Peripheral neuropathy

Not to be confused with Nephropathy or Neuropathology.
Peripheral neuropathy
Micrograph showing a vasculitic peripheral neuropathy; plastic embedded; Toluidine blue stain
SpecialtyNeurology
SymptomsSensory: Numbness, neuropathic pain, poor balance[1]
Motor: Muscle weakness, twitching, muscle shinking[1]
Autonomic: Trouble with heat, excess sweating, trouble swallowing[1]
TypesPredominantly sensory, predominantly motor, sensory-motor, and autonomic neuropathy[1]
CausesDiabetic neuropathy, alcoholic neuropathy, Guillain-Barré syndrome, carpal tunnel syndrome, meralgia paresthetica, complex regional pain syndrome, injury, poor blood flow, autoimmune, kidney or liver problems, vitamin B12 deficiency, paraneoplastic syndromes, certain medications including chemotherapy, genetics, shingles, Lyme disease, HIV/AIDS, unclear[1][2]
Diagnostic methodBased on symptoms, examination, and blood tests[1]
TreatmentBased on underlying cause, nortriptyline, duloxetine, gabapentin[1]
Frequency1 to 7% of people[2]

Peripheral neuropathy, sometimes shortened to neuropathy, is damage to peripheral nerves, meaning nerves that connect the brain and spinal cord to the rest of the body.[1] Symptoms depend on the type of nerves involved.[1] This may include muscle weakness, twitching, or shinking; numbness, neuropathic pain, or poor balance; or trouble with heat, excess sweating, or trouble swallowing.[1] Onset may be over days to years.[1] It often starts with the lower legs and hands.[2]

Common types include diabetic neuropathy, alcoholic neuropathy, Guillain-Barré syndrome, carpal tunnel syndrome, meralgia paresthetica, and complex regional pain syndrome.[1][2] Other causes include injury, poor blood flow, autoimmune, kidney or liver problems, vitamin B12 deficiency, vitamin B6 deficiency, paraneoplastic syndromes, certain medications including chemotherapy, genetics, shingles, Lyme disease, and HIV/AIDS; though the cause may remain unclear.[1][2] Diagnosis is based on symptoms and examination.[1] Blood tests are generally done for diabetes, vitamins, liver, thyroid, and kidney function; while tests for abnormal proteins may also be done.[1][2] Other tests may include nerve conduction velocity, electromyography, or nerve biopsy.[1]

If the underlying cause can be address, recovery may occur over time.[1] Other measures that may help include stopping smoking, exercise, and blood sugar control.[1] Autoimmune cases may be improved with medications such as prednisone, cyclosporine, or azathioprine.[1] Plasmapheresis may also help in certain cases.[1] Medications to improve pain may include nortriptyline, duloxetine, or gabapentin.[1]

Peripheral neuropathy affects about 1 to 7% of people.[2] This includes up to half of people with diabetes.[2] It becomes more common over the age of 50.[2] Clear descriptions of the condition date from 1880 by Joseph Jules Dejerine.[3]

Classification

Peripheral neuropathy may be classified according to the number and distribution of nerves affected (mononeuropathy, mononeuritis multiplex, or polyneuropathy), the type of nerve fiber predominantly affected (motor, sensory, autonomic), or the process affecting the nerves; e.g., inflammation (neuritis), compression (compression neuropathy), chemotherapy (chemotherapy-induced peripheral neuropathy). The affected nerves are found in an EMG (electromyography) / NCS (nerve conduction study) test and the classification is applied upon completion of the exam.[4]

Neuropathy affecting just one nerve is called "mononeuropathy" and neuropathy involving nerves in roughly the same areas on both sides of the body is called "symmetrical polyneuropathy" or simply "polyneuropathy". When two or more (typically just a few, but sometimes many) separate nerves in disparate areas of the body are affected it is called "mononeuritis multiplex", "multifocal mononeuropathy", or "multiple mononeuropathy".[5][6][7]

Mononeuropathy

See also: Compression neuropathy and Ulnar neuropathy

Mononeuropathy is a type of neuropathy that only affects a single nerve.[8] Diagnostically, it is important to distinguish it from polyneuropathy because when a single nerve is affected, it is more likely to be due to localized trauma or infection.

