[Radial] B‐mode ultrasound may leads to lower first‐attempt success rate compared with modified B‐mode ultrasound (low certainty).
[Radial] B‐mode ultrasound probably leads to higher first‐attempt success rate compared with doppler assistance (moderate certainty).
It is very uncertain whether [Radial] B‐mode ultrasound changes first‐attempt success rate compared with near‐infrared laser guidance (very low certainty).
[Radial] B‐mode ultrasound guidance may leads to higher first‐attempt success rate compared with palpation and landmarks (low certainty).
It is very uncertain whether [Radial] In‐plane B‐mode ultrasound changes first‐attempt success rate compared with out‐of‐plane B‐mode ultrasound (very low certainty).
It is very uncertain whether [Radial] Dynamic out‐of‐plane B‐mode ultrasound changes first‐attempt success rate compared with static out‐of‐plane B‐mode ultrasound (very low certainty).
It is very uncertain whether [Radial] Oblique‐axis in‐plane B‐mode ultrasound changes first‐attempt success rate compared with long‐axis in‐plane B‐mode ultrasound (very low certainty).