[Radial] B‐mode ultrasound guidance may leads to higher overall success rate compared with palpation and landmarks (low certainty).
It is very uncertain whether [Axillary] B‐mode ultrasound guidance changes overall success rate compared with palpation and landmarks (very low certainty).
It is very uncertain whether [Dorsalis pedis] B‐mode ultrasound guidance changes overall success rate compared with palpation and landmarks (very low certainty).
It is very uncertain whether [Radial] B‐mode ultrasound changes overall success rate compared with near‐infrared laser guidance (very low certainty).
[Radial] B‐mode ultrasound showed no clear difference in overall success rate compared with modified B‐mode ultrasound (low certainty).
[Radial] In‐plane B‐mode ultrasound showed no clear difference in overall success rate compared with out‐of‐plane B‐mode ultrasound (low certainty).
It is very uncertain whether [Radial] Dynamic out‐of‐plane B‐mode ultrasound changes overall success rate compared with static out‐of‐plane B‐mode ultrasound (very low certainty).
[Radial] Oblique‐axis in‐plane B‐mode ultrasound may leads to higher overall success rate compared with long‐axis in‐plane B‐mode ultrasound (low certainty).
[Radial] B‐mode ultrasound showed no clear difference in overall success rate compared with doppler assistance (low certainty).
[Radial] Doppler assistance showed no clear difference in overall success rate compared with palpation and landmarks (low certainty).