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Table 5 The secondary outcomes in the ultrasound-assisted group versus conventional puncture group

From: A randomized controlled trial of ultrasound-assisted technique versus conventional puncture method for saphenous venous cannulations in children with congenital heart disease

  ultrasound-assisted group conventional puncture group P-value
The overall proportion of success rate(n), % 65(90.3%) 56(77.8%) 0.080
Rate difference, %(95% CI) 12.5(0.7, 24.3)  
The overall time to cannulation(s) 45.5(36, 96.25) 94.0(56, 171) 0.00
The time to cannulation at the first attempt(s) 41.0(35, 53.75) 60(45, 83) 0.00
Overall puncture numbers 1(1, 2) 2(1, 3) 0.002
Overall numbers of needle redirections 3(1, 7) 7(3, 13) 0.001
Needle redirections at the first attempt 2(1, 5) 3(2, 6) 0.027
The width of saphenous veins (mm) 1.485 + 0.318 1.543 + 0.396 0.375
The depth of saphenous veins (mm) 3.622 + 1.408 3.605 + 1.421 0.949
Complication (n), % 3(4.27%) 2(2.78%) 0.999