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I read that when suffering from cardiac arrest you pass out after about a couple of seconds and irrevocal damage starts to take place after about two minutes. (http://journalofethics.ama-assn.org/2009/08/cprl1-0908.html) So from that I'd infer that as long as one doesn't pass out, no brain damage is to be expected. But I'd like to verify this.

Can oxygen deprivation be neurologically harmful even before reaching a point of passing out?

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