Neurology
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A variety of mechanisms may generate pain resulting from injury to the peripheral nervous system. None of these mechanisms is disease-specific, and several different pain mechanisms may be simultaneously present in any one patient, independent of diagnosis. Diagnosis of neuropathic pain is often easily made from information gathered on neurologic examination and from patient history. ⋯ An adequate trial for each agent tried is key to pharmacologic treatment of neuropathic pain. Tricyclic antidepressants are first-line agents, although other drugs, including anticonvulsants, local anesthetic antiarrhythmics, clonidine, opioids, and certain topical agents, also offer pain relief in some patient populations. The novel antidepressants venlafaxine and nefazodone are potentially useful new drugs that are better tolerated than tricyclic antidepressants.
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Postherpetic neuralgia, when defined as neuropathic pain persisting 1 month or longer after herpes zoster infection, affects about 10% of all patients who have contracted the disease. The incidence of postherpetic neuralgia increases with age; at age 60, about 50% of herpes zoster patients will suffer significant pain, and this proportion grows with subsequent decades. If therapy is carefully chosen and monitored, it is possible to give satisfactory relief, taking pain from severe to mild, to between 60 and 70% of patients. This article will review current treatment and focus on antidepressant drugs, treatments that are contentious and of current interest such as topical agents, and the use of opioids for this type of chronic neuropathic pain.
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The neurologist is an important part of the pain management team. Factors that can alter presentation and complicate establishing a diagnosis are reviewed. ⋯ Treatment planning consists of addressing potential sources of failure of pain management, setting appropriate goals, and using the diagnostic assessment to plan pharmacologic and nonpharmacologic interventions based on pain mechanisms. Even if pharmacologic interventions do not alter pain, an education-oriented behavioral pain program integrated with physical therapy can improve function and foster self-reliance in controlling pain.