 8 min Station 1 of 10
8:00
Station type
History Taking
Time allowed
8 minutes
Pass mark
12 / 20
📄 Candidate Briefing
👁 Examiner Instructions
✅ Mark Scheme

📄 Candidate Instructions

You are the Emergency Medicine doctor. Mr Daniel Okafor, 42 years old, presents with the worst headache of his life, which came on suddenly 3 hours ago while lifting weights at the gym. He describes it as "like being hit over the head with a bat."

Observations: BP 162/94, HR 80, RR 14, SpO₂ 99%, Temp 37.2°C, GCS 15/15.

Please take a focused history from Mr Okafor. You have 8 minutes.

💡 Hints — What to cover ▼
  • Thunderclap headache: Onset — instantaneous vs crescendo. Peak severity within 60 seconds strongly suggests SAH.
  • SOCRATES: Site (global, occipital), character (explosive, worst ever), radiation (neck), associated symptoms (nausea, photophobia, phonophobia, vomiting, LOC).
  • Red flag differentiation: SAH, meningitis (fever, rash, neck stiffness), hypertensive emergency, CVST (progressive, focal deficits), cerebral venous sinus thrombosis, RCVS.
  • Preceding minor headache (sentinel bleed): Any headaches in the past 2–4 weeks?
  • PMH: Polycystic kidney disease (berry aneurysms), connective tissue disorders, previous aneurysm, family history of SAH/aneurysm.
  • Medications: Anticoagulants, OCP, triptans (migraine history?), cocaine use.
  • Social: Smoking, alcohol, recreational drugs.

⚠️ Examiner / Role-player Instructions — Not for Candidate

You are playing Daniel Okafor, a 42-year-old gym instructor. You are visibly distressed and holding your head. The headache started instantaneously during a Valsalva manoeuvre (heavy deadlift) — classic presentation of subarachnoid haemorrhage.

🎭 Patient Script — Answers to give ▼
  • Onset: Instantaneous. "Like someone fired a gun inside my head." Occurred during heavy deadlift — strain/Valsalva.
  • Pain: Global, but predominantly occipital. 10/10 severity. No radiation to face. Neck stiffness developing.
  • Associated: Vomited once at gym. Photophobia — "the lights are killing me." Brief LOC at gym — witnessed by gym partner who called ambulance.
  • Sentinel bleed: If asked — "Actually now you mention it, I had a really bad headache about 3 weeks ago that went away after a few hours. I thought it was dehydration."
  • PMH: Uncle had a brain aneurysm. No personal history. On no regular medications. No anticoagulants. Non-smoker, social drinker.
  • No fever, no rash, no focal neurological symptoms.
🔔 Examiner Cues ▼
  • If candidate has not asked about sentinel headache by 4 minutes: "I did have a headache a few weeks back actually..."
  • If candidate asks to examine: "You may proceed with brief focused neurological assessment."
  • If candidate does not ask about family history: Volunteer — "My uncle had a brain bleed..."
CriterionMarks
Onset & Character
Correctly identifies instantaneous / thunderclap onset2
Quantifies severity — "worst headache of life" elicited1
Site and radiation fully explored (global/occipital)1
Precipitating factor — Valsalva/exertion at gym elicited2
Associated Symptoms
Vomiting, nausea asked and elicited1
Photophobia / phonophobia asked1
Loss of consciousness — asked and established brief LOC1
Neck stiffness / meningism asked1
Red Flag Differentiation
Asks about preceding sentinel headache in past weeks2
Asks about fever / rash (meningitis excluded)1
Asks about focal neurological symptoms (CVST / space-occupying lesion)1
Background & Risk
Family history of aneurysm / SAH / PKD elicited2
Medications including anticoagulants and cocaine asked1
Communication
Introduces self, confirms identity, compassionate approach1
Organised and systematic — does not alarm patient unnecessarily1
Total20
📋
Acute Abdominal Pain History
History · 8 minStation 2 of 10
8:00
Station type
History Taking
Time allowed
8 minutes
Pass mark
12 / 20
📄 Candidate Briefing
👁 Examiner Instructions
✅ Mark Scheme

📄 Candidate Instructions

You are the ED doctor. Miss Lauren Ashby, 26 years old, presents with 18-hour history of right iliac fossa pain, initially periumbilical and migrating. She has been vomiting and is anorexic.

