Neuropathic pain

Neuropathic pain
SpecialtyNeurology, psychiatry
SymptomsBurning pain, tingling, numbness, pain with normally non-painful stimuli, increased sensivity to pain[1][2][3]
ComplicationsTiredness, anxiety, depression, decreased quality of life[2]
TypesPeripheral: Diabetic neuropathy, post herpetic neuralgia, HIV/AIDS, cancer pain[2]
Central: Multiple sclerosis, spinal cord injury, stroke[2]
CausesDamage to the nervous system involved with touch[1]
Diagnostic methodBased on description together with an underlying cause[1]
TreatmentDuloxetine, gabapentin, nortriptyline, lidocaine cream, TENS[4]
Prognosis~partial pain relief[5]
Frequency7-10% of people[4]

Neuropathic pain (NP) is an unpleasant sensation caused by damage or disease affecting the part of the nervous system involved with touch.[1][2] Symptoms may include abnormal sensations such as burning, tingling, numbness, pain with normally non-painful stimuli, or increased sensivity to pain.[1][2][3] Complications may include tiredness, anxiety, depression, or decreased quality of life.[2]

It is divided into peripheral and central neuropathic pain depending on the part of the nervous system involved.[1] Peripheral causes include diabetic neuropathy, post herpetic neuralgia, HIV/AIDS, cancer pain, and ongoing pain after surgery; while central causes include multiple sclerosis (MS), spinal cord injury, and following a stroke.[2] Diagnosis is based on the description of the pain together with evidence of an underlying cause.[1]

Initial treatment may include duloxetine, gabapentin, or nortriptyline.[4] Lidocaine or capsaicin cream or TENS may be used for a specific area of pain.[4][6] If these are not effective pregabalin, counseling, or tramadol may be tried.[4] Other options may include spinal cord stimulation.[4] In trigeminal neuralgia, carbamazepine is used.[6] Despite treatment only about half of people get partial relief from pain.[5]

Neuropathic pain affects about 7-10% of people.[4] It represents about 25% of chronic pain cases.[3] It occurs in about 20% of people with MS and up to half of people after spinal cord injury.[3] Early descriptions of the condition date from the 900s CE by the Persian physicians Abu Bakr al-Razi and Haly Abbas; with descriptions in Europe in the 1700s by John Fothergill.[7]

Signs and symptoms

Neuropathic pain has physiological effects on the brain which can manifest as psychological disorders. Rodent models where the social effects of chronic pain can be isolated from other factors suggest that induction of chronic pain can cause anxio-depressive symptoms and that particular circuits in the brain have a direct connection.[8][9] Depression and neuropathic pain may have a bidirectional relationship and relief of co-morbid depression may underlie some of the therapeutic efficacy of antidepressants in neuropathic pain. Neuropathic pain has important effects on social well-being that should not be ignored. People with neuropathic pain may have difficulty working exhibiting higher levels of presenteeism, absenteeism and unemployment,[10] exhibit higher levels of substance misuse (which may be related to attempted self-medication),[11][12] and present difficulties with social interactions.[13] Moreover, uncontrolled neuropathic pain is a significant risk factor for suicide.[14] Certain classes of neuropathic pain may cause serious adverse effects necessitating hospital admission, for instance trigeminal neuralgia can present as a severe crisis where the patient may have difficulty talking, eating and drinking.[15] As neuropathic pain may be comorbid with cancer, it can have important dose limiting effects on certain classes of chemotherapeutic.[16]

Cause

Peripheral

Peripheral neuropathies are commonly caused by diabetes, metabolic disorders, herpes zoster infection, HIV-related neuropathies, nutritional deficiencies, toxins, remote manifestations of cancer, immune mediated disorders and physical trauma to a nerve trunk.[17][18] Neuropathic pain is common in cancer as a direct result of cancer on peripheral nerves (e.g., compression by a tumor), or as a side effect of chemotherapy (chemotherapy-induced peripheral neuropathy),[19][20] radiation injury or surgery.[2]

Central

Central neuropathic pain is found in spinal cord injury[21] and multiple sclerosis.[22]

Mechanism

The underlying pathophysiology of neuropathic pain remains a contested topic. The etiology and mechanism of pain are related to the cause of the pain. Certain forms of neuropathic pain are associated with lesions to the central nervous system such as thalamic pain associated with certain lesions (for instance strokes) to the thalamus[23] whereas other forms of pain have a peripheral inciting injury such as traumatic neuropathies.[21] The inciting cause of neuropathy has important consequences for its mechanistic basis as different tissues and cells are involved. The mechanistic basis of neuropathic pain remains controversial as do the relative contributions of each pathway. Notably our understanding of these processes is largely driven by rodent models in part because studying these tissues in living adults is difficult.

