Diabetic neuropathy

Diabetic neuropathy
Areas affected by diabetic neuropathy
SpecialtyNeurology
SymptomsPeripheral: Numbness, tingling, or weakness of the limbs[1]
Autonomic: Urinary incontinence, gastroparesis, sexual dysfunction[2]
Focal: Carpel tunnel, cranial neuropathy[3]
ComplicationsDiabetic foot[4]
TypesPeripheral, autonomic, focal, poximal[5]
CausesDiabetes[5]
Risk factorsPoorly controlled diabetes, being overweight, high blood pressure, high cholesterol, kidney disease, alcohol, smoking[4]
Diagnostic methodExamination, electrophysiology testing[6]
TreatmentDiabetes and blood pressure control[4]
MedicationGabapentin, pregabalin, duloxetine, venlafaxine, topical salicylates[7]
FrequencyCommon[4][6]

Diabetic neuropathy is nerve damage due to diabetes.[5] Symptoms depend on the location of damage: with peripheral neuropathy resulting in numbness, tingling, or weakness of the limbs;[1] autonomic neuropathy resulting in urinary incontinence, gastroparesis, or sexual dysfunction;[2] focal neuropathy such as carpel tunnel or cranial neuropathy;[3] or poximal neuropathy with hip or thigh pain.[8] Complications can include a diabetic foot and neuropathic arthropathy.[4][6]

It can occur as a result of any type of diabetes.[6] Risk factors include poorly controlled diabetes, being overweight, high blood pressure, high cholesterol, kidney disease, alcohol, and smoking.[4] The underlying mechanism involves direct damage to nerves and the small blood vessels that supply them from high blood sugar.[4][6] Diagnosis may be by examination or electrophysiology testing.[6]

Treatment may include gabapentin, pregabalin, duloxetine, venlafaxine, or topical salicylates.[7] Opioids and tricyclic antidepressants are generally not recommended.[7] Other measures include properly managing diabetes, blood pressure, and cholesterol.[4]

Up to half of people with diabetes have peripheral neuropathy, more than 30% have autonomic neuropathy, and less than 10% have carpal tunnel.[4] The peripheral form of the disease was first clearly described in 1864 by Marchall de Calvi while the autonomic form was first described in the 1900s.[6]

Signs and symptoms

Diabetic neuropathy can affect any peripheral nerves including sensory neurons, motor neurons, and the autonomic nervous system. Therefore, diabetic neuropathy has the potential to affect essentially any organ system and can cause a range of symptoms. There are several distinct syndromes based on the organ systems affected.

Sensorimotor polyneuropathy

Longer nerve fibers are affected to a greater degree than shorter ones because nerve conduction velocity is slowed in proportion to a nerve's length. In this syndrome, decreased sensation and loss of reflexes occurs first in the toes on each foot, then extends upward. It is usually described as a glove-stocking distribution of numbness, sensory loss, dysesthesia and night time pain. The pain can feel like burning, pricking sensation, achy or dull. A pins and needles sensation is common. Loss of proprioception, the sense of where a limb is in space, is affected early. These patients cannot feel when they are stepping on a foreign body, like a splinter, or when they are developing a callus from an ill-fitting shoe. Consequently, they are at risk of developing ulcers and infections on the feet and legs, which can lead to amputation. Similarly, these patients can get multiple fractures of the knee, ankle or foot, and develop a Charcot joint. Loss of motor function results in dorsiflexion, contractures of the toes, loss of the interosseous muscle function that leads to contraction of the digits, so-called hammer toes. These contractures occur not only in the foot but also in the hand where the loss of the musculature makes the hand appear gaunt and skeletal. The loss of muscular function is progressive.

Autonomic neuropathy

The autonomic nervous system is composed of nerves serving the heart, lungs, blood vessels, bone, adipose tissue, sweat glands, gastrointestinal system and genitourinary system. Autonomic neuropathy can affect any of these organ systems. One commonly recognized autonomic dysfunction in diabetics is orthostatic hypotension, or becoming dizzy and possibly fainting when standing up due to a sudden drop in blood pressure. In the case of diabetic autonomic neuropathy, it is due to the failure of the heart and arteries to appropriately adjust heart rate and vascular tone to keep blood continually and fully flowing to the brain. This symptom is usually accompanied by a loss of respiratory sinus arrhythmia – the usual change in heart rate seen with normal breathing. These two findings suggest autonomic neuropathy.

