Fig. 2From: Comparison of the effect of different degrees of passive leg raising on the internal jugular vein cross-sectional area in patients before thoracic surgerySchematic view and sonographic images of the IJV at different PLR positions. a. Supine position. b. 30-degree PLR position. c. 50-degree PLR position. IJV, internal jugular vein; CA, carotid arteryBack to article page