Sympathectomy increased the pain threshold and made the sympathectomized rats hypesthetic.

Normal adult rats were sympathectomized at L2-L3. The threshold for thermal noxious pain by hot-plate analgesia test and changes in neuropeptides in the lumbar dura mater and dorsal root ganglia using light microscopic immunohistochemistry were assessed and compared with control rats.

Results: In the hot-plate analgesia test, sympathectomized rats increased their hot-plate latency time compared with that of sham-operated rats. Density of calcitonin gene-related peptide immunoreactive fibers in sympathectomy side of the lumbar dura mater decreased to 45.5% compared with the contralateral side. The number and size of calcitonin gene-related peptide immunoreactive cells in dorsal root ganglia showed no difference between sympathectomized and contralateral side.

Conclusion: Sympathectomy increased the pain threshold and made the sympathectomized rats hypesthetic. A large numbers of sensory fibers innervated the lumbar dura mater via L2-L3 sympathetic nerve in rats. Sympathectomy reduced the number of these nerve fibers in the lumbar dura mater. Sympathetic nerves may play an important role for low back pain involving the lumbar dura mater.

http://journals.lww.com/spinejournal/Abstract/1996/04150/An_Anatomic_Study_of_Neuropeptide.4.aspx

Long-term sympathectomy induces sensory and parasympathetic fibres sprouting, and mast cell activation in the rat dura mater

http://discovery.ucl.ac.uk/1330488/

There are similarities between the delayed onset of the human pain state and the delayed rise in sensory peptides after sympathectomy

The effect of sympathectomy on the calcitonin gene-related peptide (CGRP) level in the rat primary trigeminal sensory neurone was investigated. Six weeks after bilateral removal of the superior cervical ganglion there was a 70% rise in the CGRP content of the iris and the pial arteries, a 34% rise in the concentration in the trigeminal ganglion but no change in the brainstem. The CGRP rise in both end organs suggests that this phenomenon may be common to all peripheral organs receiving combined sensory and sympathetic innervations. The lack of any rise in the brainstem CGRP content raises the possibility that this process spares central terminations. In contrast, the level of neuropeptide Y, a peptide mainly contained in sympathetic terminals, fell to 35% of control values in the iris and pial arteries whilst the trigeminal ganglion and brainstem concentrations remained unchanged. The possible relevance of these observations to the clinical syndrome of postsympathectomy pain (sympathalgia) is discussed. There are similarities between the delayed onset of the human pain state and the delayed rise in sensory peptides after sympathectomy.
http://www.ncbi.nlm.nih.gov/pubmed/3877546

sympathectomy resulted in complete disappearance of histochemically detected adrenergic and a considerable decrease of cholinergic nerve fibers in the pial arterial walls

http://www.ncbi.nlm.nih.gov/pubmed/7173422

Digital infrared thermal image after T2 sympathicotomy or T3 ramicotomy

(A) Clear cut change of skin temperature after a T2 sympathicotomy. (B) An even distribution of skin temperature after ramicotomy.

Gossot and colleagues [8] analyzed a group of T2, T3, T4 sympathectomy patients in comparison with a group of patients undergoing a T2, T3, T4 ramicotomy and they reported no statistical difference regarding the incidence of CS between the two groups studied (72.2% and 70.9%). However in terms of the severity of CS (embarrassing, disabling) causing inconveniences to daily life, they reported 27% and 13% incidences in these two groups, respectively. These findings suggest that by preserving the sympathetic trunk, it was possible to reduce the severity of CS.

The preganglionic fibers of the sympathetic nerve to the arm originate mostly from the spinal segments T3–T6 and the postganglionic fibers of the sympathetic nerve to the arm originate from T2 and, to a lesser extent, the T3 ganglia [9]. This implies that the division of preganglionic fibers (rami communicantes) reduces the extent of denervation of the sympathetic nerve as compared with the division of postganglionic fibers (sympathetic trunk) in the treatment of palmar hyperhidrosis.
Sympathectomy or sympathicotomy is one of the procedures used to divide the sympathetic trunk. Sympathicotomy distinctively changes sympathetic nerve distribution in comparison with a ramicotomy. Figure 4A illustrates the clear-cut changes of skin temperature after a T2 sympathicotomy. However the overall sympathetic nerve distribution to the body is not markedly changed after a T3 ramicotomy because a T3 ramicotomy is a procedure that is used to divide one of the preganglionic fibers and to preserve the sympathetic trunk. Figure 4B illustrates an even distribution of skin temperature after T3 ramicotomy.

 http://ats.ctsnetjournals.org/cgi/content/full/78/3/1052#FIG4

Drionic effectively "...reduced sweating for up to 6 weeks..."

