The Clinical journal of pain
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Recent research advances indicate that specialized neural pathways are involved in the encoding of pain sensations and that these pathways are sensitive to changes in stimulus features, such as intensity, quality, duration, and location. It has also been established that there are three major families of opioid peptides in the brain: the enkephalins, the dynorphins, and the endorphins. In addition to these opioid peptides, other neurochemicals such as serotonin and norepinephrine play a role in the modulation of signals related to tissue damage. ⋯ Opioid drugs are administered into the membranes surrounding the spinal cord to provide long-lasting pain relief. Peripherally acting opioid drugs may represent a new functional class of analgesics devoid of the undesirable side effects of centrally acting opioids. Tricyclic antidepressant drugs are used in the treatment of neuropathic pain, based on their effects on noradrenergic and serotoninergic pathways in the central nervous system.
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The development of an acute pain service in a community hospital is described. A plan of operation is proposed, including accurate record maintenance to avoid complications. Results are presented on over 10,000 patients treated by the acute pain service.
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Opioid receptors are described and differentiated by their affinities for specific agonists and antagonists. Their sites of action and receptor activities are discussed. Tachyphylaxis and tolerance are described and methods for overcoming these problems are recommended. Suggestions are made regarding future drugs to act at specific receptors.
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Capsaicin application to human nasal mucosa was found to induce painful sensation, sneezing, and nasal secretion. All of these factors exhibit desensitization upon repeated applications. The acute effects induced by capsaicin (300 micrograms/100 microliters) application to the nasal mucosa were studied in healthy volunteers and cluster headache patients. ⋯ Likewise, the time course of desensitization to the painful sensation and nasal secretion induced by capsaicin applied for five consecutive days in control subjects was almost superimposable to those observed in the nasal mucosa of cluster headache patients. The number of spontaneously occurring attacks was significantly reduced in the 60 days after the end of capsaicin treatment. Whether the beneficial effect induced by capsaicin application to the nasal mucosa could be ascribed to a specific action on sensory neurons remains unknown.
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An inpatient headache treatment unit provides a special environment for those patients whose headaches have failed to respond to outpatient therapy. Outpatient therapy may be precluded for a variety of treatment issues, including detoxification, initiation of copharmacy prophylactic medical therapy, and intravenous treatment for intractable chronic cluster headache and status migrainous headache. These complex medical treatments are viewed as some of the most valuable therapies by the patients and, at least in part, significantly decrease both headache indexes utilized in this survey. ⋯ Treatment failures may be due to variations in the etiology of chronic muscle contraction headache and posttraumatic headache. Denial of psychological factors in headache may also contribute to treatment failure. Habituation to analgesics and ergots may decrease patient response as compared with those not dependent.