Obs: BP 118/74, HR 102, Temp 38.1°C, RR 18, SpO₂ 98%.

Take a focused history. You have 8 minutes.

💡 Key areas to cover ▼
  • Pain: SOCRATES. Classic appendicitis — periumbilical → RIF migration. Constant, worse on movement/coughing (peritonism).
  • GI: Anorexia (very sensitive for appendicitis), nausea, vomiting, bowel habit (diarrhoea → pelvic appendix/gastroenteritis vs constipation).
  • Urological: Dysuria, haematuria, frequency (exclude UTI/ureteric colic).
  • Gynaecological — CRITICAL: LMP, menstrual regularity, PV discharge/bleeding (ectopic, PID, ovarian torsion), sexual history (sensitively), contraception.
  • Pregnancy test: Must be considered and offered.
  • Alvarado score: Systematically elicit criteria — migration, anorexia, nausea/vomiting, RIF tenderness, rebound tenderness, elevated temp, leukocytosis.

⚠️ Examiner Instructions — Not for Candidate

Lauren has acute appendicitis. She is anxious but cooperative. If candidate asks about gynaecological history sensitively, she will disclose relevant information. Pregnancy test will be negative.

🎭 Patient Script ▼
  • Pain: Started around belly button last night, moved to right lower side by morning. 7/10 severity. Constant. Worse walking to ED. "Even breathing deeply hurts."
  • Anorexia: "I couldn't face food at all — totally lost my appetite." Vomited twice. No diarrhoea — last opened bowels yesterday normally.
  • Urinary: No dysuria, no frequency, urine looks normal.
  • Gynaecological: LMP 3 weeks ago, normal. Regular cycles. Not pregnant (use contraception — pill). No PV discharge or bleeding. Not sexually active currently. No previous pelvic infections.
  • PMH: Nil. No previous surgeries. NKDA. No medications except OCP.
CriterionMarks
Pain History
Elicits periumbilical-to-RIF migration of pain2
Character — constant, worsened by movement/coughing/breathing1
Onset, timing and duration correctly established1
Associated GI Symptoms
Anorexia specifically asked and elicited2
Nausea and vomiting — frequency and timing1
Bowel habit — diarrhoea vs constipation asked1
Gynaecological History
LMP — date, regularity, character elicited2
PV discharge and bleeding asked1
Pregnancy status — test offered / discussed1
Ectopic pregnancy and PID considered as differentials1
Urological & Background
Urinary symptoms excluded — dysuria, haematuria, frequency1
Medications and allergies — OCP documented1
Communication
Gynaecological history obtained sensitively and professionally2
Organised structure, appropriate clinical urgency1
Total20
🩺 Clinical Examination
🩺
Abdominal Examination
Examination · 8 minStation 3 of 10
8:00
Station type
Examination
Time allowed
8 minutes
Pass mark
12 / 20
📄 Candidate Briefing
👁 Examiner Instructions
✅ Mark Scheme

📄 Candidate Instructions

You are asked to perform a focused abdominal examination on this patient. The examiner will tell you the findings as you examine each area.

Please talk through your examination throughout. At the end, present your findings, state the most likely diagnosis, and suggest appropriate investigations and management.

Assume consent has been obtained and appropriate exposure is in place.

🔑 Structured Approach ▼
  • General: Jaundice, pallor, cachexia, distension, surgical scars, spider naevi, gynaecomastia, Dupuytren's, leukonychia, koilonychia.
  • Hands/face: Palmar erythema, asterixis, Dupuytren's, parotid enlargement, scleral icterus, angular stomatitis.
  • Abdomen inspection: Shape, symmetry, visible peristalsis, scars, herniae, caput medusae, stoma.
  • Palpation: Light then deep — 9 regions, tenderness, guarding, rigidity. Specific organ palpation — liver (size, consistency, pulsatile, hepatojugular reflux), spleen (with patient tilted), kidneys (bimanual ballot).
  • Percussion: Liver span, splenic dullness, shifting dullness (ascites), fluid thrill if tense.
  • Auscultation: Bowel sounds (normal/hyperactive/absent), bruits (aortic, renal).
  • Completion: PR examination mentioned, hernia orifices, peripheral oedema, lymphadenopathy, testes.

