decreased brain metabolism, rather than an increased intracranial pressure, is the cause of decreased cerebral blood flow after superior cervical sympathetic ganglionectomy

"The reduced brain metabolism and consequently reduced cerebral perfusion in the late 

postsympathectomy period could account for reduction in CSF production (Bering3)."

"In support of the above statement we mention that on the late postsympathectomy (11 to 24 months) group of dogs besides the lowered CBF 

(31.36 ml/100 gm brain weight/minute) and MCP (79.3 mm NS) also a lowered MVP (46.5 mm NS) was found. These data indicate that cervicalsympathectomy has a profound and intricate effect on the dynamics of cerebrovascular fluids and probably, in the background of all observedphenomena, a decreased cerebral metabolism as a sympathectomy effect is the underlying cause. Correspondingly the cerebral metabolic rate ofoxygen (CMR O2) decreased to 2.94 and 2.43 ml of O2/IOO gm brain weight/ minute in the sympathectomized groups." 

"Decreased brain metabolism, rather than an increased intracranial pressure, is the cause of decreased cerebral blood flow after superior 

cervical sympathetic ganglionectomy."

http://archsurg.ama-assn.org/cgi/content/summary/90/3/418

Surgical sympathectomy produces most of the retinal changes noted in the retina of an STZ-treated rat in a non-diabetic rat

Sympathectomy significantly increases gene and protein expression of iNOS, as well as levels of PGE2 and protein expression of PGE2-EP2 receptor subtype. Isoproterenol treatment for 6 h to human retinal endothelial cells grown in high glucose medium reduced iNOS protein expression, but had no effect on PGE2 levels or PGE2 receptor protein expression. iNOS expression was attenutated by stimulation with xamoterol, while BRL37344 had no effect, suggesting that the iNOS effects are mediated by beta1-adrenergic receptors. These results suggest that loss of sympathetic activity, as occurs in diabetes, results in an upregulation of iNOS and PGE2-EP2 receptor protein expression, as well as PGE2 levels. Isoproterenol stimulation of human retinal endothelial cells cultured in a hyperglycemic environment decreased iNOS expression with no change in PGE2 levels, suggesting that only iNOS expression is modulated by sympathetic neurotransmission in endothelial cells. Overall, these results further the idea that alterations in sympathetic neurotransmission may result in many of the changes noted in the retina of the STZ-treated rat.
http://www.ncbi.nlm.nih.gov/pubmed/17067575

CERVICAL SYMPATHECTOMY AND CEREBROSPINAL FLUID PRESSURE: THEIR RELATIONSHIP TO BRAIN METABOLISM

http://www.ncbi.nlm.nih.gov/pubmed/14247422

Factors Affecting Cerebral BloodFlow- Experimental Review: 

Sympathectomy, Hypothermia, CO2 Inhalation and Pavarine 

The cerebral spinal fluid pressure increased significantly (86.86to 117.34) immediately after operation but returned to normalwithin 2 weeks.

Ann Surg. 1966 May;163(5):771-7.

Shackelford RT, Hegedus SA.

PMID: 5930460 [PubMed - indexed for MEDLINE]PMCID: PMC1477179

Effects of increased cerebrospinal fluid pressure on the blood flow and on the energy metabolism of the brain. An experimental study.

Zwetnow NN.

PMID: 4316893 [PubMed - indexed for MEDLINE]

http://www.ncbi.nlm.nih.gov/pubmed/4316893
Acta Physiol Scand Suppl. 1970;339:1-31

Surgical Denervation of Ocular Sympathetic Afferents Decreases Local Transforming Growth Factor-β and Abolishes Immune Privilege

Mounting evidence points to a role for the sympathetic nervous system in suppressing inflammation. This role might be of specific relevance for immune privilege in the eye, where, sporadically, patients with denervated sympathetic fibers develop chronic inflammation.

