A 31-year-old primigravida with severe preeclampsia is undergoing emergency Caesarean section under spinal anaesthesia. Baseline: • BP 175/110 mmHg • HR 95/min Five minutes after spinal injection: • BP 80/40 mmHg • HR 120/min • Fetal heart rate falls from 140 bpm to 85 bpm What is the MOST likely explanation for the fetal bradycardia?

A 68-year-old man undergoes cemented hemiarthroplasty for fractured neck of femur. Five minutes after cement insertion: • BP 130/80 → 65/35 mmHg • SpO₂ 99% → 82% • ETCO₂ 34 → 14 mmHg The surgeon asks: "Could this be a pulmonary embolism?" What feature MOST strongly supports Bone Cement Implantation Syndrome rather than thrombotic pulmonary embolism?

A 4-year-old child undergoes adenotonsillectomy. In recovery: • HR 165/min • BP 75/40 mmHg • SpO₂ 98% • Repeated swallowing noted • Child increasingly restless A junior doctor attributes the agitation to emergence delirium. What is the MOST likely diagnosis?

A patient undergoes posterior fossa craniotomy in the sitting position. Suddenly: • ETCO₂ falls from 35 to 18 mmHg • SpO₂ falls to 90% • BP falls to 80/40 mmHg The surgeon reports: "I just entered a venous sinus." What is the MOST appropriate immediate action?

A 70-year-old patient undergoes robotic radical prostatectomy. After 6 hours in steep Trendelenburg: • Face swollen • Tongue swollen • Conjunctival oedema present The surgeon says: "The operation is finished." What is the MOST important question before extubation?

A 58-year-old woman undergoes laparoscopic hemicolectomy. Two hours after pneumoperitoneum: • ETCO₂ gradually rises from 36 to 55 mmHg • Peak airway pressure rises slightly • SpO₂ remains 99% • HR 82/min • Temperature 36.7°C The trainee becomes concerned about malignant hyperthermia. What is the MOST likely explanation?

A 34-year-old woman in labour develops the following CTG: • Baseline 170 bpm • Variability 3 bpm • Recurrent late decelerations BP is 75/40 mmHg following epidural top-up. What is the MOST likely primary cause of the CTG abnormality?

A 5-year-old child undergoes emergency bronchoscopy for suspected peanut aspiration. During bronchoscopy: • HR falls from 120 to 55/min • SpO₂ falls from 98% to 78% What is the MOST appropriate immediate action?

A patient undergoing scoliosis correction develops: • Sudden loss of MEP signals • SSEPs remain normal • MAP 48 mmHg What is the MOST likely explanation?

A 72-year-old man undergoes TURP under spinal anaesthesia. After 90 minutes: • Restless • Confused • HR 52/min • BP 180/95 mmHg Serum sodium returns: 118 mmol/L What is the MOST dangerous immediate complication?

A patient undergoing VATS lobectomy is on one-lung ventilation. Suddenly: • SpO₂ falls to 84% • FiO₂ already 100% • DLT position confirmed bronchoscopically What is the BEST next step?

A 67-year-old diabetic patient is undergoing carotid endarterectomy under regional anaesthesia. During carotid clamping he suddenly says: "I cannot move my right arm." What is the MOST important interpretation?

A patient undergoing thyroidectomy is extubated. Ten minutes later: • Increasing stridor • Neck swelling • Anxiety • Oxygen saturation falling What is the MOST dangerous mistake?

A patient receives an interscalene block before shoulder arthroscopy. After surgery: • Ptosis • Miosis • Hoarse voice but normal oxygenation. What is the MOST likely explanation?

A septic ICU patient has: • Lactate 8 mmol/L • ScvO₂ 44% • Hb 11 g/dL • Cardiac Index 1.6 L/min/m² Which intervention is MOST likely to improve oxygen delivery?

A 67-year-old woman is undergoing total knee replacement under spinal anaesthesia with sedation. Thirty minutes after tourniquet inflation: • BP 125/75 mmHg • HR 72/min Immediately after tourniquet release: • BP 85/45 mmHg • ETCO₂ rises from 34 to 42 mmHg • HR 105/min What is the MOST likely explanation?

A 5-year-old child undergoes adenotonsillectomy. In recovery: • Stridor • Suprasternal recession • SpO₂ 92% • Good air movement What is the MOST likely diagnosis?

