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Anaesthesia · Airway management
Sample itemWhat is the purpose of preoxygenation before induction?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
B. Increase oxygen reserve during apnea
Preoxygenation replaces alveolar nitrogen with oxygen, extending the time before desaturation if apnea occurs during airway management.
Option by option
A. Prevent all hypotension
It does not prevent every blood-pressure drop.
B. Increase oxygen reserve during apnea (correct)
Correct: it increases safe apnea time by building oxygen reserve.
C. Replace capnography
Capnography remains essential for ventilation monitoring.
D. Cause muscle relaxation
Muscle relaxation requires specific drugs.
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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