FREEMEDSITE MRCS ACADEMY · ARTICLE 18 · PRINCIPLES OF SURGERY

Perioperative Care, Anaesthesia and Surgical Complications Made Easy for MRCS Part A

Understand what happens before, during and after surgery: preoperative risk assessment, airway safety, fluids, anaesthesia, VTE prevention, sepsis, recovery and early surgical emergencies. Learn the concepts, complete your checklist and test yourself with 40 original clinical single-best-answer questions.

12Teaching modules

52Saved objectives

40Original SBAs

MRCS Paper 2Five-option A–E questionsSaved locally in this browser

Where to start: Read modules 1–12, tick the 52 learning objectives and answer the 40 SBA questions. All five options are explained; incorrect answers can be revisited.

How to use this lesson

Read each clinical concept, pause to predict the consequences, then apply it to a scenario. The revision checklist and quiz both save automatically on this browser (unless storage is blocked).

Learning aim: Recognise time-critical perioperative deterioration, distinguish prevention from treatment, and select a safe next step. Local protocols and senior clinical review always take precedence in real patients.

On this page

1. Preoperative assessment and fitness2. Airway assessment and aspiration risk3. Fasting, consent and perioperative safety checks4. IV fluid therapy, perfusion and blood loss5. General, regional and local anaesthesia6. Immediate postoperative recovery and monitoring7. Postoperative pain, nausea and ileus8. VTE risk assessment and prophylaxis9. Early postoperative complications: timing and detection10. SSI prevention, sepsis and source control11. AKI, urinary complications and systemic deterioration12. Enhanced recovery, nutrition and handover52-topic saved checklist40 clinical SBAsFAQsReferences and related articles

1. Preoperative assessment and fitness

Preoperative assessment is a risk-assessment process, not a request for every laboratory test. Establish procedure urgency, functional capacity, comorbidity, medication use, prior anaesthetic complications, airway problems, frailty and the need for optimisation. Discuss individual benefits and harms, obtain valid consent and ensure a safe postoperative plan.

ASA physical-status classification describes systemic disease burden, not the procedural risk by itself. ASA III denotes severe systemic disease; ASA IV denotes severe systemic disease posing a constant threat to life. Cardiac and pulmonary examination, ECG, blood tests and further investigations are targeted to the patient's condition and procedure under NICE NG45.

Clinical example: a healthy young adult having minor surgery does not automatically need a routine chest radiograph or coagulation panel. A symptomatic patient with unstable angina needs assessment and appropriate management rather than indiscriminate pre-op screening.

Clinical application

Clinical example: a healthy young adult having minor surgery does not automatically need a routine chest radiograph or coagulation panel. A symptomatic patient with unstable angina needs assessment and appropriate management rather than indiscriminate pre-op screening.

Exam pearl

Preoperative assessment is a risk-assessment process, not a request for every laboratory test.

2. Airway assessment and aspiration risk

Assess mouth opening, dental status, jaw protrusion, neck movement, obesity, obstructive sleep apnoea, previous difficult intubation and relevant airway pathology. A single Mallampati score cannot reliably predict all difficult airways; plan rescue strategies and call for experienced assistance when needed.

The immediate threat during an obstructed airway is failed oxygenation. Bag–mask ventilation, supraglottic airways and tracheal intubation are airway options according to a structured algorithm. If oxygenation cannot be achieved despite appropriate measures, emergency front-of-neck access is an expert-led rescue procedure.

A fasting patient can still aspirate when there are other risk factors, such as bowel obstruction, reflux or delayed gastric emptying. The anaesthetist selects airway and induction strategy based on the overall risk, rather than fasting time alone.

Clinical application

A fasting patient can still aspirate when there are other risk factors, such as bowel obstruction, reflux or delayed gastric emptying. The anaesthetist selects airway and induction strategy based on the overall risk, rather than fasting time alone.

Exam pearl

Assess mouth opening, dental status, jaw protrusion, neck movement, obesity, obstructive sleep apnoea, previous difficult intubation and relevant airway pathology.

3. Fasting, consent and perioperative safety checks

For many adults having elective surgery, NICE NG180 advises allowing clear fluids until 2 hours before the operation. This is not a blanket rule for patients with high aspiration risk, and local anaesthesia protocols still apply. Solids have longer fasting periods and should follow the anaesthetic team's instructions.

The WHO surgical safety checklist has three communication phases: Sign In before induction, Time Out before incision, and Sign Out before leaving theatre. They check identity, procedure and site, safety concerns, prophylaxis when applicable, equipment and handover issues.

Informed consent addresses material risks, alternatives and the option of no treatment. Site marking is a separate verification step; neither consent nor a correctly completed form replaces active patient–team communication.

Clinical application

Informed consent addresses material risks, alternatives and the option of no treatment. Site marking is a separate verification step; neither consent nor a correctly completed form replaces active patient–team communication.

Exam pearl

For many adults having elective surgery, NICE NG180 advises allowing clear fluids until 2 hours before the operation.

4. IV fluid therapy, perfusion and blood loss

NICE CG174 organises IV fluids around five requirements: resuscitation, routine maintenance, replacement, redistribution and reassessment. These are the 5 Rs. Fluid type and rate depend on examination, perfusion, losses, renal function, electrolytes and frequent review.

Hypovolaemia can reduce venous return, preload, stroke volume and urine output. Lactate can reflect impaired perfusion but is not specific for a single cause. A fluid challenge is a reassessed intervention, not an order to give repeated large boluses indefinitely.

Normal saline is chloride-rich and large loads can cause hyperchloraemic metabolic acidosis. Balanced crystalloids are often considered for resuscitation, guided by patient factors and local policies. Haemorrhagic shock demands rapid control of bleeding and appropriate blood-product resuscitation, not crystalloid alone.

Clinical application

Normal saline is chloride-rich and large loads can cause hyperchloraemic metabolic acidosis. Balanced crystalloids are often considered for resuscitation, guided by patient factors and local policies. Haemorrhagic shock demands rapid control of bleeding and appropriate blood-product resuscitation, not crystalloid alone.

Exam pearl

NICE CG174 organises IV fluids around five requirements: resuscitation, routine maintenance, replacement, redistribution and reassessment.

5. General, regional and local anaesthesia

General anaesthesia provides unconsciousness and may involve hypnosis, analgesia and muscle relaxation using different drug classes. Local anaesthetics block voltage-gated sodium channels; spinal anaesthesia introduces drug into CSF and epidural anaesthesia deposits drug outside the dura.

Spinal sympathetic blockade causes vasodilatation and hypotension; a high neuraxial block may compromise breathing and cardiovascular function. Neuraxial techniques require review of anticoagulant use, coagulation status, infection, neurological disease and consent.

Local-anaesthetic systemic toxicity can present with perioral numbness, tinnitus, seizures, arrhythmia or cardiovascular collapse. Stop injection, summon help, secure oxygenation and follow a current institutional rescue protocol that includes lipid emulsion when indicated.

Clinical application

Local-anaesthetic systemic toxicity can present with perioral numbness, tinnitus, seizures, arrhythmia or cardiovascular collapse. Stop injection, summon help, secure oxygenation and follow a current institutional rescue protocol that includes lipid emulsion when indicated.

Exam pearl

General anaesthesia provides unconsciousness and may involve hypnosis, analgesia and muscle relaxation using different drug classes.

6. Immediate postoperative recovery and monitoring

Recovery observations include airway patency, respiratory rate, oxygenation, mental status, pulse, blood pressure, temperature, pain, nausea, bleeding and urine output as appropriate. Sedation and opioid exposure are major contributors to early hypoventilation.

A newly drowsy patient with low respiratory rate after opioid administration may have opioid-induced respiratory depression. Assess ABCs, support breathing, review medications and use titrated reversal according to local protocol when required; do not assume every postoperative desaturation is atelectasis.

Persistent hypotension requires a systematic differential: haemorrhage, inadequate circulating volume, myocardial events, sepsis, anaphylaxis, drug effects and neuraxial sympathetic blockade. Reassessment is more important than any one isolated monitor reading.

Clinical application

Persistent hypotension requires a systematic differential: haemorrhage, inadequate circulating volume, myocardial events, sepsis, anaphylaxis, drug effects and neuraxial sympathetic blockade. Reassessment is more important than any one isolated monitor reading.

Exam pearl

Recovery observations include airway patency, respiratory rate, oxygenation, mental status, pulse, blood pressure, temperature, pain, nausea, bleeding and urine output as appropriate.

