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The near-death experience (NDE) is an altered state of consciousness which arises when a person is critically ill or injured and possibly clinically dead. It should not be conflated with other mental events such as the deathbed vision or the fear or anticipation of death. Many believe that the NDE represents a genuine paranormal phenomenon providing a glimpse of an otherworldly existence and proof of an afterlife. Those who are skeptical of such a survivalist or supernatural interpretation have long pointed out that the core components of the NDE can be readily simulated with a variety of states, conditions and agents. In this conception, the NDE is reduced to no more or less than an extraordinarily complex hallucination. Since its rediscovery in the 1970s, multiple, often ingenious, attempts have been made to account for the NDE in such naturalistic or neuroscientific terms. None has so far proven completely satisfactory. One of the oldest, least considered but still promising is the CO2 theory which argues that a hypercarbic brain is a necessary precursor for the induction of a NDE. Supportive evidence that CO2 does play a pivotal role in the generation of the NDE can be gathered from diverse sources. These include: 1. measurement of blood gases; 2. Meduna’s now abandoned CO2 therapy; 3. analysis of the very limited number of pathophysiological conditions underlying the NDE; 4. recent discoveries of the role of 5-HT neurons in the central respiratory system. A model is proposed in which CO2 molecules are considered to be functionally equivalent to those of the classical hallucinogens (LSD, mescaline, psilocybin, dimethyltryptamine). These agents can mimic the phenomenology of the NDE with remarkable fidelity. What is still missing from any such explanation is the long-sought transduction mechanism which converts physical events into mental ones. This is a generic problem which confronts all attempts to explain the neurogenesis of mystical, psychedelic or visionary activity.
Tanwir FarzeenCorresponding author Associate Professor-HOD Periodontology, Bahria University Medical & Dental College
Phenomenology is a ritual of Qualitative research methodology. Interviews in healthcare enables researchers to recognise and understand data from lived experiences of the participants by using Phenomenological approach. The purpose of this article is to review the various face to face in depth interviews conducted using Husserl’s descriptive, Heidegger’s interpretive phenomenology or Hermeneutic phenomenological approach in healthcare. The in-depth interview will help to understand the health issues and ethical issues faced by participants. Methodology Four articles were selected based on phenomenological approach. Article.1 was based on Hermeneutic Phenomenology approach. In this study thirteen women were taken as sample. Sampling was done by snowball method. The women were asked to share their rural maternity experience. Data was analyzed without any influence of the researcher. Article.2 was based on Transcendental phenomenology. There were 15 students from 4 different cultural background belonging to different health professional programmes like nursing, medicine, pharmacy, dentistry, and physical therapy. Triangulation methods were used and semi structured interviews were conducted, recorded and transcribed. Health professional students shared their lived experience with patients. Article.3 was based on a study conducted using both Transcendental phenomenology for patients interviews and Hermeneutic phenomenology for healthcare professionals’ interviews. The semi structured interview of patient was taken to understand and record their lived experience with the medication without any bias or interpretation and data received was bracketed. The healthcare professionals’ interviews were conducted on Hermeneutic strategy regarding the medications they prescribe for life threatening illnesses. Article 4 was based on Hermeneutic phenomenological approach. There were nine patients selected and in depth semi-structured interviews were conducted. The patients shared their experience of living with a life limiting illness.