Brazilian Journal of Anesthesiology
https://bjan-sba.org/article/doi/10.1590/S0034-70942010000100001
Brazilian Journal of Anesthesiology
Scientific Article

Eficácia analgésica do uso de dose alta de morfina intra-articular em pacientes submetidos à artroplastia total de joelho

Analgesic efficacy of the intra-articular administration of high Doses of morphine in patients undergoing total knee arthroplasty

João Batista Santos Garcia Garcia; José Osvaldo Barbosa Neto; José Wanderley Vasconcelos; Letácio Santos Garcia Ferro; Rafaelle Carvalho e Silva

http://dx.doi.org/10.1590/S0034-70942010000100001 Braz J Anesthesiol, vol.60, n1, p.1-12, 2010
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Resumo

JUSTIFICATIVA E OBJETIVOS: Apesar da eficácia da morfina intraarticular (IA) permanecer controversa, tem-se mostrado que doses maiores promovem melhores resultados e, consequentemente, menor consumo pós-operatório de analgésico, caracterizando, assim, efeito dose-dependente na ação periférica. Foi conduzido estudo controlado, aleatório e duplamente encoberto para avaliar a eficácia de 10 mg de morfina por via intra-articular em pacientes submetidos à artroplastia total de joelho. MÉTODO: Foram avaliados 50 pacientes submetidos à artroplastia total de joelho, distribuídos aleatoriamente em dois grupos: o grupotratamento recebeu 10 mg (1 mL) de morfina por via intra-articular diluído em 19 mL de solução fisiológica a 0,9% (SF), enquanto o grupo-controle recebeu injeção intra-articular contendo 20 mL de SF, ambos após o fechamento da cápsula articular, ao final da operação. Morfina subcutânea sob demanda esteve disponível para dor residual. As seguintes variáveis foram avaliadas: intensidade da dor graduada na Escala Numérica (EN) às 2 h (M1), 6 h (M2), 12 h (M3) e 24 h (M4) após injeção IA; tempo para primeira solicitação de analgésico; consumo de analgésicos e efeitos adversos. CONCLUSÕES: O grupo-tratamento apresentou menores valores na EN que o grupo-controle em M1 e M2, enquanto que nos outros momentos não houve diferença significativa. O intervalo para primeira solicitação de analgésicos foi significativamente maior no grupo tratamento e o consumo de analgésicos nas primeiras 24 horas foi menor neste grupo. Não houve diferença entre incidência de efeitos adversos entre os grupos. Concluiu-se que 10 mg de morfina reduziram dor pós-operatória 2 e 6 horas após injeção IA, promoveram maior período sem analgésico de resgate e reduziram seu consumo nas primeiras 24 horas.

Palavras-chave

ANALGESIA, Pós-operatória, ANALGÉSICOS, Opioide, CIRURGIA, Ortopédica

Abstract

BACKGROUND AND OBJECTIVES: Although the efficacy of intraarticular (IA) morphine is still controversial, it has been shown that higher doses promote better results and consequently decrease postoperative analgesic consumption, characterizing a dose-dependent peripheral action. A controlled, randomized, double-blind study was undertaken to evaluate the efficacy of the intra-articular administration of 10 mg of morphine in patients undergoing total knee arthroplasty. METHODS: Fifty patients undergoing total knee arthroplasty were randomly divided into two groups: the treatment group received 10 mg (1 mL) of intra-articular morphine diluted in 19 mL of NS, while the control group received the intra-articular administration of 20 mL of NS, both after closure of the capsule at the end of the surgery. On demand subcutaneous morphine was available for residual pain. The following parameters were evaluated: pain severity according to the numeric scale (NS), 2 h (M1), 6 h (M2), 12 h (M3), and 24 h (M4) after the IA injection; time until the first request of analgesic; analgesic consumption, and side effects. CONCLUSIONS: The treatment group had lower NS than the control group in M1 and M2, while significant differences were not observed in the other moments. The time until the first request of analgesics was significantly higher in the treatment group, and analgesic consumption in the first 24 hours was also lower in this group. The incidence of side effects did not differ between both groups. We concluded that the postoperative IA administration of 10 mg of morphine promoted a longer period without rescue analgesics and reduced their consumption in the first 24 hours.

Keywords

ANALGESIA, Postoperative, ANALGESICS, Opioids, SURGERY, Orthopedic

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