Peripheral

With peripheral nervous system lesions, a number of processes may occur. Intact neurons may become unusually sensitive and develop spontaneous pathological activity and abnormal excitability.

During neuropathic pain, ectopic activity arises in the peripheral nociceptors and this appears to be due in part to changes in the ion channel expression at the level of the periphery. There may be an increase in the expression or activity of voltage gated sodium and calcium channels which will support action potential generation. There may also be a decrease in potassium channels which would normally oppose action potential generation. Each of these changes appears to support an increase in excitability, which may allow endogenous stimuli to cause spontaneous pain.[24]

Central

Central mechanisms of neuropathic pain involve a number of major pathways. Nociception is ordinarily transduced by a polysynaptic pathway through the spinal cord, and up the spinothalamic tract to the thalamus and then the cortex. Broadly speaking in neuropathic pain, neurons are hypersensitized, glia become activated and there is a loss of inhibitory tone.

Pain gates

Gate control theory of pain

A major hypothesis in the theory of pain perception is the gate control theory of pain, proposed by Wall and Melzack in 1965. The theory predicts that the activation of central pain inhibitory neurons by non-pain sensing neurons prevents the transmission of non-harmful stimuli to pain centers in the brain. A loss of inhibitory neurons, GAD65/67 expression (the enzymes that synthesise GABA; the predominant inhibitory transmitter in the adult brain), has been observed in some systems following peripheral neuropathy such as in rats, and mice.[25] However, these observations remain controversial with some investigators unable to detect a change. The loss of inhibitory inputs may allow fibers to transmit messages via the spinothalamic tract thus causing pain in normally painless stimuli. This loss of inhibition may not be limited to the spinal cord and a loss of GABA has also been observed in chronic pain patients in the thalamus.[26]

Glia

Microglia (identified by alpha-coronin1a), and neurons in culture. Microglia are proposed to release molecules that alter the excitability of neurons.

During neuropathic pain, glia become "activated" leading to the release of proteins that modulate neural activity. The activation of glia remains an area of intense interest for researchers. Microglia, the brain and spinal cord resident immune cells, respond to extrinsic cues. The source of these cues may include neurons secreting chemokines such as CCL21 and surface immobilized chemokines such as CX3CL1. Other glia such as astrocytes and oligodendrocytes may also release these extrinsic cues for microglia and microglia themselves may produce proteins that amplify the response.[27] The effect of microglia on neurons that leads to the neurons being sensitized is controversial. Brain derived neurotrophic factor, prostaglandins, TNF and IL-1β may be produced by microglia and cause changes in neurons that lead to hyperexcitability.[28][29]

Central sensitization

Central sensitization is a potential component of neuropathic pain. It refers to a change in synaptic plasticity, efficacy, and intrinsic disinhibition that leads to an uncoupling of noxious inputs. In the sensitized neuron, outputs are no longer coupled to the intensity or duration and many inputs may be combined.[30]

Circuit potentiation

During high frequency stimulation synapses conveying nociceptive information may become hyper efficient in a process that is similar although not identical to long-term potentiation.[31] Molecules such as substance P may be involved in potentiation via neurokinin receptors. NMDA activation also triggers a change in the post synapse, it activates receptor kinases that increase receptor trafficking and post-translationally modify receptors causing changes in their excitability.[30]

Cellular

The phenomena described above are dependent on changes at the cellular and molecular levels. Altered expression of ion channels, changes in neurotransmitters and their receptors, as well as altered gene expression in response to neural input, are at play.[32] Neuropathic pain is associated with changes in sodium and calcium channel subunit expression resulting in functional changes.  In chronic nerve injury, there is redistribution and alteration of subunit compositions of sodium and calcium channels resulting in spontaneous firing at ectopic sites along the sensory pathway.[18]