The most common cause of mononeuropathy is physical compression of the nerve, known as compression neuropathy. Carpal tunnel syndrome and axillary nerve palsy are examples. Direct injury to a nerve, interruption of its blood supply resulting in (ischemia), or inflammation also may cause mononeuropathy.

Polyneuropathy

Main article: Polyneuropathy

Polyneuropathy is a pattern of nerve damage that is quite different from mononeuropathy, often more serious and affecting more areas of the body. The term "peripheral neuropathy" sometimes is used loosely to refer to polyneuropathy. In cases of polyneuropathy, many nerve cells in various parts of the body are affected, without regard to the nerve through which they pass; not all nerve cells are affected in any particular case. In distal axonopathy, one common pattern is that the cell bodies of neurons remain intact, but the axons are affected in proportion to their length; the longest axons are the most affected. Diabetic neuropathy is the most common cause of this pattern. In demyelinating polyneuropathies, the myelin sheath around axons is damaged, which affects the ability of the axons to conduct electrical impulses. The third and least common pattern affects the cell bodies of neurons directly. This usually picks out either the motor neurons (known as motor neuron disease) or the sensory neurons (known as sensory neuronopathy or dorsal root ganglionopathy).

The effect of this is to cause symptoms in more than one part of the body, often symmetrically on left and right sides. As for any neuropathy, the chief symptoms include motor symptoms such as weakness or clumsiness of movement; and sensory symptoms such as unusual or unpleasant sensations such as tingling or burning; reduced ability to feel sensations such as texture or temperature, and impaired balance when standing or walking. In many polyneuropathies, these symptoms occur first and most severely in the feet. Autonomic symptoms also may occur, such as dizziness on standing up, erectile dysfunction, and difficulty controlling urination.

Polyneuropathies usually are caused by processes that affect the body as a whole. Diabetes and impaired glucose tolerance are the most common causes. Hyperglycemia-induced formation of advanced glycation end products (AGEs) is related to diabetic neuropathy.[9] Other causes relate to the particular type of polyneuropathy, and there are many different causes of each type, including inflammatory diseases such as Lyme disease, vitamin deficiencies, blood disorders, and toxins (including alcohol and certain prescribed drugs).

Most types of polyneuropathy progress fairly slowly, over months or years, but rapidly progressive polyneuropathy also occurs. It is important to recognize that at one time it was thought that many of the cases of small fiber peripheral neuropathy with typical symptoms of tingling, pain, and loss of sensation in the feet and hands were due to glucose intolerance before a diagnosis of diabetes or pre-diabetes. However, in August 2015, the Mayo Clinic published a scientific study in the Journal of the Neurological Sciences showing "no significant increase in...symptoms...in the prediabetes group", and stated that "A search for alternate neuropathy causes is needed in patients with prediabetes."[10]

The treatment of polyneuropathies is aimed firstly at eliminating or controlling the cause, secondly at maintaining muscle strength and physical function, and thirdly at controlling symptoms such as neuropathic pain.

Mononeuritis multiplex

Echymotic/purpuric skin lesions in legs arrows (Neurological exam -sensory motor involvement left radial & ulnar, right common peroneal indicating a mononeuritis multiplex)

Mononeuritis multiplex, occasionally termed polyneuritis multiplex, is simultaneous or sequential involvement of individual noncontiguous nerve trunks,[11] either partially or completely, evolving over days to years and typically presenting with acute or subacute loss of sensory and motor function of individual nerves. The pattern of involvement is asymmetric, however, as the disease progresses, deficit(s) becomes more confluent and symmetrical, making it difficult to differentiate from polyneuropathy.[12] Therefore, attention to the pattern of early symptoms is important.

Mononeuritis multiplex also may cause pain, which is characterized as deep, aching pain that is worse at night and frequently in the lower back, hip, or leg. In people with diabetes mellitus, mononeuritis multiplex typically is encountered as acute, unilateral, and severe thigh pain followed by anterior muscle weakness and loss of knee reflex.

Electrodiagnostic medicine studies will show multifocal sensory motor axonal neuropathy.

