Palmar hyperhidrosis treated by noninvasive ultrasound stellate ganglion block.

Focal palmar hyperhidrosis is a common and often debilitating eccrine sweat gland disorder with negative impact on quality of life and self-esteem. For treatment of recalcitrant cases, a stellate ganglion block is a nonsurgical alternative. Although this method has only a temporary effect, surgical risks can be avoided. The usual way to perform the block is by ultrasound-guided injection of local anesthetics. Here we describe the use of therapeutic ultrasound at 0.8 MHz for stellate ganglion block. Ultrasound was applied for 1 min unilaterally every other day for 6 days. The efficacy was monitored by video capillaroscopy and Minor's iodine starch test. Treatment was well tolerated and no adverse effects were noted. Sweating was stopped and capillary blood flow increased. The effect lasted for several weeks.