Fig. 2

Transducer position and corresponding ultrasound image of the stellate ganglion block (SGB). A Performance of the SGB using transverse scanning with needle in-plane approach. B Ultrasound images for the SGB. The internal jugular vein was compressed (blue circle); the yellow line represents the prevertebral fascia, and the red arrow indicates the in-plane needle path. LC longus colli, SCM sternocleidomastoid muscle, LA local anesthetic, Th thyroid gland, CA carotid arter, AT anterior tubercle of C6 transverse process, VB C6 vertebral body