Our results show that in the absence of functional sympathetic fibers, the eye loses its ability to prevent either the immune rejection of intraocular allogeneic tumor cells or the suppression of delayed type hypersensitivity responses against soluble antigens injected in the anterior chamber. This loss of immune privilege is accompanied by a decrease in the concentration of transforming growth factor-β in the aqueous humor. These results suggest that immune privilege is lost in the absence of a functional sympathetic innervation of the eye, allowing intraocular immune responses to become exaggerated. We conclude that ocular sympathetic nerves are critical for the generation and maintenance of immune privilege in the eye through the facilitation of local transforming growth factor-β production.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2731140/

Chemical sympathectomy leads to lowering of aqueous humor production

GRAEFE'S ARCHIVE FOR CLINICAL AND EXPERIMENTAL OPHTHALMOLOGY

Volume 200, Number 3, 223-226, DOI: 10.1007/BF01028537

Cervical sympathectomy causes photoreceptor-specific cell death in the rat retina

Changes in the regulation of the vasculature of the eye may be related to some age-related ocular diseases. We have previously shown that loss of sympathetic innervation, as can normally occur with age, resulted in substantial vascular growth of the choroid. The current study was designed to determine whether changes induced by sympathetic denervation causes significant loss of photoreceptors and increased glial cell reactivity in the retina. Sympathetic denervation was performed followed by immunohistochemistry, TUNEL staining, and protein expression analysis to investigate photoreceptor loss. There was a significant reduction (30%) in photoreceptor numbers in the sympathectomized eye. This loss was due to apoptosis, as there was over a doubling in apoptotic cell numbers after sympathectomy. This loss of photoreceptors in the sympathectomized eye resulted in a significantly reduced width of the outer nuclear layer of the retina when compared to the contralateral eye. Increased glial fibrillary acidic protein (GFAP) staining was also noted after sympathectomy in the ganglion cell layer with streaking toward the bipolar cell layer. These results suggest that loss of sympathetic innervation may cause significant changes to the physiology of the choroid.

Autonomic Neuroscience
Volume 120, Issues 1-2, 15 June 2005, Pages 46-51 

morphological changes in the retina noted after sympathectomy

Results: Mice treated with PDGF inhibitor AG 1296 showed an inhibition of corneal neovascularization and a reduction of pericytes in the new formed vessels compared to untreated animals. 

Retina from sympathectomized eyes receiving saline treatment had significantly  reduced PEDF mRNA and protein expression relative to the contralateral eye receiving saline treatment. These results are similar to previous work and indicate that injection alone did not alter the results. Intravitreal PEDF administration to sympathectomized eyes returned both mRNA and protein levels to those of the contralateral eye. PEDF administration also normalized retinal morphometry to prevent the sympathectomy-induced increases 

in capillary density of the outer plexiform layers, as well as the ganglion cell layer. 

Conclusions: These results suggest that one injection of PEDF can restore protein and mRNA 

levels to those noted in an untreated animal. Furthermore, these results also indicate that 

one injection of PEDF can reverse the morphological changes noted after sympathectomy 

in the retina. 

CR:  J.J. Steinle,  B.L. Lashbrook,

files.abstractsonline.com/SUPT/25/1421/SessionPDF/119.pdf

We disagree that surgery and botulinum toxin are treatments of choice in severe cases of hyperhidrosis

The truth is exactly the opposite. Surgery is only rarely necessary, and the editorial quite properly warns of numerous surgical pitfalls, which include recurrence of hyperhidrosis, almost certain impotence, compensatory sweating, permanent neurological damage from anoxia, and death (their words). Botulinum toxin, which they recommend for axillary or plantar hyperhidrosis, requires 12 injections per axilla and 24-36 injections per foot. Even this horrendous procedure gives only 11 months' relief, and antibody formation may reduce long term efficiency.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1118569/

Iontophoresis should be tried before other treatments

Iontophoresis is easy to perform, effective in about 90% of patients in two studies with 54 and 30 participants, free of hazardous side effects, and well accepted by almost all patients.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1118569/

the Kuntz nerve played no part in the success or failure of ETS surgery

If you research the topic of ETS, you will come across various claims and counter-claims
about the importance or otherwise of the Kuntz nerve. The Kuntz nerve is a small nerve
fibre sometimes seen on the second rib not far from the main sympathetic chain. Its
function is not known in humans. Some web-sites on ETS claim success rates of up to
100% for facial blushing because they search for and destroy the Kuntz nerve(s). These
same people also claim to be able to correct failed ETS operations by reoperating and
destroying the Kuntz nerve.
At the meeting of the International Society for Sympathetic Surgery in Germany, May
2003, attended by a majority of the world’s experts in ETS surgery (including us), all but
one of the surgeons present were of the opinion that the Kuntz nerve played no part in the
success or failure of ETS surgery for facial blushing. We share this majority opinion.
www.lapsurgeryaustralia.com.au

"Sympathectomy is a technique about which we have limited knowledge, applied to disorders about which we have little understanding."

