P820: Withdrawal reaction in response to a single nociceptive stimulus in myelopathy

2014 ◽  
Vol 125 ◽  
pp. S262
Author(s):  
S. Yaguee ◽  
M. Veciana ◽  
J. Pedro ◽  
C. Casasnovas ◽  
A. Pujol ◽  
...  
Keyword(s):  
Withdrawal Reaction ◽  
Nociceptive Stimulus

scholarly journals Observation of Nociceptive Processing: Effect of Intra-Epidermal Electric Stimulus Properties on Detection Probability and Evoked Potentials

2021 ◽  
Vol 34 (2) ◽  
pp. 139-153
Author(s):  
Boudewijn van den Berg ◽  
Jan R. Buitenweg
Keyword(s):  
Evoked Potentials ◽  
Detection Probability ◽  
Pulse Interval ◽  
System Behavior ◽  
Stimulus Properties ◽  
Nociceptive System ◽  
Nociceptive Stimulus ◽  
Peripheral Nerve Fiber ◽  
Nociceptive Processing ◽  
Mixed Regression

AbstractMonitoring nociceptive processing is a current challenge due to a lack of objective measures. Recently, we developed a method for simultaneous tracking of psychophysical detection probability and brain evoked potentials in response to intra-epidermal stimulation. An exploratory investigation showed that we could quantify nociceptive system behavior by estimating the effect of stimulus properties on the evoked potential (EP). The goal in this work was to accurately measure nociceptive system behavior using this method in a large group of healthy subjects to identify the locations and latencies of EP components and the effect of single- and double-pulse stimuli with an inter-pulse interval of 10 or 40 ms on these EP components and detection probability. First, we observed the effect of filter settings and channel selection on the EP. Subsequently, we compared statistical models to assess correlation of EP and detection probability with stimulus properties, and quantified the effect of stimulus properties on both outcome measures through linear mixed regression. We observed lateral and central EP components in response to intra-epidermal stimulation. Detection probability and central EP components were positively correlated to the amplitude of each pulse, regardless of the inter-pulse interval, and negatively correlated to the trial number. Both central and lateral EP components also showed strong correlation with detection. These results show that both the observed EP and the detection probability reflect the various steps of processing of a nociceptive stimulus, including peripheral nerve fiber recruitment, central synaptic summation, and habituation to a repeated stimulus.

Comparison of pre-emptive butorphanol or metamizole with ketamine +medetomidine and s-ketamine + medetomidine anaesthesia in improving intraoperative analgesia in mice

2018 ◽  
Vol 53 (5) ◽  
pp. 459-469
Author(s):  
C Bauer ◽  
U Schillinger ◽  
J Brandl ◽  
A Meyer-Lindenberg ◽  
A Ott ◽  
...  
Keyword(s):  
Body Temperature ◽  
Pulse Oximetry ◽  
Respiratory Frequency ◽  
Painful Stimulus ◽  
Male Mice ◽  
Controlled Ventilation ◽  
Withdrawal Reaction ◽  
Potential Improvement ◽  
Frequency Pulse

In accordance with the ‘refinement’ component of the 3Rs, the primary aim of this study was to investigate and compare ketamine + medetomidine (KM) and s-ketamine + medetomidine (SKM) anaesthetic protocols in C57BL/6J mice (both sexes). We sought to determine whether s-ketamine could provide adequate surgical tolerance at a 50% dose relative to that of ketamine racemate and whether antagonism of medetomidine could be initiated 15 min earlier. The second aim was to investigate the potential improvement in analgesia for both anaesthetic protocols by adding butorphanol or metamizole. Analgesia was tested via the pedal withdrawal reaction (PWR) to a painful stimulus. During anaesthesia, respiratory frequency, pulse oximetry, body temperature and PWR were monitored. Among the 16 mice in each group, the PWR was lost in all the KM + metamizole (35:56 ± 6:07 min), KM + butorphanol (43:45 ± 2:14 min) and SKM + butorphanol (24:03 ± 5:50 min) mice, 15 of the non-premedicated KM (37:00 ± 8:11 min) mice, and 9 of the pure SKM (20:00 ± 4:19 min) mice; the latter group increased to 11 mice (17:16 ± 5:10 min) with premedication of metamizole. In contrast to the racemic combination, s-ketamine at the dose used here did not lead to sufficient loss of the PWR. However, earlier partial antagonism of SKM resulted in a slightly shorter and qualitatively better recovery than later partial antagonism of SKM. The addition of metamizole or butorphanol to KM or SKM anaesthesia positively influences the analgesic quality. However, when butorphanol is added, controlled ventilation may be necessary, especially for male mice.