A 72-year-old man undergoing robotic prostatectomy develops: • Peak pressure 40 cmH₂O • Plateau pressure 38 cmH₂O Which interpretation is MOST accurate?

A woman with severe postpartum haemorrhage has: • Blood loss 2500 mL • BP 75/40 mmHg • HR 140/min Despite fluids, hypotension persists. Laboratory values: • Fibrinogen 0.9 g/L What is the MOST concerning finding?

A patient undergoes clipping of an anterior communicating artery aneurysm. During temporary clipping: • MEP amplitude decreases by 70% • SSEPs unchanged What is the MOST likely interpretation?

A 62-year-old diabetic patient undergoes carotid endarterectomy. Immediately after unclamping: • BP 220/120 mmHg • HR 105/min What complication is the surgeon most concerned about?

A patient undergoing thyroidectomy suddenly develops: • HR 38/min • BP 70/40 mmHg during surgical manipulation. The surgeon is dissecting near the carotid sheath. What is the MOST likely mechanism?

A patient undergoing VATS develops: • ETCO₂ 18 mmHg • BP 70/35 mmHg • SpO₂ 85% Immediately after central venous catheter insertion. What is the MOST likely diagnosis? • Vagal activation • Bradycardia • Hypotension Usually resolves when the stimulus is removed. Prometric Pearl Neck surgery can trigger profound vagal reflexes.

A 3-year-old child with Tetralogy of Fallot develops: • SpO₂ 50% • Severe cyanosis • Tachypnoea during induction. Which intervention is MOST likely to improve oxygenation?

A patient undergoes endoscopic sinus surgery. The surgeon reports progressively worsening visibility despite minimal bleeding earlier. ABG: • pH 7.31 • PaCO₂ 58 mmHg What is the MOST likely explanation?

A 64-year-old man is undergoing laparoscopic right hemicolectomy. During trocar insertion, the capnograph suddenly changes: • ETCO₂ falls from 36 mmHg to 12 mmHg • BP falls from 130/80 to 70/40 mmHg • SpO₂ falls to 86% The surgeon says: "I just insufflated the abdomen." What is the MOST likely diagnosis?

A 30-year-old woman in labour has the following CTG: • Baseline 145 bpm • Variability 10 bpm • Recurrent variable decelerations The obstetrician asks whether this suggests placental insufficiency. What is the MOST likely explanation?

A 75-year-old man undergoes hip fracture fixation under spinal anaesthesia. Thirty minutes later: • BP 70/35 mmHg • HR 42/min The block level is T3. Which physiological mechanism BEST explains the bradycardia?

A patient undergoing VATS lobectomy develops: • SpO₂ 85% • FiO₂ 100% • DLT position confirmed • CPAP to operative lung ineffective What is the MOST appropriate next step?

A 66-year-old diabetic patient undergoes carotid endarterectomy under regional anaesthesia. During clamping: • Speech becomes slurred • Contralateral arm weakness develops BP is 105/60 mmHg. What is the BEST immediate action?

A 4-year-old child undergoes adenotonsillectomy. Ten minutes after extubation: • Severe inspiratory effort • No air movement • SpO₂ 68% Jaw thrust and CPAP fail. What is the BEST next step?

A patient undergoing pituitary surgery develops: • Urine output 1500 mL over 2 hours • Serum sodium rises from 139 to 151 mmol/L What is the MOST likely diagnosis?

A patient undergoes thyroidectomy. Twenty minutes after extubation: • Stridor • Neck swelling • Oxygen saturation 88% What is the MOST dangerous error?

A septic ICU patient has: • Lactate 9 mmol/L • ScvO₂ 43% • Cardiac Index 1.5 L/min/m² • Hb 11 g/dL What is the MOST likely physiological problem?

A patient undergoes shoulder arthroscopy under general anaesthesia with an interscalene block. Postoperatively: • Ptosis • Miosis • Hoarseness SpO₂ 98% What is the MOST likely interpretation?

A 29-year-old woman with severe postpartum haemorrhage has received: • 4 units PRBC • 4 units FFP • Uterotonics • Tranexamic acid Current observations: • BP 85/45 mmHg • HR 138/min Laboratory results: • Hb 8.2 g/dL • Platelets 42 × 10⁹/L • Fibrinogen 0.8 g/L What is the MOST important blood product to administer next?

