HEMODINAMIC EFFECTS OF CONTINUOUS RATE INFUSION OF BUTORPHANOL IN PROPOFOL-ANESTHETIZED DOGS

Abstract

The aim of this study was to evaluate the hemodynamic effects of the total intravenous anesthesiawith propofol and butorphanol in dogs. For that purpose, twenty adult healthy crossbred dogs wereused. The animals were equally allocated into two groups (PG and BG) and induced to the anesthesiawith intravenous propofol (10 mg/kg). After orotracheal intubation, controlled ventilation wasinstituted with 60% oxygen and flow of 30 mL/kg/min in a closed system, with controlled volume.The anesthetic maintenance was accomplished with propofol (0.6 mg/kg/min). The butorphanol group(BG) received, butorphanol 0.1 mg/kg IV, followed by continuous infusion (40 ?g/kg/h). The placebogroup (PG) received only NaCl 0.9% in bolus, followed by venous infusion, in identical volume of the BG. Baseline hemodynamic measurements were performed before opioid or saline administration(M0) and immediately after, every 15 minutes (M15 to M75). Administration of butorphanol resultedin decrease of total peripheric resistance (TPR), arterial pressures (SAP, DAP, MAP) and cardiacoutput (CO), without clinical relevance. The results allow us to conclude that association providessafe anesthesia for patients with ventilatory support.

Keywords: monitoring; opioid; total intravenous anesthesia.