• Mitsutaka Edanaga, Tomohiro Chaki, Michiko Osuda, and Michiaki Yamakage.
• Department of Anesthesiology, Sapporo Medical University School of Medicine, S1, W16, Chuo-ku, Sapporo, Hokkaido, 060-8543, Japan. naga16taka@gmail.com.
• J Anesth. 2024 Jul 9.

AbstractUltrasound guidance has been reported to facilitate radial artery catheterization compared with the palpation method. However, a recent meta-analysis showed that there was not significant differences in the first attempt success rate between the long-axis in-plane (LA-IP) method and the short-axis out-of-plane method. In 2023, we started using a novel T-type probe. We can recognize the needle first during the radial artery access with the short-axis view and then dose it with the long-axis view using the T-type probe. Therefore, we hypothesized that the T-type probe-guided method might heighten the first attempt success rate in radial artery catheterization, even for non-expert practitioners, compared with the LA-IP technique. One hundred and fifty adult patients, older than 20 years, ASA I to III, were randomly assigned to the T-type probe-guided group (Group T: n = 75) or the LA-IP group (Group L: n = 75). The primary outcome was the first attempt success rate. The first attempt success rate in Group T (49/71, 69%) was significantly higher than that in Group L (31/68, 46%) (p = 0.0062). The present study showed that the T-type probe might facilitate the radial artery catheterization rather than the LA-IP method.© 2024. The Author(s) under exclusive licence to Japanese Society of Anesthesiologists.

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