The aim of this study was to determine the effects of the catheter-aided intrathecal slow injection of low-dose bupivacain for ovariohysterectomy in 20 non-pregnant dogs. A Tuohy cannula and a spinal catheter were used for infusion. The distance between the lumbosacral-thoracolumbar spaces, was measured under sedation 24 h prior to the operation. The catheter inserted into the subarachnoid region through the lumbosacral space, was advanced into the thoracolumbar space and fixed to the region. One day later, 0.5% bupivacaine was administered via the catheter into the thoracolumbar region at a dose of 1 ml/10 kg and rate of 1 ml/min; afterwards, ovariohysterectomy was performed. Blood pressure, heart rate, respiratory rate, and rectal temperature were recorded prior to anaesthesia, and 10, 20, 30, 45 and 60 min following anaesthesia. Anaesthesia was seen to last for 1.5-3 h. No adverse effects with regard to systolic and diastolic blood pressure, heart and respiratory rates during anaesthesia were observed. With this method, a reliable, fast-acting and desirable anaesthesia was achieved. In conclusion, in cases where general anaesthesia might be dangerous, spinal anaesthesia with a catheter could provide a risk-free option.
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