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Microsoft word - neuropathic feb 2012
Neuropathic pain results from damage to, or dysfunction of, the system that
normally signals pain. The International Association for the Study of Pain (IASP
2007) defines neuropathic pain as follows: ‘Pain initiated or caused by a primary
lesion or dysfunction in the nervous system. Peripheral neuropathic pain occurs
when the lesion or dysfunction affects the peripheral nervous system. Central
pain may be retained as the term for when the lesion or dysfunction affects the
central nervous system’. A review of the epidemiology of chronic pain found that
there is still no accurate estimate available for the population prevalence of
neuropathic pain.(Smith and Torrance 2010)
Neuropathic pain is often chronic, and can be severe and difficult to treat.(NICE 2010) The origin of neuropathic pain can be metabolic, inflammatory, infective or neoplastic, or can be due to an injury, compression or infiltration (e.g. by tumour) of peripheral nerves. Various conditions can cause neuropathic pain include diabetic neuropathy, postherpetic neuralgia and trigeminal neuralgia, pain following chemotherapy and HIV infection.
Neuropathic pain is commonly described as burning, stabbing, stinging, shooting, aching or electric shock-like in quality.(Sykes 1997; Galer 1995) The pain may superficial or deep, intermittent or constant, and can be spontaneous or be triggered by various stimuli.
Conventional management often involves the combined use of a range of pharmacological (e.g. amitriptyline, gabapentin, opioids, NSAIDs, topical treatments such as capsaicin and lidocaine) and non-drug approaches, (e.g. transcutaneous electrical nerve stimulation, psychological treatments, and specialist procedures to stimulate, block or destroy discrete areas of the nervous system.(Sykes 1997)
Galer BS. Neuropathic pain of peripheral origin: advances in pharmacologic treatment. Neurology 1995; 45 (suppl 9):
International Association for the Study of Pain (2007). IASP Pain terminology [online]. Available: www.iasp-pain.org/AM/Template.cfm?Section=Home&Template=/CM/HTMLDisplay.cfm&ContentID=3058#Neuropathic
National Institute for Health and Clinical Excellence, 2010. CG96 Neuropathic pain - pharmacological management: full guideline [online]. Available: htt
Smith BH, Torrance N (2010) Neuropathic pain. In: Croft PR, editor. Chronic pain epidemiology: from aetiology to public health. Oxford: Oxford University Press, in press (ISBN 9780199235766)
Sykes J et al. Difficult pain problems. BMJ 1997; 315: 867-9.
This Factsheet focuses on the evidence for acupuncture in trigeminal neuralgia, chemical-induced neuropathy and neuropathy due to HIV infection. Diabetic neuropathy is discussed in the Type 2 diabetes mellitus Factsheet. There are also Factsheets on Sciatica and Cancer. Carpal tunnel syndrome and postherpetic neuralgia will be discussed in future Factsheets.
One systematic review of randomised controlled trials comparing acupuncture with carbamazepine for trigeminal neuralgia found acupuncture to be as effective as drug treatment, but to cause fewer unwanted effects.(Liu 2010) In single randomised controlled trials, electroacupuncture was found not to be effective for chronic painful neuropathy in general (Penza 2011); acupuncture was found to be more effective than cobamamide for peripheral neuropathy due to chemotherapy (Xu 2010); acupuncture plus acupoint injection was found to be more effective than carbamazepine for greater occipital neuralgia (Pan 2008); and neither acupuncture nor amitriptyline were found to be more effective than placebo for peripheral neuropathy due to HIV infection, but acupuncture was associated with reduced attrition and mortality rates(Shlay 1998; Shiflett 2011). Other non-randomised studies have found encouraging results with acupuncture for chemotherapy-induced neuropathy, HIV/AIDs-induced neuropathy, trigeminal neuralgia and peripheral neuropathy of undefined aetiology.(Donald 2011; Schrader 2007; Phillips 2004; Galantino 1999; Spacek 1998).
In summary, acupuncture seems to be at least as beneficial as the drugs it has been tested against, though in some circumstances neither may be very effective. As yet, there is insufficient research to indicate which patient groups it may be most helpful for. Acupuncture may offer additional benefits, from better sleep to reduced mortality, and probably has fewer side effects than pharmaceutical treatment.
