Spinal cord stimulation: "neural switch" in complex regional pain syndrome type I. 2009

Kayode A Williams, and Kau Korto, and Steven P Cohen
Department of Anesthesiology and Critical Care Medicine, Johns Hopkins School of Medicine, 550North Broadway Suite 309A, Baltimore, MD 21205, USA. kwilli64@jhmi.edu

BACKGROUND Complex regional pain syndrome type I (CRPS I) is a neuropathic pain disorder of unclear etiology. It commonly follows a trivial injury and is characterized by spontaneous pain manifesting regionally that is disproportionate to the inciting event. Associated signs and symptoms include allodynia, hyperalgesia, edema, sudomotor, vasomotor abnormalities, and trophic changes. Although multiple modalities exist to treat CRPS I, significant disability, diminution in quality of life, and reduction in overall health often accompany the syndrome. METHODS A case of a 57-year-old man with CRPS I who was treated with spinal cord stimulation (SCS) after failing conservative therapy is presented. One month following treatment, he experienced complete symptom resolution such that stimulation was subsequently discontinued without recurrence over the 1-year follow-up period. CONCLUSIONS To date there is currently no reliably validated "cure" for CRPS. There has only been one recent report where SCS resulted in the complete eradication of the signs and symptoms associated with CRPS. This series involved adolescent girls aged 11-14 years of age, who tend to have a more benign and self-limited treatment course than that seen in adults. This raises the question as to whether a "neural switch" exists, and if so, where it is located. We postulate that the inter-neuronal connections between the central and peripheral nervous systems implicated by the current pathophysiological model is the most plausible site of this "neural switch," and that reorganization of this interface can account for the ability of SCS to effect a complete "cure" in CRPS.

