End tidal CO2 versus arterial CO2 monitoring in patients undergoing coronary artery bypass graft

Measuring end tidal carbon dioxide (ETCo2) is one of the methods used for estimating arterial carbon dioxide (PaCo2) during general anesthesia. ETCo2 measurements maybe obviate the need for repeating arterial puncture for determination of arterial PaCo2. This study performed to determine the accuracy of ETCo2 levels as a measure of PaCo2 levels in patients undergoing coronary artery bypass graft and also to evaluate variation of the gradient between PaCo2 and ETCo2, peri- cardiopulmonary bypass operation. In a prospective, cross-sectional study, a total of 40 patients with age 57±11 (35-73) years old undergoing coronary artery bypass graft were enrolled