7. Postoperative pain, nausea and ileus

Multimodal analgesia uses different mechanisms to reduce pain and opioid exposure while considering contraindications. After abdominal surgery, early mobilisation, judicious opioids, appropriate nutrition and evidence-based enhanced recovery practices are important.

Postoperative nausea and vomiting risk rises with several patient, procedure and anaesthetic factors, including opioid use and prior PONV. Prevention may involve multiple antiemetic mechanisms in higher-risk patients. In a patient with severe vomiting and distension, exclude obstruction or complications before assuming routine nausea.

Postoperative ileus is functional failure of normal gut propulsion; mechanical obstruction involves a physical blockage. Clinical features, surgery history and examination determine when urgent imaging is needed.

Clinical application

Postoperative ileus is functional failure of normal gut propulsion; mechanical obstruction involves a physical blockage. Clinical features, surgery history and examination determine when urgent imaging is needed.

Exam pearl

Multimodal analgesia uses different mechanisms to reduce pain and opioid exposure while considering contraindications.

8. VTE risk assessment and prophylaxis

Venous thrombosis is influenced by Virchow’s triad: venous stasis, endothelial injury and hypercoagulability. Surgical patients should have documented VTE and bleeding risk assessment and reassessment when their clinical state changes.

Mechanical and pharmacological prophylaxis are selected according to procedure, immobility, renal function, bleeding risk and contraindications. NICE NG89 has population-specific protocols; it does not justify giving the same anticoagulant to every postoperative patient.

Sudden dyspnoea, pleuritic chest pain, tachycardia or hypotension after surgery raises concern for pulmonary embolism among other causes. Assess immediately; investigation and treatment depend on stability and pre-test probability.

Clinical application

Sudden dyspnoea, pleuritic chest pain, tachycardia or hypotension after surgery raises concern for pulmonary embolism among other causes. Assess immediately; investigation and treatment depend on stability and pre-test probability.

Exam pearl

Venous thrombosis is influenced by Virchow’s triad: venous stasis, endothelial injury and hypercoagulability.

9. Early postoperative complications: timing and detection

Examine early postoperative deterioration by time course but avoid rigid “day-by-day fever rules”. In the first hours, consider respiratory depression, haemorrhage, myocardial events, aspiration and transfusion reactions; later causes include infection, VTE and wound problems.

Postoperative fever is not synonymous with infection. Review vital signs, wound, chest, urinary and abdominal symptoms, devices, medications and the operative procedure. Blood cultures and antibiotics are indicated by the clinical syndrome, not fever alone.

When wound dehiscence or evisceration occurs, protect exposed viscera with sterile saline-moistened dressings, stabilise the patient and obtain urgent surgical review. Never attempt forceful reduction of exposed bowel in a ward corridor.

Clinical application

When wound dehiscence or evisceration occurs, protect exposed viscera with sterile saline-moistened dressings, stabilise the patient and obtain urgent surgical review. Never attempt forceful reduction of exposed bowel in a ward corridor.

Exam pearl

Examine early postoperative deterioration by time course but avoid rigid “day-by-day fever rules”.

10. SSI prevention, sepsis and source control

NICE NG125 recommends measures throughout the operative pathway: appropriate antimicrobial prophylaxis for indicated operations, aseptic technique, appropriate skin preparation, temperature management and careful wound management. Routine prophylaxis is not the same as treating infection.

A patient who is deteriorating with suspected sepsis needs rapid ABC assessment, cultures where feasible without delaying essential care, appropriate antimicrobials, haemodynamic evaluation and prompt identification of any drainable or surgically treatable source.

Superficial incisional SSI affects skin/subcutaneous tissue; deep incisional infection involves fascia/muscle; organ-space infection affects an opened or manipulated internal compartment. Antibiotics alone cannot reliably replace necessary abscess drainage or debridement.

Clinical application

Superficial incisional SSI affects skin/subcutaneous tissue; deep incisional infection involves fascia/muscle; organ-space infection affects an opened or manipulated internal compartment. Antibiotics alone cannot reliably replace necessary abscess drainage or debridement.

Exam pearl

NICE NG125 recommends measures throughout the operative pathway: appropriate antimicrobial prophylaxis for indicated operations, aseptic technique, appropriate skin preparation, temperature management and careful wound management.

11. AKI, urinary complications and systemic deterioration

Postoperative oliguria can reflect hypovolaemia, intrinsic renal injury, urinary obstruction, medications or physiology around major surgery. First review perfusion, fluid balance, medications and the urinary catheter; then interpret creatinine, urine output and electrolytes in context.

Acute kidney injury is a clinical syndrome of deteriorating filtration. A normal early creatinine does not exclude evolving AKI, and urine output alone cannot prove intrinsic kidney disease. Persistent hyperkalaemia, severe acidosis or fluid overload may require escalation and specialist support.

Myocardial injury, postoperative delirium and respiratory complications can be subtle. A new change in consciousness, oxygen requirement or haemodynamics should trigger structured assessment instead of waiting for the next routine observation round.

Clinical application

Myocardial injury, postoperative delirium and respiratory complications can be subtle. A new change in consciousness, oxygen requirement or haemodynamics should trigger structured assessment instead of waiting for the next routine observation round.

Exam pearl

Postoperative oliguria can reflect hypovolaemia, intrinsic renal injury, urinary obstruction, medications or physiology around major surgery.

12. Enhanced recovery, nutrition and handover

Enhanced Recovery After Surgery (ERAS) bundles preoperative information and optimisation, evidence-based fasting, multimodal analgesia, reduced unnecessary devices, appropriate nutrition, early mobilisation and clear discharge planning. It is tailored to procedure and patient, not a universal fixed protocol.

Handover must communicate the operation, complications, anticipated airway or bleeding risks, drains, fluids, analgesia, anticoagulation, antibiotics, monitoring frequency and escalation thresholds. Inadequate communication at transfer to recovery or ward can undermine technically successful surgery.

Exam approach: when asked for the “best next step” in a deteriorating postoperative patient, stabilise ABCs, identify the time-critical diagnosis and initiate targeted management. Definitive diagnosis and treatment are often simultaneous rather than strictly sequential.

Clinical application

Exam approach: when asked for the “best next step” in a deteriorating postoperative patient, stabilise ABCs, identify the time-critical diagnosis and initiate targeted management. Definitive diagnosis and treatment are often simultaneous rather than strictly sequential.

Exam pearl

Enhanced Recovery After Surgery (ERAS) bundles preoperative information and optimisation, evidence-based fasting, multimodal analgesia, reduced unnecessary devices, appropriate nutrition, early mobilisation and clear discharge planning.

52-topic interactive revision checklist

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Preoperative assessment

Procedure urgency and surgical riskFunctional capacity and exercise toleranceASA I–VI overview and limitationsTargeted preoperative investigationsConsent and shared decision-makingPreoperative medication review and optimisation

Airway and aspiration

Airway history and prior anaesthetic problemsMallampati, mouth opening and neck mobilityOxygenation and rescue pathwayAspiration risks and full-stomach context

Fasting and WHO checklist

Elective clear-fluid fasting rule and exceptionsWHO Sign In, Time Out and Sign OutSite, patient and procedure verificationMaterial risks and surgical consent

Fluids and blood loss

5 Rs of IV fluid prescribingSigns of inadequate tissue perfusionHaemorrhage assessment and source controlNormal saline and chloride loadCrystalloid response and frequent reassessment

Anaesthetic techniques

General anaesthesia componentsSpinal versus epidural anatomySpinal sympathetic blockadeLocal anaesthetic systemic toxicity

Recovery

Post-anaesthesia ABC monitoringOpioid-related respiratory depressionHypotension differential diagnosisPostoperative bleeding and transfusion complications

Analgesia and GI recovery

Multimodal analgesia principlePONV risk factors and preventionFunctional ileus versus mechanical obstructionEarly oral intake and mobilisation

VTE

Virchow triadVTE versus bleeding risk assessmentMechanical prophylaxis optionsAnticoagulant contraindications and renal issues

Postoperative complications

Postoperative fever structured differentialAnastomotic leak red flagsWound dehiscence and evisceration responsePostoperative myocardial and pulmonary complications

SSI and sepsis

SSI superficial, deep and organ spaceAntibiotic prophylaxis versus treatmentSepsis early assessmentCulture sampling and source control

AKI and urinary physiology

AKI staging principlesOliguria and catheter obstructionMedication and haemodynamic AKI contributorsSevere electrolyte derangements

Enhanced recovery and handover

ERAS bundle overviewNutrition and mobilisation after surgeryEffective postoperative handoverSafety-netting and discharge planningDischarge transport and supervision after anaesthesia

40 original MRCS clinical single-best-answer questions

These are newly written educational questions, not reproductions of examination recalls. Each has five options and one best answer. Every option is explained, followed by an exam pearl, examiner trap and answered viva follow-up.

