“…Three stellate ganglion blocks at weekly intervals have been shown to improve pain and range of motion in patients with CRPS of the upper extremity. 25 Nonetheless, a Cochrane Review determined that existing data regarding stellate blocks for CRPS were of low quality and no conclusions could be drawn. 26 Formal surgical sympathectomy, an extension of the same treatment principle, has shown benefit in select cases, but response to stellate blockade did not predict outcome after sympathectomy.…”