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Doctor insights on: How Long Can A Brain Last Without Oxygen

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How long can the brain go without oxygen before damage occurs?

How long can the brain go without oxygen before damage occurs?

About 4 hours: From multiple studies with stroke, permanent brain damage occurs after three hours of interruption of blood supply. ...Read more

Dr. Scott Bolhack
3,074 doctors shared insights

Oxygen (Definition)

Oxygen is a gas that the cells in your body need to work properly. The air we breathe normally has 21% oxygen. A maximum of 100% oxygen can be given. Babies with heart or lung problems may need ...Read more


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How many minutes without oxygen does it take before a child suffers permanent brain damage?

How many minutes without oxygen does it take before a child suffers permanent brain damage?

Varies: Depends on whether the deprivation is complete or not. The brain uses 20% of oxygen with every breatn taken because it is the most metabolically tissue in the body.Complete deprivation will kill the lower part of the brain in seconds. ...Read more

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My niece was without oxygen for about 5 minutes was brought back but is now comatose for 13 days now she has brain damage and had EEG had 7 seizures?

My niece was without oxygen for about 5 minutes was brought back but is now comatose for 13 days now she has brain damage  and had EEG had 7 seizures?

Hypoxic encephal.: The hypoxia has likely resulted a secondary brain injury, and depending on age, the extent of recovery will be unknown for some time. The seizures are not unexpected and will need control, but likely not to be a long-term challenge. Have a neurology consult, provide supportive care, and hope for the best. ...Read more

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I'm considering climbing everest without oxygen, and training by sleeping and running in an altitude tent which will lower my blood 02 sat. Levels to ~70%. Can I do both without brain damage?

I'm considering climbing everest without oxygen, and training by sleeping and running in an altitude tent which will lower my blood 02 sat. Levels to ~70%. Can I do both without brain damage?

No guarantees.: People have different susceptibilities to hypoxia depending on many factors including age, physical fitness, and health status. Also, the ability of the brain to withstand hypoxia is time dependent, so time at the summit will be critical. ...Read more

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I have grand mal seizure whenever I get one it lasted between 5to10 min. Does not having oxygen to my brain for so long cause damage?

I have grand mal seizure whenever I get one it lasted between 5to10 min. Does not having oxygen to my brain for so long cause damage?

Hopefully not: Grand mal seizures that last over 20 min are seen as a risk for brain damage, but shorter ones are not considered to be a risk for that. Here's a link: However, it is still important that you work w/ your physician on achieving the best management you can. Talk with them about your concern and best treatment planning. I hope it goes well. ...Read more

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How long can person survive without oxygen?

How long can  person survive without oxygen?

O2: Difficult to predict. Lack of oxygen for more than four minutes will result in anoxic damage to the brain. The person without oxygen, may not survive more than a few hours to days. ...Read more

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Cariac arrest no pulse nothing brought back life support and took off and breathed on own 2 days. How long was she without oxygen 4 her to live 2 day?

Cariac arrest no pulse nothing brought back life support and took off and breathed on own 2 days. How long was she without oxygen 4  her to live 2 day?

So sorry: Sorry to hear of this devastation.Cant tell exactly what's being asked, but will take a shot:there are many variables that go into how long a body can continue to function post cardiac arrest.The respiratory center is buried deep in midbrain,protected by the cerebral cortex. It can continue to function and effect respirations even after severe oxygen deprivation. Ive seen go for several days. ...Read more

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When someone cant breath do they pass out and then die or do they just die? How long can someone go without oxygen?

When someone cant breath do they pass out and then die or do they just die? How long can someone go without oxygen?

Thinking of suicide?: Are you thinking of hurting yourself? Please go to the ER right away, it is not worth hurting yourself, there is always a better solution ...Read more

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Does oxygen desaturation on a long-haul flight (13.5 hours) cause any sort of brain damage to a baby? I've read they go as low as 80% and lower.

Does oxygen desaturation on a long-haul flight (13.5 hours)  cause any sort of brain damage to a baby?  I've read they go as low as 80% and lower.

Odd comment: Babies with a normal lung structure will maintain normal oxygen levels on a long flight the same way any adult or older child would. There is no drop in the blood oxygen level during a flight. Pressurized air craft are a safe mode of travel for infants. Someone is providing you with goofy information. ...Read more

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Cerebrum (Definition)

Cerebrum essentially refers to the majority of the brain. Embryologically, it develops from the telencephalon, and together with the diencephalon, ...Read more