Analgesic comparison of systemic lidocaine, morphine or lidocaine plus morphine infusion in dogs undergoing fracture repair

• Published in: Acta cirurgica brasileira Vol. 29; no. 4; pp. 245 - 251
• Main Authors: Guimarães Alves, Isabela Picolo, Montoro Nicácio, Gabriel, Diniz, Miriely Steim, Alves Rocha, Thalita Leone, Prada Kanashiro, Glaucia, Navarro Cassu, Renata
• Format: Journal Article
• Language: English
• Published: Brazil Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia 01.04.2014
• Subjects: Analgesia - methods; Analgesia - veterinary; Analgesics; Analgesics, Opioid; Analgesics, Opioid - administration & dosage; Anesthesia; Anesthetics, Combined - administration & dosage; Anesthetics, Local - administration & dosage; Animals; Dogs; Drug Combinations; Female; Fractures, Bone - surgery; Fractures, Bone - veterinary; Infusions, Intravenous; Lidocaine; Lidocaine - administration & dosage; Male; Morphine; Morphine - administration & dosage; Pain Measurement - veterinary; Pain, Postoperative - drug therapy; Pain, Postoperative - veterinary; Reproducibility of Results; Time Factors; Treatment Outcome
• ISSN: 0102-8650; 1678-2674; 0102-8650
• DOI: 10.1590/s0102-86502014000400005

To compare the postoperative analgesic effects of lidocaine, morphine and lidocaine plus morphine administered by constant rate infusion (CRI) and analyzing their effects on opioid requirements after orthopedic surgery in dogs. Twenty-four dogs underwent fracture repairs were premedicated with IM acepromazine (0.05 mg/kg) combined with morphine (0.3mg/kg). Anesthesia was induced with IV propofol (4 to 5 mg/ kg) and maintained with isoflurane. The dogs were randomly assigned to 3 groups and administered a CRI IV of lidocaine (T-L), morphine (T-M) or lidocaine plus morphine (T-LM) at the same doses. Postoperative analgesia was assessed for 24 hours using a Visual Analog Scale (VAS) and the Glasgow Composite Pain Scale (GCPS). Rescue analgesia was performed if the evaluation score exceeded 50% of the VAS and/or 33% of the GCPS. The pain score and postoperative opioid requirements did not differ among the treatments. Rescue analgesia was administered to 1/8 dogs in the T-M and T-LM, and to 3/8 dogs in the T-L. Lidocaine, morphine or lidocaine/morphine CRI may be efficacious techniques for pain management in the first 24 hours post-surgery. However, the two drugs administered together did not reduce the postoperative opioid requirement in dogs undergoing fracture repair. Key words: Anesthesia. Analgesics. Analgesics, Opioid. Lidocaine. Morphine. Dogs.