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Korean J Anesthesiol > Volume 27(11); 1994 > Article
Korean Journal of Anesthesiology 1994;27(11):1596-1600.
DOI: https://doi.org/10.4097/kjae.1994.27.11.1596   
Preoxygenation Using End - tidal Oxygen Concentration.
Guie Yong Lee, Rack Kyung Chung, Jong In Han, Choon Hi Lee, Eun Jung Oh
Department of Anesthesiology, College of Medicine, Ewha Womans University, Seoul, Korea.
Abstract
Preoxygenation is a standard anesthetic technique for preventing hypoxemia during the in- duction of anesthesia. This is achieved by alveolar denitrogenation while ventilating the lungs with 100% oxygen. Until recently there was no satisfactory nitrogen monitoring device except mass spectrometry which is not generally available. We used a convinient and readily available measuring technique to evaluate the effectpreoxygenation. In 31 healthy volunteers breathing 100% oxygen, end-tidal oxygen concentration have been measured at 15 seconds interval from the start of preoxygenation. A circle system was flushed with 100% oxygen and flow rate of 8 liter per minute. The gas sampling line of the Capnomac II (Datex, Finland) was placed in nasal cavity. At 1, 2, 3 minutes, mean end-tidal oxygen concentration was 78.7%, 89.2%, 91.9 % respectively. End-tidal nitrogen concentration was approximately 16.1 %, 5.8%, 3.2%. We conclude end-tidal oxygen concentration is a good indirect measure of denitrogenation.
Key Words: Preoxygenation; Nitrogen; End-tidal oxygen concentration


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