In general, acupuncture is believed to stimulate the nervous system and cause the release of neurochemical messenger molecules. The resulting biochemical changes influence the body's homeostatic mechanisms, thus promoting physical and emotional well-being.
Research has shown that acupuncture treatment may specifically help to relieve neuropathic pain by:
· Reducing hypersensitivity induced by spinal nerve ligation, an effect dependent on
· Inhibiting paclitaxel-induced allodynia/hyperalgesia through spinal opioid receptors
· Influencing the neurotrophic factor signalling system, which is important in
· Acting on areas of the brain known to reduce sensitivity to pain and stress, as well
as promoting relaxation and deactivating the ‘analytical’ brain, which is responsible for anxiety and worry (Hui 2010; Hui 2009);
· Increasing the release of adenosine, which has antinociceptive properties
· Improving muscle stiffness and joint mobility by increasing local microcirculation
(Komori 2009), which aids dispersal of swelling;
· Reducing inflammation, by promoting release of vascular and immunomodulatory
With over 3000 members, the British Acupuncture Council (BAcC) is the UK’s largest professional body for traditional acupuncturists. Membership of the BAcC guarantees excellence in training, safe practice and professional conduct. To find a qualified traditional acupuncturist, contact the BAcC on 020 8735 0400 or visit
A systematic review that assessed the efficacy of acupuncture
treatment for trigeminal neuralgia. Twelve randomised controlled
Altern Ther Health Med 2010; 16: 30-5. studies involving a total of 920 people were included that
compared acupuncture with carbamazepine. Four trials reported
that acupuncture was superior to carbamazepine, and the
remaining eight studies showed no difference between the treatment and control groups. Adverse effects with acupuncture, which were reported in three studies, were mild. The reviewers concluded that the evidence suggests that acupuncture is of a similar efficacy to carbamazepine, but results in fewer adverse effects in treatment of trigeminal neuralgia.
Randomised controlled trials
A double-blind randomised placebo-controlled trial that
investigated the analgesic efficacy of electroacupuncture (EA) in
16 patients with chronic painful neuropathy. EA was compared to
doi: 10.1111/j.1526-4637.2011.01230.x. pseudo-EA (placebo). Only one patient per group (EA and
pseudo-EA) reported 50% of pain relief at the end of each treatment compared with pain intensity at baseline. Pain intensity did not differ between EA and pseudo-EA. The researchers concluded that their results do not support the use of EA in this population of painful neuropathy patients.
A randomised controlled trial that looked at effective treatments
for peripheral neuropathy induced by chemotherapeutic drugs. A
total of 64 patients with peripheral neuropathy induced by
paclitaxel or oxaliplatin were randomly allocated to acupuncture
or intramuscular injection of cobamamide. The neurotoxicity of
two groups was compared using a questionnaire before and after treatment. The total effective rate for sensory nerve
disorder in the acupuncture group was 66.7% compared to
40.0% in medication group (p< 0.05). The researchers concluded that acupuncture is more effective than cobamamide for treatment of peripheral neuropathy induced by chemotherapeutic drugs.
A randomised controlled study that assessed the therapeutic
effects of acupuncture plus acupoint-injection on greater occipital
neuralgia in 84 patients. Acupuncture plus acupoint-injection was
compared with oral carbamazepine. The total effective rate was 92.8% in the treatment group and 71.4% in the control group.
The difference in the total effective rate was significant (p<0.05) between the two groups. The researchers concluded that acupuncture plus acupoint-injection is effective for greater occipital neuralgia and better than the carbamazepine.
A randomised controlled trial that evaluated the efficacy of a
amitriptyline for pain due to HIV-related standardised acupuncture regimen (SAR) and amitriptyline peripheral neuropathy: a randomized
hydrochloride for the relief of pain due to HIV-related peripheral
neuropathy in 250 patients. All treatment groups showed a
reduction in mean pain scores at 6 and 14 weeks compared with
baseline values, but there was no significant difference between the placebo, acupuncture or amitriptyline groups. The
researchers concluded that neither acupuncture nor amitriptyline
was more effective than placebo in relieving pain caused by HIV-related peripheral neuropathy.
