The amount of compensatory sweating depends on the patient, the damage that the white rami communicans incurs, and the amount of cell body reorganization in the spinal cord after surgery.
Other potential complications include inadequate resection of the ganglia, gustatory sweating, pneumothorax, cardiac dysfunction, post-operative pain, and finally Horner’s syndrome secondary to resection of the stellate ganglion.
www.ubcmj.com/pdf/ubcmj_2_1_2010_24-29.pdf

After severing the cervical sympathetic trunk, the cells of the cervical sympathetic ganglion undergo transneuronic degeneration
After severing the sympathetic trunk, the cells of its origin undergo complete disintegration within a year.

http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0442.1967.tb00255.x/abstract

Tuesday, February 8, 2011

impairment of autoregulation after unilateral cervical sympathectomy

Although these findings argued against a neurogenic mechanism, James at al. (1969) reported impairment impairment of autoregulation after unilateral cervical sympathectomy in the babbon. Gotoh et al. (1971/1972) observed impairment of autoregulation in patients with the Shy-Drager syndrome.
It was concluded that the autonomic nervous system plays an important role in the mechanism of autoregulation of CBF and that his mechanism is independent of the chemical control of the cerebral vessels. This was confirmed by direct observation of the pial vessels in cats, where separate sites of action in the vascular tree for autoregulation and chemical control were demonstrated; the autoregulatory reaction was located in pial arteries with a diameter larger than 50 μ, and the reaction to carbon dioxide in pial arteries of smaller diameter (Gotoh et al. 1975).
They concluded that the arteries operating in autoregualtin were the larger ones with the dense innervation, while the smaller arteries with sparse innervation were involved in chemical control.
Coronna and Plum (1973) demonstrated the absence of CBF autoregulation in a patient with a Shy-Drager syndrome who had a postganglionic denervation....

Gotoh et al (1979) subsequently showed that autoregulation in patients with this syndrome was impaired irrespective of the localization of the damage to the cervical sympathetic nervous system (preganglionic, central, postganglionic) as judged by the eye instillation test.
Handbook of Clinical Neurology,

Vascular Diseases, Part I by P. J. Vinken, G. W. Bruyn, H. L. Klawans, and J. F. Toole
, Volume 53, Part 1
Elsevier Health Sciences, 1988

unavoidable side effects and unforeseeable and unacceptable complications after sympathectomy

Most of the difficulties associated with hyperhidrosis surgery are due to unavoidable side effects and unforeseeable and unacceptable complications. Careful patient selection is important before surgery so surgeons can avoid some of these pitfalls. Patients should also be fully informed of all potential side effects and complications before surgical treatment. 
 http://www.ncbi.nlm.nih.gov/pubmed/18557592

sympathectomy should only be considered after failure of all other treatments

Local surgery (axillary) and endoscopic thoracic sympathectomy (palms and soles) should only be considered after failure of all other treatment options.

A comprehensive approach to the recognition, diagnosis, and severity-based treatment of focal hyperhidrosis : Recommendations of the canadian hyperhidrosis advisory committee
Canada, 2007

There is potentially a number of safety issues associated with this procedure

Australian Review of ETS surgery
"A lack of high quality randomised trial evidence on ETS means that it is difficult to make a judgment on the safety and effectiveness of this technique. There is potentially a number of safety issues associated with this procedure. ASERNIP-s suggests that a full systematic review including all available comparative and case series information, together with clinical inpuut, should be undertaken to provide up-to-date and comprehensive assessment of the safety and effectiveness of ETS." (ASERNIP-s Report No. 71, August 2009)

Reported success stories on ETS are "prone to bias and have significant methodological problems"

Australian Review of ETS surgery - 2001
The four case series were not critically appraised because they are prone to bias and have significant methodological problems. These studies represent level IV evidence according to the NHMRC criteria and one should not draw firm conclusions from their findings.

To date, the benefits or side effects associated with endoscopic thoracic sympathectomy for treating facial blushing have not been properly evaluated and reported.

Further research using a well-designed controlled trial is warranted to assess the efficacy of endoscopic thoracic sympathectomy for treating facial blushing.

Centre for Clinical Effectiveness - Monash

poor* evidence is available about ETS as regards side effects, risks, and short-term effects

Swedish Review
The findings by SBU Alert show that poor* evidence is available about ETS as regards side effects, risks, and short-term effects. There is no* scientific evidence demonstrating the long-term results of the method or its cost effectiveness in relation to other methods.
(Swedish Council on Technology Assessment in Health Care (SBU), the Medical Products Agency, the National Board of Health and Welfare, and the Federation of Swedish County Councils.
Published: 1999-08-30 Revised: 2002-09-30

The intervention leads to severe immediate complications in some of the patients

Finnish Review
Conclusions: The evidence of the effectiveness of ETS is weak due to a lack of randomized trials. The intervention leads to severe immediate complications in some of the patients, and to persistent side-effects for many of the patients.
UniversityofOuluand FinnishOfficeforHealthTechnologyAssessment
FinnishOfficeforHealthTechnologyAssessment
UniversityofHelsinki and FinnishOfficeforHealthTechnologyAssessment
UniversityofCopenhagenand FinnishOfficeforHealthTechnologyAssessment

"Lifestyle" surgical procedure carries unrecognized risk of complications.”

Wiley & Sons, Inc, news release - 2004

"Lifestyle" surgical procedure carries unrecognized risk of complications.”
Hoboken, NJ: John Wiley & Sons, Inc, British Journal of Surgery, Feb 5, 2004

The studies provided very limited evidence that sympathectomy improves blushing, - Wessex Institute for Health Research and Development, University of Southampton 2003: 11

UK Review of ETS surgery
We did not identify any controlled trials or cohort studies. The evidence about effectiveness, based on three case series, was therefore very limited. The main weakness of these studies was their lack of a comparison group and their resulting inability to exclude a placebo response to surgery. In addition, the methods of assessing outcome were poorly described and not validated, and the range of outcomes assessed was limited. The studies provided very limited evidence that sympathectomy improves blushing. Side effects were common.
London: Bazian Ltd (Editors), Wessex Institute for Health Research and Development, University of Southampton 2003: 11

The practice of surgical and chemical sympathectomy is based on poor quality evidence, uncontrolled studies and personal experience

Cochrane Database Syst. Review
”The practice of surgical and chemical sympathectomy is based on poor quality evidence, uncontrolled studies and personal experience.“
Cochrane Database Syst Rev. 2003;(2):CD002918.