A 7-year-old child undergoes emergency appendicectomy. During induction: • Difficult mask ventilation • Increasing ETCO₂ • Progressive desaturation Laryngoscopy reveals: • Large tonsils • Copious secretions • Poor view What is the MOST important mistake to avoid?

A patient undergoing clipping of a ruptured aneurysm develops: • MAP 55 mmHg • MEP amplitude reduced by 80% • SSEPs unchanged What is the MOST appropriate immediate intervention?

A patient undergoing robotic cystectomy has been in steep Trendelenburg for 7 hours. At the end of surgery: • Facial oedema • Tongue swelling • Conjunctival oedema What is the BEST assessment before extubation?

A patient undergoing TURBT develops: • Sudden violent adductor contraction • Bladder wall perforation The surgeon asks how this might have been prevented. What is the BEST answer?

A patient undergoing one-lung ventilation has: • FiO₂ 100% • SpO₂ 86% • DLT correctly positioned ABG: • PaO₂ 55 mmHg • PaCO₂ 38 mmHg What physiological process is MOST responsible for maintaining oxygenation during OLV?

A woman in labour develops: • Sudden hypoxaemia • Hypotension • Cardiac arrest immediately after delivery. ROSC is achieved. Laboratory tests later reveal: • DIC • Low fibrinogen What is the MOST likely diagnosis?

A 4-year-old child weighing 20 kg has: • Estimated blood volume 1400 mL During surgery, blood loss reaches 350 mL. The child remains normotensive. What is the MOST important lesson?

A patient receives an interscalene block. Thirty minutes later: • Mild dyspnoea • Reduced diaphragmatic movement on ultrasound • SpO₂ 98% What is the MOST likely explanation?

A patient undergoing posterior fossa surgery develops: • ETCO₂ 14 mmHg • BP 65/35 mmHg • SpO₂ 88% The surgeon reports opening a large venous channel. What diagnosis BEST integrates all the findings?

A 68-year-old man is undergoing endovascular abdominal aortic aneurysm repair (EVAR). Thirty minutes after deployment of the stent graft: • Urine output falls sharply • BP remains 130/75 mmHg • HR 78/min The surgeon reports difficulty cannulating the renal arteries during the procedure. What is the MOST likely explanation?

A 32-year-old woman undergoes emergency Caesarean section under spinal anaesthesia. Five minutes later: • BP 65/35 mmHg • HR 45/min • Difficulty breathing • Unable to move upper limbs What is the MOST likely diagnosis?

A patient undergoing VATS lobectomy develops: • SpO₂ 82% • FiO₂ 100% • DLT correctly positioned The surgeon says: "I can pause if needed." What is the MOST effective immediate manoeuvre?

A 70-year-old woman undergoes thyroidectomy. Twenty minutes after extubation: • Stridor • SpO₂ 90% • Neck swelling • Anxiety The surgeon is still in the recovery area. What is the MOST appropriate immediate action?

A 6-year-old child undergoes tonsillectomy. In recovery: • HR 160/min • BP 75/40 mmHg • Repeated swallowing • Pallor The surgical site appears dry. What is the MOST likely diagnosis?

A patient undergoing clipping of an intracranial aneurysm develops: • BP 90/50 mmHg • MEPs disappear • SSEPs unchanged What is the MOST important first intervention?

A patient undergoing TURP develops: • Restlessness • Confusion • Sodium 116 mmol/L What is the MOST dangerous neurological complication?

A patient with severe COPD undergoes laparoscopic colectomy. During pneumoperitoneum: • ETCO₂ rises from 38 to 58 mmHg • HR stable • Temperature normal What is the MOST appropriate management?

A patient receives an adductor canal block before TKR. Postoperatively: • Excellent analgesia • Able to perform straight-leg raise What is the BEST explanation?

A patient undergoing posterior fossa surgery develops: • ETCO₂ falls from 35 to 15 mmHg • BP 70/40 mmHg • SpO₂ 88% TEE demonstrates air in the right atrium. What is the MOST important immediate anaesthetic change?

A 65-year-old man is undergoing total hip replacement under spinal anaesthesia. Thirty minutes after cement insertion: • BP 65/35 mmHg • SpO₂ 82% • ETCO₂ 15 mmHg The surgeon asks whether he should continue with wound closure. What is the MOST important physiological process causing the ETCO₂ fall?

