After sitting Part I myself and working with residents preparing for it, a pattern becomes very clear. Three areas appear with enough consistency that you can bank on being tested on them in some form in almost every sitting.
None of these are obscure or unusual topics. But candidates routinely lose marks on them because they learn them superficially. The examiner is not asking for a definition. They are asking for the clinical implication, the exception, or the management decision that follows from the physiology. That is the gap that costs people marks.
1. Pharmacokinetics of volatile anaesthetic agents
This comes up constantly, and it comes up in many forms. The straightforward version asks you to explain uptake and distribution. The harder version asks why a patient with low cardiac output reaches equilibrium faster, or why nitrous oxide speeds up induction when used alongside a volatile agent.
The concepts you need to own completely are: the blood-gas partition coefficient, the oil-gas partition coefficient, the effect of cardiac output on speed of induction, the concentration effect, and the second gas effect. Do not memorise numbers in isolation. Understand why each relationship exists so that you can answer any variation of the question.
2. Mechanism and reversal of neuromuscular blockade
This is tested at every level of depth, from basic receptor pharmacology to the clinical decision about when it is safe to extubate. The examiner will often push from mechanism toward clinical management, particularly around monitoring and reversal agents.
You need to be clear on the difference between depolarising and non-depolarising block, how each can be monitored with a peripheral nerve stimulator, the train-of-four ratio and what it tells you, and the mechanism and appropriate use of sugammadex versus neostigmine. Residual neuromuscular blockade and its consequences in the post-operative period is a high-yield area that bridges pharmacology and patient safety.
3. Physiology of spinal anaesthesia
The cardiovascular effects of spinal anaesthesia are frequently examined because the physiology is layered and the clinical implications are directly testable. Start with the mechanism of sympathetic blockade and trace the consequences through: vasodilation, reduced venous return, fall in cardiac output, and the compensatory responses above the block level.
Determinants of block height are equally important. Baricity and posture are the most controllable factors and the most likely to be asked about. Understanding why a hyperbaric solution behaves differently from a hypobaric or isobaric solution, and how patient position during and after injection affects the final block level, gives you enough to handle any question on this topic.
How to prepare
For each of these three areas, read through the core concept once from a reliable source, then close the book and write out the key points from memory. Then generate your own questions from the material. The kind that start with “what happens if” or “why would” rather than “what is.” Those are the questions the examiner is actually going to ask.