Gastrointestinal manifestations include gastroparesis, nausea, bloating, and diarrhea. Because many diabetics take oral medication for their diabetes, absorption of these medicines is greatly affected by the delayed gastric emptying. This can lead to hypoglycemia when an oral diabetic agent is taken before a meal and does not get absorbed until hours, or sometimes days later when there is normal or low blood sugar already. Sluggish movement of the small intestine can cause bacterial overgrowth, made worse by the presence of hyperglycemia. This leads to bloating, gas and diarrhea.

Urinary symptoms include urinary frequency, urgency, incontinence and retention. Again, because of the retention of urine, urinary tract infections are frequent. Urinary retention can lead to bladder diverticula, kidney stones, and reflux nephropathy.

Cranial neuropathy

When cranial nerves are affected, neuropathies of the oculomotor nerve (cranial nerve #3 or CNIII) are most common. The oculomotor nerve controls all the muscles that move the eye except for the lateral rectus and superior oblique muscles. It also serves to constrict the pupil and open the eyelid. The onset of a diabetic third nerve palsy is usually abrupt, beginning with frontal or pain around the eye and then double vision. All the oculomotor muscles innervated by the third nerve may be affected, but those that control pupil size are usually well-preserved early on. This is because the parasympathetic nerve fibers within CNIII that influence pupillary size are found on the periphery of the nerve (in terms of a cross-sectional view), which makes them less susceptible to ischemic damage (as they are closer to the vascular supply). The sixth nerve, the abducens nerve, which innervates the lateral rectus muscle of the eye (moves the eye laterally), is also commonly affected but fourth nerve, the trochlear nerve, (innervates the superior oblique muscle, which moves the eye downward) involvement is unusual. Damage to a specific nerve of the thoracic or lumbar spinal nerves can occur and may lead to painful syndromes that mimic a heart attack, gallbladder inflammation, or appendicitis. Diabetics have a higher incidence of entrapment neuropathies, such as carpal tunnel syndrome.

Pathogenesis

Role of NF-κB and Nrf2 in diabetic neuropathy. Hyperglycaemia induced imbalance in Nrf2–NF-κB regulation can contribute to the pathogenesis of diabetic neuropathy[9]

The following processes are thought to be involved in the development of diabetic neuropathy:

Microvascular disease

Main article: Microangiopathy

Vascular and neural diseases are closely related. Blood vessels depend on normal nerve function, and nerves depend on adequate blood flow. The first pathological change in the small blood vessels is narrowing of the blood vessels. As the disease progresses, neuronal dysfunction correlates closely with the development of blood vessel abnormalities, such as capillary basement membrane thickening and endothelial hyperplasia, which contribute to diminished oxygen tension and hypoxia. Neuronal ischemia is a well-established characteristic of diabetic neuropathy. Blood vessel opening agents (e.g., ACE inhibitors, α1-antagonists) can lead to substantial improvements in neuronal blood flow, with corresponding improvements in nerve conduction velocities. Thus, small blood vessel dysfunction occurs early in diabetes, parallels the progression of neural dysfunction, and may be sufficient to support the severity of structural, functional, and clinical changes observed in diabetic neuropathy.

Glycated end products

Elevated levels of glucose within cells cause a non-enzymatic covalent bonding with proteins, which alters their structure and inhibits their function. Some of these glycated proteins have been implicated in the pathology of diabetic neuropathy and other long-term complications of diabetes.