⚠️ Examiner Instructions — Not for Candidate

Findings represent decompensated alcoholic liver disease (cirrhosis with ascites). Feed findings as candidate examines each area.

📋 Findings to Feed ▼
  • General: Thin, jaundiced male, mildly confused (encephalopathy), distended abdomen.
  • Hands: Leukonychia (white nails), palmar erythema, Dupuytren's contracture right hand, asterixis (flapping tremor) on outstretched hands.
  • Face: Scleral jaundice. Parotid enlargement bilateral. Spider naevi x3 on chest.
  • Abdomen: Distended and dull to percussion centrally — shifting dullness present. Caput medusae visible. Liver — 3 cm below costal margin, firm, non-tender. Spleen — just palpable tip. No pulsatile mass.
  • Bowel sounds: Present and normal.
  • Legs: Bilateral pitting oedema to mid-shin.
  • Diagnosis: Decompensated alcoholic liver cirrhosis with ascites, portal hypertension, and hepatic encephalopathy.
CriterionMarks
Peripheral Signs
Hands — leukonychia, palmar erythema, Dupuytren's, asterixis identified2
Face — scleral jaundice, parotid enlargement, spider naevi noted2
Abdominal Examination
Inspection — correctly identifies distension and caput medusae2
Systematic light and deep palpation of all 9 regions1
Liver — size quantified, consistency described (firm)2
Spleen — correctly palpated with patient tilted1
Ascites — shifting dullness demonstrated correctly2
Auscultation — bowel sounds and bruits assessed1
Presentation
Correct diagnosis — decompensated cirrhosis with ascites2
Mentions completing exam — PR, herniae, lymphadenopathy1
Appropriate investigations — LFTs, clotting, U&E, ascitic tap, USS1
Identifies encephalopathy — asterixis, confusion1
Total20
🩺
Neurological Examination — Upper Limb
Examination · 8 minStation 4 of 10
8:00
Station type
Examination
Time allowed
8 minutes
Pass mark
12 / 20
📄 Candidate Briefing
👁 Examiner Instructions
✅ Mark Scheme

📄 Candidate Instructions

A 62-year-old woman presents with right arm weakness and clumsiness which came on suddenly this morning while having breakfast. It lasted for 2 hours and has now partially resolved.

Please perform a focused upper limb neurological examination, talk through your findings, and present a differential diagnosis with immediate management plan.

🔑 Structured Approach ▼
  • Inspection: Wasting (UMN vs LMN), fasciculations, posture, pronator drift.
  • Tone: Passive movement — increased (UMN/spasticity) vs decreased (LMN/cerebellar).
  • Power: MRC grading 0–5 each group — shoulder abduction (C5), elbow flexion (C5/6), elbow extension (C7), wrist extension (C7), finger extension (C7), grip (C8/T1), finger abduction (T1).
  • Reflexes: Biceps (C5/6), brachioradialis (C6), triceps (C7) — grade 0 to 4+. Hoffman's reflex (UMN).
  • Coordination: Finger-nose test (ataxia — cerebellar vs sensory). Dysdiadochokinesis.
  • Sensation: Light touch, pinprick — dermatomal pattern. Proprioception, vibration at wrist/thumb.
  • Interpretation: UMN signs (increased tone, brisk reflexes, pronator drift, no wasting) → contralateral cortex/internal capsule lesion → TIA/stroke pattern.

⚠️ Examiner Instructions — Not for Candidate

Findings represent a resolving right-sided TIA — subtle UMN signs persisting. Feed findings as candidate examines.

