| Evaluation of pseudo-affective responses to noxious colorectal distension in rats by manometric recordings. | |
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MedLine Citation:
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PMID: 15936885 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Recordings of electromyographic (EMG) activity in the abdominal musculature are generally used to quantify the pseudo-affective visceromotor response induced by colorectal distension (CRD) in rodents. The present study describes a non-invasive, manometric method to quantify the magnitude of the abdominal contractions evoked by CRD. CRD-induced increases in EMG activity in female rats (electrical response) were compared to phasic changes in balloon pressure (mechanical response). A phasic increasing CRD paradigm from 10 to 80mmHg with 10mmHg intervals induced a clear stimulus-response relationship with a strong correlation (r(2)=0.93) between the electrical and mechanical responses. Twelve repeated phasic distensions at 80mmHg increased the mechanical response by 133+/-53% (P<0.01), while the electrical response only increased by 20+/-19% (P>0.05), when comparing the last distension to the first. Atropine methyl bromide (1mg/kg, i.v.) did not affect the mechanical response to distension at 80mmHg, suggesting that colonic activity per se, does not contribute to the balloon pressure variations during CRD in the current experimental set-up. The mu-opioid receptor agonist fentanyl at a dose of 1.5microg/kg (i.v.) significantly reduced the mechanical response to CRD (P<0.01) while the electrical response was not affected. The present study shows that phasic bursts in EMG activity from the abdominal musculature occur simultaneously with balloon pressure variations, which may represent a non-invasive alternative to EMG recordings. Furthermore, the mechanical response is a more sensitive parameter for detecting both hyperalgesic and analgesic responses. |
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Authors:
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Anna Tammpere; Mikael Brusberg; Jan Axenborg; Ika Hirsch; Håkan Larsson; Erik Lindström |
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Publication Detail:
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Type: Comparative Study; Evaluation Studies; Journal Article |
Journal Detail:
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Title: Pain Volume: 116 ISSN: 0304-3959 ISO Abbreviation: Pain Publication Date: 2005 Aug |
Date Detail:
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Created Date: 2005-07-11 Completed Date: 2005-10-11 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7508686 Medline TA: Pain Country: Netherlands |
Other Details:
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Languages: eng Pagination: 220-6 Citation Subset: IM |
Affiliation:
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AstraZeneca R&D, Integrative Pharmacology, GI Biology, S-431 83 Mölndal, Sweden. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Animals Atropine Derivatives / pharmacology Colon / drug effects, physiology* Dilatation, Pathologic / drug therapy, physiopathology* Dose-Response Relationship, Drug Dose-Response Relationship, Radiation Electromyography / methods Female Fentanyl / pharmacology Muscle Contraction / drug effects, physiology Narcotics / pharmacology Nociceptors / drug effects, physiology* Pain Measurement / methods* Parasympatholytics / pharmacology Physical Stimulation / methods Pressure Rats Rats, Sprague-Dawley Sensory Thresholds / drug effects, physiology, radiation effects |
| Chemical | |
Reg. No./Substance:
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0/Atropine Derivatives; 0/Narcotics; 0/Parasympatholytics; 31610-87-4/methylatropine; 437-38-7/Fentanyl |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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