Determination of alveolar capillary temperature1

Journal/Book: Reprinted fron JOURNAL OF APPLIED PHYSIOLOGY Vol. 18 No. 1 (1963) 107-113. 1963;

Abstract: (With the Technical Assistance of M. Passke) Department of Physiology The University of Buffalo School of Medicine Buffalo New York Since the alveolar temperature influences the solubility of most inert gases in pulmonary capillary blood knowledge of the solubility in arterial blood may be used to determine the equilibration temperature i.e. alveolar temperature. Because the partial pressure of inert gas in arterial blood cannot be deduced from the alveolar pressure direct determination of solubility is impractical. However if a mixture of two inert gases is used the ratio of partial pressures in the arterial blood is equal to that in the inspired gas and the ratio of gas contents will vary with the ratio of solubility. The blood solubility ratio He/A varies by 134% per degree centigrade. Using an O2-He-A inspired mixture the following points were established in five resting subjects fully clothed.1) The pulmonary capillary temperature (TPC) is linearly related to the rectal temperature (TR) with a regression line equation: TPC = 375 + 24 TR - 371). 2) When measurements were obtained an the same subject in different days these measurements show that variations in TPC are in the same direction as changes in TR but much more pronounced. . . .

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