Background: In this study, we investigated the reliability of the estimated creatinine clearance and glomerular filtration rate in patients undergoing on-pump coronary artery bypass grafting.

Methods: A total of 167 patients (124 males, 43 females; mean age 60.9±9.4 years; range, 35 to 83 years) who underwent on-pump coronary artery bypass grafting in our clinic between January 2009 and January 2011 were enrolled in the study. Demographic characteristics of the patients, creatinine clearance rates measured with 24-hour urine collection, and estimated renal function, and glomerular filtration rates according to the formulas of Cockcroft-Gault, Modification of Diet in Renal Disease-four variables and six variables, Jelliffe-1972, Jelliffe-1973, Mawer, Bjornsson, and Gates of preoperative and postoperative first and fifthdays were retrospectively analyzed.

Results: Among all estimated renal function and glomerular filtration rate equations, the Cockcroft-Gault formula yielded the most significant results for the creatinine clearance rate for all periods.

Conclusion: Our study results suggest that the Cockcroft- Gault equation can be reliably used in the evaluation of kidney functions of patients undergoing coronary artery bypass grafting.

Keywords : Coronary artery bypass grafting; glomerular filtration rate; kidney function tests; reliability