Neurogenic hyperalgesia: psychophysical studies of underlying mechanisms

R. H. LaMotte, C. N. Shain, D. A. Simone and E. F. Tsai Department of Anesthesiology, Yale University School of Medicine, New Haven, Connecticut 06510. 1. Psychophysical studies were made, in humans, of the sensory characteristics and underlying mechanisms of the hyperalgesia (often termed "sec...

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Veröffentlicht in:Journal of neurophysiology 1991-07, Vol.66 (1), p.190-211
Hauptverfasser: LaMotte, R. H, Shain, C. N, Simone, D. A, Tsai, E. F
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Shain, C. N
Simone, D. A
Tsai, E. F
description R. H. LaMotte, C. N. Shain, D. A. Simone and E. F. Tsai Department of Anesthesiology, Yale University School of Medicine, New Haven, Connecticut 06510. 1. Psychophysical studies were made, in humans, of the sensory characteristics and underlying mechanisms of the hyperalgesia (often termed "secondary hyperalgesia") that occurs in uninjured skin surrounding a local cutaneous injury. The hyperalgesia was characterized by lowered pain thresholds and enhanced magnitude of pain to normally painful stimuli. The "injury" was produced by a single intradermal injection of 10 microliters of 100 micrograms of capsaicin, the algesic substance in hot chili peppers. 2. On injection of capsaicin into the volar forearm, the subjects experienced intense burning pain, accompanied immediately by the formation of three areas of hyperalgesia surrounding the injection site. The largest mean area (55 cm2) was hyperalgesic to a normally painful punctate stimulation of the skin. Nested within this was an area of tenderness to gentle stroking (38 cm2) and a much smaller area of hyperalgesia to heat (2 cm2). An area of analgesia to pinprick, approximately 4 mm in diameter and centered on the injection site, developed within minutes and typically disappeared within 24 h. The hyperalgesia to heat and to stroking disappeared within 1-2 h, whereas the hyperalgesia to punctate stimuli, although gradually decreasing in area, lasted from 13 to 24 h. 3. The radial spread of the mechanical hyperalgesia (to punctate and stroking stimuli) away from the injury was dependent on neural activity and not produced, for example, by algesic substances transported away from the injury. The injection of capsaicin into a small area of anesthetized skin did not produce hyperalgesia in the surrounding, unanesthetized skin. Also, the hyperalgesia in normal skin readily crossed a tight arm band that blocked the circulation of blood and lymph. 4. The spread of mechanical hyperalgesia away from the injury was peripherally mediated via cutaneous nerve fibers because it was blocked by a thin mediolateral strip of cutaneous anesthesia placed 1 cm away from the capsaicin injection site. Hyperalgesia developed normally on the capsaicin side of the strip but not on the other side. 5. Heat stimulation of the skin that produced pain that was equivalent in magnitude and time course to that produced by an injection of capsaicin (10 micrograms) resulted in much smaller areas of mechanical hyperalgesia. It was postulated
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The radial spread of the mechanical hyperalgesia (to punctate and stroking stimuli) away from the injury was dependent on neural activity and not produced, for example, by algesic substances transported away from the injury. The injection of capsaicin into a small area of anesthetized skin did not produce hyperalgesia in the surrounding, unanesthetized skin. Also, the hyperalgesia in normal skin readily crossed a tight arm band that blocked the circulation of blood and lymph. 4. The spread of mechanical hyperalgesia away from the injury was peripherally mediated via cutaneous nerve fibers because it was blocked by a thin mediolateral strip of cutaneous anesthesia placed 1 cm away from the capsaicin injection site. Hyperalgesia developed normally on the capsaicin side of the strip but not on the other side. 5. Heat stimulation of the skin that produced pain that was equivalent in magnitude and time course to that produced by an injection of capsaicin (10 micrograms) resulted in much smaller areas of mechanical hyperalgesia. It was postulated that there exist special chemosensitive primary afferent nerve fibers that are more effective in producing mechanical hyperalgesia than are the known thermo- and mechanosensitive nociceptive nerve fibers. 6. 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Psychology ; Humans ; Hyperalgesia - chemically induced ; Hyperalgesia - etiology ; Hyperalgesia - physiopathology ; Lymph - physiology ; Male ; Middle Aged ; Nerve Fibers - physiology ; Nervous System Physiological Phenomena ; Neurons - physiology ; Pain - chemically induced ; Peripheral Nerves - cytology ; Peripheral Nerves - physiology ; Physical Stimulation - methods ; Psychophysics ; Regional Blood Flow ; Skin - blood supply ; Skin - drug effects ; Somesthesis and somesthetic pathways (proprioception, exteroception, nociception); interoception; electrolocation. 