It is caused by, or associated with, several medical conditions:

Autonomic neuropathy

Autonomic neuropathy is a form of polyneuropathy that affects the non-voluntary, non-sensory nervous system (i.e., the autonomic nervous system), affecting mostly the internal organs such as the bladder muscles, the cardiovascular system, the digestive tract, and the genital organs. These nerves are not under a person's conscious control and function automatically. Autonomic nerve fibers form large collections in the thorax, abdomen, and pelvis outside the spinal cord. They have connections with the spinal cord and ultimately the brain, however. Most commonly autonomic neuropathy is seen in persons with long-standing diabetes mellitus type 1 and 2. In most—but not all—cases, autonomic neuropathy occurs alongside other forms of neuropathy, such as sensory neuropathy.

Autonomic neuropathy is one cause of malfunction of the autonomic nervous system, but not the only one; some conditions affecting the brain or spinal cord also may cause autonomic dysfunction, such as multiple system atrophy, and therefore, may cause similar symptoms to autonomic neuropathy.

The signs and symptoms of autonomic neuropathy include the following:

Neuritis

Neuritis is a general term for inflammation of a nerve[21] or the general inflammation of the peripheral nervous system. Symptoms depend on the nerves involved, but may include pain, paresthesia (pins-and-needles), paresis (weakness), hypoesthesia (numbness), anesthesia, paralysis, wasting, and disappearance of the reflexes.

Causes of neuritis include:

Types of neuritis include:

Signs and symptoms

Those with diseases or dysfunctions of their nerves may present with problems in any of the normal nerve functions. Symptoms vary depending on the types of nerve fiber involved.[26] In terms of sensory function, symptoms commonly include loss of function ("negative") symptoms, including numbness, tremor, impairment of balance, and gait abnormality.[27] Gain of function (positive) symptoms include tingling, pain, itching, crawling, and pins-and-needles. Motor symptoms include loss of function ("negative") symptoms of weakness, tiredness, muscle atrophy, and gait abnormalities; and gain of function ("positive") symptoms of cramps, and muscle twitch (fasciculations).[28]

In the most common form, length-dependent peripheral neuropathy, pain and parasthesia appears symmetrically and generally at the terminals of the longest nerves, which are in the lower legs and feet. Sensory symptoms generally develop before motor symptoms such as weakness. Length-dependent peripheral neuropathy symptoms make a slow ascent of the lower limbs, while symptoms may never appear in the upper limbs; if they do, it will be around the time that leg symptoms reach the knee.[29] When the nerves of the autonomic nervous system are affected, symptoms may include constipation, dry mouth, difficulty urinating, and dizziness when standing.[28]

A user-friendly, disease-specific, quality-of-life scale can be used to monitor how someone is doing living with the burden of chronic, sensorimotor polyneuropathy. This scale, called the Chronic, Acquired Polyneuropathy - Patient-reported Index (CAP-PRI), contains only 15 items and is completed by the person affected by polyneuropathy. The total score and individual item scores can be followed over time, with item scoring used by the patient and care-provider to estimate clinical status of some of the more common life domains and symptoms impacted by polyneuropathy.

CAP-PRI (Patient instructions: For each item , choose “Not at all” (0 points), “A little bit” (1 point), or “A lot” (2 points). Consider the past week when answering. Complete scale periodically to follow clinical status, for example, a few weeks after starting a new medication or with some change in clinical status.)

1. I am frustrated by my neuropathy.

2. I am bothered by pain from neuropathy.

3. I am off balance when walking because of my neuropathy.

4. I have trouble getting dressed because of my neuropathy.

5. I have trouble sleeping because of my neuropathy.

6. I am bothered by limitations in performing my work (include work at home) because of my neuropathy.

7. I have trouble driving because of my neuropathy.

8. I am dependent on others because of my neuropathy.

9. I am depressed about my neuropathy.

10. I am falling because of my neuropathy.

11. I am preoccupied with my neuropathy.

12. I am unable to do all the leisure activities that I want to do because of my neuropathy.

13. I am worn out because of my neuropathy.

14. I have trouble eating because of my neuropathy.

15. I have trouble doing activities around the house.

Causes

The causes are grouped broadly as follows:

Diagnosis

Peripheral neuropathy may first be considered when an individual reports symptoms of numbness, tingling, and pain in feet. After ruling out a lesion in the central nervous system as a cause, diagnosis may be made on the basis of symptoms, laboratory and additional testing, clinical history, and a detailed examination.

