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Ipsilateral and contralateral sensory changes in healthy subjects after experimentally induced concomitant sensitization and hypoesthesia.
- Source :
- BMC Neurology; 3/23/2017, Vol. 17, p1-11, 11p, 1 Diagram, 1 Chart, 3 Graphs
- Publication Year :
- 2017
-
Abstract
- <bold>Background: </bold>In unilateral neuropathic pain. e.g. after peripheral nerve injury, both positive and negative sensory signs occur often, accompanied by minor but equally directed contralateral sensory changes. To mimic this feature, we experimentally aimed to induce concomitant c-fibre sensitization and block in healthy subjects and analyzed the bilateral sensory changes by quantitative sensory testing (QST) using the protocol of the German Research Network on Neuropathic Pain.<bold>Methods: </bold>Twenty eight healthy subjects were firstly randomized in 2 groups to receive either topical capsaicin (0.6%, 12 cm2, application duration: 15 min.) or a lidocaine/prilocaine patch (25/25 mg, 10 cm2, application duration: 60 min.) on the right volar forearm. Secondly, 7-14 days later in the same area either at first capsaicin (for 15 min.) and immediately afterwards local anesthetics (for 60 min.) was applied (Cap/LA), or in inversed order with the same application duration (LA/Cap). Before, after each application and 7-14 days later a QST was performed bilaterally.<bold>Statistics: </bold>Wilcoxon-test, ANOVA, pā<ā0.05.<bold>Results: </bold>Single application of 0,6% capsaicin induced thermal hypoesthesia, cold hypoalgesia, heat hyperalgesia and tactile allodynia. Lidocaine/prilocaine alone induced thermal and tactile hypoesthesia as well as mechanical and cold hypoalgesia, and a heat hyperalgesia (to a smaller extent). Ipsilaterally both co-applications induced a combination of the above mentioned changes. Significant contralateral sensory changes occurred only after the co-application with concomitant sensitization and hypoesthesia and comprised increased cold (Cap/LA, LA/Cap) and mechanical detection as well as cold pain threshold (LA/Cap).<bold>Conclusion: </bold>The present experimental model using combined application of capsaicin and LA imitates partly the complex sensory changes observed in patients with unilateral neuropathic pain and might be used as an additional surrogate model. Only the concomitant use both agents in the same area induces both positive and negative sensory signs ipsilaterally as well as parallel contralateral sensory changes (to a lesser extent).<bold>Trial Registration: </bold>ClinicalTrials.gov Identifier NCT01540877 , registered on 23 February 2012. [ABSTRACT FROM AUTHOR]
- Subjects :
- SENSITIZATION (Neuropsychology)
NEUROPATHY
LOCAL anesthetics
CAPSAICIN
HYPERALGESIA
PATIENTS
NUMBNESS
DRUG dosage
BIOLOGICAL models
COMPARATIVE studies
DRUGS
LIDOCAINE
RESEARCH methodology
MEDICAL cooperation
NEURALGIA
RESEARCH
SENSE organs
TACTILE agnosia
EVALUATION research
RANDOMIZED controlled trials
HUMAN research subjects
SOMATOSENSORY disorders
PHARMACODYNAMICS
Subjects
Details
- Language :
- English
- ISSN :
- 14712377
- Volume :
- 17
- Database :
- Complementary Index
- Journal :
- BMC Neurology
- Publication Type :
- Academic Journal
- Accession number :
- 122026611
- Full Text :
- https://doi.org/10.1186/s12883-017-0839-9