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Question 1 of 40

Question 1 of 40 · Pre-op assessment

Q01. A healthy 23-year-old woman is scheduled for uncomplicated minor day surgery and has no cardiopulmonary symptoms. What is the most appropriate investigation strategy?

A. Request tests selectively according to clinical and procedural riskB. Request echocardiography routinelyC. Perform arterial blood gas analysis before anaesthesiaD. Order a chest radiograph routinelyE. Order coagulation tests in every patient

View detailed explanation, examiner trap and viva

Correct answer: A. Request tests selectively according to clinical and procedural risk

Why correct: Correct: use the history, examination, comorbidity, procedure and NICE NG45 to select investigations.

Why the other options are incorrect:

B. Request echocardiography routinely: Echo is reserved for appropriate clinical indications such as suspected structural heart disease.

C. Perform arterial blood gas analysis before anaesthesia: ABG is not standard screening for otherwise healthy minor surgery.

D. Order a chest radiograph routinely: Routine CXR in a healthy asymptomatic low-risk patient offers little benefit.

E. Order coagulation tests in every patient: Coagulation tests should be prompted by relevant history, medicine use or procedural considerations.

Exam pearl: Routine preoperative tests are not a universal panel.

Examiner trap: Preoperative testing is risk-stratified, not age-independent automatic screening.

Viva extension — When does an ECG add value? When patient factors, cardiovascular history or operation severity justify it.

Question 2 of 40 · ASA classification

Q02. A patient with severe chronic systemic disease that limits ordinary activity is assessed before major surgery; it does not pose a constant immediate threat to life. Which ASA class best fits?

A. ASA VB. ASA IIIC. ASA IID. ASA IE. ASA IV

View detailed explanation, examiner trap and viva

Correct answer: B. ASA III

Why correct: Correct: ASA III is severe systemic disease with substantive functional limitation, without the constant-threat feature of ASA IV.

Why the other options are incorrect:

A. ASA V: ASA V is moribund and not expected to survive without the operation.

C. ASA II: ASA II describes mild systemic disease without substantive functional limitation.

D. ASA I: ASA I means a healthy patient without systemic disease.

E. ASA IV: ASA IV denotes severe systemic disease that is a constant threat to life.

Exam pearl: ASA class describes physical status, not the surgical procedure itself.

Examiner trap: Do not confuse severe disease (III) with constant threat to life (IV).

Viva extension — What is ASA VI? A declared brain-dead organ donor.

Question 3 of 40 · Functional status

Q03. A 67-year-old patient scheduled for elective abdominal surgery reports being able to climb two flights of stairs without symptoms. What does this history primarily estimate?

A. Airway Mallampati gradeB. Pulmonary diffusion capacityC. Functional exercise capacityD. Postoperative haemoglobinE. Renal concentrating ability

View detailed explanation, examiner trap and viva

Correct answer: C. Functional exercise capacity

Why correct: Correct: exercise tolerance is a pragmatic estimate of functional capacity and cardiovascular reserve.

Why the other options are incorrect:

A. Airway Mallampati grade: Mallampati is assessed by oropharyngeal examination.

B. Pulmonary diffusion capacity: DLCO is measured by pulmonary function testing, not stair climbing.

D. Postoperative haemoglobin: Haemoglobin is measured by a blood test and cannot be inferred precisely from stair climbing.

E. Renal concentrating ability: Renal concentration ability is a distinct physiological process.

Exam pearl: Functional capacity informs risk assessment; symptoms still matter.

Examiner trap: Good stair climbing does not eliminate cardiac risk in all patients.

Viva extension — What else influences perioperative cardiac risk? Active cardiac conditions, comorbidities and procedure urgency.

Question 4 of 40 · Fasting

Q04. A low-aspiration-risk adult scheduled for elective surgery asks when to stop drinking water. What is the usual advice consistent with NICE NG180?

A. Clear fluids may be taken until inductionB. Clear fluids are always prohibited from midnightC. Only milk is allowed within 2 hoursD. Drink clear fluids until about 2 hours before surgeryE. Stop all fluids 12 hours before surgery

View detailed explanation, examiner trap and viva

Correct answer: D. Drink clear fluids until about 2 hours before surgery

Why correct: Correct: for many adults, clear fluids may be continued until 2 hours before elective surgery, with individual exceptions.

Why the other options are incorrect:

A. Clear fluids may be taken until induction: Intake immediately before induction is not the usual rule.

B. Clear fluids are always prohibited from midnight: Universal midnight fasting is outdated for clear liquids in many patients.

C. Only milk is allowed within 2 hours: Milk is not treated as a clear fluid.

E. Stop all fluids 12 hours before surgery: A blanket 12-hour fluid restriction is excessive for many elective cases.

Exam pearl: Clear liquids and solids have different fasting rules.

Examiner trap: Bowel obstruction or delayed gastric emptying changes aspiration planning.

Viva extension — Name a clear fluid. Water is a common example.? Review the learning point.

Question 5 of 40 · Aspiration

Q05. An emergency laparotomy patient has bowel obstruction and repeated vomiting. Which feature most directly increases aspiration risk at induction?

A. Absence of a heart murmurB. Normal blood pressureC. A low body temperatureD. Normal serum sodiumE. Retained gastric contents despite fasting

View detailed explanation, examiner trap and viva

Correct answer: E. Retained gastric contents despite fasting

Why correct: Correct: obstruction and vomiting can lead to retained gastric contents, even after a period without oral intake.

Why the other options are incorrect:

A. Absence of a heart murmur: Heart murmur status does not establish gastric content volume.

B. Normal blood pressure: Blood pressure does not exclude aspiration risk.

C. A low body temperature: Temperature is not the defining risk in this scenario.

D. Normal serum sodium: Normal sodium does not exclude a full stomach.

Exam pearl: A fasting clock does not guarantee an empty stomach.

Examiner trap: Do not apply routine elective fasting assumptions to obstructed emergency patients.

Viva extension — What is the underlying harm? Regurgitated gastric material entering the lower airway.

Question 6 of 40 · Airway assessment

Q06. A 48-year-old previously required a difficult tracheal intubation and is scheduled for thyroid surgery. What is the best approach?

A. Review airway records and create a planned and rescue oxygenation strategyB. Avoid asking about prior anaesthesiaC. Rely only on a single Mallampati scoreD. Wait until induction before preparing extra airway equipmentE. Assume this intubation will be easy because it was successful previously

View detailed explanation, examiner trap and viva

Correct answer: A. Review airway records and create a planned and rescue oxygenation strategy

Why correct: Correct: previous airway history is highly relevant; prepare a primary and rescue plan with appropriate expertise.

Why the other options are incorrect:

B. Avoid asking about prior anaesthesia: Omitting previous airway problems is unsafe.

C. Rely only on a single Mallampati score: No one airway test is a sufficient standalone predictor.

D. Wait until induction before preparing extra airway equipment: Planning must occur before induction, not after failed oxygenation.

E. Assume this intubation will be easy because it was successful previously: Prior success does not remove risk at the next procedure.

Exam pearl: Prior difficult airway is an important predictor of future difficulty.

Examiner trap: Difficult intubation and difficult oxygenation are related but distinct.

Viva extension — What is the immediate priority in failed intubation? Maintaining oxygenation.

Question 7 of 40 · WHO checklist

Q07. At which WHO surgical safety checklist phase is a team pause performed immediately before skin incision?

A. Pre-assessment clinicB. Time OutC. Discharge roundD. Induction handover onlyE. Sign Out

View detailed explanation, examiner trap and viva

Correct answer: B. Time Out

Why correct: Correct: Time Out occurs before incision and confirms shared patient/procedure/site details and anticipated concerns.

Why the other options are incorrect:

A. Pre-assessment clinic: Clinic assessment is separate from the intraoperative checklist pause.

C. Discharge round: Discharge planning is later.

D. Induction handover only: Sign In is performed before induction, not the pre-incision pause.

E. Sign Out: Sign Out is completed before leaving the operating room.

Exam pearl: Sign In → Time Out → Sign Out.

Examiner trap: A signed form does not replace a spoken team pause.

Viva extension — When is Sign Out performed? Before the patient leaves the operating room.

Question 8 of 40 · Consent

Q08. A capable patient agrees to surgery but asks whether non-operative treatment is reasonable. What best reflects valid consent?

