Near-Death Experience Phenomena in Cardiac Survivors

Near-death experiences (NDEs) in individuals who have survived cardiac arrest encompass a spectrum of profound perceptual and emotional events that occur during or immediately following a life-threatening interruption of circulation. Common phenomenological features include a sense of peace, an apparent exit from the physical body, transit through a tunnel towards a luminous environment, encounters with deceased figures and a rapid review of personal memories. Such experiences are reported by approximately 10–20 per cent of cardiac arrest survivors. While the precise neurobiological substrates remain under investigation, current evidence implicates a complex interplay of transient hypoxia, altered carbon dioxide levels, transient brain network disconnection and individual cognitive or spiritual predispositions. Beyond their theoretical relevance to the boundaries of consciousness, NDEs exert lasting effects on survivors’ outlook, influencing clinical approaches to resuscitation and post-intensive-care support.

Research from Nature Portfolio

Investigations employing hypnotic modulation have demonstrated that key aspects of NDE phenomenology can be elicited and studied under controlled conditions. In one proof-of-concept study, volunteers who previously reported genuine NDEs underwent a protocol of normal recall and hypnotic suggestion while high-density electroencephalography was recorded. Hypnotic induction heightened subjective absorption and dissociative experiences, and the re-enacted NDE state was associated with increased alpha activity in frontal and posterior regions. This paradigm offers a novel methodological framework for prospectively exploring the neural correlates of disconnected consciousness and for disentangling the physiological and phenomenological components of NDEs.

Near-Death Experience Phenomena in Cardiac Survivors publication trend

The graph below shows the total number of articles in near-death experience phenomena in cardiac survivors across all publications each year (not limited to Nature Index journals).

Technical terms

Greyson NDE Scale: A standardised questionnaire used to identify and quantify the intensity of near-death experiences.

Electroencephalography (EEG): A non-invasive method for recording the electrical activity of the brain via scalp electrodes.

Hypnotic induction: A technique employed to facilitate an altered state of consciousness, enhancing suggestibility and experiential immersion.

Out-of-body experience: A subjective sensation of perceiving one’s own body from an external vantage point.

Cardiac arrest: An abrupt cessation of effective heart function, leading to a critical reduction in cerebral perfusion.

References

1. Near-Death Experience as a Probe to Explore (Disconnected) Consciousness. Trends in Cognitive Sciences (2020).
2. Incidence of near-death experiences in patients surviving a prolonged critical illness and their long-term impact: a prospective observational study. Critical Care (2023).
3. Neurophenomenology of near-death experience memory in hypnotic recall: a within-subject EEG study. Scientific Reports (2019).
4. Temporality of Features in Near-Death Experience Narratives. Frontiers in Human Neuroscience (2017).
5. The effect of carbon dioxide on near-death experiences in out-of-hospital cardiac arrest survivors: a prospective observational study. Critical Care (2010).