TSUNG O. CHENG, M.D., F.A.C.P.
CHENG TO. CENTRAL VENOUS VERSUS ARTERIAL BLOOD GAS VALUES. Ann Intern Med. 1969;71:870-871. doi: 10.7326/0003-4819-71-4-870
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Published: Ann Intern Med. 1969;71(4):870-871.
To the Editor: The recent article by Phillips and Peretz on the use of central venous blood for monitoring pH and Pco2 (Ann. Intern. Med. 70: 745, 1969) is a valuable contribution to a more precise management of the critically ill. However, a few words of caution should be said here with regard to the degree of reliability with which the central venous blood values may be used to predict the precise levels in arterial blood.
First, a distinction should be made between central venous blood and mixed venous blood. Whereas mixed venous blood Pco2 (which incidentally, may be obtained
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