Ultrasound-guided SCB
The probe in group S was placed in the supraclavicular fossa to obtain a short-axis view of the subclavian artery. The brachial plexus appeared as a hyperechoic ring closely surrounding the subclavian artery and it formed a low-density grape-like structure. We advanced the puncture needle to the “corner pocket” (the angle between the first rib and the subclavian artery) by using an in-plane insertion technique [