CO2 (Carbon Dioxide) - Cerebral Oxygenation

Summary

Several projects in high altitude research in environments with a low oxygen partial pressure (hypobaric hypoxia) leading to hypoxemia showed, that cerebral perfusion and cerebral performance could be improved by adding C02 (cabon dioxide). The investigators hypothesize that adding 5% C02 to 02 (Oxygen) also under normobaric conditions increases the time until a significant cerebral hyopxia is measured by near infrared spectroscopy (NIRS) compared to the administration of 95% 02. lf this hypothesis proves to be true, this approach might be used in situations in which individuals are prone to cerebral hypoxia. In bariatric surgery, patients that experience an apnea phase are more prone to (cerebral) hypoxia due to the fact, that they have a higher body mass index (BMI) leading to a reduced functional residual capacity (FRC), which serves as the oxygen reserve in the body.

Timeline

Start

2018-01-25

Primary completion

2018-10-26

Completion

2019-02-12

Publications

• Background Kety SS, Schmidt CF. THE EFFECTS OF ALTERED ARTERIAL TENSIONS OF CARBON DIOXIDE AND OXYGEN ON CEREBRAL BLOOD FLOW AND CEREBRAL OXYGEN CONSUMPTION OF NORMAL YOUNG MEN. J Clin Invest. 1948 Jul;27(4):484-92. doi: 10.1172/JCI101995. No abstract available.
• Background Karl AA, McMillan GR, Ward SL, Kissen AT, Souder ME. Effects of increased ambient CO2 on brain tissue oxygenation and performance in the hypoxic rhesus. Aviat Space Environ Med. 1978 Aug;49(8):984-9.
• Background Brzecka A. Role of hypercapnia in brain oxygenation in sleep-disordered breathing. Acta Neurobiol Exp (Wars). 2007;67(2):197-206. doi: 10.55782/ane-2007-1648.
• Background Kronenberg RS, Drage CW. Attenuation of the ventilatory and heart rate responses to hypoxia and hypercapnia with aging in normal men. J Clin Invest. 1973 Aug;52(8):1812-9. doi: 10.1172/JCI107363.
• Background Hannay DR, Maddox EJ. Symptom prevalence and referral behaviour in Glasgow. Soc Sci Med (1967). 1976 Mar-Apr;10(3-4):185-9. doi: 10.1016/0037-7856(76)90046-9. No abstract available.
• Background Ainslie PN, Poulin MJ. Ventilatory, cerebrovascular, and cardiovascular interactions in acute hypoxia: regulation by carbon dioxide. J Appl Physiol (1985). 2004 Jul;97(1):149-59. doi: 10.1152/japplphysiol.01385.2003. Epub 2004 Mar 5.

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