Хуудас 1 -аас 87 үр дүн
The use of liquefied gases in industry and research has become commonplace. Release into the atmosphere of these gases will result in a displacement of air and a reduction in the oxygen concentration. Exposure to reduced levels of oxygen may cause reduced abilities, unconsciousness or death. This
Hypoxia in aviation remains a major hazard. It may be caused by ascent while breathing air, failure of oxygen supply or loss of cabin pressurisation. Malfunction of equipment or its improper use accounted for the majority of hypoxic incidents in one 10-year military study. Symptoms of hypoxia depend
We have previously formulated and validated a mathematical model specifically designed to describe human respiratory behavior at altitude. In that model, we assumed equality of alveolar and end-pulmonary-capillary oxygen tensions. However, this equality may not hold true during rapid and prolonged
The maneuverability envelopes of current and future fighter/attack aircraft exceed unprotected human tolerance to environmental stress. Human exposure to unconsciousness therefore can result not only inflight, but in research and training laboratories which endeavor to provide methods of enhanced
The purification of a substance which protects mitochondrial activity against its decay in association with various cerebral pathologies, and the effect of this substance in vitro and in vivo have been mentioned. Defatted egg albumin was hydrolyzed with pronase, and diafiltrated through mesh, to
In the development of secondary changes of brain damage caused by injury, tumour and hypoxia of different origin with unconsciousness also the activity of the metalloproteinase matrix (MMP) may participate. Their activation occurs first in the vascular wall which they damage and it may be assumed
BACKGROUND
After traumatic brain injury (TBI), hypotension, hypoxia and hypercapnia have been shown to result in secondary brain injury that can lead to increased mortality and disability. Effective prehospital assessment and treatment by emergency medical service (EMS) is considered essential for
+Gz-induced loss of consciousness (G-LOC) continues to be a threat to aircrew flying high-performance fighter aircraft. All avenues to prevent G-LOC, and to reduce the resulting incapacitation should G-LOC occur, must be explored. Research has begun to accurately quantify all aspects of the G-LOC
The physiological mechanism underlying two of the most potent causes of loss of consciousness in flight, viz. hypoxic hypoxia and exposure to rapid onset of high +GZ accelerations have been explored in this paper, using principally experimental work conducted at the Royal Air Force Institute of
This review describes the neurobiological mechanisms that are relevant for the stunning and killing process of animals in the abattoir. The mechanisms underlying the loss of consciousness depend on the technique used: mechanical, electrical or gas stunning. Direct exsanguination (without prior stun)
In Dutch prospective studies on near-death experiences (NDE) in survivors of cardiac arrest, 18% of the 344 included patients reported such an experience of enhanced consciousness during the period of unconsciousness, during clinical death, during a transient functional loss of the cortex and the
Within the scope of a cerebral magnetic resonance imaging to diagnose a dysphagia in a patient on long-term artificial respiration, the morphological criteria for a HACE (high-altitude cerebral edema) have been met. We found microangiopathic white matter lesions in the area of the corpus callosum
Given that most fatal hangings are suicidal and occur in locations that have been selected to conceal this activity (thus maximizing the chances of a lethal outcome), there has been very little corroboration of the speed with which unconsciousness and death may occur. A 35-year-old male is reported