• Yoon Jung Kim, Chul-Woo Jung, Seungeun Choi, Youngwon Kim, and Jeoung-Hwa Seo.
• Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea.
• Can J Anaesth. 2023 Oct 1; 70 (10): 163516421635-1642.

PurposeThe use of smart glasses during ultrasound-guided needle procedures may reduce operators' head movements but has not been shown to improve procedural performance. Laser guidance has been shown to decrease the time required for ultrasound-guided procedures in phantom models but has not been tested clinically. We hypothesized that adding laser guidance to the use of smart glasses for ultrasound-guided radial artery catheterization using the long axis approach would improve performance by relatively inexperienced users unfamilar with these techniques.MethodsIn an unblinded controlled trial, we enrolled 52 patients requiring radial artery catheterization under anesthesia, randomized into two groups: smart glasses only (SO) (control; N = 26) or smart glasses with laser guidance group (SL) (N = 26). We assessed catheterization time (primary outcome), the number of needle redirections, first-pass success rate, and operator satisfaction (100 = most satisfactory; 0 = unsatisfactory).ResultsComparing the SL with the SO group, catheterization time was shorter (median [interquartile range], 13 [9-20] sec vs 24 [18-46] sec, P < 0.001) and the number of needle redirections was lower (0 [0-1] vs 3 [1-3], P < 0.001) while the first-pass success rate (50% vs 12%, P = 0.007) and operator satisfaction score (85 [76-95] vs 52 [44-74], P < 0.001) were higher.ConclusionLaser guidance improved the performance of ultrasound-guided radial artery catheterization using smart glasses in users inexperienced in the long axis in-plane approach. Nevertheless, it is unclear whether these findings are clinically significant.Study Registration DateCRIS.nih.go.kr (KCT0007168); registered 8 April 2022.© 2023. Canadian Anesthesiologists' Society.

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