The Requirement Of Propofol Supplimentation During Maintenance Of Anesthesia For Dogs Undergoing Magnetic Resonance Imaging

This study evaluated the need of various additional doses of propofol during maintenance of anaesthesia of dogs subjected to magnetic resonance imagistic diagnosis (MRI). Our study was conducted at the Faculty of Veterinary Medicine in Bucharest throughout 2018, on a number of 60 dogs. Animals were divided in three different groups. Patients from group B (n=20) were premedicated with 0.2 mg/kg butorphanol intramuscularly (IM), group BK (n=20) received 0.2 mg/kg butorphanol and 2.5 mg/kg ketamine IM while dogs in group BD were given 0.2 mg/kg butorphanol and 0.2 mg/kg diazepam IM. All patients were induced with propofol intravenously (IV) at a dose of 2-4 mg/kg, intubated and maintained with 1.5 % Isoflurane and oxygen. We considered necessary the administration of an additional dose of propofol when the anaesthetic plan was superficial or when respiratory movements became a problem for the MRI scan. The mean additional dose of propofol for group BD was 2.3 mg/kg and 2 mg/kg for group BK respectively, while patients premedicated with butorphanol required a higher mean additional dose of propofol of 3.2 mg/kg. The incidence of dogs from group B requiring at least one additional dose was 100%, compared with 70% for the BD group and 65% for the BK group.