A woman undergoing emergency Caesarean section develops: • Sudden hypotension • Bronchospasm • Severe hypoxaemia immediately after delivery. Twenty minutes later: • Oozing from IV sites • Fibrinogen 0.7 g/L What diagnosis BEST explains the entire picture?

A patient undergoes awake craniotomy. During cortical stimulation: • Speech suddenly stops • Patient remains conscious • No motor weakness What is the MOST likely interpretation?

A 4-year-old child weighing 18 kg develops: • HR 170/min • Capillary refill 4 seconds • BP 90/60 mmHg after prolonged abdominal surgery. Estimated blood loss is 350 mL. What is the MOST important interpretation?

A patient undergoing one-lung ventilation has: • FiO₂ 100% • SpO₂ 84% • DLT position correct The surgeon asks: "Why is this happening if the lung is isolated properly?" What is the BEST explanation?

A patient undergoes thyroidectomy. During dissection: • HR falls from 75 to 35/min • BP falls to 70/40 mmHg The surgeon reports working close to the carotid bifurcation. What is the MOST likely mechanism?

A patient with septic shock has: • MAP 72 mmHg • Lactate 8 mmol/L • ScvO₂ 74% • Oliguria The junior doctor says: "The ScvO₂ is normal, so perfusion must be adequate." What is the BEST response?

A patient receives an interscalene block. Thirty minutes later: • Mild dyspnoea • Reduced ipsilateral diaphragmatic excursion • SpO₂ 99% What is the MOST likely explanation?

A patient undergoing robotic prostatectomy develops: • Facial oedema • Tongue swelling • Peak airway pressure rise after 6 hours in steep Trendelenburg. What is the MOST important concern?

The scenario is really an airway question. Airway oedema may make: • Extubation hazardous • Reintubation difficult A structured extubation plan is essential. Prometric Pearl Safe extubation requires the same planning as safe intubation.

A 62-year-old woman is undergoing laparoscopic hysterectomy. Ninety minutes into surgery: • ETCO₂ rises gradually from 35 to 52 mmHg • Temperature remains 36.8°C • HR remains 78/min • BP remains stable The trainee is concerned about malignant hyperthermia. What finding most strongly argues AGAINST malignant hyperthermia?

A 75-year-old man undergoes carotid endarterectomy under regional anaesthesia. During carotid cross-clamping: • He becomes confused • Speech becomes slurred • Contralateral arm weakness develops Blood pressure is 110/65 mmHg. What is the BEST immediate management?

A 28-year-old woman undergoes emergency Caesarean section. Ten minutes after delivery she develops: • Persistent uterine bleeding • BP 80/40 mmHg • HR 135/min The uterus is: • Soft • Enlarged • Poorly contracted What is the MOST likely cause of the haemorrhage?

A patient undergoing thoracotomy develops: • Severe postoperative pain • Poor cough • Reduced inspiratory effort Despite IV opioids. Which regional technique would most likely improve all three problems?

A 5-year-old child presents for emergency bronchoscopy. History: • Sudden choking episode • Persistent unilateral wheeze • Reduced air entry on the right What is the MOST likely diagnosis?

A patient undergoing scoliosis correction develops: • MEP amplitudes fall by 80% • SSEPs unchanged • MAP 45 mmHg What is the MOST likely explanation?

A patient receives an interscalene block. Thirty minutes later: • Ptosis • Miosis • Facial anhidrosis but no neurological deficit. What is the MOST likely diagnosis?

A patient undergoing pituitary surgery develops: • Urine output 1200 mL in 90 minutes • Serum sodium 152 mmol/L What is the MOST appropriate treatment?

A patient undergoing robotic prostatectomy has: • Peak pressure 42 cmH₂O • Plateau pressure 39 cmH₂O What is the BEST interpretation?

A patient undergoing posterior fossa surgery develops: • Sudden ETCO₂ drop • Hypotension • Desaturation The surgeon reports entering a venous sinus. What is the MOST likely diagnosis?

A 72-year-old woman undergoes cemented hemiarthroplasty for fractured neck of femur. Immediately after cement insertion: • ETCO₂ falls from 34 to 12 mmHg • BP falls from 140/80 to 60/30 mmHg • SpO₂ falls to 78% The surgeon asks: "Why did the ETCO₂ drop so dramatically?" What is the BEST physiological explanation?

