Postherpetic neuralgia is a nerve pain due to damage caused by the varicella zoster virus. Typically, the neuralgia is confined to a dermatomic area of the skin and follows an outbreak of herpes zoster (commonly known as shingles) in that same dermatomic area. The neuralgia typically begins when the herpes zoster vesicles have crusted over and begun to heal, but it can begin in the absence of herpes zoster, in which case zoster sine herpete is presumed (see Herpes zoster).
Treatment options for postherpetic neuralgia include antidepressants, anticonvulsants (such as gabapentin, pregabalin, or topiramate), gabapentin enacarbil (a prodrug of gabapentin) and topical agents such as lidocaine patches or capsaicin lotion. Opioid analgesics may also be appropriate in many situations. There are some sporadically successful experimental treatments, such as rhizotomy (severing or damaging the affected nerve to relieve pain) and TENS (a type of electrical pulse therapy).
Postherpetic neuralgia is thought to be nerve damage caused by herpes zoster. The damage causes nerves in the affected dermatomic area of the skin to send abnormal electrical signals to the brain. These signals may convey excruciating pain, and may persist or recur for months, years, or for life.
A key factor in the neural plasticity underlying neuropathic pain is altered gene expression in sensory dorsal root ganglia neurons. Injury to sensory nerves induces neurochemical, physiological and anatomical modifications to afferent and central neurons, such as afferent terminal sprouting and inhibitory interneuron loss. Following nerve damage, NaCl channel accumulation causes hyperexcitability, and downregulation of the TTX-resistant Nav1.8 (sensory neuron specific, SNS1) channel and upregulation of TTX-sensitive Nav1.3 (brain type III) and TRPV1 channels. These changes contribute to increased NMDA glutamate receptor-dependent excitability of spinal dorsal horn neurons and are restricted to the ipsilateral (injured) side. A combination of these factors could contribute to the neuropathic pain state of postherpetic neuralgia.
In the United States each year approximately 1,000,000 individuals develop herpes zoster. Of those individuals approximately 20%, or 200,000 individuals, develop postherpetic neuralgia.
Less than 10 percent of people younger than 60 develop postherpetic neuralgia after a bout of herpes zoster, while about 40 percent of people older than 60 do.
Race: It may influence susceptibility to herpes zoster. African Americans are one fourth as likely as Caucasians to develop this condition.
Often an older, debilitated or immune compromised population.
Signs and symptoms
With resolution of the herpes zoster eruption, pain that continues for three months or more is defined as postherpetic neuralgia.
Pain is variable, from discomfort to very severe, and may be described as burning, stabbing, or gnawing.
Area of previous herpes zoster may show evidence of cutaneous scarring.
Sensation may be altered over the areas involved, in the form of either hypersensitivity or decreased sensation.
In rare cases, the patient might also experience muscle weakness, tremor, or paralysis if the nerves involved also control muscle movement.
Pleocytosis is observed in 46%, elevated protein in 26%, and VZV DNA in 22%.
These findings are not predictive of the clinical course of postherpetic neuralgia.
Viral culture or immunofluorescence staining may be used to differentiate herpes simplex from herpes zoster in cases that are difficult to distinguish clinically.
Antibodies to herpes zoster can be measured. A 4-fold increase has been used to support the diagnosis of subclinical herpes zoster (zoster sine herpete). However, a rising titer secondary to viral exposure rather than reactivation cannot be ruled out.
Magnetic resonance imaging lesions attributable to herpes zoster were seen in the brain stem and cervical cord in 56% (9/16) of patients.
At three months after onset of herpes zoster, 56% (5/9) of patients with an abnormal magnetic resonance image had developed postherpetic neuralgia.
Of the seven patients who had no herpes-zoster-related lesions on the magnetic resonance image, none had residual pain.
Treatment for postherpetic neuralgia depends on the type and characteristics of pain experienced by the patient. Pain control is essential to quality patient care; it ensures patient comfort. Possible options include:
Antiviral agents, such as famciclovir, are given at the onset of attacks of herpes zoster to shorten the clinical course and to help prevent complications such as postherpetic neuralgia. However, they have no role to play following the acute attack once postherpetic neuralgia has become established.
Aspirin mixed into an appropriate solvent such as diethyl ether may reduce pain.
Gallium maltolate in a cream or ointment base has been reported to relieve refractory postherpetic neuralgia.
Lidocaine skin patches. These are small, bandage-like patches that contain the topical, pain-relieving medication lidocaine. The patches, available by prescription, must be applied directly to painful skin and deliver relief for four to 12 hours. Patches containing lidocaine can also be used on the face, taking care to avoid mucus membranes e.g., the eyes, nose and mouth.
Opioids provide more potent pain control and the weaker members such as codeine may be available over the counter in combination with paracetamol (co-codamol). Other opioids are prescription-only and include higher dosages of codeine, tramadol, morphine or fentanyl. Most opioids have sedating properties, which are beneficial for patients who experience pain.
Anticonvulsants. These agents are used to manage severe muscle spasms and provide sedation in neuralgia. They have central effects on pain modulation. Medications such as phenytoin (Dilantin, Phenytek), used to treat seizures, also can lessen the pain associated with postherpetic neuralgia. The medications stabilize abnormal electrical activity in the nervous system caused by injured nerves. Doctors often prescribe another anticonvulsant called carbamazepine (Carbatrol, Tegretol) for sharp, jabbing pain. Newer anticonvulsants, such as gabapentin (Neurontin) and lamotrigine (Lamictal), are generally tolerated better and can help control burning and pain.
gabapentin enacarbil (HORIZANT), an alpha-2-delta-1 ligand and a prodrug of gabapentin, was approved by the FDA in 2012 for the management of postherpetic neuralgia.
Spinal cord stimulator. The electrical stimulation of the posterior spinal cord works by activating supraspinal and spinal inhibitory pain mechanisms.
In some cases, treatment of postherpetic neuralgia brings complete pain relief. But most people still experience some pain, and a few do not receive any relief. Although some people must live with postherpetic neuralgia the rest of their lives, most people can expect the condition to gradually disappear on its own within five years.
The natural history of postherpetic neuralgia involves slow resolution of the pain syndrome. In those patients who develop postherpetic neuralgia, most respond to agents such as the tricyclic antidepressants. A subgroup of patients may develop severe, long-lasting pain that does not respond to medical therapy. Continued research for new agents is necessary.
In 1995, the Food and Drug Administration (FDA) approved the Varicella vaccine to prevent chickenpox. Its effect on postherpetic neuralgia is still unknown. The vaccine—made from a weakened form of the varicella-zoster virus—may keep chickenpox from occurring in nonimmune children and adults, or at least lessen the risk of the chickenpox virus lying dormant in the body and reactivating later as shingles. If shingles could be prevented, postherpetic neuralgia could be completely avoided.
^Brian J. Hall, John C. Hall. "Infectious diseases in the skin". Sauer's Manual of Skin Diseases. Lippincott Williams & Wilkins, 2010. p. 232.
^De Benedittis G, Besana F, Lorenzetti A (1992). "A new topical treatment for acute herpetic neuralgia and post-herpetic neuralgia: the aspirin/diethyl ether mixture. An open-label study plus a double-blind controlled clinical trial". Pain48 (3): 383–90. doi:10.1016/0304-3959(92)90088-S. PMID1594261.
^Bowsher D (1997). "The effects of pre-emptive treatment of postherpetic neuralgia with amitriptyline: a randomized, double-blind, placebo-controlled trial". Journal of pain and symptom management13 (6): 327–31. doi:10.1016/S0885-3924(97)00077-8. PMID9204652.