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low O2 Sat

my sat went to 40 due to an accidental drug overdose, I feel ok I was wondering what if anything happened to my brain.
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If you are coherent enough to tell us about all this I would say that there was little to no damage.  It depends upon how long the brain went without oxygen.  The rule of thumb is this.  Every minute that goes by you are without oxygen the is a 10% loss of life.  Brain damage starts to happen at between 3-4 minutes.  
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144586 tn?1284666164
Possibly. Not necessarily  In general, it depends upon the duration of the oxygen deprivation, but that is subject to caveats. In the case of an opiate overdose, the body is essentially unconscious and oxygen demands of the extremities are diminished.

Sometimes an MRI/MRA will show the electronic signature of an area of dead tissue,
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