By placing the US (ultrasound) probe perpendicular to the skin at the level of the cricoid cartilage a cross-sectional view of the internal jugular vein (IJV) is obtained. The probe is then moved caudally following the IJV until the junction of the subclavian vein (SCV) and IJV is reached. After that the probe is tilted slightly laterally across the clavicle until a good longitudinal view of the subclavian vein (BCV) beginning at the US shadow of the clavicle to the junction of the IJV and SCV is obtained (SCV-Figure 1) (SCV-Clip1)