Abstract：
Of the three common central access sites, subclavian vein catheterization has the lowest risk of infection but the highest risk of pneumothorax. The main disadvantage of the short-axis ultrasound guided approach is difficult needle-tip visualization. We describe use of the hydrolocation technique to improve needle-tip localization.
Two females, an 81-year-old and a 72-year-old, presented for coronary artery bypass grafting requiring central vein cannulation. To confirm that the needle tip was visualized and not the shaft, needle advancement was paused and 1 ml of saline injected. The appearance of a small anechoic pocket superficial to the subclavian vein helped to visualize the needle tip. Negative aspiration was then re-applied and slight advancement resulted in aspiration of blood and successful subclavian vein puncture.
The use of hydrolocation for subclavian vein access was easily implemented, required little modification in setup and technique, and provided improved localization of the needle tip.
Two females, an 81-year-old and a 72-year-old, presented for coronary artery bypass grafting requiring central vein cannulation. To confirm that the needle tip was visualized and not the shaft, needle advancement was paused and 1 ml of saline injected. The appearance of a small anechoic pocket superficial to the subclavian vein helped to visualize the needle tip. Negative aspiration was then re-applied and slight advancement resulted in aspiration of blood and successful subclavian vein puncture.
The use of hydrolocation for subclavian vein access was easily implemented, required little modification in setup and technique, and provided improved localization of the needle tip.
摘要：
在三个常见的中央访问站点中，锁骨下静脉置管感染风险最低,但气胸风险最高.短轴超声引导方法的主要缺点是针尖可视化困难。我们描述了使用水力定位技术来改善针尖定位。
两位女性,81岁和72岁,提出的冠状动脉旁路移植术需要中央静脉插管。为了确认针尖是可视化的，而不是轴，暂停推进针头,并注射1ml生理盐水.锁骨下静脉浅表的小消声袋的出现有助于可视化针尖。然后重新施加阴性抽吸，轻微的前进导致血液抽吸和成功的锁骨下静脉穿刺。
在锁骨下静脉接入中使用水力定位很容易实现，在设置和技术上几乎不需要修改，并提供改进的针尖定位。
两位女性,81岁和72岁,提出的冠状动脉旁路移植术需要中央静脉插管。为了确认针尖是可视化的，而不是轴，暂停推进针头,并注射1ml生理盐水.锁骨下静脉浅表的小消声袋的出现有助于可视化针尖。然后重新施加阴性抽吸，轻微的前进导致血液抽吸和成功的锁骨下静脉穿刺。
在锁骨下静脉接入中使用水力定位很容易实现，在设置和技术上几乎不需要修改，并提供改进的针尖定位。
