Brazilian Journal of Anesthesiology
https://bjan-sba.org/article/doi/10.1016/j.bjane.2015.09.005
Brazilian Journal of Anesthesiology
Scientific Article

Tourniquet-induced ischaemia-reperfusion injury: the comparison of antioxidative effects of small-dose propofol and ketamine

Lesão de isquemia-reperfusão induzida por torniquete: comparação dos efeitos antioxidantes de propofol e cetamina em doses baixas

Karaca Omer; Gogus Nermin; Ahiskalioglu Ali; Aksoy Mehmet; Dogus Unal; Kumas Solak Sezen; Kalafat Hakan

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Abstract

Abstract Objectives: The aim of the present study was to investigate the preventive effects of propofol and ketamine as small dose sedation during spinal anaesthesia on tourniquet-induced ischaemia-reperfusion injury. Methods: 30 patients were randomly assigned into two groups of 15 patients. In the propofol group, sedation was performed with propofol 0.2 mg·kg-1 followed by infusion at a rate of 2 mg·kg-1·h-1. In the ketamine group, a continuous infusion of ketamine 0.5 mg·kg-1·h-1 was used until the end of surgery. Intravenous administration of midazolam was not used in any patients. Ramsay sedation scale was used for assessing the sedation level. Venous blood samples were obtained before propofol and ketamine infusion (T1), at 30 minutes (min) of tourniquet ischaemia (T2), and 5 min after tourniquet deflation (T3) for malondialdehyde (MDA) measurements. Results: No differences were noted between the groups in haemodynamic (p > 0.05) and demographic data (p > 0.05). There was no statistically significant difference between the two groups in terms of T1, T2 and T3 periods (p > 0.05). There was a statistically increase observed in MDA values respectively both in Group P and Group K between the reperfusion period (1.95 ± 0.59, 2.31 ± 0.48) and pre-ischaemia (1.41 ± 0.38, 1.54 ± 0.45), and ischaemia (1.76 ± 0.70, 1.71 ± 0.38) (µmoL-1) periods (p < 0.05). Conclusions: Small-dose propofol and ketamine has similar potential to reduce the oxidative stress caused by tourniquet-induced ischaemia-reperfusion injury in patients undergoing arthroscopic knee surgery under spinal anaesthesia.

Keywords

Propofol, Ketamine, Arthroscopic knee surgery, Ischaemia reperfusion

Resumo

Resumo Objetivos: O objetivo do presente estudo foi investigar os efeitos preventivos de propofol e cetamina em sedação com doses baixas durante a raquianestesia sobre lesão de isquemia-reperfusão induzida por torniquete. Métodos: 30 pacientes foram randomicamente alocados em dois grupos de 15 pacientes cada. No grupo propofol, a sedação foi feita com 0,2 mg.kg-1 de propofol seguida por infusão a uma taxa de 2 mg.kg-1.h-1. No grupo cetamina, uma infusão contínua de 0,5 mg.kg-1.h-1 de cetamina foi usada até o final da cirurgia. Midazolam intravenoso não foi administrado em nenhum dos pacientes. A Escala de Sedação de Ramsay (ESR) foi usada para avaliar o nível de sedação. Amostras de sangue venoso foram colhidas antes da administração de propofol e infusão de cetamina (T1), aos 30 minutos (min) de isquemia do torniquete (T2) e 5 min após a desinsuflação do torniquete (T3), para medir os valores de malondialdeído (MDA). Resultados: Não observamos diferenças entre os grupos em relação à hemodinâmica (p > 0,05) e dados demográficos (p > 0,05). Não houve diferença estatisticamente significativa entre os dois grupos nos períodos T1, T2 e T3 (p > 0,05). Um aumento estatisticamente significativo foi observado nos valores de MDA, respectivamente, no Grupo P e Grupo C entre os períodos de reperfusão (1,95 ± 0,59, 2,31 ± 0,48) e pré-isquemia (1,41 ± 0,38, 1,54 ± 0,45) e isquemia (1,76 ± 0,70, 1,71 ± 0,38) (µmoL-1) (p < 0,05). Conclusões: Propofol e cetamina em doses baixas apresentam potencial semelhante para reduzir o estresse oxidativo causado pela lesão de isquemia-reperfusão induzida por torniquete em pacientes submetidos à artroscopia de joelho sob raquianestesia.

Palavras-chave

Propofol, Cetamina, Artroscopia do joelho, Isquemia-reperfusão

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