During physical examination, specifically a neurological examination, those with generalized peripheral neuropathies most commonly have distal sensory or motor and sensory loss, although those with a pathology (problem) of the nerves may be perfectly normal; may show proximal weakness, as in some inflammatory neuropathies, such as Guillain–Barré syndrome; or may show focal sensory disturbance or weakness, such as in mononeuropathies. Classically, ankle jerk reflex is absent in peripheral neuropathy.

A physical examination will involve testing the deep ankle reflex as well as examining the feet for any ulceration. For large fiber neuropathy, an exam will usually show an abnormally decreased sensation to vibration, which is tested with a 128-Hz tuning fork, and decreased sensation of light touch when touched by a nylon monofilament.[29]

Diagnostic tests include electromyography (EMG) and nerve conduction studies (NCSs), which assess large myelinated nerve fibers.[29] Testing for small-fiber peripheral neuropathies often relates to the autonomic nervous system function of small thinly- and unmyelinated fibers. These tests include a sweat test and a tilt table test. Diagnosis of small fiber involvement in peripheral neuropathy may also involve a skin biopsy in which a 3 mm-thick section of skin is removed from the calf by a punch biopsy, and is used to measure the skin intraepidermal nerve fiber density (IENFD), the density of nerves in the outer layer of the skin.[27] Reduced density of the small nerves in the epidermis supports a diagnosis of small-fiber peripheral neuropathy.

Laboratory tests include blood tests for vitamin B-12 levels, a complete blood count, measurement of thyroid stimulating hormone levels, a comprehensive metabolic panel screening for diabetes and pre-diabetes, and a serum immunofixation test, which tests for antibodies in the blood.[28]

Treatment

The treatment of peripheral neuropathy varies based on the cause of the condition, and treating the underlying condition can aid in the management of neuropathy. When peripheral neuropathy results from diabetes mellitus or prediabetes, blood sugar management is key to treatment. In prediabetes in particular, strict blood sugar control can significantly alter the course of neuropathy.[27] In peripheral neuropathy that stems from immune-mediated diseases, the underlying condition is treated with intravenous immunoglobulin or steroids. When peripheral neuropathy results from vitamin deficiencies or other disorders, those are treated as well.[27]

A 2009 Cochrane review states that there is no evidence from randomised trials on any form of treatment for neuralgic amyotrophy[40]

Medications

A range of medications that act on the central nervous system have been used to symptomatically treat neuropathic pain. Commonly used medications include tricyclic antidepressants (such as nortriptyline,[41] amitriptyline.[42] imapramine,[43] and desipramine,[44]) serotonin-norepinephrine reuptake inhibitor (SNRI) medications (duloxetine,[45] venlafaxine,[46] and milnacipran[47]) and antiepileptic medications (gabapentin,[48] pregabalin,[49] oxcarbazepine[50] zonisamide[51] levetiracetam,[52] lamotrigine,[53] topiramate,[54] clonazepam,[55] phenytoin,[56] lacosamide,[57] sodium valproate[58] and carbamazepine[59]). Opioid and opiate medications (such as buprenorphine,[60] morphine,[61] methadone,[62] fentanyl,[63] hydromorphone,[64] tramadol[65] and oxycodone[66]) are also often used to treat neuropathic pain.

As is revealed in many of the Cochrane systematic reviews listed below, studies of these medications for the treatment of neuropathic pain are often methodologically flawed and the evidence is potentially subject to major bias. In general, the evidence does not support the usage of antiepileptic and antidepressant medications for the treatment of neuropathic pain. Better designed clinical trials and further review from non-biased third parties are necessary to gauge just how useful for patients these medications truly are. Reviews of these systematic reviews are also necessary to assess for their failings.

