Comparison of ultrasound-guided stellate ganglion block at 6th and 7th cervical vertebrae using the lateral paracarotid out-of-plane approach for sympathetic blockade in the upper extremity.

The lateral paracarotid approach using out-of-plane needle insertion for ultrasound-guided SGB performed at C7 was feasible and more effective at elevating skin temperature in the upper extremity than SGB at C6.