📋 Findings to Feed ▼
  • Inspection: No wasting or fasciculations. Subtle pronator drift right arm (positive).
  • Tone: Mildly increased right arm — "catch" on passive extension.
  • Power: Right grip 4/5. Right finger extension 4/5. Right shoulder abduction 5/5. Left all 5/5.
  • Reflexes: Brisk right biceps and brachioradialis (3+). Left normal (2+). Hoffman's positive on right.
  • Coordination: Finger-nose — slight dysmetria right. Left normal.
  • Sensation: Mildly reduced light touch right hand and forearm. Proprioception intact.
  • Pattern: Right-sided UMN signs → left hemisphere/corticospinal tract lesion. Context: resolving after 2 hours → TIA. ABCD² score should be calculated.
CriterionMarks
Inspection
Correctly inspects for wasting and fasciculations1
Tests for pronator drift — correctly identifies right-sided drift2
Tone
Assesses tone bilaterally — correctly notes increased right-sided tone1
Power
Tests all major muscle groups — uses MRC grading 0–52
Identifies right-sided weakness (grip and finger extension 4/5)1
Reflexes
Tests biceps, brachioradialis, triceps bilaterally1
Correctly identifies brisk right-sided reflexes (UMN pattern)1
Tests Hoffman's reflex — correctly notes positive on right1
Coordination and Sensation
Finger-nose test performed bilaterally1
Sensation — light touch and proprioception assessed1
Presentation
Correctly identifies right UMN pattern — left hemisphere lesion2
Correct diagnosis — TIA. Mentions ABCD² score2
Immediate management — aspirin 300mg, urgent TIA clinic / brain imaging, ABCD² ≥4 → same-day specialist review1
Total20
🔧 Practical Procedures
🔧
DC Cardioversion
Procedure · 8 minStation 5 of 10
8:00
Station type
Procedure
Time allowed
8 minutes
Pass mark
12 / 20
📄 Candidate Briefing
👁 Examiner Instructions
✅ Mark Scheme

📄 Candidate Instructions

A 58-year-old woman presents to the resus bay with rapid AF with a ventricular rate of 160 bpm. She is haemodynamically compromised: BP 82/50, reduced consciousness (GCS 12), and severe chest pain. She has been in AF for less than 48 hours.

Please demonstrate emergency DC cardioversion on this manikin. Talk through each step. The team is assembled and anaesthetics are present for sedation.

📝 Equipment & Steps ▼
  • Indications: Haemodynamic compromise (hypotension, reduced GCS, ischaemic chest pain, acute HF).
  • Equipment: Defibrillator (synchronised mode), self-adhesive pads or paddles with gel, anaesthetic support for sedation/anaesthesia, resuscitation equipment, IV access, monitoring (ECG, SpO₂, BP), oxygen.
  • Key steps: Confirm indication, informed consent if possible (or emergency), anaesthesia/sedation, correct pad placement (anterolateral or anteroposterior), SYNCHRONISE MODE (critical — must see sync markers on R waves), energy selection (120–200J biphasic for AF), stand clear, check all clear, deliver shock.
  • Post-shock: Reassess rhythm and haemodynamics. If unsuccessful — increase energy. If successful — anticoagulate.
  • Do NOT cardiovert if: AF >48 hours without adequate anticoagulation (thrombus risk) — exception: haemodynamic compromise (cardiovert and anticoagulate).

⚠️ Examiner Instructions — Not for Candidate

The critical teaching point is synchronised mode. If candidate attempts to cardiovert in defibrillation (unsynchronised) mode, stop them and ask why synchronisation matters.

🔔 Prompts ▼
  • If candidate does not mention sedation: "The patient is conscious — how will you manage this?"
  • If candidate does not switch to synchronised mode: "What mode have you selected on the defibrillator?"
  • After first shock: "Rhythm shows sinus rhythm with rate of 78. BP is now 106/72. What do you do next?"
  • If candidate unsure of energy: "What energy would you start at?"
CriterionMarks
Assessment & Indication
Correctly identifies haemodynamic compromise as indication for emergency cardioversion2
Recognises duration <48 hours — addresses anticoagulation implications1
Preparation
Calls for anaesthetic support — safe sedation before procedure2
IV access confirmed, monitoring applied, resus equipment checked1
Correct pad placement stated — anterolateral or anteroposterior1
Procedure
Selects SYNCHRONISED mode — confirms R-wave markers visible on ECG3
Correct energy selection — 120–200J biphasic1
Clear warning — "Stand clear" — checks all staff clear before shock2
Delivers shock correctly1
Post-Procedure
Reassesses rhythm and haemodynamics immediately1
Anticoagulation plan stated post-cardioversion1
Explains why synchronisation critical — avoids R-on-T VF1
Documents, clear communication with team throughout1
Total20
🔧
Intraosseous Access (EZ-IO)
Procedure · 8 minStation 6 of 10
8:00
Station type
Procedure
Time allowed
8 minutes
Pass mark
12 / 20
📄 Candidate Briefing
👁 Examiner Instructions
✅ Mark Scheme

