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Korean J Anesthesiol > Volume 54(6); 2008 > Article
Korean Journal of Anesthesiology 2008;54(6):609-613.
DOI: https://doi.org/10.4097/kjae.2008.54.6.609   
Is End-tidal Carbon Dioxide Tension Useful to Predict Arterial Carbon Dioxide Tension during One Lung Ventilation? − A Comparison with during Two Lung Ventilation
Hee Cheol Jin, Jae Won Seo, Sang Hyun Kim, Won Seok Chae, Jeong Seok Lee, Yong Ik Kim
Department of Anesthesiology and Pain Medicine, Soonchunhyang University College of Medicine, Bucheon, Korea. anecl0503@yahoo.co.kr
Abstract
BACKGROUND
End-tidal carbon dioxide tension (PETCO2) is widely used to estimate arterial carbon dioxide tension (PaCO2) under various clinical conditions. This study was conducted to determine if PETCO2 during one lung ventilation (OLV) is as useful as PETCO2 during two lung ventilation (TLV) for predicting PaCO2.
METHODS
Forty patients undergoing thoracic surgery were enrolled in this study. During OLV (n = 20) and TLV (n = 20), PaCO2 and PETCO2 were measured. The arterial-end tidal carbon dioxide difference (Pa-ETCO2) was then calculated and a correlation between PaCO2 and PETCO2 was evaluated during OLV and TLV.
RESULTS
Pa-ETCO2 was significantly higher during OLV (8.9 +/- 5.1 mmHg) than during TLV (6.1 +/- 3.9 mmHg). In addition, the correlation between PETCO2 and PaCO2 was less significant during OLV (R(2) = 0.43) than during TLV (R(2) = 0.59).
CONCLUSIONS
PETCO2 during OLV was not as accurate as PETCO2 during TLV for predicting PaCO2, which indicates that greater attention should be given to the maintenance of normocarbia during OLV than during TLV.
Key Words: arterial-end tidal carbon dioxide difference; end tidal carbon dioxide tension; one lung ventilation
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