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Tramadol plus metamizole combined or not with anti-inflammatory drugs is clinically effective for moderate to severe chronic pain treatment in cancer patients

  • Patrícia B Flôr
    Affiliations
    Departamento de Cirurgia, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, SP, Brazil
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  • Karina VB Yazbek
    Affiliations
    Departamento de Cirurgia, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, SP, Brazil
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  • Keila K Ida
    Correspondence
    Correspondence: Keila Ida, Faculdade de Medicina da Universidade de São Paulo, Laboratório de Investigação Médica LIM-08, Av. Doutor Arnaldo, 455, 2º andar - sala 2120, Cerqueira César, 01246-903, São Paulo, SP, Brazil
    Affiliations
    Laboratório de Investigação Médica LIM-08, Programa de Pós-Graduação em Anestesiologia, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brazil
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  • Denise T Fantoni
    Affiliations
    Laboratório de Investigação Médica LIM-08, Programa de Pós-Graduação em Anestesiologia, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brazil
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      Abstract

      Objective

      To test the effectiveness and safety of tramadol plus metamizole combined or not with a non-steroidal anti-inflammatory drug (NSAID) for treating moderate to severe chronic neoplastic pain in dogs, and its impact on quality of life (QL).

      Study design

      Prospective, uncontrolled, open-label, clinical study.

      Animals

      Sixty nine client-owned dogs with multiple forms of cancer and visual analog scale (VAS) pain score ≥40 after receiving NSAIDs for at least 7 days.

      Methods

      The MN group received metamizole + NSAID, MNT group received metamizole + NSAID + tramadol and MT group received metamizole + tramadol. Pain was scored by the 0 to 100 mm VAS (0 = no pain, 100 = worst pain) and analgesic therapy was considered effective if 25 mm differences in VAS scores were observed between day 0 and the follow ups. The QL was evaluated according to a 0 to 36 scoring method for dogs (0 = worst, 36 = best) and side effects were recorded. Data were registered at day 0 (baseline) and at the first and second follow ups (7 and 14 days after day 0, respectively).

      Results

      The MN group had less analgesia at day 7 (25%) and day 14 (42%) than MNT (59%, p = 0.0274; 76%, p = 0.0251, respectively) and MT groups (69%, p = 0.0151; 81%, p = 0.0341, respectively). The QL scores were lower in the MN group at the first (score 23) and second follow up (score 26) than in MNT (27, p = 0.0847; 30, p = 0.0002) and MT (28, p = 0.0384; 31, p = 0.0001) groups. Side effects were more commonly observed in the MN group (87%) than in MNT (24%, p < 0.0001) and MT groups (25%, p = 0.0003) at the first follow up.

      Conclusions and clinical relevance

      Tramadol plus metamizole combined or not with NSAID were well tolerated and clinically effective to treat moderate to severe pain in dogs with cancer and improved QL.

      Keywords

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