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

diabetic autonomic neuropathy is due to a lesion of the sympathetic nerve supply to the skin

"We conclude that the diabetic anhidrotic syndrome, a form of diabetic autonomic neuropathy, is due to a lesion of the sympathetic nerve supply to the skin."

Diabetologia

Volume 22, Number 2, 96-99, DOI: 10.1007/BF00254836

 

Sympathectomy IS a (surgically caused) lesion of the sympathetic nerve supply to the skin (and other structures)

In 70 % compensatory sweating severe, recurrence rates were 15% and 19% at 1 and 2 years after surgery

In T2 and T3 resection, all patients experienced Compensatory Sweating and over 70% of the patients felt it was severe. Even in T2 resection, 90% of patients experienced CS and in 50% of these it was severe. High rates of CS are reported in Asian countries with hot and humid climates.

In T2 resection, recurrence rates were 15% and 19% at 1 and 2 years after surgery.It was not rare for a patient to experience recurrence more than 3 years after surgery.
Motoki Yano, MD, PhD and Yoshitaka Fujii, MD, PhD

Volume 138, Issue 1, Pages 40-45 (July 2005)

The results of endoscopic sympathectomy deteriorate progressively from the immediate outcome

British Journal of Surgery ISSN 0007-1323

1999, vol. 86, no1, pp. 45-47 (12 ref.)

a strong association of autonomic dysfunction and impaired cerebral autoregulation

Furthermore, we found a strong association of autonomic dysfunction and impaired autoregulation indicated by a correlation between the LF/HF ratio and Sx (p < 0.001).

Drug and Alcohol Dependence
Volume 110, Issue 3, 1 August 2010, Pages 240-246

After sympathectomy for hyperhidrosis, very severe discomfort and hyperhidrosis occurred with alarming frequency and intensity

"After thoracoscopic sympathectomy for hyperhidrosis, very severe discomfort and hyperhidrosis in the neighboring non-sympathectomized regions occurred with alarming frequency and intensity."
(p.879)

Cousins and Bridenbaugh's Neural Blockade in Clinical Anesthesia and Pain Medicine by Michael J Cousins, Phillip O Bridenbaugh, Daniel B Carr, and Terese T Horlocker
Wolters Kluwer Health
Edition: 4 - 2008

Conditions arising after Sympathectomy

After stellate ganglion blockade: HORNER'S SYNDROME

• Drooping eyelid
• Constricted pupil (impaired vision in low light)
• Absent/reduced sweating one side of the face and head
• Redness of eyes
• Facial flushing
  

After regional sympathectomy: DUMPING SYNDROME:

• Rapid emptying of the stomach: lower end of small intestine fills too quickly
• Early dumping: nausea/vomiting/bloating/diarrhoea/shortness of breath
• Late dumping: 1-3 hours after eating: weakness/sweating/dizziness
• Both types may co-exist.

http://www.theaword.org/index.php?option=com_content&view=article&id=223:conditions-arising-after-sympathectomy&catid=84:the-sympathetic-nervous-system&Itemid=41

cervical ganglionectomy produces a significant reduction in the noradrenergic innervation of ip- silateral extraparenchymal arteries

Immediately following experimentation the cerebral vessels were examined
for the presence of noradrenergic fibers. The results of the study demonstrate that:
(1) superior cervical ganglionectomy produces a significant reduction in the noradrenergic innervation of ipsilateral extraparenchymal arteries;
(2) the peripheral sympathetic nervous system contributes to overall cerebral vascular resistance primarily by affecting resistance in extraparenchymal arteries; and
(3) as a result, it determines the contribution of the extraparenchymal arteries tooverall cerebral blood flow autoregulation.
1975;6;284-292 Stroke

Bilateral sympathectomy produced fatal heart block in a few of their experiments

Mendlowitz. Schauer, and Gross⁴ pointed out that the heart rate became slower after removal of the sympathetic chain, but this bradycardia was only temporary. Bilateral sympathectomy produced fatal heart block in a few of their experiments.

American Heart Journal
Volume 22, Issue 4, October 1941, Pages 545-548

bradycardia and other cardiac complications are common side effects?