Diagnosis

Quantitative sensory testing may assist with diagnosis of specific deficits

Diagnosis of pain conditions relies on the character of the pain with a sharp stabbing character and the presence of particular features such as mechanical allodynia and cold allodynia. Neuropathic pain also tends to affect defined dermatomes and there may be limits to the area of pain. For neuropathic pain, clinicians look for an underlying lesion to the nervous system or an inciting cause consistent with the development of neuropathic pain. The obvious presence of an underlying feature or cause is not always detectable, and response to treatment may be used as a surrogate particularly in cases where diagnosis of the underlying lesion leaves the patient in pain for a prolonged period of time. MRI may be helpful in the identification of underlying lesions, reversible causes or serious underlying conditions such as primary presentation of a tumor or multiple sclerosis. Quantitative sensory testing (QST), a system of detailed analysis of the somatosensory system, is frequently used in research situations to identify neuropathic pain and a more detailed analysis of its components. It has been suggested by some authorities that QST may have a future role in the diagnosis of neuropathic pain and in particular the identification of neuropathic pain subtypes. Neuropathic pain can occur alone or in combination with other types of pain. The identification of neuropathic pain components is important as different classes of analgesic are required.[33]

The gold standard for diagnosing small fiber neuropathy as the etiology of neuropathic pain is skin biopsy. Sudomotor assessment, through electrochemical skin conductance, an accurate objective technique, could be considered as a good screening tool to limit skin biopsy in patients in whom it is not suitable.[34][35]

Treatments

Neuropathic pain can be difficult to treat with about half of people achieving partial relief.[5] First line treatments are certain antidepressants (tricyclic antidepressants and serotonin–norepinephrine reuptake inhibitors), and anticonvulsants (pregabalin and gabapentin).[36][37] Opioids may be useful but are not recommended as first line treatments.[37]

Anticonvulsants

Pregabalin and gabapentin may reduce pain associated with diabetic neuropathy.[38][36][39][40] The anticonvulsants carbamazepine and oxcarbazepine are especially effective in trigeminal neuralgia. Carbamazepine is a voltage-gated sodium channel inhibitor, and reduces neuronal excitability by preventing depolarisation.[41] Carbamazepine is most commonly prescribed to treat trigeminal neuralgia due to clinical experience and early clinical trials showing strong efficacy. Gabapentin may reduce symptoms associated with neuropathic pain or fibromyalgia in some people.[36] There is no predictor test to determine if it will be effective for a particular person. A short trial period of gabapentin therapy is recommended, to determine the effectiveness for that person. 62% of people taking gabapentin may have at least one adverse event, however the incidence of serious adverse events was found to be low.[36]

Meta analysis of randomized clinical trials suggests that Lamotrigine is not useful for the majority of patients although it may have use in treatment refractory cases.[42]

Antidepressants

Dual serotonin-norepinephrine reuptake inhibitors in particular duloxetine, as well as tricyclic antidepressants in particular amitriptyline, and nortriptyline are considered first-line medications for this condition.[37]

Opioids

Opioids, while commonly used, are not a recommended first or second line treatment.[43][4] In the short and long term they, including tramadol, are of unclear benefit.[44][45] Possibly 14% of people see improved pain; however, there are safety risks.[4]

It is unclear if fentanyl or hydromorphone gives pain relief to people with neuropathic pain.[46][47] The potential pain relief benefits of opioids must be weighed against their addiction potential and some authorities suggest that they should be reserved for cancer pain.[48] Some studies suggest that stopping long-term opioids may improve pain in non-cancer related chronic pain.[49][50]

Other

Non-pharmaceutical treatments such as exercise, physical therapy and psychotherapy may be useful adjuncts to treatment.[51]

Botulinum toxin type A

Local intradermal injection of botulinum neurotoxin type A may be helpful in chronic focal painful neuropathies. However, it causes muscle paralysis which may impact quality of life.[52]

Cannabinoids

Evidence for the use of cannabis based medicines is limited, low-moderate quality evidence suggests some benefits.[4] It's has to be weighed against the negative psychotomimetic effects that may impact quality of life.[53][54] Therefore, cannabis is not recommended as a mainstream treatment but may have a place for treatment refractory cases.

