The Effects of the Trendelenburg Position and Intrathoracic Pressure on the Subclavian Cross-Sectional Area and Distance from the Subclavian Vein to Pleura in Anesthetized Patients

BACKGROUND:The effects of maneuvers to increase intrathoracic pressure and of Trendelenburg position on the cross-sectional area (CSA) of the subclavian vein (SCV) and the relationship between the SCV and adjacent structures have not been investigated.METHODS:In ultrasonography-guided SCV catheteriz