Retrospective evaluation of the effect of carotid artery stenosis on cerebral oxygen saturation during off-pump coronary artery bypasses grafting in adult patients

Table 5 Regional cerebral tissue oxygen saturation (rSO₂) during anastomosis

	Patients with CAS (n = 9)		Patients without CAS (n = 14)		P- value
	Left side	Right side	Left side	Right side	P- value
Baseline rSO₂ (%)	60 [8]	60 [9]	63 [10]	65 [9]	0.422
During anastomosis
Mean rSO₂ (%)	60 [7]	60 [6]	59 [8]	60 [8]	0.981
Mean relative change in rSO₂ from baseline (%)	0.6 [12.3]	1.6 [10.5]	-4.8 [9.2]	-7.3 [7.2]	0.100
Minimum rSO₂ (%)	54 [6]	54 [5]	54 [8]	54 [8]	0.977
Relative change in minimum rSO2 from baseline (%)	-9.2 [12.7]	-8.1 [11.7]	-13.5 [11.3]	-16.1 [9.8]	0.316
A decrease in rSO₂ ≥ 10% from baseline (min)	0 [0 – 75]	30 [0 – 75]	23 [0 – 195]	30 [0 – 165]	0.479
A decrease in rSO₂ ≥ 20% from baseline (min)	0 [0 – 45]	0 [0 – 45]	0 [0 – 120]	0 [0 – 120]	0.394
Absolute rSO₂ < 40 % (n)	0	0	0	0	–

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