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Table 3 Results of ultrasonographic measurements in control group and median nerve group

From: Median nerve block increases the success rate of radial artery cannulation in women with gestational hypertension undergoing cesarean section

  Control
(N = 47)
Median nerve
(N = 47)
P value
Radial artery diameter (mm)    < 0.001
 T1 0.25 ± 0.04 0.25 ± 0.03  
 T2 0.26 ± 0.04 0.30 ± 0.04  
 T3 0.20 ± 0.04 0.25 ± 0.05  
Percentage change of radial artery diameter at T2(%) 4(0–8) 22(14–28) < 0.001
Percentage change of radial artery diameter at T3(%) −17[(−24)-9] 0[(−4.9)-8.7] < 0.001
CSA (cm2)    < 0.001
 T1 0.052 ± 0.015 0.049 ± 0.014  
 T2 0.054 ± 0.015 0.075 ± 0.018  
 T3 0.033 ± 0.013 0.049 ± 0.018  
 Percentage change of CSA at T2(%) 0(0–17) 50(33–67) < 0.001
 Percentage change of CSA at T3(%) −33[(−41)-(−25)] 0[(−3.6)-25.0] < 0.001
TAMAX (cm/sec)    0.015
 T1 18 ± 9 16 ± 4  
 T2 23 ± 10 31 ± 8  
 T3 22 ± 8 30 ± 11  
Volume of blood flow (ml/sec)    < 0.001
 T1 1.02 ± 0.84 0.79 ± 0.32  
 T2 1.28 ± 0.92 2.34 ± 0.92  
 T3 0.73 ± 0.57 1.53 ± 1.03  
  1. Values are mean ± SD, median (interquartile range) [range].T1 = Baseline; T2 = 10 minutes after median nerve block or local anesthesia; T3 = 30 minutes after median nerve block or local anesthesia. CSA Cross-sectional area, TAMAX Time Average Maximal Velocity