• Bing Bai, Yuan Tian, Yuelun Zhang, Chunhua Yu, and Yuguang Huang.
• Department of Anaesthesiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100730, China.
• BMC Anesthesiol. 2020 Sep 14; 20 (1): 231.

BackgroundUltrasound guidance can increase the success rate and reduce the incidence of complications of arterial cannulation. There are few studies on the utility of the dynamic needle tip positioning (DNTP) technique versus the angle-distance (AD) technique for ultrasound-guided radial arterial cannulation in adult surgical patients. We assessed and compared the success rates and incidences of complications of these two short-axis out-of-plane techniques.MethodsA total of 131 adult surgical patients were randomized into DNTP and AD groups to undergo ultrasound-guided radial artery cannulation. The primary outcome was first-pass success without posterior wall puncture. The secondary outcomes included the first-pass success rate, 10-min overall success rate, cannulation time, posterior wall puncture, and the number of skin punctures.ResultsThe first-pass success rates without posterior wall puncture were 53.8% in the DNTP group and 44.6% in the AD group (RR = 1.22, 95% CI: 0.86-1.72; P = 0.26). The cannulation time was significantly longer (P = 0.01) in the DNTP group [79.65 (54.3-109.4) seconds] than in the AD group [47.6 (24.9-103.8) seconds]. The posterior wall puncture rate was significantly lower (P = 0.002) in the DNTP group (29.2%) than in the AD group (56.1%; RR = 0.56, 95% CI: 0.42-0.82).ConclusionsThere were no significant differences in the first-pass success rate, with or without arterial posterior wall puncture, or in the 10-min overall success rate between the DNTP and AD groups. However, the cannulation time was longer and the posterior wall puncture rate was lower in the DNTP group.Trial RegistrationThe trial was registered at www.clinicaltrials.gov (No: NCT03656978 ). Registered 4 September 2018.

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