Abstract
Abstract Detailed techniques are presented for a method of alveolar CO 2 determination which utilizes a fractional to-and-fro continuous sampling method and a rapid infrared absorption gas analyzer with a direct recording system. The validity of the method was established by comparing the alveolar CO 2 values with arterial CO 2 tensions of blood drawn simultaneously. Twenty-two such comparisons reveal a mean deviation of −0.9 mm. Hg with a standard deviation of the mean of ± 1.8 mm. Hg. The limitations of the method are discussed. The method is compared with other methods for determining alveolar CO 2 concentration. The practical value of the infrared method as a clinical guide to proper administration of artificial ventilation is demonstrated.
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