Comparison between the analgesic effect of the epidural morphine and tramadol in cats (Felis catus domesticus) / Comparação entre o efeito analgésico da morfina e do tramadol epidural em gatos (Felis catus domesticus).

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The purpose of this study was to compare the effectiveness and duration of the analgesic tramadol to the morphine, administered by the epidural route in cats (Felis catus domesticus) For this, six females cats were used, without defined breed, weighing between three and four kilograms and age ranging from one to three years. After fasting food, in 12 hours and water, four hours, the animals were subjected to general anesthesia with isoflurane through an anesthetic box, in order to allow the completion of the epidural technique. Each animal received at random, in a blind study, three epidural route treatments at intervals of one week between them, with: saline solution to 0.9% in a volume equivalent to 0.22ml.kg-1 (Control Group), tramadol 1 mg.kg-1 diluted in saline solution and volume equivalent to 0.22 ml.kg-1 (Tramadol Group) and morphine 0.1mg.kg-1 diluted in saline solution and volume equivalent to 0.22ml.kg-1 (Morphine Group). One hour after administration of each drug and general anesthesia recovery, the animals were subjected to painful stimuli in three pre-defined places: in the dorsal tail basis, the side of the right and left thigh, giving continuity, 2, 3, 4, 6, 8, 10 and 12 hours respectively. The pain was qualified by the implementation of two Simple Descriptive Scales (SDS), a Visual Analog Scale (VAS), measurement of heart and respiratory rate. For qualitative variables used in the Latin Square design 3 x 3 with the Kruskal-Wallis test and for the quantitative variables used in Analysis of Variance (ANOVA). There was no difference in relation to the time of anesthesia and respiratory frequency, However, the heart rate was significantly different (p<0.05) in hours two and four between control group and tramadol. In all scales used there were significant difference (p<0.05) in hours 8, 10 and 12. In these times the morphine produced more quality analgesia than the tramadol. Based on the results obtained, it can be concluded that the tramadol administered in epidural route resulted a satisfactory analgesia, without an adverse effects, but poorer than the morphine analgesia administered by the same route.

ASSUNTO(S)

tramadol morphine analgesia epidural cats epidural analgesia medicina veterinaria morfina gatos

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