The relationship between carotid artery colour Doppler finding and cerebral oximetry


1 Department of Radiology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran

2 Department of Cardiac Surgery, Shahid Sadoughi University of Medical Sciences, Yazd, Iran

3 Department of Anesthesiology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran


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.


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