Interestingly the “counting back from 10” comes from the days of using thiopental.
Thiopental works a bit quicker than propofol and will cause unconsciousness after only counting a few numbers.
Propofol doesn’t work as reliably quickly, and generally in elective surgery a lower dose is used so it takes a little longer.
This is why many anaesthetists don’t ask you to count back from 10 anymore. “Think of somewhere nice you’d rather be” is a bit more pleasant.
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