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N</creatorcontrib><creatorcontrib>Simone, D. A</creatorcontrib><creatorcontrib>Tsai, E. F</creatorcontrib><title>Neurogenic hyperalgesia: psychophysical studies of underlying mechanisms</title><title>Journal of neurophysiology</title><addtitle>J Neurophysiol</addtitle><description>R. H. LaMotte, C. N. Shain, D. A. Simone and E. F. Tsai Department of Anesthesiology, Yale University School of Medicine, New Haven, Connecticut 06510. 1. Psychophysical studies were made, in humans, of the sensory characteristics and underlying mechanisms of the hyperalgesia (often termed "secondary hyperalgesia") that occurs in uninjured skin surrounding a local cutaneous injury. The hyperalgesia was characterized by lowered pain thresholds and enhanced magnitude of pain to normally painful stimuli. The "injury" was produced by a single intradermal injection of 10 microliters of 100 micrograms of capsaicin, the algesic substance in hot chili peppers. 2. On injection of capsaicin into the volar forearm, the subjects experienced intense burning pain, accompanied immediately by the formation of three areas of hyperalgesia surrounding the injection site. The largest mean area (55 cm2) was hyperalgesic to a normally painful punctate stimulation of the skin. Nested within this was an area of tenderness to gentle stroking (38 cm2) and a much smaller area of hyperalgesia to heat (2 cm2). An area of analgesia to pinprick, approximately 4 mm in diameter and centered on the injection site, developed within minutes and typically disappeared within 24 h. The hyperalgesia to heat and to stroking disappeared within 1-2 h, whereas the hyperalgesia to punctate stimuli, although gradually decreasing in area, lasted from 13 to 24 h. 3. The radial spread of the mechanical hyperalgesia (to punctate and stroking stimuli) away from the injury was dependent on neural activity and not produced, for example, by algesic substances transported away from the injury. The injection of capsaicin into a small area of anesthetized skin did not produce hyperalgesia in the surrounding, unanesthetized skin. Also, the hyperalgesia in normal skin readily crossed a tight arm band that blocked the circulation of blood and lymph. 4. The spread of mechanical hyperalgesia away from the injury was peripherally mediated via cutaneous nerve fibers because it was blocked by a thin mediolateral strip of cutaneous anesthesia placed 1 cm away from the capsaicin injection site. Hyperalgesia developed normally on the capsaicin side of the strip but not on the other side. 5. Heat stimulation of the skin that produced pain that was equivalent in magnitude and time course to that produced by an injection of capsaicin (10 micrograms) resulted in much smaller areas of mechanical hyperalgesia. It was postulated that there exist special chemosensitive primary afferent nerve fibers that are more effective in producing mechanical hyperalgesia than are the known thermo- and mechanosensitive nociceptive nerve fibers. 6. Once developed, the mechanical hyperalgesia became only partially dependent on peripheral neural activity originating at the site of injury.</description><subject>Adult</subject><subject>Aged</subject><subject>Anesthesia, Local</subject><subject>Biological and medical sciences</subject><subject>Capsaicin</subject><subject>Central Nervous System - cytology</subject><subject>Central Nervous System - physiology</subject><subject>Female</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Humans</subject><subject>Hyperalgesia - chemically induced</subject><subject>Hyperalgesia - etiology</subject><subject>Hyperalgesia - physiopathology</subject><subject>Lymph - physiology</subject><subject>Male</subject><subject>Middle Aged</subject><subject>Nerve Fibers - physiology</subject><subject>Nervous System Physiological Phenomena</subject><subject>Neurons - physiology</subject><subject>Pain - chemically induced</subject><subject>Peripheral Nerves - cytology</subject><subject>Peripheral Nerves - physiology</subject><subject>Physical Stimulation - methods</subject><subject>Psychophysics</subject><subject>Regional Blood Flow</subject><subject>Skin - blood supply</subject><subject>Skin - drug effects</subject><subject>Somesthesis and somesthetic pathways (proprioception, exteroception, nociception); interoception; electrolocation. 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F</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c445t-f70f97e80172b1ca8a01da7751a48b48769431b9177a3b437d73c566a06744c63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1991</creationdate><topic>Adult</topic><topic>Aged</topic><topic>Anesthesia, Local</topic><topic>Biological and medical sciences</topic><topic>Capsaicin</topic><topic>Central Nervous System - cytology</topic><topic>Central Nervous System - physiology</topic><topic>Female</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Humans</topic><topic>Hyperalgesia - chemically induced</topic><topic>Hyperalgesia - etiology</topic><topic>Hyperalgesia - physiopathology</topic><topic>Lymph - physiology</topic><topic>Male</topic><topic>Middle Aged</topic><topic>Nerve Fibers - physiology</topic><topic>Nervous System Physiological Phenomena</topic><topic>Neurons - physiology</topic><topic>Pain - chemically induced</topic><topic>Peripheral Nerves - cytology</topic><topic>Peripheral Nerves - physiology</topic><topic>Physical Stimulation - methods</topic><topic>Psychophysics</topic><topic>Regional Blood Flow</topic><topic>Skin - blood supply</topic><topic>Skin - drug effects</topic><topic>Somesthesis and somesthetic pathways (proprioception, exteroception, nociception); interoception; electrolocation. Sensory receptors</topic><topic>Vertebrates: nervous system and sense organs</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>LaMotte, R. H</creatorcontrib><creatorcontrib>Shain, C. N</creatorcontrib><creatorcontrib>Simone, D. A</creatorcontrib><creatorcontrib>Tsai, E. F</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><jtitle>Journal of neurophysiology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>LaMotte, R. H</au><au>Shain, C. N</au><au>Simone, D. A</au><au>Tsai, E. F</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Neurogenic hyperalgesia: psychophysical studies of underlying mechanisms</atitle><jtitle>Journal of neurophysiology</jtitle><addtitle>J Neurophysiol</addtitle><date>1991-07-01</date><risdate>1991</risdate><volume>66</volume><issue>1</issue><spage>190</spage><epage>211</epage><pages>190-211</pages><issn>0022-3077</issn><eissn>1522-1598</eissn><coden>JONEA4</coden><abstract>R. H. LaMotte, C. N. Shain, D. A. Simone and E. F. Tsai Department of Anesthesiology, Yale University School of Medicine, New Haven, Connecticut 06510. 1. Psychophysical studies were made, in humans, of the sensory characteristics and underlying mechanisms of the hyperalgesia (often termed "secondary hyperalgesia") that occurs in uninjured skin surrounding a local cutaneous injury. The hyperalgesia was characterized by lowered pain thresholds and enhanced magnitude of pain to normally painful stimuli. The "injury" was produced by a single intradermal injection of 10 microliters of 100 micrograms of capsaicin, the algesic substance in hot chili peppers. 2. On injection of capsaicin into the volar forearm, the subjects experienced intense burning pain, accompanied immediately by the formation of three areas of hyperalgesia surrounding the injection site. The largest mean area (55 cm2) was hyperalgesic to a normally painful punctate stimulation of the skin. Nested within this was an area of tenderness to gentle stroking (38 cm2) and a much smaller area of hyperalgesia to heat (2 cm2). An area of analgesia to pinprick, approximately 4 mm in diameter and centered on the injection site, developed within minutes and typically disappeared within 24 h. The hyperalgesia to heat and to stroking disappeared within 1-2 h, whereas the hyperalgesia to punctate stimuli, although gradually decreasing in area, lasted from 13 to 24 h. 3. The radial spread of the mechanical hyperalgesia (to punctate and stroking stimuli) away from the injury was dependent on neural activity and not produced, for example, by algesic substances transported away from the injury. The injection of capsaicin into a small area of anesthetized skin did not produce hyperalgesia in the surrounding, unanesthetized skin. Also, the hyperalgesia in normal skin readily crossed a tight arm band that blocked the circulation of blood and lymph. 4. The spread of mechanical hyperalgesia away from the injury was peripherally mediated via cutaneous nerve fibers because it was blocked by a thin mediolateral strip of cutaneous anesthesia placed 1 cm away from the capsaicin injection site. Hyperalgesia developed normally on the capsaicin side of the strip but not on the other side. 5. Heat stimulation of the skin that produced pain that was equivalent in magnitude and time course to that produced by an injection of capsaicin (10 micrograms) resulted in much smaller areas of mechanical hyperalgesia. It was postulated that there exist special chemosensitive primary afferent nerve fibers that are more effective in producing mechanical hyperalgesia than are the known thermo- and mechanosensitive nociceptive nerve fibers. 6. Once developed, the mechanical hyperalgesia became only partially dependent on peripheral neural activity originating at the site of injury.</abstract><cop>Bethesda, MD</cop><pub>Am Phys Soc</pub><pmid>1919666</pmid><doi>10.1152/jn.1991.66.1.190</doi><tpages>22</tpages></addata></record>
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subjects Adult
Aged
Anesthesia, Local
Biological and medical sciences
Capsaicin
Central Nervous System - cytology
Central Nervous System - physiology
Female
Fundamental and applied biological sciences. Psychology
Humans
Hyperalgesia - chemically induced
Hyperalgesia - etiology
Hyperalgesia - physiopathology
Lymph - physiology
Male
Middle Aged
Nerve Fibers - physiology
Nervous System Physiological Phenomena
Neurons - physiology
Pain - chemically induced
Peripheral Nerves - cytology
Peripheral Nerves - physiology
Physical Stimulation - methods
Psychophysics
Regional Blood Flow
Skin - blood supply
Skin - drug effects
Somesthesis and somesthetic pathways (proprioception, exteroception, nociception)
interoception
electrolocation. Sensory receptors
Vertebrates: nervous system and sense organs
title Neurogenic hyperalgesia: psychophysical studies of underlying mechanisms
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