Nerve stimulation

Neuromodulation encompasses both implantable and non-implantable technologies (electrical and chemical) for treatment purposes.[55] High-frequency rTMS and spinal cord stimulation are third line treatments.[4]

Implanted devices are expensive and carry the risk of complications. Available studies have focused on conditions having a different prevalence than neuropathic pain patients in general. More research is needed to define the range of conditions that they might benefit.

The best long-term results with deep brain stimulation have been reported with targets in the periventricular/periaqueductal grey matter (79%), or the periventricular/periaqueductal grey matter plus thalamus and/or internal capsule (87%).[56] There is a significant complication rate, which increases over time.[57]

Stimulation of the primary motor cortex through electrodes placed within the skull but outside the thick meningeal membrane (dura) has been used to treat pain. The level of stimulation is below that for motor stimulation. As compared with spinal stimulation, which is associated with noticeable tingling (paresthesia) at treatment levels, the only palpable effect is pain relief.[58][59]

Spinal cord stimulators use electrodes placed adjacent to but outside the spinal cord. The overall complication rate is one-third, most commonly due to lead migration or breakage but advancements in the past decade have driven complication rates much lower. Lack of pain relief occasionally prompts device removal.[60]

NMDA antagonism

The N-methyl-D-aspartate (NMDA) receptor seems to play a major role in neuropathic pain and in the development of opioid tolerance. Dextromethorphan is an NMDA antagonist at high doses. NMDA antagonists such as ketamine and dextromethorphan may help neuropathic pain and reverse opioid tolerance.[61] Use is limited by a short half life (ketamine), weak activity (memantine) or unacceptable side effects (dextromethorpan).

Intrathecal medication

Intrathecal pumps deliver medication to the fluid filled (subarachnoid) space surrounding the spinal cord. Opioids alone or opioids with adjunctive medication (either a local anesthetic or clonidine). Rarely there are complications such as serious infection (meningitis), urinary retention, hormonal disturbance and intrathecal granuloma formation have been noted with intrathecal infusion, associated with the delivery method.

Ziconotide is a voltage-gated calcium channel blocker which may be used in severe cases of ongoing neuropathic pain[62] it is delivered intrathecally.

Topical agents

In some forms of neuropathy the topical application of local anesthetics such as lidocaine may provide relief. A transdermal patch containing lidocaine is available commercially in some countries.

Repeated topical applications of capsaicin are followed by a prolonged period of reduced skin sensibility referred to as desensitization, or nociceptor inactivation. Capsaicin causes reversible degeneration of epidermal nerve fibers.[63] Notably the capsaicin used for the relief of neuropathic pain is a substantially higher concentration than capsaicin creams available over the counter, there is no evidence that over the counter capsaicin cream can improve neuropathic pain[64] and topical capsaicin can itself induce pain.[63]

Alternative therapies

There is no good evidence that herbal products (nutmeg or St John's wort) are useful.[65]

A 2007 review of injected alpha lipoic acid (ALA) was found a reduction of symptoms of peripheral diabetic neuropathy.[66] While some studies on ALA by mouth had suggested a reduction in both the positive symptoms of diabetic neuropathy (dysesthesia including stabbing and burning pain) as well as neuropathic deficits (paresthesia),[67] the meta-analysis showed "more conflicting data whether it improves sensory symptoms or just neuropathic deficits alone".[66] There is some limited evidence that ALA is also helpful in some other non-diabetic neuropathies.[68]

Benfotiamine is a prodrug of vitamin B1 that has several trials showing benefit in neuropathy and various other diabetic comorbidities.[69]

History

The history of pain management can be traced back to ancient times. Galen suggested nerve tissue as the transferring route of pain to the brain through the invisible psychic pneuma.[70] The idea of origination of pain from the nerve itself, without any exciting pathology in other organs is presented by medieval medical scholars such as Rhazes, Haly Abbas and Avicenna. They named this type of pain specifically as "vaja al asab" [nerve originated pain], described its numbness, tingling and needling quality, discussed its etiology and the differentiating characteristics.[71]

The description of neuralgia was made by John Fothergill (1712-1780). In a medical article entitled "Clinical Lecture on Lead Neuropathy" published in 1924 the word "neuropathy" was used for the first time by Gordon.[72]

Research

The use of gene therapy is being studied as of 2022.[73] Nanotechnology-based drug delivery systems have been identified as promising.[74][75]

References

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