scholarly journals The effect of baclofen on spontaneous and evoked behavioural expression of experimental neuropathic chronic pain

1999 ◽  
Vol 57 (3B) ◽  
pp. 753-760 ◽  
Author(s):  
TEREZINHA DE JESUS T. SANTOS ◽  
CARLOS M. DE CASTRO-COSTA ◽  
SÍLVIO D. A. GIFFONI ◽  
FRANKLIN J. C. SANTOS ◽  
RODRIGO S. N. RAMOS ◽  
...  
Keyword(s):  
Chronic Pain ◽  
Nervous System ◽  
Neuropathic Pain ◽  
Aminobutyric Acid ◽  
Thermal Stimulus ◽  
Dependent Manner ◽  
Gamma Aminobutyric Acid ◽  
Analgesic Effects ◽  
Nociceptive Stimulus ◽  
Dose Dependent

Baclofen (beta-p-chlorophenyl-GABA) has been used in humans to treat spasticity, as well as trigeminal neuralgia. Since GABA (gamma-aminobutyric acid) has been implicated in inhibitory and analgesic effects in the nervous system, it was of interest to study the effect of baclofen in experimental neuropathic pain. With this purpose, experiments were carried out in 17 neuropathic rats with constrictive sciatic injury, as described by Bennet and Xie (1988), taking as pain parameters scratching behaviour and the latency to the thermal nociceptive stimulus. The results showed that baclofen induces, in a dose-dependent manner, significant decrease (p < 0.05) of scratching behaviour and significant increase (p < 0.05) of the latency to the nociceptive thermal stimulus. The absence of antagonism of naloxone suggested a non-participation of an opioid-mediated mechanism in this analgesic effect of baclofen on experimental neuropathic pain.

Colorectal distension: A visceral nociceptive stimulus that decreases CGRP content throughout the spinal cord of the rat

1998 ◽  
Vol 114 ◽  
pp. A850
Author(s):  
K.R. Tyler ◽  
J. Ren ◽  
R. Harty ◽  
V. Plourde ◽  
B. Greenwood-Van Meerveld
Keyword(s):  
Spinal Cord ◽  
Colorectal Distension ◽  
Nociceptive Stimulus

Withdrawal Reaction after Long-Term Therapeutic Use of Benzodiazepines

1986 ◽  
Vol 315 (14) ◽  
pp. 854-859 ◽  
Author(s):  
Usoa Busto ◽  
Edward M. Sellers ◽  
Claudio A. Naranjo ◽  
Howard Cappell ◽  
Martha Sanchez-Craig ◽  
...  
Keyword(s):  
Therapeutic Use ◽  
Withdrawal Reaction

scholarly journals NSAID Antinociception Measured in a Chemical and a Thermal Assay in Mice

2001 ◽  
Vol 6 (4) ◽  
pp. 190-196 ◽  
Author(s):  
HF Miranda ◽  
J Lopez ◽  
F Sierralta ◽  
A Correa ◽  
G Pinardi
Keyword(s):  
Dose Response ◽  
Intrathecal Administration ◽  
Test Subject ◽  
Tail Flick ◽  
Response Curves ◽  
Tail Flick Test ◽  
Chemical Test ◽  
Writhing Test ◽  
Nociceptive Stimulus ◽  
Dose Response Curves

The antinociceptive activity of several nonsteroidal anti-inflammatory drugs (NSAIDs) that were administered either intraperitoneally or intrathecally was assessed in mice by two algesiometric tests. The first was the writhing test, which assessed the abdominal constrictions that were induced by intraperitoneal acetic acid (a chemical test), and the second was the tail flick test, which measured pain responses to heat stimuli. The corresponding effective doses and their relative potencies were compared because these tests use different nociceptive stimuli with different transmission pathways. The intraperitoneal and intrathecal dose-response curves for the antinociception induced by every NSAID that was tested were parallel in the writhing test. In the tail flick test, however, only the intraperitoneal and intrathecal dose-response curves for ketoprofen, piroxicam, naproxen, nimesulide, paracetamol and diclofenac were parallel. The results obtained in this study confirm that NSAIDs possess different abilities to induce inhibition of cyclooxygenase, and they can be indirectly assessed by their different antinociceptive activities, depending on the algesiometric assays that are used. The antinociception of most NSAIDs might involve central mechanisms. The findings demonstrate the increasing importance of the spinal cord in processing and modulating nociceptive input, because intrathecal administration of NSAIDs is always more effective (in terms of potency) than systemic administration; thus, the antinociceptive efficacy of NSAIDs strongly depends on the algesiometric assay that is used and on the type of the nociceptive stimulus to which the test subject is exposed.