The most common side effects of sympathectomy are compensatory sweating, gustatory sweating and cardiac changes including decreasing heart rate, systolic-diastolic and mean arterial pressure. The mechanism of bradycardia and other cardiac complications that develop after thoracic sympathectomy are still unclear.

http://tipbilimleri.turkiyeklinikleri.com/abstract_54802.html

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

Surgical sympathectomy listed as neurologic disorder

Other neurologic disorders
- Idiopathic orthostatic hypotension
- Multiple sclerosis
- Parkinsonism
- Posterior fossa tumor
- Shy-Drager syndrome
- Spinal cord injury with paraplegia
- Surgical sympathectomy
- Syringomyelia
- Syringobulbia
- Tabes dorsales (syphillis)
- Wernicke's encephalopathy
Dizziness: Classification and Pathophysiology
The Journal of Manual and Manipulative Therapy, Vol. 12, No 4 (2004)

Sympathectomy limits blood flow to a vital organ like the brain

However, sympathetic blockade at the level of the neck eliminated the beta-1 blockade induced attenuation in delta MCA V(mean) (10.2 2.5 cm s(-1)). These results indicate that a reduced ability to increase CO during exercise limits blood flow to a vital organ like the brain and that this flow limitation is likely to be by way of the sympathetic nervous system.

PMID: 10971220 [PubMed - indexed for MEDLINE]
1. Acta Physiol Scand. 2000 Sep;170(1):33-8.

GAP-43 mRNA and calcitonin gene-related peptide mRNA expression in sensory neurons are increased following sympathectomy

Sympathectomy has been shown to result in an increased density of fibers immunoreactive for sensory peptides in peripheral targets innervated by both sensory and sympathetic neurons, providing evidence for functional interactions between sympathetic and sensory systems. These findings provided the background for examining the hypothesis that axonal outgrowth is induced from sensory neurons following sympathectomy. We examined the expression of GAP-43 mRNA, a specific marker for axonal outgrowth, in cervical (C3, C7, C8) and thoracic (T1, T2) dorsal root ganglia (DRG) of the rat following bilateral removal of the superior cervical ganglion, to assess whether the described increases in peptidergic afferent fibers reflected axonal outgrowth. In situ hybridization was used with ³⁵S labeled riboprobes complementary to GAP-43 mRNA, and to calcitonin gene-related peptide (CGRP) mRNA, a marker for a major subset of thin-fiber sensory neurons. The density of GAP-43 mRNA nearly doubled by 18 h following sympathectomy and reached a threefold increase by 3 days. By 45 days following surgery, the GAP-43 mRNA level was still nearly twice that of normal animals. CGRP immunoreactivity was also examined: the density of fibers in the iris and cornea of sympathectomized animals was considerably greater from two weeks to 45 days following surgery, than in sham-operated controls. Concomitantly, there was a slight but significant increase in CGRP mRNA expression in T1 and C3 DRG 14 days post

http://www.refdoc.fr/Detailnotice?idarticle=15110598

anatomic variations of the T2 nerve root

6 (9.1%) sides showed a single large ganglion formed by the stellate and the second thoracic sympathetic ganglia. The second thoracic sympathetic ganglion was most commonly located (50%) in the second intercostal space. Conclusion: The anatomic variations of the intrathoracic nerve of Kuntz and the second thoracic sympathetic ganglion were characterized in human cadavers.

Journal of thoracic and cardiovascular surgery Y. 2002, vol. 123, No. 3, pages 498-501 [bibl. : 14 ref.

http://www.refdoc.fr/Detailnotice?idarticle=9466218

immune privilege is lost in the absence of a functional sympathetic innervation of the eye

Mounting evidence points to a role for the sympathetic nervous system in suppressing inflammation. This role might be of specific relevance for immune privilege in the eye, where, sporadically, patients with denervated sympathetic fibers develop chronic inflammation. The present study used mice to investigate whether the robust innervation of intraocular structures by the sympathetic system plays a role in maintaining ocular immune privilege. We first performed surgical removal of the superior cervical ganglion, which supplies sympathetic fibers to the eye, and studied the immune response generated against soluble antigens or allogencic tumor cells injected into the ocular anterior chamber under these conditions. Our results show that in the absence of functional sympathetic fibers, the eye loses its ability to prevent either the immune rejection of intraocular allogeneic tumor cells or the suppression of delayed type hypersensitivity responses against soluble antigens injected in the anterior chamber. This loss of immune privilege is accompanied by a decrease in the concentration of transforming growth factor-β in the aqueous humor. These results suggest that immune privilege is lost in the absence of a functional sympathetic innervation of the eye, allowing intraocular immune responses to become exaggerated. We conclude that ocular sympathetic nerves are critical for the generation and maintenance of immune privilege in the eye through the facilitation of local transforming growth factor-β production.
http://cat.inist.fr/?aModele=afficheN&cpsidt=21889071

Results of life-style surgery:

The rate of compensatory sweating in group 2 (72.7%) was significantly lower than in group 1 (95.4%) (P<0.039). The chance of embarrassing and disabling compensatory sweating was lower in group 2 than in group 1; 76.5% (embarrassing in 8 patients, disabling in 9) in group 1, and 36.4% (embarrassing in 7 patients, disabling in 1) in group 2 which was statistically significant (P<0.006).

http://www.ejcts.ch/cgi/content/full/26/2/396

Sympathectomy is used to treat various conditions, including Raynaud's. But is it effective?

