First Aid & CPR Practice · Question
The brain begins to suffer permanent damage after how long without oxygen?
Irreversible brain damage starts after 4–6 minutes without oxygen — the reason CPR matters.
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Question: The brain begins to suffer permanent damage after how long without oxygen?
Answer options:
- About 1 minute ✅ About 4–6 minutes
- About 20 minutes
- About 1 hour
Correct answer: About 4–6 minutes
Explanation: Irreversible brain damage starts after 4–6 minutes without oxygen — the reason CPR matters.
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