Urinary Monoamine Oxidase Inhibitor and Benzodiazepine Withdrawal

1982 ◽  
Vol 140 (1) ◽  
pp. 7-10 ◽  
Author(s):  
H. Petursson ◽  
S. K. Bhattacharya ◽  
Vivette Glover ◽  
M. Sandler ◽  
M. H. Lader
Keyword(s):  
Monoamine Oxidase ◽  
Monoamine Oxidase Inhibitor ◽  
Oxidase Inhibitor ◽  
Withdrawal Reaction ◽  
Excretion Pattern ◽  
Benzodiazepine Withdrawal

SummaryA characteristic withdrawal reaction following the cessation of long-term benzodiazepine treatment in seven patients was accompanied by a significant increase in output of urinary monoamine oxidase inhibitor. This finding provides further support for the concept that the urinary inhibitor excretion pattern may be related to stress or anxiety.

scholarly journals GABAA Receptor/STEP61 Signaling Pathway May Be Involved in Emulsified Isoflurane Anesthesia in Rats

2020 ◽  
Vol 21 (11) ◽  
pp. 4078 ◽  
Author(s):  
Xingkai Zhao ◽  
Guangjun Chang ◽  
Yan Cheng ◽  
Zhenlei Zhou
Keyword(s):  
Gamma Aminobutyric Acid ◽  
High Concentration ◽  
Messenger Ribonucleic Acid ◽  
Novel Approach ◽  
Nociceptive Stimulus ◽  
Mrna And Protein Expression ◽  
Ion Channel Proteins ◽  
Polymerase Chain ◽  
The Brain ◽  
Α1 Subunit

(1) Background: Emulsified isoflurane (EISO) is a type of intravenous anesthetic. How emulsified isoflurane works in the brain is still unclear. The aim of this study was to explore whether epigenetic mechanisms affect anesthesia and to evaluate the anesthetic effects of emulsified isoflurane in rats. (2) Methods: Rats were randomly divided into four groups (n = 8/group): The tail vein was injected with normal saline 0.1 mL·kg−1·min−1 for the control (Con) group, with intralipid for the fat emulsion (FE) group, with EISO at 60 mg·kg−1·min−1 for the high-concentration (HD) group, and 45 mg·kg−1·min−1 for the low-concentration (LD) group. The consciousness state, motor function of limbs, and response to nociceptive stimulus were observed after drug administration. (3) Results: Using real-time polymerase chain reaction (PCR) to assess the promoter methylation of ion channel proteins in the cerebral cortex of rats anesthetized by EISO, we demonstrated that the change in the promoters’ methylation of the coding genes for gamma-aminobutyric acid A receptor α1 subunit (GABAAα1), N-methyl-D-aspartate receptor subunit 1 (NMDAR1), and mu opioid receptor 1 (OPRM1) was accompanied by the change in messenger ribonucleic acid (mRNA) and protein expression by these genes. (4) Conclusion: These data suggest that the epigenetic factors’ modulation might offer a novel approach to explore the anesthetic mechanism of EISO.

scholarly journals A New Perspective of Acupuncture: The Interaction among Three Networks Leads to Neutralization

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Ning-cen Li ◽  
Ming-yue Li ◽  
Bo Chen ◽  
Yi Guo
Keyword(s):  
Immune System ◽  
The Body ◽  
Large Network ◽  
Disease Network ◽  
Nociceptive Stimulus ◽  
Acupuncture Effect ◽  
New Perspective ◽  
Cascade Amplification ◽  
Reaction Cascades

Acupuncture has been used to treat multiple medical conditions, but whether the diverse effects of acupuncture are intrinsically linked and how they might be connected have yet to be determined. More and more researches have shown that acupuncture is a kind of nociceptive stimulus, which can cause inflammatory reaction in the sites of acupuncture and then further activate the nerve-endocrine-immune systems to cause the cascade amplification of the acupuncture effect. This review seeks to provide a comprehensive summary of the existing literature concerning the role of “acupoint-meridian-disease network” in various effects of acupuncture and suggest a novel notion that acupuncture may restore homeostasis under different pathological conditions by regulating this network, resulting in the activation of different reaction cascades in response to pathological injury. We think that acupuncture acts on acupoints, first activating the small network of acupoints (Acupoint Network). The information of acupuncture is amplified by cascade, and the nerve endocrine immune system (NEI) is activated through the large network of meridians (Meridian Network) of the body itself. The nerve-endocrine-immune system (NEI) further outputs the effect information to the target organ through multilevel and multisystems and finally acts on the disease network (Disease Network) to produce acupuncture effect.

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