Efeito analgésico da metadona e morfina intramuscular ou epidural, associadas ou não à lidocaína, em cadelas submetidas à mastectomia

• Ano de defesa: 2013
• Autor(a) principal: Pereira, Vanessa Guedes
• Orientador(a): Favarato, Lukiya Silva Campos
• Banca de defesa: Cunha, Daise Nunes Queiroz da , Campagnol, Daniela
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Medicina Veterinária
• Departamento: Biotecnologia, diagnóstico e controle de doenças; Epidemiologia e controle de qualidade de prod. de
• País: BR
• Palavras-chave em Português: Avaliação da dor; Metadona; Epidural
• Palavras-chave em Inglês: Pain evaluation; Methadone; Epidural
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA::CLINICA E CIRURGIA ANIMAL::ANESTESIOLOGIA ANIMAL
• Link de acesso: http://locus.ufv.br/handle/123456789/5134

This study aimed to evaluate and compare the analgesic effect of opioids morphine and methadone by intramuscular and epidural, with or without the association of lidocaine, seeking to identify if the route of administration as well as the addition of epidural local anesthetic, can interfere with analgesia and sedation without postoperative cardiovascular and respiratory changes. Thirty female dogs with indication for unilateral radical mastectomy were anesthetized with isoflurane and propofol. The animals were randomly assigned to six treatment: methadone (0.5 mg.kg-1) or morphine (0.5 mg.kg-1) intramuscular (MET-IM and MORF-IM, respectively), methadone (0.3 mg.kg-1) or morphine (0,1 mg.kg-1) epidural (MET-EP and MORF-EP, respectively), methadone (0.3 mg.kg-1) or morphine (0.1 mg.kg-1) combined with lidocaine epidural (METL and MORFL, respectively), The volumes administered epidural and intramuscular were adjusted to 0.2 mL.kg-1 with the use of 0.9% NaCl solution or lidocaine, when this group was present. Equal volume of saline was administered in the opposite route of administration of drugs for blinded evaluation of treatments used. We evaluated the cardiovascular and respiratory parameters during the pre-and intraoperative. The evaluation of pain and post-operative sedation was performed for 24 hours. The supplemental analgesia was administered whenever the pain score was equal or higher 13 points (total 27 points) according to the University of Melbourne Scale of Pain (UMPS). The group MET-IM had lower mean FC in M6, as well as the group METL had lower SBP in M3, M4 and M5. The group MORF-EP showed higher sedation score in MP4. The MORF-IM group had higher pain scores in MP0, MP1, MP2, MP12 and MP24 and the group MORF-IM and METL in MP4 and MET-EP in MP6 and MP8. Methadone promoted greater cardiovascular depression than morphine however, neither of treatments tested has altered respiratory function. Both groups of the morphine and methadone produced postoperative sedation of mild to moderate. Morphine intramuscular results in inadequate postoperative analgesia compared to epidural administration with or without lidocaine, and also when compared with methadone intramuscular and epidural. Methadone epidural no produced better analgesia when compared to intramuscular administration. The epidural morphine, with or without lidocaine and the methadone combined with lidocaine produced effective analgesia without the need for supplemental analgesia for 24 hours.