The authors examined 10 healthy volunteers placed in five different positions for subclavian vein puncture: (1) flat (or supine), head and shoulders neutral;

• 传统上较喜爱头下脚上的姿势以增加血管直径，使空气栓塞的危险减到最低，作者检查了10位健康受试者的五种不同姿势进行琐骨下穿次：（1）平躺（或仰卧），头和肩保持中立；