Fig. 3From: Comparison of the effect of different degrees of passive leg raising on the internal jugular vein cross-sectional area in patients before thoracic surgeryOverall correlation diagram of the factors related to the IJV CSAScatter plots and a correlation matrix of patients’ weight, height, BMI, gender, age, fasting time, preoperative rehydration and CSA at 0 degrees, 30 degrees, and 50 degrees. Sections with significant correlations are identified using rectangles. IJV, internal jugular vein; CSA, cross-sectional area.Back to article page