A. Alternatives only matter if the patient requests them twiceB. A signature alone is sufficientC. Discuss reasonable alternatives, material risks and no treatmentD. Explain only risks that occur in more than 10% of casesE. Surgeon decides which alternatives may be mentioned

View detailed explanation, examiner trap and viva

Correct answer: C. Discuss reasonable alternatives, material risks and no treatment

Why correct: Correct: shared decision-making includes material risks, alternatives and the option of no intervention.

Why the other options are incorrect:

A. Alternatives only matter if the patient requests them twice: Relevant options should be presented without arbitrary repeated requests.

B. A signature alone is sufficient: A form supports documentation but does not substitute for discussion.

D. Explain only risks that occur in more than 10% of cases: Materiality is not defined by an arbitrary frequency threshold alone.

E. Surgeon decides which alternatives may be mentioned: Consent must respect the patient’s informed choice.

Exam pearl: Discuss what matters to this patient, not just a standard risk list.

Examiner trap: Rare but serious outcomes may be material.

Viva extension — Can a capable patient withdraw consent? Yes, before an intervention.

Question 9 of 40 · IV fluids

Q09. A postoperative patient needs IV resuscitation after substantial gastrointestinal fluid losses. Which NICE framework is used to guide fluid prescribing?

A. The Glasgow coma scaleB. The Child–Pugh scoreC. The Wells scoreD. The 5 Rs of IV fluid therapyE. The 3 Ps of trauma

View detailed explanation, examiner trap and viva

Correct answer: D. The 5 Rs of IV fluid therapy

Why correct: Correct: resuscitation, routine maintenance, replacement, redistribution and reassessment guide IV-fluid prescriptions.

Why the other options are incorrect:

A. The Glasgow coma scale: GCS measures level of consciousness.

B. The Child–Pugh score: Child–Pugh assesses chronic liver disease severity.

C. The Wells score: Wells estimates VTE probability in a different context.

E. The 3 Ps of trauma: The 3 Ps do not provide this NICE fluid framework.

Exam pearl: Every fluid prescription needs a goal and reassessment.

Examiner trap: Resuscitation is not interchangeable with routine maintenance.

Viva extension — What is the fifth R? Reassessment.

Question 10 of 40 · Perfusion

Q10. A hypotensive patient is cool, clammy and oliguric after abdominal surgery. Which physiological process is most likely driving reduced urine output?

A. Mandatory acute renal tubular necrosisB. Complete absence of antidiuretic hormoneC. Increased renal perfusion pressureD. Increased filtered sodium delivery from improved cardiac outputE. Reduced renal perfusion due to lower effective circulating volume

View detailed explanation, examiner trap and viva

Correct answer: E. Reduced renal perfusion due to lower effective circulating volume

Why correct: Correct: reduced effective circulating volume and perfusion commonly produce early oliguria.

Why the other options are incorrect:

A. Mandatory acute renal tubular necrosis: Intrinsic tubular injury is possible later but not proven immediately.

B. Complete absence of antidiuretic hormone: ADH is usually activated, not necessarily absent, during hypovolaemia.

C. Increased renal perfusion pressure: Renal perfusion is more likely impaired in this shocked patient.

D. Increased filtered sodium delivery from improved cardiac output: Improved cardiac output would tend to support renal perfusion.

Exam pearl: Oliguria is a sign, not a diagnosis.

Examiner trap: Assess hypovolaemia, obstruction and renal injury rather than assuming ATN.

Viva extension — What should you assess first? ABCs, perfusion, bleeding, fluids and catheter patency.

Question 11 of 40 · Haemorrhagic shock

Q11. A patient rapidly deteriorates with brisk postoperative bleeding. Which intervention most directly treats the primary cause?

A. Treat the cause of bleeding with urgent haemorrhage controlB. Provide maintenance crystalloid onlyC. Wait for a routine morning haemoglobinD. Administer prophylactic low-molecular-weight heparinE. Give oral iron immediately

View detailed explanation, examiner trap and viva

Correct answer: A. Treat the cause of bleeding with urgent haemorrhage control

Why correct: Correct: urgent identification and control of bleeding plus appropriate resuscitation addresses the cause.

Why the other options are incorrect:

B. Provide maintenance crystalloid only: Maintenance fluids alone do not correct ongoing major bleeding.

C. Wait for a routine morning haemoglobin: Delaying assessment is dangerous in active haemorrhage.

D. Administer prophylactic low-molecular-weight heparin: Anticoagulation would be inappropriate during uncontrolled active bleeding.

E. Give oral iron immediately: Iron replacement does not arrest acute haemorrhage.

Exam pearl: Source control is decisive in haemorrhagic shock.

Examiner trap: Normal initial haemoglobin does not exclude acute haemorrhage.

Viva extension — What else is needed? ABC resuscitation, crossmatch, blood products when indicated and senior surgical review.

Question 12 of 40 · Hyperchloraemia

Q12. After large-volume 0.9% saline administration, an ICU patient has low bicarbonate with a normal anion gap. Which mechanism best explains it?

A. Ketone productionB. Relative chloride excess causing hyperchloraemic metabolic acidosisC. Lactic acidosis from excess lactate productionD. Loss of gastric hydrochloric acidE. Acute respiratory alkalosis

View detailed explanation, examiner trap and viva

Correct answer: B. Relative chloride excess causing hyperchloraemic metabolic acidosis

Why correct: Correct: chloride-rich saline can reduce strong-ion difference and cause normal-anion-gap acidosis.

Why the other options are incorrect:

A. Ketone production: Ketoacidosis increases unmeasured anions.

C. Lactic acidosis from excess lactate production: Lactic acidosis is generally a raised-anion-gap process.

D. Loss of gastric hydrochloric acid: Gastric acid loss tends to cause metabolic alkalosis.

E. Acute respiratory alkalosis: Respiratory alkalosis is driven by reduced PaCO2.

Exam pearl: Excess 0.9% saline may cause hyperchloraemic acidosis.

Examiner trap: Do not automatically attribute all postoperative acidosis to lactate.

Viva extension — Name another cause of normal-anion-gap acidosis. Diarrhoeal bicarbonate loss.? Review the learning point.

Question 13 of 40 · Spinal anaesthesia

Q13. A patient becomes hypotensive shortly after spinal anaesthesia. Which direct physiological effect is most likely?

A. Primary right ventricular infarctionB. Complete vagus-nerve transectionC. Sympathetic blockade with arterial and venous vasodilatationD. Sudden massive catecholamine surgeE. Generalised histamine-mediated anaphylaxis in every case

View detailed explanation, examiner trap and viva

Correct answer: C. Sympathetic blockade with arterial and venous vasodilatation

Why correct: Correct: neuraxial sympathetic blockade decreases vascular tone and venous return.

Why the other options are incorrect:

A. Primary right ventricular infarction: MI is not the direct mechanism of typical spinal hypotension.

B. Complete vagus-nerve transection: No vagus transection occurs.

D. Sudden massive catecholamine surge: Sympathetic blockade generally reduces, rather than increases, sympathetic vasoconstriction.

E. Generalised histamine-mediated anaphylaxis in every case: Anaphylaxis is an important alternative diagnosis but not inevitable after spinal anaesthesia.

Exam pearl: Spinal hypotension is often related to sympathetic block.

Examiner trap: A very high block may also cause bradycardia and respiratory compromise.

Viva extension — What must be monitored? Blood pressure, heart rate, level of block and oxygenation.

Question 14 of 40 · Regional anaesthesia

Q14. A clinician injects local anaesthetic into the lumbar subarachnoid space. What technique has been performed?

A. Thoracic epidural blockB. Caudal epidural blockC. Peripheral femoral nerve blockD. Spinal anaesthesiaE. Local wound infiltration

View detailed explanation, examiner trap and viva

Correct answer: D. Spinal anaesthesia

Why correct: Correct: spinal anaesthesia deposits local anaesthetic in CSF within the subarachnoid space.

Why the other options are incorrect:

A. Thoracic epidural block: An epidural is outside the dura, not intrathecal.

B. Caudal epidural block: Caudal epidural injection lies outside the dura via the sacral hiatus.

C. Peripheral femoral nerve block: Peripheral block targets a specific nerve or plexus.

E. Local wound infiltration: Infiltration is into the local tissue.

Exam pearl: Spinal = intrathecal; epidural = extradural.

Examiner trap: An epidural catheter cannot be assumed to lie in CSF.

Viva extension — What important sympathetic effect occurs? Vasodilatation and possible hypotension.

