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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
3,112 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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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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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. I've seen go for several days. ...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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How long does it take before brain damage occur from lack of oxygen to the brain?

How long does it take before brain damage occur from lack of oxygen to the brain?

4 minutes or more: In the event of a full blown cardiac arrest there can be brain damage in as little as 4 to 5 minutes without circulation at normal body temperature. If the body had been cooled by submersion in cold water it could be much longer. Less severe lack of oxygen will take longer to produce brain damage. ...Read more

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Would hyperbaric oxygen therapy be effective for brain damage linked to long-term solvent abuse?

Would hyperbaric oxygen therapy be effective for brain damage linked to long-term solvent abuse?

No. The FDA lists 14: Conditions for which the benefits of hyperbaric oxygen treatment outweigh its risks of painful & sometimes serious consequences. It is no help whatsoever for brain damage from any cause, ADHD, Autism. The FDA requests that you report any provider who claims that it is. See www. Fda. Gov/ForConsumers/ConsumerUpdates/ucm364687.htm ...Read more

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Can sleep myoclonus make your brain feel like it has a "beat" of its own? Feel pressure/not headache. I worry about prolonged lack of oxygen to brain?

Can sleep myoclonus make your brain feel like it has a "beat" of its own? Feel pressure/not headache. I worry about prolonged lack of oxygen to brain?

Sleep study???: Have you had a sleep study? A sleep study will help to define what is happening while you sleep as well as determine if your oxygen level is dropping while you sleep. Then, treatment can be prescribed depending on the findings. See your doctor so a sleep study can be arranged. ...Read more

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What's happens if brain does't get enough oxygen?

What's happens if brain does't get enough oxygen?

Encephalopathy: I have a patient with Hypoxic Encephalopathy after 25 minutes of CPR post heart attack! He has chronic Vegetative state, Aphasic, quadriplegic, peg tube fed with tracheotomy! ...Read more

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What happens when your brain doesn't get enough oxygen?

What happens when your brain doesn't get enough oxygen?

Brain injury: If the brain does not get enough oxygen, a lot of problems can occur, such as dizziness, memory loss, seizures, and unconsciousness. If the brain is deprived of oxygen for a prolonged period of time, permanent damage can occur and is called anoxic (or hypoxic) brain injury. Someone with this condition is usually very sick and may be in a coma. ...Read more

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Why does it feel like my brain isn't getting enough oxygen?

Why does it feel like my brain isn't getting enough oxygen?

I do not know: But the good news is you have enough to be able to formulate thoughts and type this question, so it can't be something too serious. See a dr. For an evaluation and let them know your issues. Good luck to you. ...Read more

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I heard depriving your brain of oxygen gets you "high" but its only a few seconds am I correct?

I heard depriving your brain of oxygen gets you "high" but its only a few seconds am I correct?

No.: It may alter your sensation for a few seconds, but I would not say it makes you high. Kills a few brain cells along the way and depending upon the technique you use could result in permanent damage and death. ...Read more

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Brain had no oxygen - consequences, what to do?

Brain had no oxygen - consequences, what to do?

Anoxic Brain Injury: Both glucose and oxygen are needed for brain metabolism and the brain cannot tolerate being without oxygen more than 5 minutes. ...Read more

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What to do if I am feeling like there's no oxygen going to my brain?

What to do if I am feeling like there's no oxygen going to my brain?

See your doctor: If no oxygen was "going to my brain", you would not be capable of asking this question. See your physician and explore why you have this feeling. ...Read more

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What does brain needs (for example oxygen amount, vital nutrients.. ..)?

What does brain needs (for example oxygen amount, vital nutrients.. ..)?

All nutrients.: Your brain cells need whatever your other cells in your body need, only more often. One nutrient needed most is glucose, which is vital to correct brain function. That's why hypoglycemia is so very dangerous to the brain, as a drop in glucose can mean death of brain cells. Oxygen is also very important, and a lack of oxygen to the brain can cause massive brain cell death or a stroke. ...Read more

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Why do people yawn? I heard yawning is a sign that your brain isn't getting enough oxygen. Is this true?

Why do people yawn? I heard yawning is a sign that your brain isn't getting enough oxygen. Is this true?

True: Yawning is a sign of tiredness. Additionally, when your carbon dioxide (the gas given off with exhaling) level starts to rise in your body, it does stimulate the brain to cause you to yawn. The theory is that the yawning will cause you to take a deep breath and inhale more oxygen and exhale the excess carbon dioxide. ...Read more

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I don't breathe shallow or rapidly. And don't gasp for air...But I have white-outs and feel like brain/body isn't getting oxygen. What can cause this?

I don't breathe shallow or rapidly. And don't gasp for air...But I have white-outs and feel like brain/body isn't getting oxygen. What can cause this?

Tough to say: Without examining you fully and getting tests done, it is tough to say. You need to see a dr. For an eval as several issues including many metabolic issues (example: high or low blood sugar), neurological (example: seizure d/o), cardiac (example: arrhythmias, etc), are all possible...Best to get an eval. Good luck! ...Read more

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When the brain is deprived of oxygen for as little as 4 minutes, why do neurons die?

When the brain is deprived of oxygen for as little as 4 minutes, why do neurons die?

Check out this: Great article by Paul King, Computational Neuroscientist. Http://www. Huffingtonpost. Com/quora/why-do-neurons-die-so-qui_b_2920553.html ...Read more

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Could hyberbaric oxygen therapy help fix my brain?

Could hyberbaric oxygen therapy help fix my brain?

There are some: Specific indications for hyperbaric oxygen. There are clinics that give HBOT for conditions for which there is no good backing research. Please let us know what your condition is and will try to provide you with an accurate answer. ...Read more

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How does a lack of oxygen affect the brain?

How does a lack of oxygen affect the brain?

Cerebral anoxia: Confusion or loss of consciousness, dizziness, seizures, coma. Oxygen deprivation to the brain causes brain cells to die within minutes. ...Read more