Ultrasound-guided radial artery cannulation
The left radial artery was chosen and the puncture point was close to 2 cm from the radial styloid process. The operator performed ultrasound-guided puncture at 3 min after the intervention/control injection and the puncture time was recorded.We applied the out-of-plane without guide wire technique and a 20-gauge arterial catheter to perform arterial cannulation [