📄 Candidate Instructions

A 45-year-old man is in cardiac arrest following anaphylaxis. The resuscitation team is performing CPR. Three peripheral IV attempts have been unsuccessful. You are asked to establish intraosseous access using the EZ-IO device on this manikin.

Talk through each step, state your chosen site, and explain how you will confirm correct placement. State what drugs you can administer via this route.

📝 Key Points ▼
  • Indications: Any patient requiring immediate vascular access when IV is unavailable — cardiac arrest, major haemorrhage, anaphylaxis, status epilepticus.
  • Sites (adults): Proximal tibia (2–3 cm below tibial tuberosity, medial flat surface) — preferred. Proximal humerus (greater tubercle — high flow, good for resus). Distal tibia. Sternum (sternal IO — specialist).
  • Needle selection: EZ-IO — 25 mm (3–39 kg), 45 mm (>40 kg standard, obese patients), 45 mm humeral head.
  • Technique: Position, identify landmark, clean, stabilise limb, 90° angle perpendicular to bone, drill until sudden decrease in resistance, remove stylet, confirm with aspiration (blood/marrow), flush with 10 ml saline (IO space not self-priming), attach extension set.
  • Drugs via IO: All ACLS/APLS drugs — adrenaline, amiodarone, atropine, adenosine, fluid, blood, glucose, phenytoin. NOT bretylium or diazepam (painful). Lidocaine 2% 40mg IO before flush if conscious.
  • Complications: Extravasation (compartment syndrome), osteomyelitis, fracture, fat embolism (theoretical), needle displacement.
  • Maximum dwell time: 24 hours (24 hours AHA), 48 hours ERC — remove as soon as IV established.

⚠️ Examiner Instructions — Not for Candidate

Assess whether candidate chooses an appropriate site, uses correct needle length, confirms placement properly, and knows what can be administered IO. If candidate goes to tibia: appropriate. Ask about humeral site as alternative.

CriterionMarks
Indication & Site Selection
States indication — failed IV access in time-critical situation1
Correct site — proximal tibia or proximal humerus with accurate landmark2
Correct needle length selection for patient size1
Procedure
Limb stabilised, site cleaned aseptically1
Perpendicular 90° angle to bone — does not angle1
Drills until sudden decrease in resistance — does not over-advance2
Removes stylet, attempts aspiration to confirm marrow return1
Flushes with 10 mL 0.9% saline — confirms free flow without extravasation2
Knowledge
States drugs that can be given IO — includes adrenaline, amiodarone, fluids2
Mentions lidocaine flush if patient conscious (prior to saline flush)1
Complications listed — extravasation/compartment syndrome, osteomyelitis1
States IO removed as soon as IV access established (24-48 hour max)1
Safe, systematic, communicates with team throughout1
Total20
💬 Communication
💬
Mental Capacity Assessment — Refusing Treatment
Communication · 8 minStation 7 of 10
8:00
Station type
Communication
Time allowed
8 minutes
Framework
MCA 2005
📄 Candidate Briefing
👁 Examiner Instructions
✅ Mark Scheme

📄 Candidate Instructions

Mr Graham Holt, 55 years old, presents to ED with a deep laceration to his arm following a fall. The wound requires suturing under local anaesthetic — a routine, low-risk procedure. He is refusing all treatment and wants to go home.

He has a known history of paranoid schizophrenia, currently on depot antipsychotic. He is alert, speaking coherently and does not appear acutely psychotic.

Please assess Mr Holt's mental capacity to refuse treatment and manage this situation appropriately. You have 8 minutes.

