IRCT2012081410599N1 IRCT 2015-01-30 Vice chancellor for research, Iran University of Medical Sciences Upper extremity pain management with stellate ganglion block Clinical trial of Comparison of effectiveness of stellate ganglion block under the guidance of fluoroscopy and ultrasonography guidance in upper extremity complex regional pain syndrome 2014-09-23 anticipated 14 Complete https://irct.ir/trial/11061 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment. 0 (exploratory trials) Upper Extremities Complex regional pain syndrome. Intervention 1: Flouroscopic guide stellate ganglion block: After select the patient with block randomization method, first put the C-ARM in AP view and specify the C6 or C7 vertebra. The desired location is the junction between the transverse process and the body of C6 or C7 vertebra. Five to 10 cm Needle plug to the extension tube while contact bone occurred. The needle will be positioned at anterolateral to the vertebral body. Longus colli located at lateral to vertebral body and medial to transverse process. Be aware that needle be in contact with the bone to avoid the longus colli injection. If paresthesia will occurred the needle withdrawn and repositioned in another place. Intervention 2: Sono guide stellate ganglion block: After select the patient with block randomization method,the patient is placed in supine position with little head extension to contralateral side . We used the linear high frequency transducer (6-13 mhz) at C6 cervical vertebra. we must see the cutting of the anatomical structures such as the C6 transverse process, longus colli muscle, prevertebral fascia, thyroid gland and carotid artery . The needle might be the path lateral to the carotid artery and is the preferred path.