What is the reason why ``revived even though death has been confirmed'' occurs?

In the world, it is very rare that a person who is still alive is misidentified as 'dead'. Stephen Hughes, a senior lecturer at Anglia Ruskin University School of Medicine, analyzes why such a situation occurs.

Being declared dead when you're still alive – why these very rare events occur

An 82-year-old woman was found dead at a nursing home in Long Island, New York around 11:00 on February 4, 2023. An incident has occurred.

An 82-year-old woman was found alive at a New York funeral home after she was pronounced dead hours earlier, police say | CNN
https://edition.cnn.com/2023/02/07/us/new-york-woman-found-alive-funeral-home/index.html

In the past, there have been multiple 'resuscitations ', such as a woman who was confirmed dead in a hospital and removed from life support equipment and was resuscitated 10 minutes later, and a woman who was enshrined in the mortuary after being confirmed dead was brought back to life. The case has been confirmed.

Determining whether a person is really dead has long been a painstaking process, as it can be a big problem if you get it wrong. For example, sailors used to wrap the corpse in canvas and then put the last needle through the corpse's nose. This is for final confirmation that if you are alive you will wake up in pain.

As expected, in modern times, methods such as sticking needles are not used to check whether the person is dead. Confirm that you are dead when you meet the conditions such as not to.

Still, there are some cases where people who should have been confirmed dead are revived. Since cases are rare in Europe, Mr. Hughes may have been affected by differences in medical death confirmation procedures, and he was treated as dead because the death confirmation was not performed correctly when there was no money for a doctor. I am pointing out the possibility that it has been done.

As a case of overlooking the signs of survival, for example, if the breathing is extremely shallow, there is a possibility that heart sounds and breath sounds may not be noticed. Also, immersion in cold water slows the heart rate, which can lead to the illusion of death.

In addition, overdose of sedatives can make the brain appear dead, as it protects the brain from oxygen deprivation and reduces reactivity, restricting breathing and circulation. It is said that there is.

There are also cases of fainting. In Honduras, a pregnant teenager was buried after hearing gunshots in her neighborhood and was found screaming in her grave the next day. The teenager appears to have been unconscious for an extended period of time, misidentified as dead.

Mr. Hughes says that the case of ``a person who should have died has come back to life'' is a rare case, although it stands out because it is taken up sensationally when it occurs.