#anoxia  severe hypoxia; absence of oxygen in inspired gases or in arterial blood or in the tissues
  supertype:  #hypoxia  a very strong drive resulting from a deficiency of available oxygen in the blood and bodily tissues (short of anoxia)
  subtype:  #anemic_anoxia  anoxia resulting from a decreased concentration of hemoglobin
  subtype:  #anoxic_anoxia  anoxia resulting from defective oxygenation of the blood in the lungs
  subtype:  #ischemic_anoxia__stagnant_anoxia  anoxia resulting from slow peripheral circulation (such as follows congestive cardiac failure)

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