Infusão contínua de dipirona em cadelas: efeitos cardiorrespiratórios e analgésicos

Abstract

Dipyrone is an effective analgesic for the management of moderate or severe postoperative pain, can be used alone in mild pain or associated with other analgesics in any type of pain, generating several benefits to the patient. The present study aimed to evaluate cardiorespiratory parameters in the intraoperative period, and analgesia in the trans and postoperative period, in dogs receiving constant rate infusion (CRI) of dipyrone. For the study, 20 canine females were submitted to elective ovariohysterectomy procedure. The preanesthetic medication was composed by the association of acepromazine and morphine, followed by induction with propofol and maintenance with isoflurane. Afterwards, the animals were divided randomly into two groups: dipyrone (GD), who received dipyrone boluses (25 mg/kg) intravenous, followed by the CRI of the drug at the rate of 10 mg/kg/h, and control group (CG), whose animals received the bolus and IC of 0.9% NaCl solution, both groups at a rate of 5 mL/kg/h. Variables with normal distribution were evaluated by ANOVA followed by the Tukey test (p<0,05) and compared between groups by paired t-test. Non-parametric variables were analyzed by Friedman test followed by Dunn's test. Among the groups, this evaluation was performed by the Mann-Whitney test (p<0,05). Statistical differences were observed between time points in both groups regarding HR, f, SBP, MBP, DBP, PPT, glycaemia, segmented neutrophils and lymphocytes. Among these two groups, there were only differences in baseline MBP, number of eosinophils, segmented neutrophils and surgical times. However, most values remained within the physiological range considered for the species. The postoperative analgesia assessments were performed for a period of 24 hours, using Glasgow Composite Pain Scale and Range of the University of Melbourne, no differences were observed between groups. The use of the drug as an adjunct to anesthesia did not alter the cardiorespiratory parameters, Nor haematological examinations performed. Postoperative analgesia was similar between the groups.