Question 1

A 50 kg man is anaesthetized with 150 mg propofol and 100 μg fentanyl. His BP has fallen to 75/40 mmHg. There is no rash or evidence of bronchospasm and his heart rate is 55 bpm.

What is the most likely cause?

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A. Incorrect. There is no evidence of anaphylaxis.

B. Correct. 3 mg/kg propofol has been used while the dose is 1-2 mg/kg. Hypotension is a predictable side effect at this dose.

C. Incorrect. The BP cuff size should be 'small adult' based on a weight of 50 kg, but even a large cuff is not likely to under-read by this extent.

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