Continuous block at the proximal end of the adductor canal provides better analgesia compared to that at the middle of the canal after total knee arthroplasty: a randomized, double-blind, controlled trial

Table 2 Cumulative sufentanil consumption (μg/kg) after surgery for both groups

	Proximal end (n = 30)	Middle (n = 30)	P value
Cumulative sufentanil consumption (μg/kg) at different time points
Primary outcome
24 h	0.22 (0.15–0.40)	0.39 (0.23–0.52)	0.026
Secondary outcomes
2 h	0 (0–0.04)	0.02 (0–0.07)	0.222
4 h	0.03 (0–0.08)	0.07 (0–0.21)	0.143
8 h	0.06 (0–0.18)	0.21 (0.10–0.44)	0.001
48 h	0.43 (0.23–0.74)	0.59 (0.41–0.89)	0.031
Cumulative sufentanil consumption (μg/kg) at different time intervals
8 h-to-24 h	0.13 (0.07–0.17)	0.10 (0.05–0.19)	0.525
8 h-to-48 h	0.38 (0.22–0.50)	0.38 (0.19–0.52)	0.842
24 h-to-48 h	0.17 (0.08–0.36)	0.21 (0.11–0.46)	0.280

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