Long-Axis Ultrasound Imaging of the Nerves and Advancement of Perineural Catheters Under Direct Vision: A Preliminary Report of Four Cases

This short case series suggests that long axis imaging of the nerve, the needle, and the catheter allows visualization of a catheter's advancement. Using to-and-fro movements, and slight rotation the needle's bevel, the catheter may be maneuvered under the ultrasound beam, which facilitates correct positioning.