In order to determine the effect of Valsalva maneuver and head rotation on
the internal jugular vein (IJV) diameter and cross-sectional area and overlap with
the carotid artery (CA) and find the best technique for safe cannulation of the IJV
and decrease the risk of CA puncture, the diameter of both the IJV and the CA
and percentage of overlap between the two vessels and cross-sectional are...