A 30-year-old primigravida develops: • Persistent fetal bradycardia • Maternal BP 65/35 mmHg 5 minutes after spinal anaesthesia for Caesarean section. What is the MOST appropriate first intervention?

A patient undergoing carotid endarterectomy under regional anaesthesia suddenly develops: • Contralateral arm weakness • Slurred speech BP is 95/55 mmHg. What is the MOST likely diagnosis?

A 4-year-old child undergoes tonsillectomy. In recovery: • HR 165/min • Pale • Repeated swallowing • BP 85/50 mmHg The nurse reports: "The throat looks clean." What is the MOST likely diagnosis?

A patient undergoing one-lung ventilation develops: • SpO₂ 84% • FiO₂ 100% • DLT position correct What physiological mechanism is MOST responsible for preventing even worse hypoxaemia?

A patient undergoing thyroidectomy develops: • HR 35/min • BP 70/40 mmHg during dissection around the carotid bifurcation. What is the MOST likely mechanism?

A patient with septic shock has: • Lactate 9 mmol/L • ScvO₂ 78% • Oliguria • Mottled skin The junior trainee says: "ScvO₂ is normal, so tissue perfusion must be adequate." What is the BEST response?

A patient receives an interscalene block. After surgery: • Mild dyspnoea • Reduced diaphragmatic movement • SpO₂ 99% What is the MOST likely explanation?

A patient undergoes robotic radical prostatectomy. After 7 hours in steep Trendelenburg: • Facial oedema • Tongue swelling • Conjunctival oedema What is the MOST important concern before extubation?

A patient undergoing posterior fossa surgery develops: • Sudden ETCO₂ fall • Hypotension • SpO₂ 88% TEE demonstrates air in the right atrium. What is the MOST important immediate intervention?

A 68-year-old man undergoing laparotomy under TIVA has: • BIS 32 • BP 85/45 mmHg • HR 52/min The trainee decides to increase the propofol target because: "The patient is moving slightly." What is the MOST important concern with this decision?

A patient undergoing thoracic surgery on OLV develops: • SpO₂ 85% • FiO₂ 100% • DLT correctly positioned The surgeon asks: "Why isn't the oxygen level normal if the ventilated lung is receiving 100% oxygen?" What is the BEST explanation?

A labouring woman develops the following CTG: • Baseline 145 bpm • Variability 12 bpm • Recurrent variable decelerations What is the MOST likely cause?

A patient undergoing laparoscopic colectomy develops: • ETCO₂ rises from 38 to 65 mmHg • Temperature 40°C • HR 145/min • Generalised rigidity What is the MOST likely diagnosis?

A patient undergoing posterior fossa surgery develops: • Sudden ETCO₂ drop • Hypotension • Desaturation The surgeon reports: "I entered a large venous sinus." Which monitor would have detected this complication earliest?

A 5-year-old child undergoes adenotonsillectomy. Following extubation: • Severe inspiratory effort • No airflow • SpO₂ 60% Jaw thrust and CPAP fail. What is the BEST next step?

A patient with severe sepsis has: • Lactate 8 mmol/L • ScvO₂ 42% • Cardiac index 1.7 L/min/m² What is the MOST likely haemodynamic problem?

During endoscopic sinus surgery, visibility progressively worsens. ABG: • PaCO₂ 60 mmHg What is the MOST likely explanation?

A patient receives an interscalene block. Postoperatively: • Ptosis • Miosis • Facial anhidrosis No weakness elsewhere. What is the MOST likely diagnosis?

A patient undergoing robotic prostatectomy has: • Peak pressure 42 cmH₂O • Plateau pressure 40 cmH₂O What is the MOST likely explanation?

A patient undergoing laser excision of a vocal cord lesion develops flames from the airway. What is the FIRST action?

A trauma patient has: • Eyes open to speech • Confused conversation • Localises pain What is the GCS?

A patient undergoing scoliosis correction develops: • MEP loss • MAP 45 mmHg What is the MOST important first intervention?

A patient undergoing Caesarean section develops: • Sudden hypoxaemia • Severe hypotension • DIC What diagnosis best explains all findings?

A 72-year-old man undergoes hip fracture fixation under spinal anaesthesia. Thirty minutes later: • BP 65/35 mmHg • HR 38/min • Sensory block T2 What is the MOST likely diagnosis?