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Anaesthesia · Special populations and acute pain: curriculum recognition
Sample itemA patient-controlled pump delivers a fixed bolus of morphine whenever the button is pressed, but ignores further presses for the next several minutes. What is the purpose of this ignored period?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
A. To prevent another dose before the previous one has reached peak effect
The lockout interval is the time after a successful demand during which further presses deliver nothing. It allows each bolus to reach its peak effect before the next is given, so stacking of doses and overdose are avoided. The patient's own sedation then acts as an additional safeguard.
Option by option
A. To prevent another dose before the previous one has reached peak effect (correct)
Correct. The pause lets each bolus act before another can be taken.
B. To allow the nurse to override the patient's demands
The lockout is automatic and has nothing to do with nurse override.
C. To give a larger loading dose on the first press
A loading dose is a separate programmed setting given when the pump is started.
D. To supply a steady baseline level of analgesia between demands
A steady baseline supply is a background infusion, which the lockout does not provide.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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