💡 MCA 2005 Framework ▼
  • Presumption of capacity: Begin with the assumption of capacity — do not assume lack of capacity due to mental illness diagnosis alone.
  • Four-stage test (assess for the specific decision):
    1. Can they understand the information relevant to the decision?
    2. Can they retain the information long enough to make the decision?
    3. Can they weigh up and use the information?
    4. Can they communicate their decision (by any means)?
  • If capacitous: Respect the refusal even if unwise. Document thoroughly. Ensure patient is informed of consequences. Offer to review decision.
  • If lacking capacity: Act in best interests (MCA 2005). Consider less restrictive options. Document. Consider IMCA/next of kin.
  • Never: Assume incapacity from diagnosis. Treat against capacitous refusal (unlawful). Be coercive.

⚠️ Examiner / Role-player Instructions — Not for Candidate

You are Graham Holt. You have capacity in this scenario. You understand the risks of not having your wound sutured but distrust the hospital — "they put things in the needles." Remain firm in refusal unless candidate is exceptionally empathic and addresses your fears sensitively — in which case you can become ambivalent but still cautious.

🎭 Role-player Script ▼
  • Opening: "I just want to go home. I don't want any injections or treatment. I know my rights."
  • When asked to explain understanding: "I know I've got a cut. I know it might get infected if you don't stitch it. But I don't trust hospitals."
  • When asked about weighing risks: "I've thought about it. I'd rather take my chances than be here."
  • If candidate respects decision and offers compromise: May accept wound closure strips instead of sutures — "I suppose if it's just a dressing..."
  • Clear cognitive function — no disorganised thinking, oriented, coherent.
CriterionMarks
Approach & Presumption
States presumption of capacity — does not assume incapacity from diagnosis2
Approaches patient with respect, introduces self, creates rapport1
Capacity Assessment — 4-Stage Test
Tests understanding — asks patient to explain information in own words2
Tests retention — checks patient can recall key points after brief delay1
Tests weighing — explores reasoning, asks patient to articulate balance of risks2
Tests communication — patient can express decision clearly1
Outcome & Documentation
Correctly determines patient has capacity in this scenario2
Respects capacitous refusal — does not coerce or threaten2
Informs patient of consequences of refusal clearly and without pressure1
Offers compromise / alternative (e.g., steri-strips, wound closure)1
States will document decision and patient's reasoning thoroughly1
Offers return to ED if patient changes mind — leaves door open1
Non-judgemental, empathic throughout despite patient's suspicion1
Total20
💬
Clinical Handover — Sick Trauma Patient
Communication · 8 minStation 8 of 10
8:00
Station type
Communication
Time allowed
8 minutes
Framework
SBAR / ATMIST
📄 Candidate Briefing
👁 Examiner Instructions
✅ Mark Scheme

📄 Candidate Instructions

You have been managing a trauma patient in resus for the last 20 minutes. The trauma surgery registrar has now arrived and you need to give a structured handover.

Patient summary: Mr Tariq Hussain, 38, motorcyclist. High-speed RTC. GCS 14 on scene, now 12/15 (E3V4M5). Tachycardic (HR 128), BP 88/60. Two large-bore IV cannulae. 1L crystalloid given. CXR — left haemothorax. Pelvis film — left pubic ramus fracture. Abdomen soft but tender. FAST scan — free fluid in Morrison's pouch. Blood products activated. No known allergies. Lives alone.

Please give a structured handover to the surgical registrar using an appropriate framework. You have 8 minutes.

💡 ATMIST / SBAR Frameworks ▼
  • ATMIST (Trauma handover): Age/Sex — Time of injury — Mechanism — Injuries found/suspected — Signs (Vitals) — Treatment given.
  • SBAR: Situation — Background — Assessment — Recommendation.
  • Key elements: Clear patient ID, mechanism, current GCS and haemodynamic status, injuries confirmed and suspected, interventions to date, blood products status, immediate needs, your recommendation.
  • Red flags to highlight: Haemodynamic instability, falling GCS, haemothorax, positive FAST, pelvic fracture — all point to major haemorrhage protocol and likely need for operative intervention.

⚠️ Examiner / Surgical Registrar Role

You are the surgical registrar. You are focused and efficient. Ask at least 2 questions: "What's his current GCS trend?" and "Has orthopaedics been called for the pelvis?" Assess whether the candidate gives a structured, complete, efficient handover without being prompted.