A reassessment of research assessing acupuncture versus
amitriptyline for peripheral neuropathy in 114 HIV-infected
patients study. The results were inconclusive for pain measures,
but acupuncture had a strong and positive effect on attrition and
mortality. Overall, acupuncture was associated with lower
attrition rate (27.6% vs. 44.6%, p=0.058), and a zero mortality
rate (0% vs. 12.5%, p=0.047) than amitriptyline. This protective effect of acupuncture was most pronounced among patients with
poorest physical functioning at the beginning of the study (0% vs. 23.8%, p=0.047). The researchers concluded that acupuncture was clearly effective in reducing attrition and mortality in men with HIV and peripheral neuropathy, but that results for pain relief were mixed.
Other clinical studies
An observation study that clinically evaluated the effectiveness
of acupuncture in the management of 18 patients with
chemotherapy-induced peripheral neuropathy (PN). In all, 82%
(n=14) of patients reported an improvement in symptoms
following their course of acupuncture; one patient with advanced disease died during the 6 weeks. Some patients derived
additional benefits from the treatment, including a reduction in
analgesic use and improved sleeping patterns. The researchers concluded that, although these results are encouraging, they are
A pilot study to evaluate the therapeutic effect of acupuncture on
treatment improves nerve conduction in peripheral neuropathy as measured by changes in nerve peripheral neuropathy. Eur J Neurol
conduction and assessment of subjective symptoms. Forty
seven patients with neuropathy of undefined aetiology were enrolled: 21 were treated with acupuncture therapy according to
classical Chinese Medicine, while26 received best medical care but no specific treatment for neuropathy. Sixteen patients (76%) in the acupuncture group improved symptomatically and objectively, while only four patients in the control group (15%) did so. Three patients in the acupuncture group (14%) showed no change and two patients an aggravation (10%), whereas in the control group seven showed no change (27%) and 15 an
aggravation (58%). The researchers concluded that their results suggest there is a positive effect of acupuncture on peripheral neuropathy of undefined aetiology as measured by objective parameters.
Phillips KD et al. Effect of acupuncture
A study that assessed acupuncture treatment for pain and
symptoms of peripheral neuropathy in 21 patients with HIV
and subjective peripheral neuropathy in infection. Comparison of the pretreatment and post-treatment persons with human immunodeficiency
Pain Rating Scale results indicated a significant reduction in
present pain (p=0.0002), least and most pain in the last 24 hours
(p<0.0001 and p=0.0004, respectively) and the total pain summary score (p<0.0001). Scores for pain/aching/burning, pins
and needles, and numbness in the hands and feet were reduced
(p=0.0065), as well as the total summary score (p=0.0001). The researchers concluded that subjective pain and symptoms of
peripheral neuropathy were reduced during the period of individual acupuncture therapy.
A prospective study that tested the hypothesis that low-voltage
non-invasive electroacupuncture will improve the condition of 11
patients with neuropathic HIV/AIDS. Complete data was
obtained from only 7 patients, and there was improvement in the
condition of all of them. They felt much better and reported feelings of increased physical strength and a significant overall
improvement in functional activities (p=0.02). The researchers concluded that their results support the hypothesis that low-voltage electroacupuncture will improve the condition of the neuropathic HIV/AIDS patient.
A retrospective analysis of data from 39 patients with trigeminal
neuralgia. In all, 17 patients had received carbamazepine and
trigeminal neuralgia. [Article in German] acupuncture therapy (group A), 11 had had carbamazepine and Wien Med Wochenschr 1998; 148: 447- GLOA + acupuncture (group B), and 11 had received 9.
carbamazepine and GLOA without acupuncture (group C). All subjects had taken carbamazepine for at least 4 weeks. Of the
groups who received acupuncture as an additive, 8 of the subjects in group A, and 5 of the subjects in group B were pain free, but only 2 of the subjects of group C (no acupuncture). The results for patients with marked pain reduction were similar. The researchers concluded that their results showed that the combined use of acupuncture and carbamazepine with or without GLOA achieves an additional therapeutic effect in the treatment of trigeminal neuralgia, and that the addition of acupuncture seems to have a superior effect to the addition of GLOA.