Polyol pathway

Main article: Polyol pathway

Also called the sorbitol/aldose reductase pathway, the polyol pathway appears to be implicated in diabetic complications, especially in microvascular damage to the retina,[10] kidney,[11] and nerves.[12]

Diagnosis

Diabetic peripheral neuropathy can be diagnosed with a history and physical examination. The diagnosis is considered in people who develop pain or numbness in a leg or foot with a history of diabetes. Muscle weakness, pain, balance loss, and lower limb dysfunction are the most common clinical manifestations.[13] Physical exam findings may include changes in appearance of the feet, presence of ulceration, and diminished ankle reflexes, the most useful physical examination findings for large fiber neuropathy are an abnormally decreased vibration perception to a 128-Hz tuning fork (likelihood ratio (LR) range, 16–35) or pressure sensation with a 5.07 Semmes-Weinstein monofilament (LR range, 11–16). Normal results on vibration testing (LR range, 0.33–0.51) or monofilament (LR range, 0.09–0.54) make large fiber peripheral neuropathy from diabetes less likely.[14] Nerve conduction tests may show reduced functioning of the peripheral nerves, but seldom correlate with the severity of diabetic peripheral neuropathy and are not appropriate as routine tests for the condition.[15]

Classification

Diabetic neuropathy encompasses a series of different neuropathic syndromes which can be categorized as follows:[16]

  • Focal and multifocal neuropathies:
    • Mononeuropathy which affects one nerve
    • Amyotrophy or radiculopathy such as proximal diabetic neuropathy, affecting a specific pattern of nerves
    • Multiple lesions, affecting nerves that don't follow a specific pattern, also called "mononeuritis multiplex"
    • Nerve damage from entrapment (e.g. median, ulnar, peroneal)
  • Symmetrical neuropathies:
    • Sensory
    • Autonomic
    • Distal symmetrical polyneuropathy (DSPN), the diabetic type of which is also known as diabetic peripheral neuropathy (DPN) (most common presentation)

Prevention

Diabetic neuropathy can be largely prevented by maintaining blood glucose levels and lifestyle modifications.[17][18] Enhanced glucose control methods include more frequent subcutaneous insulin administration, continuous insulin infusion, oral antidiabetic agents, while lifestyle modifications may include exercise alone, or in combination with dietary modifications. Enhanced glucose control prevents the development of clinical neuropathy and reduces nerve abnormalities in type 1 diabetes, and delays the onset of neuropathy in both types of diabetes. However, such methods may increase the likelihood of experiencing a hypoglycemic event, and many of these more aggressive methods require more frequent insulin use which has been associated with excessive risk of falls.[19]

Treatment

Blood sugar

Treatment of early manifestations of sensorimotor polyneuropathy involves improving glycemic control.[20] Tight control of blood glucose can reverse the changes of diabetic neuropathy if the neuropathy and diabetes are recent in onset. This is the primary treatment of diabetic neuropathy that may change the course of the condition as the other treatments focus on reducing pain and other symptoms.

Medications

Medication options for pain control include antiepileptic drugs (AEDs), serotonin-norepinephrine reuptake inhibitors (SNRIs), and tricyclic antidepressants (TCAs).[21]

A systematic review concluded that "tricyclic antidepressants and traditional anticonvulsants are better for short term pain relief than newer generation anticonvulsants."[22] A further analysis of previous studies showed that the agents carbamazepine, venlafaxine, duloxetine, and amitriptyline were more effective than placebo, but that comparative effectiveness between each agent is unclear.[23]

The three medications approved in the United States for diabetic peripheral neuropathy (DPN) are the antidepressant duloxetine, the anticonvulsant pregabalin, and the long-acting opioid tapentadol ER (extended release).[24][25] Before trying a systemic medication, some doctors recommend treating localized diabetic peripheral neuropathy with lidocaine patches.[15]

Topical agents

Capsaicin applied to the skin in a 0.075% concentration has not been found to be more effective than placebo for treating pain associated with diabetic neuropathy. There is insufficient evidence to draw conclusions for more concentrated forms of capsaicin, clonidine, or lidocaine applied to the skin.[26] About 10% of people who use capsaicin cream have a large benefit.[27]

