From: Perfusion index (PI) measured in the brachial plexus blocks performed by ultrasonography: investigation of correlation with block success
Perfusion index (PI)
Axillary block (n:25)
Infraclavicular block (n:8)
p value
PI before block
3.2 ± 2.1
3.5 ± 2.0
0.550
5th min PI
6.7 ± 2.7
9.3 ± 5.3
0.150
10th min PI
9.6 ± 3.6
10.0 ± 3.0
0.352
20th min PI
10.7 ± 2.7
11.7 ± 3.7
0.374