UI MeSH Term Description Entries
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D010146 Pain An unpleasant sensation induced by noxious stimuli which are detected by NERVE ENDINGS of NOCICEPTIVE NEURONS. Suffering, Physical,Ache,Pain, Burning,Pain, Crushing,Pain, Migratory,Pain, Radiating,Pain, Splitting,Aches,Burning Pain,Burning Pains,Crushing Pain,Crushing Pains,Migratory Pain,Migratory Pains,Pains, Burning,Pains, Crushing,Pains, Migratory,Pains, Radiating,Pains, Splitting,Physical Suffering,Physical Sufferings,Radiating Pain,Radiating Pains,Splitting Pain,Splitting Pains,Sufferings, Physical
D011859 Radiography Examination of any part of the body for diagnostic purposes by means of X-RAYS or GAMMA RAYS, recording the image on a sensitized surface (such as photographic film). Radiology, Diagnostic X-Ray,Roentgenography,X-Ray, Diagnostic,Diagnostic X-Ray,Diagnostic X-Ray Radiology,X-Ray Radiology, Diagnostic,Diagnostic X Ray,Diagnostic X Ray Radiology,Diagnostic X-Rays,Radiology, Diagnostic X Ray,X Ray Radiology, Diagnostic,X Ray, Diagnostic,X-Rays, Diagnostic
D012019 Reflex Sympathetic Dystrophy A syndrome characterized by severe burning pain in an extremity accompanied by sudomotor, vasomotor, and trophic changes in bone without an associated specific nerve injury. This condition is most often precipitated by trauma to soft tissue or nerve complexes. The skin over the affected region is usually erythematous and demonstrates hypersensitivity to tactile stimuli and erythema. (Adams et al., Principles of Neurology, 6th ed, p1360; Pain 1995 Oct;63(1):127-33) Algodystrophy,Complex Regional Pain Syndrome, Type I,Pain Syndrome Type I, Regional, Complex,Shoulder-Hand Syndrome,Sudek Atrophy,Algodystrophic Syndrome,CRPS Type I,Cervical Sympathetic Dystrophy,Pain Syndrome Type I, Complex Regional,RSD (Reflex Sympathetic Dystrophy),Reflex Sympathetic Dystrophy Syndrome,Sudek's Atrophy,Sympathetic Reflex Dystrophia,Syndrome, Reflex Sympathetic Dystrophy,Type I Complex Regional Pain Syndrome,Algodystrophies,Atrophies, Sudek's,Atrophy, Sudek,Atrophy, Sudek's,CRPS Type Is,Cervical Sympathetic Dystrophies,Dystrophies, Cervical Sympathetic,Dystrophies, Reflex Sympathetic,Dystrophy, Cervical Sympathetic,Dystrophy, Reflex Sympathetic,RSDs (Reflex Sympathetic Dystrophy),Reflex Dystrophia, Sympathetic,Reflex Sympathetic Dystrophies,Shoulder Hand Syndrome,Shoulder-Hand Syndromes,Sudek's Atrophies,Sudeks Atrophy,Sympathetic Dystrophies, Cervical,Sympathetic Dystrophies, Reflex,Sympathetic Dystrophy, Cervical,Sympathetic Dystrophy, Reflex,Sympathetic Reflex Dystrophias,Syndrome, Algodystrophic,Syndrome, Shoulder-Hand,Syndromes, Shoulder-Hand,Type I, CRPS
D003509 Cyclohexanecarboxylic Acids Carboxylic acid derivatives of cyclohexane. Acids, Cyclohexanecarboxylic
D004567 Electrodes, Implanted Surgically placed electric conductors through which ELECTRIC STIMULATION is delivered to or electrical activity is recorded from a specific point inside the body. Implantable Electrodes,Implantable Stimulation Electrodes,Implanted Electrodes,Implanted Stimulation Electrodes,Electrode, Implantable,Electrode, Implantable Stimulation,Electrode, Implanted,Electrode, Implanted Stimulation,Electrodes, Implantable,Electrodes, Implantable Stimulation,Electrodes, Implanted Stimulation,Implantable Electrode,Implantable Stimulation Electrode,Implanted Electrode,Implanted Stimulation Electrode,Stimulation Electrode, Implantable,Stimulation Electrode, Implanted,Stimulation Electrodes, Implantable,Stimulation Electrodes, Implanted
D004599 Electric Stimulation Therapy Application of electric current in treatment without the generation of perceptible heat. It includes electric stimulation of nerves or muscles, passage of current into the body, or use of interrupted current of low intensity to raise the detection threshold of the skin to pain. Electrotherapy,Electrical Stimulation Therapy,Interferential Current Electrotherapy,Therapeutic Electric Stimulation,Therapeutic Electrical Stimulation,Therapy, Electric Stimulation,Electric Stimulation, Therapeutic,Electrical Stimulation, Therapeutic,Electrotherapy, Interferential Current,Stimulation Therapy, Electric,Stimulation Therapy, Electrical,Stimulation, Therapeutic Electric,Stimulation, Therapeutic Electrical,Therapy, Electrical Stimulation
D005596 Fractures, Closed Fractures in which the break in bone is not accompanied by an external wound. Fractures, Occult,Closed Fracture,Closed Fractures,Fracture, Closed,Fracture, Occult,Occult Fracture,Occult Fractures
D005680 gamma-Aminobutyric Acid The most common inhibitory neurotransmitter in the central nervous system. 4-Aminobutyric Acid,GABA,4-Aminobutanoic Acid,Aminalon,Aminalone,Gammalon,Lithium GABA,gamma-Aminobutyric Acid, Calcium Salt (2:1),gamma-Aminobutyric Acid, Hydrochloride,gamma-Aminobutyric Acid, Monolithium Salt,gamma-Aminobutyric Acid, Monosodium Salt,gamma-Aminobutyric Acid, Zinc Salt (2:1),4 Aminobutanoic Acid,4 Aminobutyric Acid,Acid, Hydrochloride gamma-Aminobutyric,GABA, Lithium,Hydrochloride gamma-Aminobutyric Acid,gamma Aminobutyric Acid,gamma Aminobutyric Acid, Hydrochloride,gamma Aminobutyric Acid, Monolithium Salt,gamma Aminobutyric Acid, Monosodium Salt

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