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1.
Article in English | MEDLINE | ID: mdl-26160698

ABSTRACT

INTRODUCTION: Neuropathic pain (NP) is a chronic pain modality that usually results of damage in the somatosensory system. NP often shows insufficient response to classic analgesics and remains a challenge to medical treatment. The transcranial direct current stimulation (tDCS) is a non-invasive technique, which induces neuroplastic changes in central nervous system of animals and humans. The brain derived neurotrophic factor plays an important role in synaptic plasticity process. Behavior changes such as decreased locomotor and exploratory activities and anxiety disorders are common comorbidities associated with NP. OBJECTIVE: Evaluate the effect of tDCS treatment on locomotor and exploratory activities, and anxiety-like behavior, and peripheral and central BDNF levels in rats submitted to neuropathic pain model. METHODS: Rats were randomly divided: Ss, SsS, SsT, NP, NpS, and NpT. The neuropathic pain model was induced by partial sciatic nerve compression at 14 days after surgery; the tDCS treatment was initiated. The animals of treated groups were subjected to a 20 minute session of tDCS, for eight days. The Open Field and Elevated Pluz Maze tests were applied 24 h (phase I) and 7 days (phase II) after the end of tDCS treatment. The serum, spinal cord, brainstem and cerebral cortex BDNF levels were determined 48 h (phase I) and 8 days (phase II) after tDCS treatment by ELISA. RESULTS: The chronic constriction injury (CCI) induces decrease in locomotor and exploratory activities, increases in the behavior-like anxiety, and increases in the brainstem BDNF levels, the last, in phase II (one-way ANOVA/SNK, P<0.05 for all). The tDCS treatment already reverted all these effects induced by CCI (one-way ANOVA/SNK, P<0.05 for all). Furthermore, the tDCS treatment decreased serum and cerebral cortex BDNF levels and it increased these levels in the spinal cord in phase II (one-way ANOVA/SNK, P<0.05). CONCLUSION: tDCS reverts behavioral alterations associated to neuropathic pain, indicating possible analgesic and anxiolytic tDCS effects. tDCS treatment induces changes in the BDNF levels in different regions of the central nervous system (CNS), and this effect can be attributed to different cellular signaling activations.


Subject(s)
Brain-Derived Neurotrophic Factor/metabolism , Brain/physiopathology , Motor Activity/physiology , Neuralgia/physiopathology , Neuralgia/therapy , Transcranial Direct Current Stimulation/methods , Animals , Anxiety/physiopathology , Anxiety/therapy , Disease Models, Animal , Enzyme-Linked Immunosorbent Assay , Exploratory Behavior/physiology , Male , Random Allocation , Rats, Wistar , Sciatic Nerve/injuries , Spinal Cord/physiopathology
2.
Rev. HCPA & Fac. Med. Univ. Fed. Rio Gd. do Sul ; 19(2): 205-7, ago. 1999. ilus, graf
Article in Portuguese | LILACS | ID: lil-285213

ABSTRACT

Este artigo apresenta a descrição de um microcautério otológico com dispositivos de aspiração e descolamento para utilização em cirurgia otológica. O microcautério foi desenvolvido no Hospital de Clínicas de Porto Alegre, pelos setores de Engenharia Biomédica e Otorrinolaringologia


Subject(s)
Humans , Otologic Surgical Procedures/instrumentation , Cautery/instrumentation , Cautery/methods
4.
Rev. bras. otorrinolaringol ; 64(6,pt.1): 571-6, nov.-dez. 1998. ilus, tab
Article in Portuguese | LILACS | ID: lil-232431

ABSTRACT

O trabalho avaliou cirurgias de ouvido médio em seres humanos, realizadas com microcautério com dispositivo de aspiraçäo e descolamento, concebido pelo primeiro autor, em comparaçäo com cirurgias do mesmo tipo, realizadas sem uso do dispositivo. Vinte e quatro pacientes com indicaçäo para estapedectomias e timpanoplastias unilaterais ou bilaterais foram selecionados. Foram excluídos pacientes com doenças sistêmicas como hipertensäo arterial sistêmica näo controlada e discrasias sanguíneas. Os pacientes foram divididos em dois grupos: 12 foram operados com o microcautério; 12, sem uso de cautério. O microcautério permite controle de tempo de exposiçäo e temperatura em baixas potências de saída (máximo de 35 W). A corrente elétrica concentrada pode explodir as células do tecido ou aquecer localmente o tecido. Isto permite a execuçäo de corte, cauterizaçäo e descolamento em regiöes de difícil acesso. As cirurgias foram gravadas em vídeo e avaliadas por dois cirurgiöes otológicos. A avaliaçäo foi cega: os cirurgiöes näo sabiam quais procedimentos haviam sido executados com o microcautério. Os procedimentos foram qualificados como ótimo, Bom, Regular ou Ruim. O parâmetro utilizado na avaliaçäo foi hemostasia. Os avaliadores qualificaram como ótimo o resultado global de todas as cirurgias realizadas com o microcautério. No grupo controle, o avaliador 1 qualificou 42 por cento das cirurgias como Ruim e 58 por cento como Regular. O avaliador 2 qualificou 25 por cento das cirurgias do grupo controle como Ruim e 75 por cento como Regular. O uso do microcautério demonstrou benefícios concretos, quando comparado com métodos convencionais. Portanto, consideramos aconselhável sua aplicaçäo neste tipo de cirurgia


Subject(s)
Humans , Cautery/instrumentation , Electrosurgery/instrumentation , Stapes Surgery , Tympanoplasty
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