The relationship between carotid artery colour Doppler finding and cerebral oximetry

摘要

Background: In some cases, permanent reduction in cerebral functioning affects a high percentage of patients undergoing cardiovascular surgery. We studied the relationship between the results of preoperative bilateral carotid artery colour Doppler sonography and regional cerebral oxygen saturation (rSO ₂ ) during coronary artery bypass graft surgery (CABG). Materials and Methods: This study was a cross-sectional analytical study conducted with 96 candidates for off-pump CABG. This study determined the percentage of the correlation of rSO ₂ with demographic information, diabetes, hyperlipidemia, hypertension, myocardial infraction (MI), and smoking, and also provided information on the presence and type of plaque, intima-media thickness (IMT), and percentage of stenosis of carotid artery detected through colour Doppler sonography. Data were analyzed by the t -test, the Chi-square test, and simple linear regression. Results: In this study, the mean value of rSO ₂ increased after intubation compared to the mean before intubation, the difference being statistically significant ( P = 0.005). A comparison of the mean rSO ₂ of the right side of the brain and the percentage of right carotid obstruction (stenosis of less than 50% vs. stenosis with a range of 50-69%) revealed that the mean rSO ₂ at the time of the partial-clamp between carotid stenosis less than 50% and carotid stenosis with a range of 50-69% was statistically significant ( P = 0.043). Conclusions: There is no statistically significant correlation between rSO ₂ and percentage of carotid artery stenosis less than 70%. It is advised that rSO ₂ and carotid stenosis of greater than 70% be studied in future.