Antiepileptics

Multiple guidelines recommend antiepileptics, such as pregabalin, as first-line treatment for painful diabetic neuropathy.[28] Pregabalin is supported by low-quality evidence as more effective than placebo for reducing diabetic neuropathic pain but its effect is small.[26] Studies have reached differing conclusions about whether gabapentin relieves pain more effectively than placebo.[26][29] Available evidence is insufficient to determine if zonisamide or carbamazepine are effective for diabetic neuropathy.[26] The first metabolite of carbamazepine, known as oxcarbazepine, appears to have a small beneficial effect on pain. A 2014 systematic review and network meta-analysis concluded topiramate, valproic acid, lacosamide, and lamotrigine are ineffective for pain from diabetic peripheral neuropathy.[21][26] The most common side effects associated with AED use include sleepiness, dizziness, and nausea.[26]

Serotonin-norepinephrine reuptake inhibitors

As above, the serotonin-norepinephrine reuptake inhibitors (SNRIs) duloxetine and venlafaxine are recommended in multiple medical guidelines as first or second-line therapy for DPN.[28] A 2017 systematic review and meta-analysis of randomized controlled trials concluded there is moderate quality evidence that duloxetine and venlafaxine each provide a large benefit in reducing diabetic neuropathic pain.[26] Common side effects include dizziness, nausea, and sleepiness.[26]

Tricyclic antidepressants

TCAs include imipramine, amitriptyline, desipramine, and nortriptyline. They are generally regarded as first or second-line treatment for DPN.[28] Of the TCAs, imipramine has been the best studied.[26] These medications are effective at decreasing painful symptoms but suffer from multiple side effects that are dose-dependent.[26] One notable side effect is cardiac toxicity, which can lead to fatal abnormal heart rhythms. Additional common side effects include dry mouth, difficulty sleeping, and sedation.[26] At low dosages used for neuropathy, toxicity is rare, but if symptoms warrant higher doses, complications are more common. Among the TCAs, amitriptyline is most widely used for this condition, but desipramine and nortriptyline have fewer side effects.

Opioids

Typical opioid medications, such as oxycodone, appear to be no more effective than placebo. In contrast, low-quality evidence supports a moderate benefit from the use of atypical opioids (e.g., tramadol and tapentadol), which also have SNRI properties.[26] Opioid medications are recommended as second or third-line treatment for DPN.[28]

Medical devices

Monochromatic infrared photo energy treatment (MIRE) has been shown to be an effective therapy in reducing and often eliminating pain associated with diabetic neuropathy. The studied wavelength of 890 nm is able to penetrate into the subcutaneous tissue where it acts upon a specialized part of the cell called the cytochrome C. The infrared light energy prompts the cytochrome C to release nitric oxide into the cells. The nitric oxide in turn promotes vasodilation which results in increased blood flow that helps nourish damaged nerve cells. Once the nutrient rich blood is able to reach the affected areas (typically the feet, lower legs and hands) it promotes the regeneration of nerve tissues and helps reduce inflammation thereby reducing and/or eliminating pain in the area.

Transcutaneous electrical nerve stimulation (TENS) and interferential current (IFC) use a painless electric current and the physiological effects from low frequency electrical stimulation to relieve stiffness, improve mobility, relieve neuropathic pain, reduce oedema, and heal resistant foot ulcers.[30]

Physical therapy

Physical therapy may help reduce dependency on pain relieving drug therapies. Certain physiotherapy techniques can help alleviate symptoms brought on from diabetic neuropathy such as deep pain in the feet and legs, tingling or burning sensation in extremities, muscle cramps, muscle weakness, sexual dysfunction, and diabetic foot.[31]

Gait training, posture training, and teaching these patients the basic principles of off-loading can help prevent and/or stabilize foot complications such as foot ulcers.[30] Off-loading techniques can include the use of mobility aids (e.g. crutches) or foot splints.[30] Gait re-training would also be beneficial for individuals who have lost limbs, due to diabetic neuropathy, and now wear a prosthesis.[30]

Exercise programs, along with manual therapy, will help to prevent muscle contractures, spasms and atrophy. These programs may include general muscle stretching to maintain muscle length and a person's range of motion.[32] General muscle strengthening exercises will help to maintain muscle strength and reduce muscle wasting.[33] Aerobic exercise such as swimming and using a stationary bicycle can help peripheral neuropathy, but activities that place excessive pressure on the feet (e.g. walking long distances, running) may be contraindicated.[34] Exercise therapy has been shown to increase the blood flow to the peripheral nerves, can improve gait function.[35]

