Brazilian Journal of Anesthesiology
https://bjan-sba.org/article/doi/10.1016/j.bjane.2013.06.013
Brazilian Journal of Anesthesiology
Scientific Article

Ondansetron reducing pain on injection of etomidate: a controlled randomized study

Ondansetrona reduz a dor da injeção de etomidato: estudo randômico controlado

Omid Azimaraghi; Yasaman Aghajani; Maziar Molaghadimi; Malihe Khosravi; Kobra Eslami; Fatemeh Ghadimi; Ali Movafegh

http://dx.doi.org/10.1016/j.bjane.2013.06.013 Braz J Anesthesiol, vol.64, n3, p.169-172, 2014
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Abstract

Introduction: Etomidate causes pain when injected intravenously. In this study we sought to determine if pretreatment by ondansetron reduces the pain on injection of etomidate. Methods: In this randomized, double blinded, placebo-controlled clinical trial, 20 patients of both sexes aged between 18 and 50 years of American Society of Anesthesiologists (ASA) physical status class I or II, whom were candidates for various elective surgical procedures and need more than one intravenous access were enrolled in the study. On arrival to the operating room two 22 gauge cannulas were inserted into veins on the dorsum of both hands. Following the infusion of 100 mL normal saline into both intravenous lines, using an elastic band, venous drainage of hands was occluded at midarm. The patients were administered 8 mg (2 mL) of ondansetron into one hand and 2 mL of 0.9% saline into the other hand at the same time. The elastic band was removed after 1 min and 2 mg (1 mL) of etomidate was administered at the same rate simultaneously into intravenous lines. The patients were asked to give a score of pain based on a verbal analog scale (VAS) to each hand. Results: A total number of 20 patients were studied (male = 55%, female = 45%). The mean age of the participants was 37.5 ± 13.1 years old and the mean weight was 67.7 ± 7.3 kg. The mean VAS for injection pain of etomidate after pre-administration of intravenous ondansetron was 1.5 ± 1.2 which was lower compared to pre-administration of placebo (3.2 ± 2.8, p < 0.05). Conclusion: This study illustrates that pre-treatment with intravenous ondansetron significantly reduces the pain on injection of etomidate.

Keywords

Etomidate, Ondansetron, Pain

Resumo

Justificativa e objetivo: etomidato causa dor quando administrado por via intravenosa. Neste estudo buscamos determinar se o pré-tratamento com ondansetrona reduz a dor causada pela injeção de etomidato. Métodos: neste estudo clínico randômico, duplo-cego e controlado por placebo, 20 pacientes de ambos os sexos, entre 18 e 50 anos, estado físico ASA I ou II, candidatos a procedimentos cirúrgicos eletivos que exigiam mais de um acesso intravenoso, foram incluídos. Ao darem entrada na sala de cirurgia, duas cânulas de calibre 22 foram inseridas nas veias do dorso de ambas as mãos. Após a infusão de 100 mL de solução salina normal em ambas as linhas de acesso intravenoso, a drenagem venosa das mãos foi ocluída até o meio do braço com o uso de um torniquete elástico. Os pacientes receberam 8 mg (2 mL) de ondansetrona em uma das mãos e 2 mL de solução salina a 0,9% na outra mão ao mesmo tempo. O torniquete foi removido após um minuto e 2 mg (1 mL) de etomidato foram administrados na mesma proporção simultaneamente nas linhas intravenosas. Pediu-se aos pacientes que dessem pontos à dor em cada mão, com base em uma escala verbal analógica (EVA). Resultados: avaliamos 20 pacientes (homens = 55%, mulheres = 45%). A média de idade e de peso foi de 37,5 ± 13,1 anos e 67,7 ±7,3 kg. A média do escore EVA para dor causada pela injeção de etomidato após a pré-administração de ondansetron IV foi de 1,5 ± 1,2, que foi menor em comparação com a pré-administração de placebo (3,2 ± 2,8, p < 0,05). Conclusão: este estudo mostra que o pré-tratamento com ondansetrona IV reduz significativamente a dor causada pela injeção de etomidato.

Palavras-chave

Etomidato, Ondansetrona, Dor

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