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Respiratory Control Related to Altitude and Anesthesia

  • J. W. Severinghaus
Part of the Developments in Critical Care Medicine and Anesthesiology book series (DCCA, volume 25)

Abstract

This discussion includes a review of physiology and pharmacology of the normal and abnormal regulation of breathing as it relates to both anesthesia (1) and high altitude (2,3), and discusses several recent relevant advances in understanding. During days to weeks of hypoxia the ventilation is gradually stimulated not only by a fall of CSF Hco- 3 but also by a rise in hypoxic drive, probably due to a greater carotid body sensitivity. The central CO2 chemoreceptor neurons have been histologically identified in rats by c-fos staining after hypercapnia. They apparently generate acid in hypoxia which may be detected on the local surface in ECF. This presumed intracellular lactic acidosis may underlie hypoxic ventilatory depression, which occurs after 5–20 minutes of hypoxia. This complicates understanding of altitude acclimatization while offering new insight into the mechanism of CO2 and pH detection as a transmembrane pH gradient change. The effects of anesthesia on hypoxic response is in part due to the raising of PCO2 threshold by both the anesthetic and hypoxia and the flattening of CO2 response which hypoxia multiplies. After anesthesia, respiration may be compromised by interactions between the effects of residual depressant drugs, lack of lung-pump strength and airway patency, and hypoventilation at normal PCO2 due to repaying a deficit of body CO2 stores.

Keywords

Carotid Body Ventilatory Response Peripheral Chemoreceptor Hypoxic Ventilatory Response Sustained Hypoxia 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1992

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  • J. W. Severinghaus

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