"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

Hemodynamic changes in vertebral and carotid arteries were observed after sympathicotomy for hyperhidrosis



T3 sympathicotomy segment was the most frequent transection done (95.83%), as only ablation (25%) or in association with T4 (62.50%) or with T2 (8.33%). It was observed increase in RI and PI of the common carotid artery (p < 0.05). The DPV of internal carotid artery decreased in both sides (p < 0.05). The SPV and the DPV of the right and left vertebral arteries also increased (p < 0.05). Asymmetric findings were observed so that, arteries of the right side were the most frequently affected.

CONCLUSIONS: Hemodynamic changes in vertebral and carotid arteries were observed after sympathicotomy for PH. SPV was the most often altered parameter, mostly in the right side arteries, meaning significant asymmetric changes in carotid and vertebral vessels. Therefore, the research findings deserve further investigations to observe if they have clinical inferences.
http://www.ncbi.nlm.nih.gov/pubmed/16186983 

Limited heart rate variability, autonomic nervous system imbalance implicated in the aetiology of CFS


The Conversation: "The stress-response neural systems of chronic fatigue syndrome (CFS) patients remain on high alert even when they sleep, signalling that it’s not safe to relax, researchers have found.

Researchers also discovered that reduced heart rate variability, or changes in heart beat timing, are the best predictors of cognitive disturbances, such as concentration difficulties commonly reported by CFS sufferers. This adds to the growing body of evidence linking autonomic nervous system imbalance to this disorder.

The findings could lead to new ways to improve cognitive difficulties in people with CFS, which remains a poorly understood condition."


ETS result in limited (reduced) heart rate variability and alters the ANS (sympathetic and parasympathetic balance). This article might provide some insight into the cases where ETS resulted in a variety of unwelcome and detrimental side-effects, including fatigue, altered cognitive function ('brain fog'), etc.

No compensatory sweating after botulinum toxin treatment of palmar hyperhidrosis

No compensatory sweating after botulinum toxin... [Br J Dermatol. 2005] - PubMed - NCBI: "Recordings were made at 16 skin areas and compared with subjective estimates of sweating.
RESULTS:
Following treatment, palmar evaporation decreased markedly and then returned slowly towards pretreatment values, but was still significantly reduced 6 months after treatment. No significant increase of sweating was found after treatment in any nontreated skin area.
CONCLUSIONS:
Successful treatment of palmar hyperhidrosis with botulinum toxin does not evoke compensatory hyperhidrosis in nontreated skin territories."

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not exposing patients to the risk of experiencing the side effects of sympathectomy

The use of oxybutynin for treating ... [An Bras Dermatol. 2011 May-Jun] - PubMed - NCBI: "Treatment of facial hyperhidrosis with oxybutynin is a good alternative to sympathectomy, since it presents good results and improves quality of life, in addition to not exposing patients to the risk of experiencing the side effects of sympathectomy."

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rates and characteristics of the paresthesia following needlescopic VATS are similar to those observed after conventional VATS

Incidence of chest wall paresthesia ... [Eur J Cardiothorac Surg. 2005] - PubMed - NCBI: "Paresthetic discomfort distinguishable from wound pain was described by 17 patients (50.0%). The most common descriptions were of 'bloating' (41.2%), 'pins and needles' (35.3%), or 'numbness' (23.5%) in the chest wall. The paresthesia resolved in less than two months in 12 patients (70.6%), but was still felt for over 12 months in three patients (17.6%). Post-operative paresthesia and pain did not impact on patient satisfaction with the surgery, whereas compensatory hyperhidrosis in 24 patients (70.6%) did (P=0.001). The rates and characteristics of the paresthesia following needlescopic VATS are similar to those observed after conventional VATS."

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Nerve injury can result in chronic pain - sympathectomy is a surgical nerve injury


Blocking sympathetic function, whether by surgical sympathectomy, systemic phentol- amine, or systemic guanethidine, relieves partial nerve injury-induced neuropathic pain in laboratory animal models as well as humans (8, 35, 146, 239, 278). Indeed, sympathectomy does not just relieve pathological pain in the body region ipsilateral to the CRPS-initiating event; rather, it also relieves pain arising from anatomically impossible mirror-image sites, that is, the identical body region contralateral to the initiating event (278). Thus sympathetectomy must somehow quiet the contralateral spread of spinal cord hyperexcitability underlying mirror- image pain.
Alterations in sympathetic fibers rapidly follow pe- ripheral nerve injury. This occurs as sprouting of sympa- thetic fibers, creating aberrant communication pathways from the new sympathetic terminals to sensory neurons (35). Sympathetic sprouting has been documented in the region of peripheral terminal fields of sensory neurons (262), at the site of nerve trauma (57), and within the dorsal root ganglia (DRG) containing cell bodies of sen- sory neurons (248, 343). Each of these sites develops spontaneous activity and sensitivity for catecholamines and sympathetic activation (8, 53).
The clearest evidence that immune activation partic- ipates in sympathetic sprouting comes from studies of the DRG. DRG cells receive signals that peripheral nerve injury has occurred via retrograde axonal transport from the trauma site. These retrogradely transported signals trigger sympathetic nerve sprouting into DRG (205, 308). As a result of nerve damage-induced retrogradely trans- ported signals, glial cells within the DRG (called satellite cells) proliferate (248) and become activated (343); mac- rophages are recruited to the DRG as well (63, 176). In turn, the activated satellite glial cells (and, presumably, the macrophages) release proinflammatory cytokines and a variety of growth factors into the extracellular fluid of the DRG (206, 246–248, 258, 277, 308, 358). These sub- stances stimulate and direct the growth of sympathetic fibers, which form basket-like terminals around the satel- lite cells that, in turn, surround neuronal cell bodies (247, 248, 343). For discussion of satellite cell functions, see section IIIA.
LINDA R. WATKINS AND STEVEN F. MAIER
Department of Psychology and the Center for Neuroscience, University of Colorado at Boulder, Boulder, Colorado
Physiol Rev
82: 981–1011, 2002; 10.1152/physrev.00011.2002.

A randomized placebo-controlled trial of oxybuty... [J Vasc Surg. 2012] - PubMed - NCBI

A randomized placebo-controlled trial of oxybuty... [J Vasc Surg. 2012] - PubMed - NCBI: "Palmar and axillary hyperhidrosis improved in >70% of the patients, and 47.8% of those presented great improvement. Plantar hyperhidrosis improved in >90% of the patients. Most patients (65.2%) showed improvements in their quality of life. The side effects were minor, with dry mouth being the most frequent (47.8%).
CONCLUSIONS:
Treatment of palmar and axillary hyperhidrosis with oxybutynin is a good initial alternative for treatment

bilateral sympathectomy may cause bowel, bladder, or sexual dysfunction


If regional sympathetic blockade provides relief, surgical sympathectomy can be considered. Initial pain relief may be significant, but symptoms tend to recur over the next 2 to 5 years.[53] This is believed to occur owing to incomplete surgical removal of all sympathetic innervation to the extremity. Collateral reinnervation can occur, but bilateral sympathectomy may cause bowel, bladder, or sexual dysfunction.[14]

It is possible to disrupt the sympathetic chain ganglion by treatments other than surgery. Ablation with radiofrequency devices and caustic chemicals (such as alcohol) have been described, but the region of necrosis may expand beyond the ganglion and long-term results are unknown.[59,][69] As such, surgical sympathectomy is considered strictly as a last resort.  
Knee Disorders: Surgery, Rehabilitation, Clinical Outcomes By Frank R. Noyes, MD