Effects of ipsilateral tilt position on the cross-sectional area of the subclavian vein and the clinical performance of subclavian vein catheterization: a prospective randomized trial

摘要

In stage I, the patients were placed in all three different positions without Trendelenburg positioning, but in a random order: a the supine position, b the ipsilateral tilt position with a 20° angle, c the contralateral tilt position with a 20° angle