Clinical Studies

The following comments are from clinical studies which demonstrated the safety and effectiveness of Drionic:

1. Efficacy of the Drionic unit in the treatment of hyperhidrosis. J Am Acad Dermatol 1987;16:828-832. "...the Drionic unit appears to have a definite place in the treatment of hyperhidrosis." Daniel L. Akins, M.D. John L. Meisenheimer, M.D. Richard L. Dobson, M.D., Professor & Chairman, Dept. of Dermatology From the Department of Dermatology, Medical University of South Carolina, Charleston, South Carolina
   
2. A new device in the treatment of hyperhidrosis by iontophoresis. Cutis 1982;29:82-89. Drionic effectively "...reduced sweating for up to 6 weeks..." Further, the study concluded that "Because of its design, it has great potential for home use." CPT John L. Peterson, M.D. MAJ Sandra I. Read, M.D. COL Orlando G. Rodman, M.D. Chief, Dermatology Service From the Dermatology Service, Dept. of Medicine, Walter Reed Army Medical Center, Washington, DC
3. Tap water iontophoresis in the treatment of hyperhidrosis. Int J Dermatol 26;1987:194-197. "Tap water iontophoresis is a recognized method of reducing sweat in various parts of the body. The Drionic device is a battery-operated method of inducing tap water iontophoresis. This simple device may be used at home and is effective in reducing hyperhidrosis for as long as 6 weeks." Mervyn L. Elgart, M.D., Professor & Chairman, Dept. of Dermatology Glenn Fuchs, M.D. From the Department of Dermatology, George Washington Univ. Medical Center, Washington, DC.
4. Efficacy of the Drionic unit in the treatment of hyperhidrosis. JAm Acad Dermatol 16:828-832, Apr. 1987. Elgart ML, Fuchs G: Tap water iontophoresis in the treatment of hyperhidrosis. Int J Dermatol 26: 194-197, Apr. 1987. (old model)

Informing the patient of the seriousness of the consequences before this operation is absolutely necessary

http://ats.ctsnetjournals.org/cgi/content/full/80/3/1160-a

pathological pain, such as occurs in response to peripheral nerve injury

It is recently become clear that activated immune cells and immune-like glial cells can dramatically alter neuronal function. By increasing neuronal excitability, these non-neuronal cells are now implicated in the creation and maintenance of pathological pain, such as occurs in response to peripheral nerve injury.
http://www.ncbi.nlm.nih.gov/pubmed/17706291

CS is referred to as perilesional hyperhidrosis - the shifting narrative

Central and/or peripheral denervation of large numbers of sweat glands produces increased sweat output in innervated glands, maximal in contiguous dermatomal regions, occurs in PAF, Ross syndrome, SCI and post-surgical sympathectomy. (p.555)

Primer on the Autonomic Nervous System

David Robertson, Italo Biaggioni, Geoffrey Burnstock, Phillip A. Low, Julian F.R. Paton

Academic Press, 01/11/2011 - 730 pages

Sympathectomy, ganglionopathies and myelopathies produce such pattern

Segmental Anhidrosis

This pattern occurs when a large, contiguous body area of sweat loss with sharply demarcated borders conforming to sympathetic or somatic dermatomes are present.
Sympathectomy, ganglionopathies and myelopathies produces such pattern. When borders are not well defined and anhidrosis not contiguous, a regional pattern is said to exist. Both postganglionic and preganglionic lesions may produce these distributions. (p.557)

Primer on the Autonomic Nervous System

 edited by David Robertson, Italo Biaggioni, Geoffrey Burnstock, Phillip A. Low, Julian F.R. Paton

Disorders of sweating - Iatrogenic causes: Surgical sympathectomy/sympathotomy

(p. 558)

Primer on the Autonomic Nervous System

 edited by David Robertson, Italo Biaggioni, Geoffrey Burnstock, Phillip A. Low, Julian F.R. Paton

sympathectomy cannot by direct effect on the muscle vessels either abolish or lessen claudication

http://pmj.bmj.com/content/29/335/459

reductions in heart rate variability are a predictor of sudden cardiac death, even in individuals without a prior history of cardiovascular disease

Research indicates that a highly variable heart rate increases your capacity to respond and adapt to life’s challenges.
In a sense, it makes your cardiovascular system more flexible. If you’re less able to switch to the rest system, you’re more likely to feel stressed because your body is indicating that there’s danger in the environment – even if there isn’t.
Research has shown that reductions in heart rate variability are a predictor of sudden cardiac death, even in individuals without a prior history of cardiovascular disease.

1. Daniel Quintana

   PhD candidate and researcher at University of Sydney
   

2. Andrew Kemp

   NHMRC Career Development Fellow at University of Sydney
   

http://theconversation.edu.au/depression-can-break-your-heart-literally-1102