Preoxygenation Using End - tidal Oxygen Concentration.
10.4097/kjae.1994.27.11.1596
- Author:
Guie Yong LEE
1
;
Rack Kyung CHUNG
;
Jong In HAN
;
Choon Hi LEE
;
Eun Jung OH
Author Information
1. Department of Anesthesiology, College of Medicine, Ewha Womans University, Seoul, Korea.
- Publication Type:Original Article
- Keywords:
Preoxygenation;
Nitrogen;
End-tidal oxygen concentration
- MeSH:
Anesthesia;
Anoxia;
Healthy Volunteers;
Lung;
Mass Spectrometry;
Nasal Cavity;
Nitrogen;
Oxygen*;
Respiration
- From:Korean Journal of Anesthesiology
1994;27(11):1596-1600
- CountryRepublic of Korea
- Language:Korean
-
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.
