The examiner asks, “Would you use total intravenous anaesthesia or a volatile technique?” A long list of advantages and disadvantages can sound knowledgeable while leaving one question unanswered: what would you choose for this patient, and why?
To compare anaesthetic techniques in the Final FRCA structured oral examination (SOE), identify the patient and procedure factors that matter most, weigh the leading options against those factors, then state a preferred plan, its main trade-off and a contingency. The comparison should lead somewhere: to a decision that fits the case.
Start with the decision, not the catalogue
Open with a sentence that sets the frame: “For this patient and operation, I would compare these techniques mainly on the risk that matters most and the practical demands of the procedure.” Then name the two or three factors that will drive your choice. This tells the examiner you have heard the question and gives your answer a route.
Those factors must come from the stem. Depending on the case, they might include haemodynamic reserve, airway or ventilation needs, surgical position and access, postoperative analgesia, recovery priorities, patient preference, or a specific monitoring requirement. They are not a prompt to recite every consideration that could apply to any anaesthetic.
The Royal College of Anaesthetists’ Final SOE resources include example questions and videos showing pass and borderline performances. The College says the videos illustrate performance rather than provide model answers. Use them to notice how a candidate responds to the question and develops an answer; do not memorise a script. One published example includes a TIVA-versus-volatile comparison, making it a useful prompt to practise this method.
Compare the options against the same priorities
A comparison becomes clear when you use the same yardstick for both options. If postoperative nausea and vomiting (PONV) is the priority, say what each technique offers for that risk. If the operation requires a particular form of intraoperative monitoring, compare how each technique fits that requirement. Avoid switching between unrelated advantages simply because you can recall them.
Use paired reasoning: “A gives me this advantage in this case; B remains attractive for this reason, but that matters less here.” This is more persuasive than delivering two separate speeches. It also helps you rank points. One decisive factor deserves more attention than three minor conveniences.
Then make the choice explicit. “On balance, I would choose A because…” is stronger than “both are possible.” Your choice need not imply that the alternative is wrong. A good comparison can acknowledge that both techniques are acceptable while explaining why one better matches the stated priorities.
Finish the comparison with the cost of your preferred option and a contingency. The trade-off is not a ritual disclaimer: it shows that you understand what could make your plan less suitable. State what you would check, mitigate or reconsider if that concern became important.
This structure sits neatly within a broader Final FRCA SOE answer structure. It also helps prevent the unranked lists described in common Final FRCA SOE mistakes.
A worked exchange: TIVA or volatile maintenance?
Imagine a 62-year-old having elective lumbar decompression. The patient has previously had severe PONV. Both TIVA and volatile maintenance are available, intravenous access is reliable, and no specific intraoperative neuromonitoring is planned.
Examiner: “How would you compare TIVA with volatile maintenance?”
Candidate: “TIVA avoids volatile agents and is a reasonable choice to reduce baseline PONV risk, so the patient’s previous severe symptoms make it my preference. I would still plan risk-based multimodal PONV prophylaxis; TIVA does not remove the risk. Volatile maintenance remains a reasonable alternative when paired with appropriate prophylaxis. On balance, I would choose TIVA, provided I can ensure reliable infusion delivery. I would check the line and infusion setup, and use processed EEG monitoring if neuromuscular blockade is used. If I could not ensure reliable delivery, I would reconsider the balance rather than persist with TIVA automatically.”
A weaker answer might say that TIVA reduces PONV, volatile anaesthesia is familiar, and both are acceptable—then stop. That answer names features but does not rank them, connect them to the patient or choose a plan. The stronger answer does all three, while keeping the alternative in view.
Current consensus guidance treats propofol TIVA as a way to reduce baseline PONV risk. It also finds that TIVA alone has comparable PONV risk to volatile anaesthesia paired with a 5-HT3 receptor antagonist or droperidol. The point in the SOE is not to declare a universal winner. It is to show why one option fits this stem better.
When the examiner changes one detail
Examiner: “The surgeon now plans motor-evoked-potential monitoring.”
Candidate: “That strengthens my preference for TIVA. A propofol-opioid intravenous technique is generally preferred for muscle motor-evoked-potential monitoring. I would agree a stable plan with the surgical and neurophysiology teams, while keeping reliable infusion delivery in view. If that could not be assured, I would discuss the practical constraint and reassess the plan rather than ignore it.”
Notice what changed: the candidate did not restart the answer or defend the original choice by repetition. A new factor altered the weighting, so the reason for the preference was updated. The same approach works if a detail weakens your initial choice: name what changed, say how it affects the comparison, and revise the decision when the balance has genuinely shifted.
This is where an unranked pros-and-cons list becomes especially fragile. Once the examiner adds information, the list grows, but the answer still has no centre. A prioritised comparison can absorb new facts because each new detail has a clear place: does it alter the main criterion, add a new one, or change the trade-off?
Keep the answer concise without making it thin
A useful spoken answer usually needs only a few well-chosen contrasts. If you find yourself listing every possible benefit of each technique, pause and return to the question: which difference matters most here? The language of prioritisation in oral stations can help you make that ranking audible.
Practise the sequence aloud on a familiar comparison: state the deciding factors, compare the options against them, choose, name the trade-off and explain when you would reconsider. Then ask a colleague to change one fact in the stem. Your task is not to protect your first answer; it is to show that your decision responds to the patient in front of you.
A strong comparison ends with a choice the examiner can follow—and a clear reason you would change it.