Question 15 of 40 · Local anaesthetic toxicity

Q15. A patient develops tinnitus, perioral tingling and then seizures immediately after a peripheral nerve block. What complication should be suspected?

A. Surgical wound infectionB. Hypokalaemic periodic paralysisC. Pulmonary oedema from fluid excessD. Malignant hyperthermiaE. Local anaesthetic systemic toxicity

View detailed explanation, examiner trap and viva

Correct answer: E. Local anaesthetic systemic toxicity

Why correct: Correct: early neurological symptoms progressing to seizures suggest systemic local anaesthetic toxicity.

Why the other options are incorrect:

A. Surgical wound infection: A wound infection is not an immediate injected-drug reaction.

B. Hypokalaemic periodic paralysis: The temporal relationship to anaesthetic injection and neurological prodrome does not fit this condition.

C. Pulmonary oedema from fluid excess: Fluid overload is not the classic immediate neurological prodrome.

D. Malignant hyperthermia: Malignant hyperthermia has a different pattern involving hypermetabolism and triggered anaesthetic agents.

Exam pearl: Recognise LAST early and initiate emergency support.

Examiner trap: Seizures after local block are not always epilepsy.

Viva extension — What rescue drug class is used in severe LAST? Intravenous lipid emulsion per rescue protocol.

Question 16 of 40 · Opioid depression

Q16. In the recovery area, a patient given repeated IV opioids is difficult to rouse, has pinpoint pupils and a respiratory rate of 6/min. What is the immediate concern?

A. Opioid-induced ventilatory depressionB. Deep-vein thrombosisC. Acute surgical site infectionD. Postoperative hypocalcaemiaE. Early postoperative bowel obstruction

View detailed explanation, examiner trap and viva

Correct answer: A. Opioid-induced ventilatory depression

Why correct: Correct: opioid-induced respiratory depression requires airway and breathing support and appropriate reversal when indicated.

Why the other options are incorrect:

B. Deep-vein thrombosis: DVT is not the characteristic immediate triad.

C. Acute surgical site infection: SSI is unlikely to cause such abrupt respiratory slowing with pinpoint pupils.

D. Postoperative hypocalcaemia: Hypocalcaemia produces neuromuscular excitability, not this typical opioid pattern.

E. Early postoperative bowel obstruction: Bowel obstruction does not best explain marked bradypnoea and miosis.

Exam pearl: ABCs and ventilation first; consider titrated naloxone.

Examiner trap: Oxygen saturation can temporarily appear reassuring despite hypoventilation when supplemental oxygen is used.

Viva extension — Why monitor after naloxone? It may wear off before the opioid effect ends.

Question 17 of 40 · Early hypotension

Q17. A patient 30 minutes after major surgery is tachycardic, hypotensive and has rapidly increasing drain output. What diagnosis takes priority?

A. Fat-soluble vitamin deficiencyB. Ongoing haemorrhageC. ConstipationD. Postoperative wound hypertrophyE. Urinary tract infection

View detailed explanation, examiner trap and viva

Correct answer: B. Ongoing haemorrhage

Why correct: Correct: active bleeding requires urgent resuscitation and surgical assessment.

Why the other options are incorrect:

A. Fat-soluble vitamin deficiency: Vitamin deficiency cannot explain rapidly increasing bloody output.

C. Constipation: Constipation is not the immediate explanation for shock with blood loss.

D. Postoperative wound hypertrophy: Scar hypertrophy develops later.

E. Urinary tract infection: UTI is not the leading diagnosis in this time-sensitive setting.

Exam pearl: Drain output plus shock demands haemorrhage assessment.

Examiner trap: Do not wait for a haemoglobin fall to recognise acute blood loss.

Viva extension — What next? ABCs, rapid senior review, blood products and bleeding control as indicated.

Question 18 of 40 · PONV

Q18. A patient with previous severe postoperative nausea is planned for another operation. What is the best general preventive approach?

A. Ignore previous PONV because it is unrelated to riskB. Use opioids as the only preventive measureC. Risk-stratified multimodal antiemetic and opioid-sparing approachD. Withhold IV fluids in all casesE. Prescribe antibiotics routinely to prevent nausea

View detailed explanation, examiner trap and viva

Correct answer: C. Risk-stratified multimodal antiemetic and opioid-sparing approach

Why correct: Correct: prevention should account for risk factors, anaesthetic technique and antiemetic mechanisms.

Why the other options are incorrect:

A. Ignore previous PONV because it is unrelated to risk: Previous PONV is a recognised risk factor.

B. Use opioids as the only preventive measure: Opioids can increase PONV risk.

D. Withhold IV fluids in all cases: Routine fluid withholding is not a PONV prevention strategy.

E. Prescribe antibiotics routinely to prevent nausea: Antibiotics do not prevent anaesthesia-related nausea.

Exam pearl: A prior history of PONV increases future risk.

Examiner trap: Severe nausea with distension may indicate a surgical complication.

Viva extension — Name a non-drug preventive factor. Minimising unnecessary perioperative opioid exposure.? Review the learning point.

Question 19 of 40 · Postoperative ileus

Q19. A patient after bowel surgery has diffuse distension, absent flatus and delayed passage of stool. Imaging shows diffuse bowel dilatation without a transition point. What is most likely?

A. Mechanical obstruction from a single fixed transitionB. Acute pancreatitis in every caseC. PneumothoraxD. Postoperative ileusE. Mesenteric arterial aneurysm

View detailed explanation, examiner trap and viva

Correct answer: D. Postoperative ileus

Why correct: Correct: a functional motility disorder produces diffuse dilatation without a definite obstructing lesion.

Why the other options are incorrect:

A. Mechanical obstruction from a single fixed transition: Mechanical obstruction commonly suggests a transition point, though overlap exists.

B. Acute pancreatitis in every case: The stem lacks specific pancreatic features.

C. Pneumothorax: Pneumothorax does not explain diffuse bowel dilatation.

E. Mesenteric arterial aneurysm: Mesenteric aneurysm is not suggested by these findings.

Exam pearl: Ileus is functional; obstruction is mechanical.

Examiner trap: A prolonged or worsening course needs reassessment for leak, obstruction or other pathology.

Viva extension — What drugs may exacerbate ileus? Opioids.

Question 20 of 40 · Enhanced recovery

Q20. What is a central feature of an enhanced recovery programme after suitable elective major surgery?

A. Mandatory bed rest for at least a weekB. Routine prolonged nasogastric tubes for all patientsC. Complete avoidance of postoperative nutritionD. Routine prophylactic antibiotics until dischargeE. Minimise unnecessary fasting and promote appropriate early mobilisation

View detailed explanation, examiner trap and viva

Correct answer: E. Minimise unnecessary fasting and promote appropriate early mobilisation

Why correct: Correct: ERAS emphasises multimodal, evidence-based care including timely nutrition and mobilisation.

Why the other options are incorrect:

A. Mandatory bed rest for at least a week: Prolonged bed rest raises VTE and deconditioning risks.

B. Routine prolonged nasogastric tubes for all patients: Routine unnecessary tubes can impair recovery.

C. Complete avoidance of postoperative nutrition: Appropriate early nutrition is often encouraged rather than universally avoided.

D. Routine prophylactic antibiotics until discharge: Antibiotic duration is governed by infection/procedure guidance, not routine discharge timing.

Exam pearl: ERAS is a pathway, not one medication.

Examiner trap: ERAS still requires individual modification for major complications.

Viva extension — Name another ERAS element. Multimodal opioid-sparing analgesia.? Review the learning point.

Question 21 of 40 · Virchow triad

Q21. Which option correctly lists Virchow’s triad of thrombus formation?

A. Stasis, endothelial injury and hypercoagulabilityB. Infection, fever and painC. Hypothermia, bradycardia and anaemiaD. Hypertension, diabetes and smokingE. Thrombocytopenia, dehydration and jaundice

View detailed explanation, examiner trap and viva

Correct answer: A. Stasis, endothelial injury and hypercoagulability

Why correct: Correct: stasis, endothelial injury and hypercoagulability describe the three broad prothrombotic mechanisms.

Why the other options are incorrect:

B. Infection, fever and pain: These can occur in surgical patients but are not the classical triad.

C. Hypothermia, bradycardia and anaemia: These are not Virchow’s three mechanisms.

D. Hypertension, diabetes and smoking: These are risk factors rather than the triad itself.

E. Thrombocytopenia, dehydration and jaundice: This set is not the triad.

Exam pearl: VTE prevention addresses more than immobility alone.

Examiner trap: A patient can have VTE despite apparently normal coagulation tests.

Viva extension — How does mobilisation help? Reduces venous stasis.

