Pain physician
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Interventional pain management dates back to the origins of neural blockade and regional analgesia. Over the years, it evolved into a distinct specialty with the application of interventional techniques beyond those of simple neural blockade. The first therapeutic nerve block in pain management was described in 1899 by Tuffer. ⋯ Diagnostic blockade in pain management was pioneered by von Gaza with the use of procaine for determining the pathways of obscure pain. Interventional pain management has entered into the modern era in the twenty-first century, driven by contributions from pioneers including Bonica, Winnie, Raj, Racz, Bogduk, and others. This historical review examines the origins of interventional pain management, its pathophysiologic basis, the role of precision diagnostic interventional techniques, therapeutic interventional techniques, and the future of interventional pain management.
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Radiofrequency heat lesioning has been advocated to prolong the duration of therapeutic effect of lumbar sympathetic block in Complex Region Pain Syndrome (CRPS) of the lower extremity. Prior to radiofrequency lesioning of the lumbar sympathetic trunk, sensory and motor stimulation may be used to verify that the active needle tip is not adjacent to a spinal nerve to avoid unwanted neural injury. However, the value of sensory stimulation to aid in precise needle positioning at the desired target remains controversial. ⋯ Motor stimulation did not occur up to the maximum voltage tested (2.0 V at 2 Hz) Sensory stimulation of the lumbar sympathetic trunk may be used to aid in localization of the active tip of the radiofrequency needle, in preparation for lesioning. A dermatomal sensory pattern was observed, suggesting that afferent sensory fibers travel in the lumbar sympathetic trunk. The implications of this observation for understanding the mechanism of CRPS-related pain are discussed.
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Epidural adhesiolysis with spinal endoscopy is an emerging interventional pain management technique in managing chronic refractory low back and lower extremity pain. However, there is a lack of significant data demonstrating the effectiveness of spinal endoscopic adhesiolysis. This randomized, double-blind controlled trial was undertaken to determine the ability of spinal endoscopic adhesiolysis to reduce pain and improve functional and psychological status. ⋯ Based on the definition that less than 6 months of relief is considered as short-term and longer than 6 months is considered as long-term, a significant number of patients obtained long-term relief. The results showed significant improvement in patients undergoing spinal endoscopic adhesiolysis at 1-month, 3-months, and 6-months, compared to baseline measurements, as well as compared to the control group without adhesiolysis. Spinal endoscopic adhesiolysis with targeted injection of local anesthetic and steroid, is an effective treatment in a significant number of patients without major adverse effects at 6-month follow-up.
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Epidural injections with or without steroids are used extensively in the management of chronic spinal pain. However, evidence is contradictory with continuing debate about the value of epidural steroid injections in chronic spinal syndromes. The objective of this systematic review is to determine the effectiveness of epidural injections in the treatment of chronic spinal pain. ⋯ Further, evidence was moderate for caudal epidural injections in managing lumbar radicular pain. The evidence in management of chronic neck pain, chronic low back pain, cervical radiculopathy, spinal stenosis, and post laminectomy syndrome was limited or inconclusive. In conclusion, the evidence of effectiveness of transforaminal epidural injections in managing lumbar nerve root pain was strong, whereas, effectiveness of caudal epidural injections in managing lumbar radiculopathy was moderate, while there was limited or inconclusive evidence of effectiveness of epidural injections in managing chronic spinal pain without radiculopathy, spinal stenosis, post lumbar laminectomy syndrome, and cervical radiculopathy.
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The prevalence of illicit drug use by patients in a chronic pain management practice who concomitantly abuse prescription-controlled substances is not known. The purpose of this study was to determine the prevalence of illicit drug use by patients in an interventional pain management practice, based on whether or not there was evidence of simultaneous abuse of prescription drugs. One hundred and fifty patients in an interventional pain management practice who were prescribed controlled substances for pain treatment were selected for assessment of concomitant illicit drug use by urine drug testing. ⋯ Marijuana was the drug of choice in both groups, with 22% in the prescription abuse group and 10% in the non-abuse group. The second most commonly used illicit drug in both groups was cocaine. This study demonstrated a clinically significant use of illicit drugs, particularly marijuana and cocaine in an interventional pain management setting, in patients with or without evidence of concomitant abuse of prescription controlled substances.