A Timetable Between 30-180 seconds of oxygen deprivation, you may lose consciousness. Brain cells begin to die after one minute. At three minutes, neurons are more severely damaged, and long-term brain damage is more likely. Most people who suffer from oxygen deprivation will recover fully, but some may have long-term problems with memory, thinking, and behavior.
After five minutes, most people cannot recover from oxygen deprivation. Those that do recover often experience long-term effects on their mental abilities.
The human body can survive for several hours without oxygen. The brain and the heart are the first organs to run out of steam. You lose consciousness after your blood oxygen level drops to about 95 percent, so you should always try to breathe properly when diving or otherwise exposed to high pressure environments where breathing might be difficult.
If you think that you may have suffered an injury that has rendered you unconscious, it is important to seek medical help as soon as possible. The longer that you go without oxygen, the greater the chance of permanent brain damage occurring.
When a person is unconscious and not breathing, time is critical. Without oxygen, permanent brain damage occurs after only 4 minutes, and death can occur as quickly as 4 to 6 minutes later. After that, it's all downhill.
The human body is designed for survival not for comfort. If you don't get enough air, your body will react by trying to breathe harder, which can cause you pain. Also, your blood pH will begin to drop because you are losing the acid-base balance of your body. This is very dangerous since your nerves are also affected when your blood pH drops below 7.3.
Once you have stopped breathing, you need artificial support to survive. There are two ways of doing this: either with a machine or simply allowing your body to recover its ability to breathe on its own.
People who use ventilators can live for many years thanks to regular upgrades of the equipment. A patient who uses a ventilator must stay in hospital though, so this method isn't available for everyone.
Those who die despite using ventilators often do so because they were unable to be weaned off them. This means they were still needing help breathing at the end of their lives, even though they were alive with people around them who knew what was going on.
However, most of these events take place well before the help arrives, so it is possible to recover significantly delayed outcomes.
The ability of the human body to recover from severe injuries has been well documented for centuries. Some people claim that they can jump off a building or drive a car crash but many experts say this is not true. The brain is a very important part of our body and it is very sensitive to injury. It is normal for some brain activity to continue even when we are unconscious, this is called "silent brain activity". Too much or too little of this activity may be a sign of a problem that needs medical attention.
When you suffer an injury that causes loss of blood flow to parts of your brain, such as during a stroke or heart attack, there is a risk that you will never regain full use of your limbs or other aspects of your intelligence. However, with early detection and immediate treatment, many people do make a good recovery. Doctors use tests to see how well children's brains are working after such injuries so they can provide the best chance of recovery.
Even if you are evacuated from a low-oxygen environment, your body may continue to suffer as a result of the harm done. You will lose consciousness for the first 30 to 180 seconds. After that, your body will start to recover but some things can go wrong with your brain or other organs. They won't fully recover because there is no way to repair them once they have been damaged.
People who are deprived of oxygen for longer than four minutes can suffer permanent brain damage. If you are not breathing properly because you are unconscious, help will be coming soon. The people around you should shout "Hey! Hey!" and perform chest compressions until help arrives.
The more people that can be called and the closer they are to you, the better your chances of survival. Always try and stay in air-conditioned or refrigerated places. Dress appropriately for the weather outside. Avoid alcohol and drugs. These things impair your judgment and reactions skills and make it harder for your body to fight off infection and disease.