Source:http://linkedlifedata.com/resource/pubmed/id/17346887
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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
1-2
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| pubmed:dateCreated |
2007-10-8
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| pubmed:abstractText |
Contact heat stimuli have been reported to excite mechano-thermal nociceptors and to evoke brain potentials (CHEPs) from the limbs. We investigated whether contact heat evokes reproducible CHEPs from the trigeminal territory and may prove a reliable diagnostic tool in facial neuropathic pain. We applied contact heat stimuli to the perioral and supraorbital regions; CHEPs were recorded from the vertex in 20 controls and 2 patients with facial neuropathic pains, and reflex responses from the orbicularis oculi and masticatory muscles in 5 controls. We studied the correlation between CHEP data and perceptive ratings, site of stimulation, and age. Finally, we compared CHEPs with laser evoked potentials (LEPs). Contact heat stimuli at 51 degrees C evoked vertex potentials consisting of an NP complex similar to that elicited by laser pulses, though with a latency some 100-ms longer. Perioral stimulation yielded higher pain intensity ratings, shorter latency and larger amplitude CHEPs than supraorbital stimulation. CHEP data correlated significantly with age. Contact heat stimuli at 53 degrees C evoked a blink-like response in the relaxed orbicularis oculi muscle and a silent period in the contracted masseter muscle. In patients with facial neuropathic pain the CHEP abnormalities paralleled those seen with LEPs. We were unable to achieve reproducible signals related to C-receptor stimulation by contact heat stimuli at 41 degrees C in the ten subjects in whom they were tested. Contact heat stimulation, as well as laser stimulation, easily yields large-amplitude brain potentials and nociceptive reflexes, both related to the Adelta input. However CHEPs are not suitable for C-fibres potentials recording.
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| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:citationSubset |
IM
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| pubmed:status |
MEDLINE
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| pubmed:month |
Nov
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| pubmed:issn |
1872-6623
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| pubmed:author | |
| pubmed:issnType |
Electronic
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| pubmed:volume |
132
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| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
102-7
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| pubmed:dateRevised |
2008-11-21
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| pubmed:meshHeading |
pubmed-meshheading:17346887-Adult,
pubmed-meshheading:17346887-Aged,
pubmed-meshheading:17346887-Aged, 80 and over,
pubmed-meshheading:17346887-Diagnostic Techniques, Neurological,
pubmed-meshheading:17346887-Evoked Potentials, Somatosensory,
pubmed-meshheading:17346887-Facial Pain,
pubmed-meshheading:17346887-Female,
pubmed-meshheading:17346887-Hot Temperature,
pubmed-meshheading:17346887-Humans,
pubmed-meshheading:17346887-Male,
pubmed-meshheading:17346887-Middle Aged,
pubmed-meshheading:17346887-Nerve Fibers,
pubmed-meshheading:17346887-Reaction Time,
pubmed-meshheading:17346887-Trigeminal Nerve
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| pubmed:year |
2007
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| pubmed:articleTitle |
Trigeminal small-fibre function assessed with contact heat evoked potentials in humans.
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| pubmed:affiliation |
Department of Neurological Sciences, La Sapienza University, Viale Università 30, 00185 Rome, Italy. andrea.truini@uniroma1.it
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| pubmed:publicationType |
Journal Article
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