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Mind, Brain & Consciousness During Cardiac Arrest Sam Parnia MD, PhD Pulmonary & Critical Care Medicine State University of New York Stony Brook, USA University of Southampton, UK
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None Disclosures
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What to do when someone dies? Historical Perspectives on Resuscitation Early in history – Galen: Life = Heat & Lifeless = Cold - Heat to prevent death from taking the person Bellows Method – started in 1530’s – lasted 300 yrs - Flagellation – to stimulate a response - Warm ash - Burning excrement or hot water on body Fumigation Method – 1700’s Inversion, Barrel, Trotting Horse - 1700- 1800’s Mouth-to-Mouth & Chest Compression - 1950-60’s
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Irreversible Death Heart attack Causes of death Traffic accident Dying Process – potentially reversible Lasts: Few seconds – 10’s min’s – over an hour Cardiac Arrest/Clinical Death Impact of Resuscitation Science 50 Years on – Death not a “moment” it is a “reversible” process. Uncharted Territory Shock: 02 delivery organs inadequate
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Cardiac Arrest “Global Stroke” Pathophysiology of Cardiac Arrest “Whole body ischemia”– lack oxygen Brain Oxygen & Energy Stores(ATP) depleted – Accumulation toxins (adenosine, lactate, H+) Cells Dysfunction – massive intracellular Ca+ accumulation – toxicity - death Permanent Brain Cell Death – ? Hours later
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Does Brain Function During Cardiac Arrest? EEG during Cardiac Arrest – slowing - isoelectric (flatline) 10– 20 s Remain flat – until resumption of heartbeat if early intervention Prolonged cardiac arrest - EEG returns “hrs” after. Animal study - 15 min cardiac arrest then resuscitation: - EEG flat 21 ± 5.7 s (n=10) - 90 ± 24.7 min - bursts of slow waves Kano T, Hashiguchi A, Sadanaga M. Resuscitation 1993; 25: 265-281
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So Why Does it Matter?
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What are the wider implications of cardiac arrest research? - Can we bring people back safely? - What happens after we die?
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What Happens When We Die? Near Death Experience (NDE) ‘Life after life’ Raymond Moody 1975 Reactions - ‘Life after life – Hallucination - Fabrication Retrospective Studies - Some describe negative NDE 4% prevalence of NDE in USA – Gallup 1982 Problem: Social & Medical Perception of Death – Irreversible
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19 th century Swiss accident survivors 15 th century Dutch painting – H Bosch Plato’s Republic & many others… Ascent to the Empyreon – H Bosch (1450 – 1516) Cognitive & Mental Activity – Near Death Experience (NDE)
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NDE described in Japan, China, India and ++++ Consistent core features Studied in children Case of 3 year old sent to Southampton Cognitive & Mental Activity – Near Death Experience (NDE)
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Physiological Psychological Transcendental WHY DO NEAR DEATH EXPERIENCES OCCUR? Other … Anticipation of death - ? ‘fear death’ experience Chemical changes in brain - hallucination True separation of mind/soul from body
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WHY DO NEAR DEATH EXPERIENCES OCCUR? – Rumi’s Elephant in the Dark
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Near Death Experience – Problems! Cardiac arrest – Biologically = death What do we mean by near death? – scientifically too vague – led to much controversy New Term: Actual Death Experience
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Irreversible Death Heart attack Causes of death Traffic accident Dying Process – potentially reversible Lasts: Few seconds – 10’s min’s – over an hour Cardiac Arrest “Near Death” or “Actual Death” Experience
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Parnia S, Waller D, Yeates R, Fenwick P, A qualitative and quantitative study of incidence, features and aetiology of NDE's in cardiac arrest survivors Resuscitation Feb 2001 48, 149-156 What happens to mind and consciousness during cardiac arrest?
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344 cardiac arrest survivors - 10 hospitals Largest NDE Study in Cardiac Arrest 41 (12%) reported core NDEs - No association with: 8 year follow up - positive change in life Did not test physiological parameters ?? Account for NDE through brain processes? Transformation following NDE Van Lommel P et al – Near-death experience in survivors of cardiac arrest: a prospective study in the Netherlands. Lancet 2001; 358:2039-2045 Medication Fear of death prior to cardiac arrest
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Wider Implications of Consciousness During Cardiac Arrest ? Signify improved brain Resuscitation? - Need to study “real time” brain resuscitation. When is human mind/consciousness lost permanently and cannot be retrieved after death?
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Death – Physical Process Changes in Cells including Brain – Cell damage within minutes Brain Cells undergo Irreversible Damage Eventually leads to bodily destruction Minutes Hrs - Days When do the mind & consciousness cease existing?
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Scientific Paradox: ? mind/consciousness continue function when brain stopped working and reached the clinical criteria of death Five independent studies – published since 2001 UK, Holland, USA 10-20% people revived from cardiac arrest & clinical death – consciousness + thought processes + can “see” & “hear” Death – What Happens to Mind & Consciousness?
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Paradox: Consciousness during Unconsciousness! Possible explanations: - Arise just before or after cardiac arrest - do not arise at all - Unlikely - ? millions of cases - Need to re-examine mind/brain theories
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The relationship of mind and brain: Challenge for 21st century science?
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How do we have ‘consciousness’ (psyche or soul) from brain processes? Mind and Brain - Problem of Consciousness, Psyche or Soul How do thoughts, feelings and all aspects of mind arise from brain processes?
