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Ultrasound and neurostimulation-guided plexus block in a dog undergoing radius osteosynthesis

Publication Date
Oct 06, 2013


A mongrel male dog of 4-year-old and 17 Kg with fracture of the left radius underwent plate fixation surgery. The pre-anesthesia was performed with acepromazine (0.01 mg / kg) intravenously, tramadol (3 mg / kg) and meloxicam (0.3 mg / kg) intramuscularly. Anaesthesia was induced with propofol (5 mg / kg) and maintained with isoflurane. Brachial plexus block was performed using an ultrasound-guided axillary approach (microconvex transducer of 7.5 MHz) and electrolocation. Using a multiple injection technique a volume 0.6 ml / kg of a mixture of 2% lidocaine and 0.5% bupivacaine (% v/v 30/70) was administered. The blood pressure, heart and respiratory rates were monitored by noninvasive procedures. An increase in the 20% of any of these parameters indicated the need for additional analgesia. Pulse oximetry and ECG tracing were also monitored. Postoperative analgesia consisted in a continues analgesic infusion (CRI) of a mixture of fentanyl (0.4 mg), ketamine (100 mg) and lidocaine (250 mg) in 500 ml of saline, infused at a rate of 3 ml/kg/h during 24 hours. Postoperative pain was evaluated at 60 minutes intervals for 24 hours after extubation by applying the Glasgow score, values higher than 5 were considered as indicative of insufficient analgesic coverage.

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