Heat, therapeutic ultrasound,[30] hot wax[30] are also useful for treating diabetic neuropathy.[30] Pelvic floor muscle exercises can improve sexual dysfunction caused by neuropathy. Electric stimulation of the plantar aspect of the foot showed improved balance and sensation when performed daily. [36]

Other

Low-quality evidence supports a moderate-large beneficial effect of botulinum toxin injections.[26] There is insufficient evidence to draw firm conclusions for the utility of the cannabinoids nabilone and nabiximols.[26]

Prognosis

The mechanisms of diabetic neuropathy are poorly understood. At present, treatment alleviates pain and can control some associated symptoms, but the process is generally progressive.

As a complication, there is an increased risk of injury to the feet because of loss of sensation (see diabetic foot). Small infections can progress to ulceration and this may require amputation.[37]

Epidemiology

Globally diabetic neuropathy affects approximately 132 million people as of 2010 (1.9% of the population).[38]

Diabetes is the leading known cause of neuropathy in developed countries, and neuropathy is the most common complication and greatest source of morbidity and mortality in diabetes. It is estimated that neuropathy affects 25% of people with diabetes.[39] Diabetic neuropathy is implicated in 50–75% of nontraumatic amputations.

The main risk factor for diabetic neuropathy is hyperglycemia. In the DCCT (Diabetes Control and Complications Trial, 1995) study, the annual incidence of neuropathy was 2% per year but dropped to 0.56% with intensive treatment of Type 1 diabetics. The progression of neuropathy is dependent on the degree of glycemic control in both Type 1 and Type 2 diabetes. Duration of diabetes, age, cigarette smoking, hypertension, height, and hyperlipidemia are also risk factors for diabetic neuropathy.

References

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  2. 1 2 "Autonomic Neuropathy | NIDDK". National Institute of Diabetes and Digestive and Kidney Diseases. Archived from the original on 17 April 2021. Retrieved 3 August 2021.
  3. 1 2 "Focal Neuropathies | NIDDK". National Institute of Diabetes and Digestive and Kidney Diseases. Archived from the original on 28 May 2021. Retrieved 3 August 2021.
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  20. ↑ "The effect of intensive diabetes therapy on the development and progression of neuropathy. The Diabetes Control and Complications Trial Research Group". Annals of Internal Medicine. 122 (8): 561–8. April 1995. doi:10.7326/0003-4819-122-8-199504150-00001. PMID 7887548. S2CID 24754081.
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  36. ↑ Jahantigh Akbari N, Hosseinifar M, Naimi SS, Mikaili S, Rahbar S (December 2020). "The efficacy of physiotherapy interventions in mitigating the symptoms and complications of diabetic peripheral neuropathy: A systematic review". Journal of Diabetes and Metabolic Disorders. 19 (2): 1995–2004. doi:10.1007/s40200-020-00652-8. PMC 7843894. PMID 33553048.{{cite journal}}: CS1 maint: PMC embargo expired (link)
  37. ↑ Arad Y, Fonseca V, Peters A, Vinik A (April 2011). "Beyond the monofilament for the insensate diabetic foot: a systematic review of randomized trials to prevent the occurrence of plantar foot ulcers in patients with diabetes". Diabetes Care. 34 (4): 1041–6. doi:10.2337/dc10-1666. PMC 3064020. PMID 21447666.
  38. ↑ Vos T, Flaxman AD, Naghavi M, Lozano R, Michaud C, Ezzati M, et al. (December 2012). "Years lived with disability (YLDs) for 1160 sequelae of 289 diseases and injuries 1990-2010: a systematic analysis for the Global Burden of Disease Study 2010". Lancet. 380 (9859): 2163–96. doi:10.1016/S0140-6736(12)61729-2. PMC 6350784. PMID 23245607.
  39. ↑ Snyder MJ, Gibbs LM, Lindsay TJ (August 2016). "Treating Painful Diabetic Peripheral Neuropathy: An Update". American Family Physician. 94 (3): 227–34. PMID 27479625.

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