It is also often the case that the aforementioned medications are prescribed for neuropathic pain conditions for which they had not been explicitly tested on or for which controlled research is severely lacking; or even for which evidence suggests that these medications are not effective.[67][68][69] The NHS for example explicitly state that amitriptyline and gabapentin can be used for treating the pain of sciatica.[70] This is despite both the lack of high quality evidence that demonstrates efficacy of these medications for that symptom,[42][48] and also the prominence of generally moderate to high quality evidence that reveals that antiepileptics in specific, including gabapentin, demonstrate no efficacy in treating it.[71]

Antidepressants

In general, according to Cochrane's systematic reviews, antidepressants have shown to either be ineffective for the treatment of neuropathic pain or the evidence available is inconclusive.[41][44][72][73] Evidence also tends to be tainted by bias or issues with the methodology.[74][75]

Cochrane systematically reviewed the evidence for the antidepressants nortriptyline, desipramine, venlafaxine and milnacipran and in all these cases found scant evidence to support their use for the treatment of neuropathic pain. All reviews were done between 2014 and 2015.[41][44][72][73]

A 2015 Cochrane systematic review of amitriptyline found that there was no evidence supporting the use of amitriptyline that did not possess inherent bias. The authors believe amitriptyline may have an effect in some patients but that the effect is overestimated.[74] A 2014 Cochrane systematic review of imipramine notes that the evidence suggesting benefit were "methodologically flawed and potentially subject to major bias."[75]

A 2017 Cochrane systematic review assessed the benefit of antidepressant medications for several types of chronic non-cancer pains (including neuropathic pain) in children and adolescents and the authors found the evidence inconclusive.[76]

Antiepileptics

A 2017 Cochrane systematic review found that daily dosages between (1800 - 3600) mg of gabapentin could provide good pain relief for pain associated with diabetic neuropathy only. This relief occurred for roughly (30 - 40)% of treated patients, while placebo had a (10 - 20)% response. Three of the seven authors of the review had conflicts of interest declared.[48] In a 2019 Cochrane review of pregabalin the authors conclude that there is some evidence of efficacy in the treatment of pain deriving from post-herpetic neuralgia, diabetic neuropathy and post-traumatic neuropathic pain only. They also warned that many patients treated will have no benefit. Two of the five authors declared receiving payments from pharmaceutical companies.[49]

A 2017 Cochrane systematic review found that oxcarbazepine had little evidence to support its use for treating diabetic neuropathy, radicular pain and other neuropathies. The authors also call for better studies.[50] In a 2015 Cochrane systematic review the authors found a lack of evidence showing any effectiveness of zonisamide for the treatment of pain deriving from any peripheral neuropathy.[51] A 2014 Cochrane review found that studies of levetiracetam showed no indication for its effectiveness at treating pain from any neuropathy. The authors also found that the evidence was possibly biased and that some patients experienced adverse events.[77]

A 2013 Cochrane systematic review concluded that there was high quality evidence to suggest that lamotrigine is not effective for treating neuropathic pain, even at high dosages (200 - 400) mg.[78] A 2013 Cochrane systematic review of topimirate found that the included data had a strong likelihood of major bias; despite this, it found no effectiveness for the drug in treating the pain associated with diabetic neuropathy. It had not been tested for any other type of neuropathy.[54] Cochrane reviews from 2012 of clonazepam and phenytoin uncovered no evidence of sufficient quality to support their use in chronic neuropathic pain."[79][80]

A 2012 Cochrane systematic review of lacosamide found it very likely that the drug is ineffective for treating neuropathic pain. The authors caution against positive interpretations of the evidence.[81] For sodium valproate the authors of a 2011 Cochrane review found that "three studies no more than hint that sodium valproate may reduce pain in diabetic neuropathy". They discuss how there is a probable overestimate of effect due to the inherent problems with the data and conclude that the evidence does not support its usage.[82] In a 2014 systematic review of carbamazepine the authors believe the drug to be of benefit for some people. No trials were considered greater than level III evidence; none were longer than 4 weeks in length or were deemed as having good reporting quality.[83]

A 2017 Cochrane systematic review aiming to assess the benefit of antiepileptic medications for several types of chronic non-cancer pains (including neuropathic pain) in children and adolescents found the evidence inconclusive. Two of the ten authors of this study declared receiving payments from pharmaceutical companies.[84]