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Mind and Brain - Problem of Consciousness
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Descartes - Cartesian model From: Brain Atlas Harvard Medical School Ancient Greeks - Human Soul Cerebral localisation -19 - 20C Modern scanning techniques - f MRI, PET History
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Mapping the mind Complex thoughts = Activity in multiple areas of brain Identifying brain cell activity during thoughts – correlation NOT CAUSATION
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Mind and Brain - Problem of Consciousness Current Views - - Others – Quantum processes - Hameroff/Penrose Irreducible entity: electromagnetic/mass/Gravity Chalmers Mind/Brain – Separate – Eccles/ Elahi - Conventional – Neural Networks Greenfield/Crick/Koch/ Dennett
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Reality of any experience is socially determined - not ‘neurologically’ – Whether NDE/Love or otherwise… Are Experiences Real or Hallucinations? All experience mediated by brain pathways NDE – Out of body experiences - many claim objectively verifiable events – Can we test and determine its reality...?
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First large scale study to examine claims to “see” and “hear” AWARE STUDY (AWAreness during Resuscitation) - launched 2008. International Multicentre Study of Consciousness during Cardiac Arrest Aim to use Sophisticated Technology (cerebral oximetry) to study brain oxygen delivery with consciousness
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Cerebral Oximetry Optical Monitoring technique using Beer Lambert law Assesses regional O 2 (rSO 2 %) (balance O 2 delivery & uptake) Represents mostly cerebral venous saturation Acceptable Normal Values 60- 80%
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Role of cerebral oximetry in predicting return of spontaneous circulation (ROSC) in cardiac arrest using manual CPR * * p = <0.0016 Mann-Whitney Test, ROSC = Return of Spontaneous Circulation(No ROSC n= 15, ROSC n= 7)
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* Impact of Automated CPR (LifeStat) on rSO 2 * p= <0.0001 Mann-Whitney (Manual CPR n=22, Automated(LifeStat) CPR n=12)
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Time (mins) % rSO2 Illustration of the Impact of Manual & Automated Chest Compression on Cerebral Perfusion in Two Patients Automated CPR (patient 1) Manual CPR (patient 2) ROSC = Return of Spontaneous Circulation
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Manual CPRAutomated CPR * % Survival (ROSC) ROSC = Return of Spontaneous Circulation lasting > 20 mins. *p < 0.05 using Fischer's Exact test. (Manual CPR n=44, Automated CPR n=20) Automatic CPR leads to higher Return Spontaneous Circulation Following Cardiac Arrest
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University of Southampton, Dr Peter Fenwick (Psychiatry), Dr Charles Deakin (cardiac anesthesia), Dr Paul Little (research design), Professor Robert Peveler 2 (Psychiatry), Ms Niki Fallowfield (Resuscitation) University of Cambridge: Ms Susan Jones (Resuscitation) Northampton Hospital: Ms Celia Warlow (Resuscitation), St Georges Hospital, London: Ms Leanne Smythe (Resuscitation), St Peters Hospital: Mr Paul Wills (Resuscitation), Mayday Hospital: London Mr Russell Metcalfe Smith (Resuscitation), Royal Bournemouth Hospital: Ms Hayley Killingback (Resuscitation), Morriston Hospital: Dr Penny Sartori (Critical Care Unit), Stevenage Hospital: Ms Salli Lovett (Critical Care) Salisbury Hospital: Mr Iain Macleod (Resuscitation), East Sussex Hospitals, Dr Harry Walmsley (Anaesthetics & Resuscitation) Hammersmith Hospital London: Mr Ken Spearpoint, (Resuscitation), AWARE STUDY – Investigators/advisors Indiana State University, Dr Mark Faber (Pulmonary & Critical Care), University of Virginia: Professor Bruce Greyson (Psychiatry), Dr Robert O’Connor (Emergency) Emory Medical Center: Dr Maziar Zafari (cardiology) University of Vienna: Professor Roland Beisteiner (Neurology), Dr Fritz Sterz (Emergency Medicine), Dr Michael Berger (Neuroscience)
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METHODS – Hidden Targets Southampton
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RESEARCH – Cardiac arrest – Humour!
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Near Death Experience Research How do we study human mind and consciousness during cardiac arrest
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METHODS Open question - ? memory of consciousness Study Experiences- Greyson scale - Cognitive recollections (study) - No cognitive recollections (control) -Physiological – O 2 / CO 2 – Electrolytes Drugs – Cardiac Rhythm - Psychological – ? Religion ? Practicing - Transcendental – Hidden targets … Study Brain & Resuscitation Processes:
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RESULTS – Physiological Southampton Southampton Study: NDE in cardiac arrest 0 10 30 50 70 90 110 130 150 controlstudy Na mmol/l K PaCO2 KPa PaO2 KPa Parnia S, Waller D, Yeates R, Fenwick P, A qualitative and quantitative study of incidence, features and aetiology of NDE's in cardiac arrest survivors Resuscitation Feb 2001 48, 149-156
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Current version – Fixed shelves with fixed images!
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Future Version - Random image generators
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Portable Brain (EEG) Monitor – during cardiac arrest
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Cerebral oximetry – Our experience so far! N=10 - Useful in cardiac arrest - results so far similar to previous - 02% <20% - non survivors ROSC
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