Functional MRI-based identification of brain regions activated by mechanical noxious stimulation and modulatory effect of remifentanil in cats
| Autor: | Masatoshi Kamata, Naoki Fujita, Dai Nagakubo, Tomoya Iizuka, Ryohei Nishimura, Takayuki Nakagawa, Daisuke Hasegawa, Kanako Muta, Yuji Hamamoto |
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| Rok vydání: | 2016 |
| Předmět: |
Cingulate cortex
Male 040301 veterinary sciences Remifentanil Hippocampus Pain Stimulation Somatosensory system 0403 veterinary science 03 medical and health sciences Random Allocation 0302 clinical medicine Gyrus Piperidines medicine Noxious stimulus Animals General Veterinary medicine.diagnostic_test Dose-Response Relationship Drug business.industry Brain 04 agricultural and veterinary sciences Magnetic Resonance Imaging Analgesics Opioid medicine.anatomical_structure nervous system Anesthesia Cats Female Functional magnetic resonance imaging business psychological phenomena and processes 030217 neurology & neurosurgery medicine.drug |
| Zdroj: | Research in veterinary science. 114 |
| ISSN: | 1532-2661 |
| Popis: | This study was conducted to identify the brain regions corresponding to mechanical noxious stimulation in cats using functional magnetic resonance imaging (fMRI) and to investigate the modulatory effect of remifentanil on the activation of these regions. Six healthy cats were anesthetized using a constant-rate infusion of alfaxalone. Cats were allocated to one of three treatment groups: remifentanil 0 (saline), 0.25, and 0.5μg/kg/min. A 3.0-T MRI unit was used to collect fMRI data. During the fMRI scanning, mechanical noxious stimulation was applied by tail clamping. The brain regions activated by the stimulation were identified based on blood oxygenation level-dependent (BOLD) responses. The modulatory effects of remifentanil were evaluated using a region of interest (ROI) analysis comparing signal changes in each brain region. Increased activity from noxious stimulation was observed in the somatosensory area (the postcruciatus gyrus, the anterior part of the marginalis gyrus, and the anterior part of the ectomarginalis gyrus), the parietal association area (the middle part of the marginalis gyrus and the middle part of the ectomarginalis gyrus), the cingulate cortex, the hippocampus, and the cerebellum. The results of the ROI analysis indicated that activations in the somatosensory area, the cingulate cortex, the hippocampus, and the cerebellum were significantly modulated (P0.05) by remifentanil. In cats, activation patterns evoked by mechanical noxious stimulation were observed in several brain regions thought to be involved in various aspects of pain processing, including sensory discrimination and integration, affect, and motor response. These brain responses were modulated by remifentanil. |
| Databáze: | OpenAIRE |
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