Question 22 of 40 · VTE prophylaxis

Q22. A postoperative patient has active uncontrolled bleeding but also high VTE risk. What is the most appropriate general principle?

A. Give therapeutic anticoagulation to everyone immediatelyB. Balance bleeding and thrombosis risks; use appropriate mechanical measures where indicatedC. Never reassess prophylaxis once admission assessment is doneD. Discontinue all mobilizationE. Prescribe the same anticoagulant regardless of renal function

View detailed explanation, examiner trap and viva

Correct answer: B. Balance bleeding and thrombosis risks; use appropriate mechanical measures where indicated

Why correct: Correct: reassess dynamically and use suitable prophylaxis according to bleeding risk and procedure.

Why the other options are incorrect:

A. Give therapeutic anticoagulation to everyone immediately: Active bleeding is a major contraindication to routine immediate anticoagulation.

C. Never reassess prophylaxis once admission assessment is done: Risk status can change rapidly after surgery.

D. Discontinue all mobilization: Avoiding mobilisation may increase stasis.

E. Prescribe the same anticoagulant regardless of renal function: Renal function and procedure are relevant to drug choice.

Exam pearl: VTE risk and bleeding risk must both be documented.

Examiner trap: Prophylaxis is not identical to full-dose anticoagulation.

Viva extension — When should prophylaxis be re-evaluated? When bleeding status, mobility or other risk factors change.

Question 23 of 40 · Pulmonary embolism

Q23. A day-five postoperative patient suddenly develops dyspnoea, pleuritic chest pain and tachycardia. What serious diagnosis must be considered?

A. Simple wound bruisingB. Vitamin B12 deficiencyC. Pulmonary embolismD. Chronic constipationE. Postoperative keloid formation

View detailed explanation, examiner trap and viva

Correct answer: C. Pulmonary embolism

Why correct: Correct: PE is an important time-critical possibility after surgery and immobility.

Why the other options are incorrect:

A. Simple wound bruising: Wound bruising does not explain abrupt cardiopulmonary features.

B. Vitamin B12 deficiency: B12 deficiency does not cause acute pleuritic dyspnoea.

D. Chronic constipation: Constipation does not fit the acute pulmonary syndrome.

E. Postoperative keloid formation: A keloid is delayed abnormal scarring.

Exam pearl: Consider PE in acute unexplained postoperative respiratory symptoms.

Examiner trap: PE is not the only cause—evaluate ABCs and alternative diagnoses.

Viva extension — How does instability change management? It prioritises emergency resuscitation and urgent specialist decisions.

Question 24 of 40 · Postoperative fever

Q24. A patient has a low fever on the first evening after surgery but is otherwise stable. What is the soundest initial clinical approach?

A. Assume pneumonia and start antibiotics immediatelyB. Disregard all fever measurementsC. Obtain contrast CT in every patientD. Perform a focused clinical assessment and assess for concerning featuresE. Diagnose a deep SSI solely from the temperature

View detailed explanation, examiner trap and viva

Correct answer: D. Perform a focused clinical assessment and assess for concerning features

Why correct: Correct: integrate vital signs, symptoms, procedure, wound findings and risk before testing or treatment.

Why the other options are incorrect:

A. Assume pneumonia and start antibiotics immediately: Fever does not specify an infectious source.

B. Disregard all fever measurements: A deteriorating patient must not be ignored.

C. Obtain contrast CT in every patient: Routine CT without clinical indication is inappropriate.

E. Diagnose a deep SSI solely from the temperature: Deep SSI cannot be diagnosed from temperature alone.

Exam pearl: A postoperative fever needs context, not an automatic antibiotic order.

Examiner trap: Traditional day-specific fever mnemonics are oversimplified.

Viva extension — Which red flags change urgency? Hypotension, confusion, hypoxia or evolving organ dysfunction.

Question 25 of 40 · Wound dehiscence

Q25. After coughing, a patient’s laparotomy wound opens and bowel is visible. What should be done immediately?

A. Push bowel back without analgesia or assessmentB. Apply a dry tight bandage directly over exposed bowelC. Offer discharge advice for review tomorrowD. Start oral laxatives and observeE. Cover the bowel with sterile saline-moistened dressing and obtain urgent surgical help

View detailed explanation, examiner trap and viva

Correct answer: E. Cover the bowel with sterile saline-moistened dressing and obtain urgent surgical help

Why correct: Correct: protect exposed viscera, resuscitate/monitor and arrange urgent operative evaluation.

Why the other options are incorrect:

A. Push bowel back without analgesia or assessment: Forceful ward reduction risks injury and delays definitive care.

B. Apply a dry tight bandage directly over exposed bowel: A dry tight dressing can injure exposed bowel.

C. Offer discharge advice for review tomorrow: Evisceration requires urgent assessment.

D. Start oral laxatives and observe: Laxatives do not address fascial failure.

Exam pearl: Evisceration is a surgical emergency.

Examiner trap: Do not confuse superficial skin separation with complete fascial dehiscence.

Viva extension — What dressing is preferred initially? Sterile saline-moistened covering.

Question 26 of 40 · SSI classification

Q26. A postoperative wound infection extends through fascia into skeletal muscle but there is no intra-abdominal collection. What classification best fits?

A. Deep incisional SSIB. Superficial incisional SSIC. Organ-space SSID. Simple colonisationE. Uninfected seroma

View detailed explanation, examiner trap and viva

Correct answer: A. Deep incisional SSI

Why correct: Correct: fascia and muscle involvement is deep incisional infection.

Why the other options are incorrect:

B. Superficial incisional SSI: Superficial SSI is confined to skin/subcutaneous tissue.

C. Organ-space SSI: Organ-space SSI involves an internal space manipulated or opened during the operation.

D. Simple colonisation: Colonisation alone does not establish invasive infection.

E. Uninfected seroma: A sterile seroma lacks infection.

Exam pearl: Fascia/muscle = deep incisional SSI.

Examiner trap: Distinguish deep incisional from organ-space infection anatomically.

Viva extension — What counts as superficial SSI? Skin and subcutaneous layers.

Question 27 of 40 · Surgical prophylaxis

Q27. An indicated prophylactic IV antibiotic is administered in relation to a clean-contaminated elective operation. What is the main objective?

A. Treat an unrecognised established abscess for 10 daysB. Achieve adequate antimicrobial tissue concentration at the time of incisionC. Sterilise every surface in theatreD. Replace aseptic operative techniqueE. Eliminate the need for source control if infection occurs

View detailed explanation, examiner trap and viva

Correct answer: B. Achieve adequate antimicrobial tissue concentration at the time of incision

Why correct: Correct: tissue drug exposure at incision is a key prophylactic goal; precise timing depends on agent/protocol.

Why the other options are incorrect:

A. Treat an unrecognised established abscess for 10 days: Prophylaxis is not prolonged treatment for an established infection.

C. Sterilise every surface in theatre: Antibiotics do not sterilise the whole theatre environment.

D. Replace aseptic operative technique: Asepsis remains essential.

E. Eliminate the need for source control if infection occurs: Abscesses and source-control problems still require appropriate management.

Exam pearl: Prophylaxis and treatment have different goals.

Examiner trap: More postoperative doses are not automatically better.

Viva extension — What else determines antibiotic choice? Procedure, expected organisms, allergies and local resistance guidance.

Question 28 of 40 · Sepsis detection

Q28. A postoperative patient develops confusion, hypotension and new oliguria with suspected intra-abdominal infection. What is the best immediate clinical priority?

A. Wait for a positive wound swab before actingB. Treat the temperature alone with paracetamolC. Urgent ABC assessment, resuscitation, appropriate antimicrobials and source-control assessmentD. Plan routine outpatient reviewE. Give an antidiarrhoeal as first-line therapy

View detailed explanation, examiner trap and viva

Correct answer: C. Urgent ABC assessment, resuscitation, appropriate antimicrobials and source-control assessment

Why correct: Correct: identify sepsis/organ dysfunction and act promptly with simultaneous assessment and intervention.

Why the other options are incorrect:

A. Wait for a positive wound swab before acting: High-risk deterioration cannot wait for a wound swab.

B. Treat the temperature alone with paracetamol: Antipyresis does not treat circulatory failure or infection source.

D. Plan routine outpatient review: The patient needs immediate inpatient care.

E. Give an antidiarrhoeal as first-line therapy: Antidiarrhoeals do not address the acute syndrome.

Exam pearl: Sepsis care includes early source control when indicated.

Examiner trap: Cultures are valuable but must not delay time-critical treatment.

