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Deep hypothermic circulatory arrest (DHCA) is a surgical technique in which the temperature of the body falls significantly (between 20 °C (68 °F) to 25 °C (77 °F)) and blood circulation is stopped for up to one hour. It is used when blood circulation to the brain must be stopped because of delicate surgery within the brain, or because of ...
The prognosis is improved if clinical death is caused by hypothermia rather than occurring prior to it; in 1999, 29-year-old Swedish woman Anna Bågenholm spent 80 minutes trapped in ice and survived with a near full recovery from a 13.7 °C core body temperature. It is said in emergency medicine that "nobody is dead until they are warm and dead."
Sam Parnia also refers to two cardiac arrest studies and one deep hypothermic circulatory arrest study where patients reported visual and/or auditory awareness occurring when their brain function had ceased. These reports "were corroborated with actual and real events". [60] [50]
For example, surgeons already employ a method known as deep hypothermic circulatory arrest (DHCA) in order to stop brain function and circulation for certain types of major surgeries.
Deep hypothermic circulatory arrest is a medical technique in which the brain is cooled as low as 10 °C, which allows the heart to be stopped and blood pressure to be lowered to zero, for the treatment of aneurysms and other circulatory problems that do not tolerate arterial pressure or blood flow. The time limit for this technique, as also ...
Hypothermia and extreme stress can both precipitate fatal tachyarrhythmias. A more modern view suggests that an autonomic conflict – sympathetic (due to stress) and parasympathetic (due to the diving reflex) coactivation – may be responsible for some cold water immersion deaths.
For example, one trial found that cold-water immersion reduced sickness absence by 29%. However, there wasn’t a significant difference between the number of illness days reported by the control ...
Hypothermia is the other key component of most cardioplegic strategies. It is employed as another means to further lower myocardial metabolism during periods of ischemia . The Van 't Hoff equation allows calculation that oxygen consumption will drop by 50% for every 10 °C reduction in temperature.