CriterionMarks
Structure & Framework
Uses named framework — SBAR or ATMIST explicitly or implicitly structured2
Clear patient ID — name, age, mechanism of injury1
Clinical Content
Current GCS stated and trend described (14 → 12 — deteriorating)2
Haemodynamic status — BP, HR, shock recognised and stated2
Injuries — haemothorax, pelvic fracture, positive FAST all mentioned3
Interventions to date — IV access, fluids, imaging results summarised2
Blood products — activation of major haemorrhage protocol mentioned1
Recommendation & Teamwork
Clear recommendation — states patient needs urgent surgical review and likely operative intervention2
Mentions orthopaedics for pelvis, ITU awareness1
Confident, concise delivery — does not waffle or omit critical information1
Responds appropriately to surgical registrar's questions1
Total20
📊 Data Interpretation
📊
Chest X-Ray Interpretation
Data · 8 minStation 9 of 10
8:00
Station type
Data Interpretation
Time allowed
8 minutes
Pass mark
12 / 20
📄 Candidate Briefing
👁 Examiner Instructions
✅ Mark Scheme

📄 Candidate Instructions

An 80-year-old man with known COPD presents with sudden onset breathlessness and sharp right-sided chest pain following a coughing fit. He is on home oxygen.

Obs: RR 28, SpO₂ 82% on 2L O₂, HR 118, BP 134/88.

The examiner will describe the CXR findings. Please interpret them systematically, state your diagnosis and immediate management. You will then be asked two follow-up questions.

💡 CXR Systematic Approach ▼
  • RIPE: Rotation — Inspiration — Projection — Exposure.
  • Airway: Trachea midline? Carina angle?
  • Breathing: Lung fields — pneumothorax (absent lung markings, visceral pleural line), effusion (blunting of costophrenic angle, meniscus), consolidation, pulmonary oedema (Kerley B, bat wings, upper lobe diversion).
  • Cardiac: Cardiothoracic ratio (normal <0.5 on PA), heart borders, mediastinum width.
  • Diaphragm: Right higher than left. Costophrenic angles sharp. Free air under diaphragm.
  • Everything else: Bones (rib fractures), soft tissues, tubes and lines, foreign bodies.

⚠️ Examiner Instructions — Not for Candidate

Read the following CXR description aloud, then ask the two follow-up questions.

📋 CXR Description to Read ▼

"The film is adequately exposed and rotated. There is a complete absence of lung markings on the right side. A clear visceral pleural line is visible parallel to the right chest wall. The right hemithorax appears hyperinflated and the trachea is deviated to the left. The left lung field shows hyperinflation consistent with COPD. Cardiac size is normal. No rib fractures. No effusion on left."

Follow-up Q1: "What is your immediate management?"

Expected: This is a tension pneumothorax clinically — DO NOT wait for imaging before treatment if haemodynamically compromised. Immediate needle thoracostomy — 2nd ICS, mid-clavicular line (or 4th/5th ICS anterior axillary line per latest ATLS) — then definitive chest drain.

Follow-up Q2: "The patient deteriorates — BP drops to 60/40 and he loses consciousness. What do you do?"

Expected: Immediate needle decompression without waiting — this is now life-threatening tension pneumothorax. Call for help, commence ABCDE resuscitation simultaneously. If needle decompression fails, consider finger thoracostomy.

CriterionMarks
Systematic Interpretation
States RIPE or equivalent systematic approach before describing findings1
Correctly identifies absent lung markings on right2
Identifies visceral pleural line on right1
Notes tracheal deviation to the left (mediastinal shift)2
Identifies background COPD — bilateral hyperinflation1
Diagnosis & Urgency
Correct diagnosis — large right pneumothorax / tension pneumothorax2
Recognises this is life-threatening — tension pattern with mediastinal shift2
Management
Immediate needle decompression — correct site (2nd ICS MCL or 4th/5th AAL)2
States not to await imaging if clinical diagnosis of tension pneumothorax2
Definitive management — chest drain insertion planned1
Appropriate response to deterioration — immediate decompression without hesitation1
Total20
📊
Biochemical Results — DKA Interpretation
Data · 8 minStation 10 of 10
8:00
Station type
Data Interpretation
Time allowed
8 minutes
Pass mark
12 / 20
📄 Candidate Briefing
👁 Examiner Instructions
✅ Mark Scheme

📄 Candidate Instructions

A 22-year-old woman with Type 1 diabetes presents confused and vomiting. She has not taken her insulin for 2 days after her insulin pen was lost.

