The objective of this study was to identify the factors that complicate the needle visualization in ultrasound-guided in-plane needling procedures. Forty-nine residents were recruited and randomized to insert the simulated blood vessel with four different views including Neutral (the long axis of the probe along the visual axis and the ultrasonic beam vertical to the surface of gel phantom), 45°-rotation (45° angle between the long axis of probe and the operator’s visual axis), 45°-tilt (45° angle between the ultrasonic beam and the surface of gel phantom) and 45°-rotation plus 45°-tilt of probe. Number of needle redirections, insertion time, and needle visibility were documented and compared for each procedure. When the residents faced with 45°-tilt view, the needle redirections (2 vs 0) and insertion time increased significantly (39 vs 16) compared with that of the Neutral view. When faced with 45°-rotation plus 45°-tilt view, the residents’ performance decreased further as compared with that of the 45°-tilt view and the Neutral view. However, there was no performance difference between the Neutral view and 45°-rotation view. In conclusion, during ultrasound-guided in-plane procedures, tilting the ultrasound probe may increase the difficulty of needle-beam alignment.

本研究的目的是确定在超声引导的平面针刺程序中使针头可视化复杂化的因素。招募 49 名住院医师并随机插入模拟血管，四种不同的视图包括 Neutral（探头长轴沿视轴，超声波束垂直于凝胶体模表面）、45°旋转（45 ° 探头长轴与操作者视轴之间的角度）、45°倾斜（超声波束与凝胶体模表面之间的 45° 角）和 45° 旋转加上探头的 45°倾斜。记录并比较每个程序的针头重定向次数、插入时间和针头可见性。当住院医师面对 45°倾斜视图时，针头重定向（2 vs 0）和插入时间显着增加（39vs 16) 与中性观点相比。当面对45°旋转加45°倾斜视图时，与45°倾斜视图和中性视图相比，居民的表现进一步下降。但是，中性视图和 45° 旋转视图之间没有性能差异。总之，在超声引导的平面手术过程中，倾斜超声探头可能会增加针束对准的难度。