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New research shows that some people's brains are not only active after an hour of cardiac arrest, but also generate clear consciousness and even see a replay of their lifetime experiences.

(by Chen Qiang / tr. by Robert Taylor)

This is not a rumor, but a fact: when we are on the verge of death, our life experiences can indeed flash before our eyes. This is the conclusion of a new study from New York University.

"I remember seeing my father." A patient who recovered his heartbeat after cardiac arrest said.

"I caught a glimpse of my life and felt pride, love, joy and sadness, all of which poured into my heart." Another patient who was pulled back from the brink of death recalled.

"I do remember that there was a bright existence. Standing next to me. It looks down on me like a tower of power, but it only exudes warmth and love." The third survivor shared.

These memories are experienced by patients with sudden cardiac arrest undergoing cardiopulmonary resuscitation when they are on the brink of death.

Doctors usually believe that there is little brain activity after more than 10 minutes of cardiac arrest, because no heartbeat means a lack of oxygen in the brain. However, a new study overturns this view.

According to a study published on Sept. 14 in the medical journal Resuscitation, some patients with cardiac arrest show signs of near-normal brain activity during CPR, even an hour after cardiac arrest. Some of the patients who survived were able to recall the near-death experience.

Is there still brain activity after cardiac arrest? Near-death experience refers to a series of unusual feelings experienced by some people when they are on the verge of death. Scientists once thought that these were just hallucinations or dreams caused by lack of oxygen in the brain, but in recent years, some scientists have begun to pay more attention to these phenomena, thinking that they can reveal the mysteries of human consciousness and death.

Sam Parnia, an associate professor of medicine at New York University's Langney Medical Center, has been engaged in the study of the process of death for a long time. The new study was led by Pania. He and his colleagues worked with 25 hospitals, mainly in the United States and the United Kingdom, to try to identify physiological activities associated with near-death experiences.

They used a portable device that can be placed on the heads of patients who are having a heart emergency to measure their brain oxygen levels and brain electrical activity without interfering with their treatment.

During the study period from May 2017 to March 2020, these hospitals performed cardiopulmonary resuscitation on 567 patients, but only 53 survived. Pania et al found that 40% of survivors recalled some degree of conscious experience during CPR.

The study also found that in some patients who received brain monitoring, nearly 40% of their brain activity returned from "no signal" to normal or near normal during CPR, even though some people's hearts had stopped beating for more than an hour. EEG records showed that the patients' brain waves peaked in bands related to advanced neurological functions, such as gamma, Delta, Sita, Alpha and beta waves.

Near-death experiences have something in common. Pania and others have found that near-death experiences are not hallucinations or dreams, but a state of sharper, vivid and clear consciousness. They also found that many experiences are universal, regardless of whether the patient is from the United States or other countries. Among them, one of the most common common experiences is the 360-degree perception of the surrounding space.

"when they are dying, they feel as if they are separated from their bodies. They are free to move and look around, but they are still in that [hospital] room. They think they are fully awake." Pania said.

In this state of consciousness, patients usually watch doctors and nurses try to save their lives, but their observation is completely calm and fearless.

In addition, many people see a replay of their life experiences when they are dying. "somehow, their entire life experience emerges in the process of death," Pagna said. "it's a profound, purposeful and meaningful reflection on their lives."

Their review of life is not in any particular order, but an overall assessment of their own actions and relationships with others, and is more moral and ethical.

Another common common experience is to go back to a place like home. "somewhere they feel familiar, they are going to go. They continue their current journey to a place where they feel like home." Pania said.

Dying people can experience all the memories. How did these near-death experiences come about? Pania and his colleagues put forward a hypothesis. They argue that, in general, there are "braking systems" in the brain that block most of our brain activity from our conscious experiences, allowing people to process the information they care about more efficiently.

However, in the dying brain, this "braking system" fails. Those parts that are usually dormant become active, and dying people gain access to their entire brains-all thoughts, all memories, everything. Pania says they don't know what the benefits of this phenomenon are, but it seems to be to prepare people for the transition from birth to death.

Pania and his colleagues hope that this study will help us deepen our understanding of consciousness and the process of death. In addition, the findings suggest that the brain is more resistant to hypoxia than previously expected.

Pania says some people may be considered irreparable, but there is actually hope for recovery. "the traditional idea among doctors is that once the brain is deprived of oxygen for more than 10 minutes, it will suffer permanent damage," he said. "but our work has found that during continuous CPR, the brain can show signs of recovery in electrical activity.

For individuals who seem irreparable, doctors can invite their families to come in to say goodbye, because patients may still feel the sound around them.

References:

Https://www.resuscitationjournal.com/article/S0300-9572(23)00216-2/fulltext

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