Opioids

A Cochrane review of buprenorphine, fentanyl, hydromorphone and morphine, all dated between 2015 and 2017, and all for the treatment of neuropathic pain, found that there was insufficient evidence to comment on their efficacy. Conflicts of interest were declared by the authors in this review.[60][61][63][64] A 2017 Cochrane review of methadone found very low quality evidence, three studies of limited quality, of its efficacy and safety. They could not formulate any conclusions about its relative efficacy and safety compared to a placebo.[62]

For tramadol, Cochrane found that there was only modest information about the benefits of its usage for neuropathic pain. Studies were small, had potential risks of bias and apparent benefits increased with risk of bias. Overall the evidence was of low or very low quality and the authors state that it "does not provide a reliable indication of the likely effect".[65] For oxycodone the authors found very low quality evidence showing its usefulness in treating diabetic neuropathy and postherpetic neuralgia only. One of the four authors declared receiving payments from pharmaceutical companies.[66]

More generally, a 2013 review examining the overall efficacy of opioid therapy for the treatment of neuropathic pain found studies were often subject to bias and that their efficacy and safety was not deducible with the evidence available.[85] A 2017 Cochrane review examining opioid therapy as a treatment for many non-cancer pain syndromes (including neuropathic pain) concluded, "There was no evidence from randomised controlled trials to support or refute the use of opioids to treat chronic non-cancer pain in children and adolescents."[86]

Others

A 2016 Cochrane review of paracetamol for the treatment of neuropathic pain concluded that its benefit alone or in combination with codeine or dihydrocodeine is unknown.[87]

Few studies have examined whether nonsteroidal anti-inflammatory drugs are effective in treating peripheral neuropathy.[88]

There is some evidence that symptomatic relief from the pain of peripheral neuropathy may be obtained by application of topical capsaicin. Capsaicin is the factor that causes heat in chili peppers. However, the evidence suggesting that capsaicin applied to the skin reduces pain for peripheral neuropathy is of moderate to low quality and should be interpreted carefully before using this treatment option.[89]

Evidence supports the use of cannabinoids for some forms of neuropathic pain.[90] A 2018 Cochrane review of cannabis-based medicines for the treatment of chronic neuropathic pain included 16 studies. All of these studies included THC as a pharmacological component of the test group. The authors rated the quality of evidence as very low to moderate. The primary outcome was quoted as, "Cannabis-based medicines may increase the number of people achieving 50% or greater pain relief compared with placebo" but "the evidence for improvement in Patient Global Impression of Change (PGIC) with cannabis to be of very low quality". The authors also conclude, "The potential benefits of cannabis-based medicine... might be outweighed by their potential harms."[91]

A 2014 Cochrane review of topical lidocaine for the treatment of various peripheral neuropathies found its usage supported by a few low quality studies. The authors state that there are no high quality randomised control trials demonstrating its efficacy or safety profile.[92]

A 2015 Cochrane review of topical clonidine for the treatment of diabetic neuropathy included two studies of 8 and 12 weeks in length; both of which compared topical clonidine to placebo and both of which were funded by the same drug manufacturer. The review found that topical clonidine may provide some benefit versus placebo. However, the authors state that the included trials are potentially subject to significant bias and that the evidence is of low to moderate quality.[93]

A 2007 Cochrane review of aldose reductase inhibitors for the treatment of the pain deriving from diabetic polyneuropathy found it no better than placebo.[94]

Medical devices

Transcutaneous electrical nerve stimulation (TENS) therapy is often used to treat various types of neuropathy. A 2010 review of three trials, for the treatment of diabetic neuropathy explicitly, involving a total of 78 patients found some improvement in pain scores after 4 and 6, but not 12 weeks of treatment and an overall improvement in neuropathic symptoms at 12 weeks.[95] Another 2010 review of four trials, for the treatment of diabetic neuropathy, found significant improvement in pain and overall symptoms, with 38% of patients in one trial becoming asymptomatic. The treatment remains effective even after prolonged use, but symptoms return to baseline within a month of cessation of treatment.[96]

These older reviews can be balanced with a more recent 2017 review of TENS for neuropathic pain by Cochrane which concluded that, "This review is unable to state the effect of TENS versus sham TENS for pain relief due to the very low quality of the included evidence... The very low quality of evidence means we have very limited confidence in the effect estimate reported." A very low quality of evidence means, 'multiple sources of potential bias' with a 'small number and size of studies'.[97]

