Korean J Anesthesiol.  2008 Jun;54(6):609-613. 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

• Jin HC
• Seo JW
• Kim SH
• Chae WS
• Lee JS
• Kim YI

• KMID: 1763513
• DOI: http://doi.org/10.4097/kjae.2008.54.6.609

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.

Keyword

arterial-end tidal carbon dioxide difference; end tidal carbon dioxide tension; one lung ventilation

MeSH Terms

Carbon
Carbon Dioxide
Humans
Lung
One-Lung Ventilation
Thoracic Surgery
Ventilation
Carbon
Carbon Dioxide