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      PAIN SYNDROMES AFTER MISSILE-CAUSED PERIPHERAL NERVE LESIONS

      1 , 2
      Neurosurgery
      Ovid Technologies (Wolters Kluwer Health)

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          Abstract

          To analyze treatment procedures and treatment outcomes of painful missile-caused nerve injuries and factors influencing the outcome.

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          Most cited references63

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          Anticonvulsant drugs for management of pain: a systematic review.

          To determine effectiveness and adverse effects of anticonvulsant drugs in management of pain. Systematic review of randomised controlled trials of anticonvulsants for acute, chronic, or cancer pain identified by using Medline, by hand searching, by searching reference lists, and by contacting investigators. Between 1966 and February 1994, 37 reports were found; 20 reports, of four anticonvulsants, were eligible. Numbers needed to treat were calculated for effectiveness, adverse effects, and drug related withdrawal from study. The only placebo controlled study in acute pain found no analgesic effect of sodium valproate. For treating trigeminal neuralgia, carbamazepine had a combined number needed to treat of 2.6 for effectiveness, 3.4 for adverse effects, and 24 for severe effects (withdrawal from study). For treating diabetic neuropathy, anticonvulsants had a combined number needed to treat of 2.5 for effectiveness, 3.1 for adverse effects, and 20 for severe effects. For migraine prophylaxis, anticonvulsants had a combined number needed to treat of 1.6 for effectiveness, 2.4 for adverse effects, and 39 for severe effects. Phenytoin had no effect on the irritable bowel syndrome, and carbamazepine had little effect on pain after stroke. Clonazepam was effective in one study for temporomandibular joint dysfunction. No study compared one anticonvulsant with another. Anticonvulsants were effective for trigeminal neuralgia and diabetic neuropathy and for migraine prophylaxis. Minor adverse effects occurred as often as benefit.
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            Gabapentin in neuropathic pain syndromes: a randomised, double-blind, placebo-controlled trial.

            A double-blind, randomised, placebo-controlled 8-week study was conducted to evaluate the efficacy and safety of gabapentin in the treatment of neuropathic pain, using doses up to 2400 mg/day. The study used a novel design that was symptom- rather than syndrome-based; an approach that aimed to reflect the realities of clinical practice. Participants had a wide range of neuropathic pain syndromes, with at least two of the following symptoms: allodynia, burning pain, shooting pain, or hyperalgesia. Patients were randomised to gabapentin (n=153) or placebo (n=152). Gabapentin was given in three divided doses, initially titrated to 900 mg/day over 3 days, followed by two further increases, to a maximum of 2400 mg/day if required by the end of week 5. The primary outcome measure was changed in average daily pain diary score (baseline versus final week). Over the 8 week study, this score decreased (i.e. improved) by 1.5 (21%) in gabapentin treated patients and by 1.0 (14%) in placebo treated patients (P=0.048, rank-based analysis of covariance). Significant differences were shown in favour of gabapentin (P<0.05) for the Clinician and Patient Global Impression of Change, and some domains of the Short Form-McGill Pain Questionnaire. Improvements were also shown in patient-reported outcomes in quality of life, as seen by significant differences in favour of gabapentin in several domains of the Short-Form-36 Health Survey. Gabapentin was well tolerated and the majority of patients completed the study (79 versus 73% for placebo). The most common adverse events were mild to moderate dizziness and somnolence, most of which were transient and occurred during the titration phase. This study shows that gabapentin reduces pain and improves some quality-of-life measures in patients with a wide range of neuropathic pain syndromes.
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              A critical review of controlled clinical trials for peripheral neuropathic pain and complex regional pain syndromes.

              The purpose of this review was to identify and analyze the controlled clinical trial data for peripheral neuropathic pain (PNP) and complex regional pain syndromes (CRPS). A total of 72 articles were found, which included 92 controlled drug trials using 48 different treatments. The methods of these studies were critically reviewed and the results summarized and compared. The PNP trial literature gave consistent support (two or more trials) for the analgesic effectiveness of tricyclic antidepressants, intravenous and topical lidocaine, intravenous ketamine, carbamazepine and topical aspirin. There was limited support (one trial) for the analgesic effectiveness of oral, topical and epidural clonidine and for subcutaneous ketamine. The trial data were contradictory for mexiletine, phenytoin, topical capsaicin, oral non-steroidal anti-inflammatory medication, and intravenous morphine. Analysis of the trial methods indicated that mexiletine and intravenous morphine were probably effective analgesics for PNP, while non-steroidals were probably ineffective. Codeine, magnesium chloride, propranolol, lorazepam, and intravenous phentolamine all failed to provide analgesia in single trials. There were no long-term data supporting the analgesic effectiveness of any drug and the etiology of the neuropathy did not predict treatment outcome. Review of the controlled trial literature for CRPS identified several potential problems with current clinical practices. The trial data only gave consistent support for analgesia with corticosteroids, which had long-term effectiveness. There was limited support for the analgesic effectiveness of topical dimethylsulfoxyde (DMSO), epidural clonidine and intravenous regional blocks (IVRBs) with bretylium and ketanserin. The trial data were contradictory for intranasal calcitonin and intravenous phentolamine and analysis of the trial methods indicated that both treatments were probably ineffective for most patients. There were consistent trial data indicating that guanethidine and reserpine IVRBs were ineffective, and limited trial data indicating that droperidol and atropine IVRBs were ineffective. No placebo controlled data were available to evaluated sympathetic ganglion blocks (SGBs) with local anesthetics, surgical sympathectomy, or physical therapy. Only the capsaicin trials presented data which allowed for meta-analysis. This meta-analysis demonstrated a significant capsaicin effect with a pooled odds ratio of 2.35 (95% confidence intervals 1.48, 3.22). The methods scores were higher (P < 0.01) for the PNP trials (66.2 +/- 1.5, n = 66) than the CRPS trials (57.6 +/- 2.9, n = 26). The CRPS trials tended to use less subjects and were less likely to use placebo controls, double-blinding, or perform statistical tests for differences in outcome measures between groups. There was almost no overlap in the controlled trial literature between treatments for PNP and CRPS, and treatments used in both conditions (intravenous phentolamine and epidural clonidine) had similar results.
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                Author and article information

                Journal
                Neurosurgery
                Ovid Technologies (Wolters Kluwer Health)
                0148-396X
                1524-4040
                December 2006
                December 01 2006
                December 2006
                December 01 2006
                : 59
                : 6
                : 1238-1251
                Affiliations
                [1 ] Neurosurgical Department, Military Medical Academy, Belgrade, Serbia
                [2 ] Psychiatric Department, Military Medical Academy, Belgrade, Serbia
                Article
                10.1227/01.NEU.0000245618.16979.32
                17277686
                84de2bf3-0dd3-4ce6-875a-b05c38fd8a50
                © 2006
                History

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