"Recurrent and enhanced vasoconstrictor function 3 months following endoscopic sympathetic block has major implications for its use to treat enhanced vasoconstriction."

http://www.ncbi.nlm.nih.gov/pubmed/12796529

bilateral ETS causes the suppression of cardiovascular response to exercise

HR and BP at rest and cardiovascular response to exercise were similar in patients with palmar hyperhidrosis before ETS and in the normal control population. Therefore, we consider that patients with palmar hyperhidrosis have no overactivity of the sympathetic nerve. However, because bilateral ETS causes the suppression of cardiovascular response to exercise, patients that has been treated with ETS need to be observed during high-level exercise.

http://iars.org/abstracts/browsefile/browse.asp?command=N&absnum=45&dir=S190

Undisclosed side-effects of ETS procedure

After a mean of 123 mo 36 patients could be re-evaluated. Eighteen patients (50%) were free from former symptoms, while sequels were still present in 18 patients (50%).

Numbness and paresthesia are rarely reported in the literature but are present in up to 10% of patients 1 year after a thoracoscopic procedure [2,9]. It is known that numbness and dysesthesia may decrease by time, but long-term results are not known.

Early postoperative sequels are frequently found in VATS procedures, but patients with pain even after years have a nearly 50% chance to eliminate their problems. In addition, numbness and dysesthesia seem to disappear almost completely several years after the procedure.

http://www.ejcts.ch/cgi/content/full/32/3/409

Sympathotomy Instead of Sympathectomy for Palmar Hyperhidrosis: Minimizing Postoperative Compensatory Hyperhidrosis

http://www.mayoclinicproceedings.com/content/78/2/167.refs

Mia: An elective surgical procedure enthusiastically declared "almost miraculous" needs modifications to reduce severe side-effects?

CNS activation following peripheral sympathectomy

Many studies have demonstrated that ablation of the sympathetic nervous system (SNS) alters subsequent immune responses. Researchers have presumed that the altered immune responses are predominantly the result of the peripheral phenomenon of denervation. We, however, hypothesized that chemical sympathectomy will signal and activate the central nervous system (CNS).

Dual-antigen labeling demonstrates that

corticotrophin releasing factor (CRF)-containing neurons in the PVN are

activated by chemical sympathectomy; however, neurons containing

neurotransmitters which may modulate CRF neurons, such as vasopressin,

tyrosine hydroxylase, and adrenocorticotropin, do not coexpress Fos. Our

findings suggest an involvement of the CNS insympathectomy-induced

alterations of immunity.

Brain, Behavior, and Immunity

Volume 12, Issue 3, September 1998, Pages 230-241

Cervical sympathectomy affects the lower extremities, providing further evidence that the effects of this procedure is not local or limited

Bilateral cervical sympathectomy reduced mechanical allodynia and cold allodynia in the rat

model of neuropathic pain suggesting that neuropathic pain, although the lesions are localized in low extremities, may be correlated with functional disturbance of sympathetic nerve fibers of supraspinal or brain level and help explain the mechanism of neuropathic pain.

Korean J Anesthesiol. 1999 Feb;36(2):327-334. Korean.

Effect of cervical sympathectomy and circulatory hypoxia on time course of prostaglandin concentration in brain tissues

http://www.springerlink.c...ontent/j705306763158841/

Some workers suggest a possible "transmembrane" role of PG in the nervous system.

If the increase in the PG level during ischemia is regarded as a protective reaction, it must be admitted that no increase took place 1 day after CSE (cervical sympathectomy) and it was considerably weakened 7-40 days after CSE.

The effect of cerebral ischemia was virtually indistinguishable from the action of CSE itself.

It can be tentatively suggested that PGF plays the main role in the regulation of tone of the vascular wall and in the regulation of metabolism under conditions of ischemia when the sympathetic regulation is disturbed.

