Korean J Anesthesiol.  1994 Nov;27(11):1596-1600. 10.4097/kjae.1994.27.11.1596.

Preoxygenation Using End - tidal Oxygen Concentration

• Lee GY
• Chung RK
• Han JI
• Lee CH
• Oh EJ

• KMID: 2236929
• DOI: http://doi.org/10.4097/kjae.1994.27.11.1596

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.

Keyword

Preoxygenation; Nitrogen; End-tidal oxygen concentration

MeSH Terms

Anesthesia
Anoxia
Healthy Volunteers
Lung
Mass Spectrometry
Nasal Cavity
Nitrogen
Oxygen*
Respiration
Nitrogen
Oxygen