Diet

A strict gluten-free diet is an effective treatment when neuropathy is caused by gluten sensitivity, with or without the presence of digestive symptoms or intestinal injury.[23]

Counselling

A 2015 review on the treatment of neuropathic pain with psychological therapy concluded that, "There is insufficient evidence of the efficacy and safety of psychological interventions for chronic neuropathic pain. The two available studies show no benefit of treatment over either waiting list or placebo control groups."[98]

Alternative medicine

A 2019 Cochrane review of the treatment of herbal medicinal products for people suffering neuropathic pain for at least three months concluded that, "There was insufficient evidence to determine whether nutmeg or St John's wort has any meaningful efficacy in neuropathic pain conditions.The quality of the current evidence raises serious uncertainties about the estimates of effect observed, therefore, we have very little confidence in the effect estimate; the true effect is likely to be substantially different from the estimate of effect."[99]

A 2017 Cochrane review on the usage of acupuncture as a treatment for neuropathic pain concludes, "Due to the limited data available, there is insufficient evidence to support or refute the use of acupuncture for neuropathic pain in general, or for any specific neuropathic pain condition when compared with sham acupuncture or other active therapies." Also, "Most studies included a small sample size (fewer than 50 participants per treatment arm) and all studies were at high risk of bias for blinding of participants and personnel." Also, the authors state, "we did not identify any study comparing acupuncture with treatment as usual."[100]

A 2018 Cochrane review on acupuncture and related interventions for the treatment of carpal tunnel syndrome concluded that, "Acupuncture and laser acupuncture may have little or no effect in the short term on symptoms of carpal tunnel syndrome (CTS) in comparison with placebo or sham acupuncture." It was also noted that all studies had an unclear or high overall risk of bias and that all evidence was of low or very low quality.[101]

Alpha lipioc acid (ALA) with benfothiamine is a proposed pathogenic treatment for painful diabetic neuropathy only.[102] The results of two systematic reviews state that oral ALA produced no clinically significant benefit, intravenous ALA administered over the course of three weeks may improve symptoms and that long term treatment has not been investigated.[103]

Terminology

In conventional medical usage, the word neuropathy (neuro-, "nervous system" and -pathy, "disease of")[104] without modifier usually means peripheral neuropathy.

Research

A 2008 literature review concluded that, "based on principles of evidence-based medicine and evaluations of methodology, there is only a 'possible' association [of celiac disease and peripheral neuropathy], due to lower levels of evidence and conflicting evidence. There is not yet convincing evidence of causality."[105]

A 2019 review concluded that "gluten neuropathy is a slowly progressive condition. About 25% of the patients will have evidence of enteropathy on biopsy (CD [celiac disease]) but the presence or absence of an enteropathy does not influence the positive effect of a strict gluten-free diet."[23]

Stem-cell therapy is also being looked at as a possible means to repair peripheral nerve damage, however efficacy has not yet been demonstrated.[106][107][108]

See also

References

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  62. 1 2 McNicol ED, Ferguson MC, Schumann R (May 2017). Cochrane Pain, Palliative and Supportive Care Group (ed.). "Methadone for neuropathic pain in adults". The Cochrane Database of Systematic Reviews. 5: CD012499. doi:10.1002/14651858.CD012499.pub2. PMC 6353163. PMID 28514508.
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  75. 1 2 Hearn L, Derry S, Phillips T, Moore RA, Wiffen PJ (May 2014). "Imipramine for neuropathic pain in adults". The Cochrane Database of Systematic Reviews (5): CD010769. doi:10.1002/14651858.CD010769.pub2. PMC 6485593. PMID 24838845.
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Further reading

  • Latov N (2007). Peripheral Neuropathy: When the Numbness, Weakness, and Pain Won't Stop. New York: American Academy of Neurology Press Demos Medical. ISBN 978-1-932603-59-0.
  • "Practice advisory for the prevention of perioperative peripheral neuropathies: a report by the American Society of Anesthesiologists Task Force on Prevention of Perioperative Peripheral Neuropathies". Anesthesiology. 92 (4): 1168–82. April 2000. doi:10.1097/00000542-200004000-00036. PMID 10754638.
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