Viva extension — What tests help track perfusion? Lactate trend, renal function and urine output in context.

Question 29 of 40 · Catheter obstruction

Q29. A previously stable postoperative patient has zero urine recorded for three hours, normal blood pressure and suprapubic fullness. What should be checked promptly?

A. Oxygen concentration of room airB. Serum calcium onlyC. Calf circumferenceD. Urinary catheter tubing and drainage patencyE. Myocardial enzyme level only

View detailed explanation, examiner trap and viva

Correct answer: D. Urinary catheter tubing and drainage patency

Why correct: Correct: mechanical blockage, kinking or displacement may explain absent drainage.

Why the other options are incorrect:

A. Oxygen concentration of room air: Ambient oxygen is irrelevant to the immediate retention clues.

B. Serum calcium only: Calcium alone is not the first priority.

C. Calf circumference: DVT screening is not the best response to suprapubic distension and absent catheter output.

E. Myocardial enzyme level only: Troponin does not address urinary retention.

Exam pearl: Oliguria with a catheter may be mechanical.

Examiner trap: Do not label AKI before checking drainage and perfusion.

Viva extension — What else should be assessed? Bladder scan if available and examination.

Question 30 of 40 · Postoperative AKI

Q30. A patient’s creatinine rises over the first two days after severe hypotension and nephrotoxic medication exposure. Which concept is most relevant?

A. Creatinine always rises immediately within minutes of injuryB. Normal urine colour excludes AKIC. The injury must be postrenal obstructionD. The only management is to increase fluid regardless of overloadE. AKI may arise from renal hypoperfusion and drug-related injury

View detailed explanation, examiner trap and viva

Correct answer: E. AKI may arise from renal hypoperfusion and drug-related injury

Why correct: Correct: both haemodynamic compromise and nephrotoxic exposure are important AKI contributors.

Why the other options are incorrect:

A. Creatinine always rises immediately within minutes of injury: Creatinine may lag behind the insult.

B. Normal urine colour excludes AKI: Urine colour cannot rule out AKI.

C. The injury must be postrenal obstruction: Obstruction is one cause, not inevitable.

D. The only management is to increase fluid regardless of overload: Fluids must be individualised to haemodynamic state and congestion.

Exam pearl: AKI requires cause assessment and medication review.

Examiner trap: A normal initial creatinine does not exclude early injury.

Viva extension — What other AKI classification exists? Prerenal, intrinsic and postrenal mechanisms.

Question 31 of 40 · Transfusion reaction

Q31. Ten minutes after starting a red-cell transfusion, a patient develops fever, flank pain, hypotension and dark urine. Which is most concerning?

A. Acute haemolytic transfusion reactionB. Routine postoperative fatigueC. Early ileusD. Opioid-associated nauseaE. Low serum magnesium

View detailed explanation, examiner trap and viva

Correct answer: A. Acute haemolytic transfusion reaction

Why correct: Correct: acute haemolytic reaction requires stopping transfusion and emergency evaluation.

Why the other options are incorrect:

B. Routine postoperative fatigue: Fatigue does not explain collapse during transfusion.

C. Early ileus: Ileus does not cause acute haemoglobinuria immediately after transfusion.

D. Opioid-associated nausea: Opioid nausea alone lacks the haemolysis features.

E. Low serum magnesium: Hypomagnesaemia is not the main syndrome.

Exam pearl: Stop transfusion if a serious reaction is suspected.

Examiner trap: Fever during transfusion is not always a benign febrile reaction.

Viva extension — What immediate actions? Stop transfusion, maintain IV access and notify transfusion service.

Question 32 of 40 · Malignant hyperthermia

Q32. During a volatile-anaesthetic general anaesthetic, a patient develops rising end-tidal CO2, muscle rigidity and hyperthermia. Which intervention is specific for the suspected syndrome?

A. Continue the triggering agentB. Stop triggers and administer dantrolene per emergency protocolC. Give oral antibiotics onlyD. Administer naloxone as sole treatmentE. Use fluid restriction to control temperature

View detailed explanation, examiner trap and viva

Correct answer: B. Stop triggers and administer dantrolene per emergency protocol

Why correct: Correct: remove triggers, call for help, give dantrolene and support oxygenation/temperature and metabolic disturbances.

Why the other options are incorrect:

A. Continue the triggering agent: Continuing triggers aggravates malignant hyperthermia.

C. Give oral antibiotics only: This is not a bacterial fever syndrome.

D. Administer naloxone as sole treatment: Naloxone reverses opioids, not ryanodine-receptor calcium dysregulation.

E. Use fluid restriction to control temperature: Care requires active crisis management, not routine restriction.

Exam pearl: Rising ETCO2 is an early malignant-hyperthermia clue.

Examiner trap: Hyperthermia may occur later; do not wait for extreme temperature.

Viva extension — What is the key drug? Dantrolene.

Question 33 of 40 · Anaphylaxis

Q33. Immediately following administration of a perioperative drug, a patient develops bronchospasm, rash and profound hypotension. What is the principal emergency medication?

A. Oral antihistamine aloneB. FurosemideC. Adrenaline with ABC resuscitationD. Topical corticosteroidE. Oral calcium

View detailed explanation, examiner trap and viva

Correct answer: C. Adrenaline with ABC resuscitation

Why correct: Correct: adrenaline is central to anaphylaxis resuscitation alongside oxygen, fluids and expert help.

Why the other options are incorrect:

A. Oral antihistamine alone: Antihistamines do not reverse shock or airway compromise.

B. Furosemide: Diuresis may worsen hypotension.

D. Topical corticosteroid: Topical steroid has no useful immediate shock effect.

E. Oral calcium: Calcium does not treat this anaphylaxis syndrome.

Exam pearl: Anaphylaxis is a clinical emergency; treat before laboratory confirmation.

Examiner trap: Skin changes may be absent in severe reactions.

Viva extension — What key physiology does adrenaline address? Vasodilatation, bronchospasm and cardiovascular collapse.

Question 34 of 40 · Low oxygen after surgery

Q34. A drowsy postoperative patient is desaturating on the ward with noisy upper airway breathing. What is the immediate first step?

A. Order a routine outpatient sleep studyB. Give laxativesC. Wait for a chest radiograph without touching the patientD. Assess and support the airway and breathing immediatelyE. Give oral iron

View detailed explanation, examiner trap and viva

Correct answer: D. Assess and support the airway and breathing immediately

Why correct: Correct: airway patency and breathing support take priority during acute hypoxia.

Why the other options are incorrect:

A. Order a routine outpatient sleep study: A sleep study is not acute resuscitation.

B. Give laxatives: Laxatives do not correct airway obstruction.

C. Wait for a chest radiograph without touching the patient: Investigations must not delay airway support.

E. Give oral iron: Iron does not treat airway compromise.

Exam pearl: ABCs precede diagnostic labels.

Examiner trap: A saturating patient on oxygen may still hypoventilate.

Viva extension — What should you evaluate? Responsiveness, airway obstruction, ventilation and oxygenation.

Question 35 of 40 · Anastomotic leak

Q35. Four days after colorectal surgery, a patient develops persistent tachycardia, new abdominal pain, fever and rising inflammatory markers. What complication needs urgent evaluation?

A. Expected normal scar remodellingB. Uncomplicated constipation onlyC. Primary gout attackD. Uncomplicated minor PONVE. Anastomotic leak with intra-abdominal sepsis

View detailed explanation, examiner trap and viva

Correct answer: E. Anastomotic leak with intra-abdominal sepsis

Why correct: Correct: systemic deterioration and abdominal findings after anastomosis warrant urgent assessment for leak and source control.

Why the other options are incorrect:

A. Expected normal scar remodelling: Scar maturation does not explain acute sepsis signs.

B. Uncomplicated constipation only: Constipation alone should not explain the total syndrome.

C. Primary gout attack: Gout does not fit abdominal postoperative sepsis.

D. Uncomplicated minor PONV: Simple PONV lacks persistent systemic deterioration.

Exam pearl: Persistent postoperative tachycardia is an important warning sign.

Examiner trap: Do not attribute every fever to atelectasis.

Viva extension — Which management principle matters? Stabilise and investigate urgently; drain or operate if indicated.

Question 36 of 40 · Hypothermia

Q36. A patient is cold in recovery after prolonged surgery. Why is active temperature management important?

A. Hypothermia can contribute to coagulopathy and impaired recoveryB. It eliminates all postoperative nauseaC. It makes anticoagulation unnecessaryD. It prevents every surgical infectionE. It eliminates any need for oxygen monitoring

View detailed explanation, examiner trap and viva

Correct answer: A. Hypothermia can contribute to coagulopathy and impaired recovery

Why correct: Correct: unwanted perioperative hypothermia may worsen haemostasis and patient outcomes.

