ABSTRACT Background/Purpose: The right internal jugular vein (RIJV) is the most commonly accessed central venous sitein 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 ASA I and II surgical patients without a history of cardiac disease (control) were studied. After induction of anesthesia, RIJV CSA was measured both at supine level position and in 10-degree Trendelenburg using vascular ultrasonography. Central venous pressure was measured in cardiac surgery patients only, since the patients in control group did not require invasive lines placement. Results and Conclusions: Body-surface area, central venous pressure, type of surgery and ejection fraction did not show any correlation with the degree of RIJV CSA change. RIJV dilation in response to Trendelenburg was significantly less pronounced, and more variable, in female patients.
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