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Background/Purpose: The right internal jugular vein (RIJV) is the most commonly accessed central venous site in the cardiac operating room. The Trendelenburg position is frequently used to increase the cross-sectional area (CSA) of the RIJV to facilitate its cannulation. However, the extent of change of RIJV CSA in response to Trendelenburg positioning in anesthetized patients and its predictive factors remain unknown. Methods: Thirty-seven patients presented for the cardiac surgery, and 20 ASAdoi:10.4236/wjcs.2013.32005 fatcat:riccub6t2nahvkk4dilkk4miyy