Why the other options are incorrect:

B. It eliminates all postoperative nausea: Nausea has multiple causes.

C. It makes anticoagulation unnecessary: VTE decisions remain independent.

D. It prevents every surgical infection: Infection risks are multifactorial; temperature management reduces some risks but not all.

E. It eliminates any need for oxygen monitoring: Airway/oxygen monitoring is still essential.

Exam pearl: Maintain normothermia as part of safe perioperative care.

Examiner trap: Shivering is not the only consequence of hypothermia.

Viva extension — How is warming achieved? Appropriate active/passive warming and warmed fluids when indicated.

Question 37 of 40 · Delirium

Q37. An older patient becomes acutely confused with fluctuating attention after surgery. What diagnosis is most likely?

A. Major neurocognitive disorder established by one overnight changeB. Postoperative deliriumC. Chronic depression aloneD. Normal ageingE. Uncomplicated muscular pain

View detailed explanation, examiner trap and viva

Correct answer: B. Postoperative delirium

Why correct: Correct: acute onset and fluctuating inattention are classic delirium features.

Why the other options are incorrect:

A. Major neurocognitive disorder established by one overnight change: Dementia typically has a chronic course, though it increases delirium risk.

C. Chronic depression alone: Depression does not typically produce abrupt fluctuation in arousal and attention.

D. Normal ageing: Acute confusion is not simply normal ageing.

E. Uncomplicated muscular pain: Pain may contribute but does not define this syndrome.

Exam pearl: Search for reversible delirium precipitants.

Examiner trap: Do not assume postoperative confusion is dementia.

Viva extension — Name triggers. Infection, hypoxia, dehydration, medications and urinary retention.? Review the learning point.

Question 38 of 40 · Postoperative hypoglycaemia

Q38. A postoperative patient treated with insulin becomes sweaty, confused and tremulous; bedside glucose is low. What is the priority?

A. Give extra rapid-acting insulinB. Delay intervention pending laboratory confirmationC. Prompt treatment of hypoglycaemia using local protocol with reassessmentD. Begin prophylactic anticoagulationE. Start empirical broad-spectrum antibiotics as the sole action

View detailed explanation, examiner trap and viva

Correct answer: C. Prompt treatment of hypoglycaemia using local protocol with reassessment

Why correct: Correct: restore glucose safely using the appropriate oral or IV route and recheck.

Why the other options are incorrect:

A. Give extra rapid-acting insulin: Extra insulin would worsen glucose deficiency.

B. Delay intervention pending laboratory confirmation: Point-of-care hypoglycaemia plus symptoms warrants urgent action.

D. Begin prophylactic anticoagulation: Anticoagulation does not treat hypoglycaemia.

E. Start empirical broad-spectrum antibiotics as the sole action: Antibiotics do not directly correct glucose deficiency.

Exam pearl: Always check bedside glucose in acute confusion.

Examiner trap: A patient unable to swallow safely should not receive oral treatment.

Viva extension — What follow-up is necessary? Repeat glucose and review medication/food balance.

Question 39 of 40 · Pain control

Q39. Which approach best represents multimodal postoperative analgesia?

A. Give only repeated opioids regardless of adverse effectsB. Avoid all non-opioid options in every patientC. Administer NSAIDs even with contraindicationsD. Combine appropriate analgesics with different mechanisms and reassessE. Withhold pain control until discharge

View detailed explanation, examiner trap and viva

Correct answer: D. Combine appropriate analgesics with different mechanisms and reassess

Why correct: Correct: combine complementary modalities tailored to pain severity, procedure and patient risk.

Why the other options are incorrect:

A. Give only repeated opioids regardless of adverse effects: Opioid-only strategies can increase sedation, ileus and nausea.

B. Avoid all non-opioid options in every patient: Non-opioid options have an important role when appropriate.

C. Administer NSAIDs even with contraindications: Contraindications must be respected.

E. Withhold pain control until discharge: Untreated pain impedes respiration and mobilisation.

Exam pearl: Multimodal analgesia aims for effective pain relief with fewer adverse effects.

Examiner trap: Not every patient is suitable for NSAIDs.

Viva extension — What opioid adverse effects matter? Respiratory depression, constipation, nausea and sedation.

Question 40 of 40 · Neuraxial contraindications

Q40. An elective patient is receiving therapeutic anticoagulation and is being considered for a neuraxial block. What is the safest principle?

A. Neuraxial bleeding is never clinically significantB. Ignore last drug administration timeC. All agents have identical interruption intervalsD. Therapeutic anticoagulation automatically makes every other anaesthetic option safeE. Review anticoagulant and timing against current neuraxial safety guidance before proceeding

View detailed explanation, examiner trap and viva

Correct answer: E. Review anticoagulant and timing against current neuraxial safety guidance before proceeding

Why correct: Correct: evaluate drug, dose, kidney function, timing and local expert neuraxial guidelines because spinal haematoma can be catastrophic.

Why the other options are incorrect:

A. Neuraxial bleeding is never clinically significant: Neuraxial haematoma may cause severe neurological injury.

B. Ignore last drug administration time: Drug timing is central to safety.

C. All agents have identical interruption intervals: Interruption intervals differ among agents and clinical contexts.

D. Therapeutic anticoagulation automatically makes every other anaesthetic option safe: Other approaches also have risks requiring assessment.

Exam pearl: Neuraxial safety is anticoagulant-specific.

Examiner trap: Do not memorise a universal interval for all anticoagulants.

Viva extension — What potential complication is feared? Spinal/epidural haematoma and neurological compression.

Frequently asked questions

Are these actual past MRCS questions?

No. All 40 SBAs are newly written educational questions informed by the public MRCS syllabus and recurring clinical learning objectives.

Should every patient undergo the same preoperative tests?

No. Investigations depend on comorbidity, history, examination, surgery and current guidance.

Does fasting eliminate aspiration risk?

No. Delayed gastric emptying, obstruction and other clinical factors can leave a full stomach despite fasting.

Why does a spinal block sometimes lower blood pressure?

Sympathetic blockade causes peripheral vasodilatation and reduced venous return.

When should a postoperative patient trigger urgent escalation?

New hypotension, hypoxia, reduced consciousness, severe bleeding, sustained tachycardia, severe pain with deterioration or evidence of organ dysfunction warrants immediate clinical assessment.

How are fluid resuscitation and maintenance different?

Resuscitation aims to restore perfusion in acute volume problems; maintenance replaces expected daily needs in patients unable to meet them orally.

Will the quiz remember my progress?

Yes, when browser storage is permitted. Progress is local to this device and browser, not an account and not synced across devices.

Official references and related MRCS lessons

Educational content only. Use current local anaesthesia, perioperative, VTE and sepsis protocols and individual assessment for patient care. References below are official or recognised guidance, not sources for actual exam recalls.

1. Intercollegiate MRCS candidate guidance
2. NICE NG180: Perioperative care in adults
3. NICE NG45: Routine preoperative tests for elective surgery
4. NICE CG174: Intravenous fluid therapy in adults in hospital
5. NICE NG89: VTE risk reduction in over 16s
6. NICE NG125: Surgical site infections
7. WHO surgical safety checklist implementation manual

Published MRCS Academy lessons

Article 01
Start MRCS HereArticle 02
Complete SyllabusArticle 03
Books and ResourcesArticle 04
12-Week Study PlanArticle 05
SBA Question StrategyArticle 06
Common Preparation MistakesArticle 07
Surgical Anatomy OverviewArticle 08
Upper Limb AnatomyArticle 09
Inguinal & Abdominal WallArticle 10
Head & Neck Surgical AnatomyArticle 11
Cardiovascular & Respiratory PhysiologyArticle 12
Renal & Acid–Base PhysiologyArticle 13
GI, Endocrine & NeurophysiologyArticle 14
Lower Limb Surgical Anatomy Made Easy for MRCS Part AArticle 15
Thoracic, Pelvic and Visceral Surgical AnatomyArticle 16
Surgical Pathology, Inflammation and Wound Healing Made Easy for MRCS Part AArticle 17
Surgical Pharmacology and Microbiology Made Easy for MRCS Part A

Previous lesson: Article 17 — Surgical Pharmacology and Microbiology

Next planned: Article 19 — Trauma, Shock and Burns. Add its link only after publication.

FreeMedSite MRCS independent educational content · Editorial update: 16 October 2026