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