Obs: GCS 13/15, RR 28 (deep Kussmaul breathing), HR 116, BP 96/62, Temp 37.8°C. Capillary glucose 28 mmol/L.

The examiner will read you her blood results. Please interpret them systematically, confirm the diagnosis and outline your immediate management using the DKA protocol.

💡 DKA Diagnostic Criteria & Management ▼
  • DKA Diagnosis (JBDS criteria): Ketonaemia ≥3 mmol/L (or ketonuria 2+), blood glucose >11 or known T1DM, bicarbonate <15 mmol/L and/or pH <7.3.
  • Severity: Mild — pH 7.25–7.3, HCO₃ 15–18. Moderate — pH 7.0–7.25, HCO₃ 10–15. Severe — pH <7.0, HCO₃ <10.
  • Fixed rate IV insulin (FRIII): 0.1 unit/kg/hr. Do NOT give a bolus.
  • IV fluids: 0.9% NaCl — 1L over 1hr, then 1L/2hr x2, then 1L/4hr x2, then reassess. Add dextrose when glucose <14 mmol/L.
  • Potassium: Check K⁺ before starting insulin. If K⁺ <3.5 — replace before insulin. Add 40 mmol KCl per litre if K⁺ 3.5–5.5. Omit if K⁺ >5.5.
  • Resolution criteria: pH >7.3, HCO₃ >18, ketones <0.3 mmol/L. Then transition to SC insulin. Give SC insulin 30–60 min before stopping IV.
  • Complications to monitor: Cerebral oedema (especially children), hypokalaemia, hypoglycaemia, aspiration (vomiting), thromboembolism.

⚠️ Examiner Instructions — Not for Candidate

Read the blood results aloud, then ask the follow-up questions. Key assessment point: potassium management before insulin initiation.

📋 Results to Read Aloud ▼

"pH 7.18, HCO₃ 9 mmol/L, PaCO₂ 2.8 kPa (compensatory hyperventilation), Glucose 28 mmol/L, Ketones 5.4 mmol/L, Na 132 mmol/L, K⁺ 3.2 mmol/L, Cl 98, Urea 11.2, Creatinine 132. WBC 16.4. CRP 42. Urine dipstick — ketones 3+, glucose 3+, no nitrites."

Follow-up Q1: "You are about to start the FRIII insulin infusion. What do you need to check first?"

Expected: K⁺ — must be ≥3.5 before starting insulin. This patient's K⁺ is 3.2 — replace first. IV KCl supplementation before commencing insulin infusion.

Follow-up Q2: "When can you stop the insulin infusion and what precautions must you take?"

Expected: Resolution criteria met (pH >7.3, HCO₃ >18, ketones <0.3). Patient must be eating and drinking. Give SC insulin 30–60 minutes before stopping IV insulin to prevent rebound ketosis.

CriterionMarks
Interpretation
Identifies metabolic acidosis — pH 7.18, HCO₃ 91
Identifies compensatory respiratory alkalosis — low PaCO₂ 2.8, Kussmaul breathing1
Notes hyperglycaemia 28 and ketonaemia 5.4 — confirms DKA triad2
Correctly classifies severity — severe DKA (pH <7.0 threshold missed — moderate: pH 7.18)1
Identifies low sodium 132 — likely pseudohyponatraemia. Corrected Na calculated1
Identifies low potassium 3.2 — recognises critical significance2
Immediate Management
IV fluid resuscitation — 0.9% NaCl, correct rate and sequence stated2
FRIII insulin — 0.1 unit/kg/hr. States no bolus dose2
Potassium replacement BEFORE starting insulin — critical safety point2
Dextrose added when glucose <14 mmol/L1
Resolution & Monitoring
States resolution criteria and transition to SC insulin correctly2
30–60 min overlap between IV and SC insulin before stopping infusion1
Complications monitored — hypokalaemia, hypoglycaemia, cerebral oedema1
Total20
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