Articles: neuralgia.
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Annals of neurology · Feb 1995
Randomized Controlled Trial Clinical TrialTopical lidocaine gel relieves postherpetic neuralgia.
Postherpetic neuralgia (PHN) following herpes zoster is a common and disabling neuropathic pain syndrome. In a double-blind, three-session study, 5% lidocaine gel or vehicle was applied simultaneously to both the area of pain and to the contralateral mirror-image unaffected skin. In the local session, lidocaine gel was applied to the painful skin area. ⋯ Remote lidocaine application to mirror-image skin was no different from placebo. No systemic adverse effects were reported and blood levels did not exceed 0.6 microgram/ml. Topical application of 5% lidocaine gel relieves PHN pain by a direct drug action on painful skin.
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Six patients undergoing paravertebral blocks for chronically painful conditions of the chest wall were thermographically imaged so that the extent of cutaneous vasodilatation and hence sympathetic block could be correlated with the distribution of the somatic block. All blocks were performed by a single experienced operator, with a single percutaneous entry, using 15 ml of 0.5% bupivacaine at a mean level of T9-10 (range T7-8--T10-11), with radiological confirmation of correct needle placement. There was a mean distribution of the somatic block of five dermatomes (range 1-8), as evidenced by loss of pinprick sensation, with upper and lower limits of T6 and L3. ⋯ No significant postural changes in blood pressures were seen, although there was a small but significant decrease in supine heart rate (p = 0.05). This study demonstrates that a large unilateral somatic and sympathetic block is obtainable with a single thoracic percutaneous paravertebral injection. It challenges the suggestions that this method of analgesia is ineffective and hazardous, that a sympathetic component is a rare accompaniment and that the lumbar nerve roots are spared.
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Effective treatment of patients with trigeminal neuralgia is often a long and complicated procedure. The symptoms of trigeminal neuralgia are clearly defined in most cases. Sudden and brief episodes of severe and stabbing pain (tic douloureux) occur, with pain usually starting from a trigger point. Recent reports suggest 80-90% suppression of pain with various treatment regimens, which seems to indicate that the diagnosis and successful treatment of the disorder are no longer a major problem. In fact, however, the intense suffering of patients and isolated reports in the literature suggest that there are still considerable diagnostic difficulties. Patients are referred from one specialist to another, in most cases without the necessary interdisciplinary cooperation, and countless interventions and attempts at therapy not only remain unsuccessful, but may cause serious adverse effects. ⋯ Apparently there is a considerable need for more information about the clinical symptoms, cause, diagnosis and therapy of trigeminal neuralgia, especially as the symptoms are often no longer typical because they have become chronic or are the result of previous treatment. This is needed by all specialists involved, including dentists and general practitioners. In patients in whom clinical criteria suggest the diagnosis of trigeminal neuralgia, drug treatment should be initiated immediately in consultation with the neurologist or neurosurgeon. For cases in which drug treatment fails or resistance to the drug develops surgical treatments are available, such as non-destructive microvascular decompression or thermocoagulation of the gasserian ganglion.
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Unfortunately, sharp, severe pain in the area of distribution of the fifth cranial nerve is frequently termed trigeminal neuralgia, and no differentiation is made between typical and atypical neuralgia and other types of facial pain disorders. This can lead to inadequate treatment. ⋯ The process of differential diagnosis is critical in trigeminal neuralgia, because an incorrent or missed diagnosis is one of the most frequent causes of treatment failure. As idiopathic trigeminal neuralgia, craniomandibular disorders or the cervical spine syndrome can involve similar symptoms and response to the use of medication, close interdisciplinary cooperation in the process of diagnosis is recommended.
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Acta Neurochir. Suppl. · Jan 1995
Cortical stimulation for central neuropathic pain: 3-D surface MRI for easy determination of the motor cortex.
Motor cortex electric stimulation has been reported to be effective for the treatment of central post-stroke pain and trigeminal neuropathic pain. Five patients with pain due to injury of the trigeminal nerve and with abnormalities of facial sensibility, as well as two patients suffering of a post-stroke thalamic pain, were subjected to stimulation applied epidurally on the motor cortex. Quadripolar electrodes were implanted under local anaesthesia and the precise location of the motor cortex was determined on three-dimensional surface MRI the day prior to surgery. In our experience, correct topographic localization of the electrode on the motor cortex seems to be crucial to obtain pain reduction.