The Comparison of Sympathetic Blockade of Stellate Ganglion Block and Thoracic Paravertebral Block

Inclusion Criteria: * Clinical diagnosis of complex regional pain syndrome * Clinical diagnosis of postherpetic neuralgia * Clinical diagnosis of phantom limb pain * Clinical diagnosis of chronic post-surgical pain * Clinical diagnosis of post-traumatic pain syndrome * Upper extremity pain lasting more than 3 months Patients with a new or known diagnosis of chronic neuropathic pain lasting more than 3 months in the upper extremity Exclusion Criteria: * Refusal of a patient * Any vascular disease in the upper extremities * Previous history of thoracic sympathetic or stellate ganglion neurolysis (e.g. -thermocoagulation, radiofrequency neuromodulation, and/or chemical neurolysis) * Coagulopathy * Systemic infection or local infection at the needle injection site * Major deformation at the level of the neck (radiotherapy, surgery, etc.) * Known allergy to local anesthetics of amide type * Inability to understand a numeric rating pain scale (cognitive dysfunction) * Patients whose palm temperature on the ipsilateral side is ≥ 36.5℃ in the thermography before the procedure