Correlation between Changes in Regional Cerebral Blood Flow and Pain Relief in Complex Regional Pain Syndrome Type 1

Clinical Nuclear Medicine:

June 2006 - Volume 31 - Issue 6 - pp 317-320

Objective: Analyzing changes in regional cerebral blood flow (rCBF) with SPECT in complex regional pain syndrome type 1 (CRPS 1), formerly known as reflex sympathetic dystrophy, is an optimal method for evaluating effective pain relief. We attempted to investigate the correlation of changes in rCBF with pain relief during treatments of sympathetic blockade and multimodal epidural pain control.

Case Report: We describe a patient with severe CRPS 1 in whom conventional treatment failed to relieve the pain.

Combined repeated lumbar sympathetic blocks and long-term epidural morphine, bupivacaine, and ketamine administration provided satisfactory pain relief and functional activity recovery. Six normal control subjects having one Tc-99m HMPAO scan each and the patient with CRPS having 3 Tc-99m HMPAO scans (once before treatment and twice at 4 months and 6 months after treatment, respectively). The patient with CRPS showed lower rCBF than normal

controls in the left thalamus and higher rCBF than normal controls in the right parietal lobe and left frontal lobe.

After subsequent treatment, the subtraction images showed increased rCBF in the left thalamus and decreased rCBF in the right parietal and left frontal lobes.

Conclusions: Tc-99m HMPAO SPECT showed a relationship of rCBF in the thalamus, parietal lobe, and frontal lobe with pain relief. rCBF alterations may provide an indicator for the quality of pain management for neuropathic pains.

Subtraction analysis between pre- and posttreatment, by using statistical parametric mapping (version 2), can be used as an objective indicator for the effectiveness of therapy.

Effect of cervical sympathectomy and circulatory hypoxia on time course of prostaglandin concentration in brain tissues

http://www.springerlink.c...ontent/j705306763158841/

Some workers suggest a possible "transmembrane" role of PG in the nervous system.

If the increase in the PG level during ischemia is regarded as a protective reaction, it must be admitted that no increase took place 1 day after CSE (cervical sympathectomy) and it was considerably weakened 7-40 days after CSE.

The effect of cerebral ischemia was virtually indistinguishable from the action of CSE itself.

It can be tentatively suggested that PGF plays the main role in the regulation of tone of the vascular wall and in the regulation of metabolism under conditions of ischemia when the sympathetic regulation is disturbed.

Effects of Sympathectomy on Muscle

We have previously reported functional and histological studies in five beagle dogs with unilateral lumbar sympathectomy. Three months later, fatiguability in the gracilis muscles was increased on the denervated sides, and this was associated with an increase in the relative distribution of FT fibres. Biochemical studies now show that these changes were associated with an increase in cytosolic protein without change in DNA content; this is consistent with
an increase in cell size. There was a reduction in the proportion of slow myosin light chain isoforms from 50 ± 7 to 34 ± 6%. Noradrenaline levels were increased on the denervated sides but this may reflect greater vascularity. Calcium content did not correlate with fibre type but there was a positive relation with both noradrenaline content (r= 0·73;
P<0·05) and DNA content (r= 0·84; P<0·05). It is concluded that sympathectomy induces several biochemical changes in skeletal muscle which constitute a change and increase in fast myosin light chain synthesis and a corresponding fibre type transformation.

Clinical Physiology (Oxford, England) 1988 Apr; vol 8 (issue 2): pp 181-91

2.
The objective of this paper was to study the effect of sympathetic innervation on morphological and histochemical aspects of skeletal muscle tissue. Rabbit masseter muscle was studied using histochemical and immunohistochemical methods for periods of up to 18 months post-sympathectomy. The morphological and enzymatic characteristics of control masseter muscles were similar on both the left and right sides. The main features were muscle fibres with a mosaic pattern and a predominance of type IIa fibres, followed by type I. Type IIb fibres showed very low frequency. Sympathectomized animals showed varying degrees of metabolic and morphological alterations, especially 18 months after sympathectomy. The first five groups showed a higher frequency of type I fibres, whilst the oldest group showed a higher frequency of type IIb fibres. In the oldest group, a significant variation in fibre diameter was observed. Many fibres showed small diameter, atrophy, hypertrophy, splitting, and necrosis. Areas with fibrosis were observed. Thus cervical sympathectomy induced morphological alterations in the masseter muscles. These alterations were, in part, similar to both denervation and myopathy.

International Journal of Experimental Pathology
Volume 82, Issue 2, pages 123–128, April 2001