Possible mechanisms of acupuncture
A study in rats that found acupuncture stimulation was able to
reduce mechanical hypersensitivity with treatment beginning in
hypersensitivity induced by spinal nerve both acute and sub-chronic phases of SNL-induced neuropathy. ligation in rats. Neuroscience 2011; 193: The effect was blocked by naloxone, and was similar to the 370-6.
effect with gabapentin. The researchers concluded that their results demonstrated that manual acupuncture reduces
hypersensitivity induced by the spinal nerve ligation, and the
effect is dependent on the opioid system and comparable with the one obtained with gabapentin.
A study using rats that found electroacupuncture (EA) to
significantly inhibit paclitaxel-induced allodynia/hyperalgesia
through spinal opioid receptors. The researchers concluded that
EA may be a useful complementary treatment for neuropathic
neuropathy. Brain Res. 2011 Sep 26;1414:58-65.
A study showing that the neuromodulator adenosine, which has
receptors mediate local anti-nociceptive anti-nociceptive properties, was released during acupuncture in effects of acupuncture. Nat Neurosci
mice, and that its anti-nociceptive actions required adenosine A1
receptor expression. Direct injection of an adenosine A1 receptor agonist replicated the analgesic effect of acupuncture. Inhibition
of enzymes involved in adenosine degradation potentiated the
acupuncture-elicited increase in adenosine, as well as its anti-nociceptive effect. The researchers concluded that their observations indicate that adenosine mediates the effects of acupuncture and that interfering with adenosine metabolism may prolong the clinical benefit of acupuncture.
Studies have shown that acupuncture stimulation, when
system, and the anticorrelated networks associated with sensations comprising deqi, evokes deactivation of the brain. Auton Neurosci 2010; 157: of a limbic-paralimbic-neocortical network, as well as activation 81-90.
of somatosensory brain regions. These networks closely match the default mode network and the anti-correlated task-positive
network. The effect of acupuncture on the brain is integrated at multiple levels, down to the brainstem and cerebellum and appears to go beyond either simple placebo or somatosensory needling effects. Needling needs to be done carefully, as very strong or painful sensations can attenuate or even reverse the desired effects. Their results suggest that acupuncture mobilises the functionally anti-correlated networks of the brain to mediate its actions, and that the effect is dependent on the psychophysical response. They discuss potential clinical application to disease states including chronic pain, major depression, schizophrenia, autism, and Alzheimer's disease.
This study assessed the results of fMRI on 10 healthy adults
during manual acupuncture at 3 acupuncture points and a sham
point on the dorsum of the foot. Although certain differences
were seen between real and sham points, the hemodynamic and
psychophysical responses were generally similar for all 4 points. Acupuncture produced extensive deactivation of the limbic-
paralimbic-neocortical system. Clusters of deactivated regions
were seen in the medial prefrontal cortex, the temporal lobe and the posterior medial cortex. The sensorimotor cortices, thalamus and occasional paralimbic structures such as the insula and anterior middle cingulate cortex showed activation. The researchers concluded that their results provided additional evidence that acupuncture modulates the limbic-paralimbic-neocortical network. They hypothesised that acupuncture may mediate its analgesic, anti-anxiety, and other therapeutic effects
via this intrinsic neural circuit that plays a central role in the affective and cognitive dimensions of pain.
Experimental study on rabbits in which acupuncture stimulation
was directly observed to increase diameter and blood flow
velocity of peripheral arterioles, enhancing local microcirculation.
Review article that suggests the anti-inflammatory actions of
neuroimmune basis of anti-inflammatory traditional and electro-acupuncture are mediated by efferent acupuncture. Integr Cancer Ther 2007;
vagus nerve activation and inflammatory macrophage
An animal study that found the endogenous glial cell line-derived
neurotrophic factor signalling system (important in neuropathic
pain) is involved in the effects of electroacupuncture analgesia
hyperalgesia in a rat model of neuropathic pain. Brain Research Bulletin 2006; 69: 30-6.
Terms and conditions
The use of this fact sheet is for the use of British Acupuncture Council members and is subject to the strict
conditions imposed by the British Acupuncture Council details of which can be found in the members
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