"Sympathectomy is a technique about which we have limited knowledge, applied to disorders about which we have little understanding." Associate Professor Robert Boas, Faculty of Pain Medicine of the Australasian College of Anaesthetists and the Royal College of Anaesthetists

http://www.pfizer.no/templates/Page____886.aspx

Surgical procedure advertised as 'reversible' is not reversible

a recent consensus statement by the Society of Thoracic Surgeons recommended that the clipping method should be considered irreversible as the clipped nerve might not be able to recover after the removal of clips [6].
Ann Thorac Surg 2011;91:1642-8.

extreme case of compensatory truncal hyperhidrosis and anhidrosis over the head and neck region which led to a heatstroke

Thoracic sympathectomy is a commonly performed surgical procedure for the treatment of palmar hyperhidrosis. However, one major complication of such a procedure is compensatory truncal hyperhidrosis. We describe an extreme case of compensatory truncal hyperhidrosis and anhidrosis over the head and neck region which led to a heatstroke.
http://icvts.oxfordjournals.org/content/early/2011/12/20/icvts.ivr121.abstract?sid=89a2ce71-1ea3-4573-9e63-17329e7c09cd