To check hypertension in some cases of nervous origin there is a formidable two-stage operation, sympathectomy: whole series of nerve bundles beside the spine are cut.
For this purpose it is more effective than other drugs, and is a substitute for the surgical operation of sympathectomy.
The operation, called an upper thoracic sympathectomy, is performed by making an incision in the side of the neck and removing those thoracic ganglia (nerve connections) that .