Comparison Between Lignocaine Hydrochloride and Ropivacaine Hydrochloride as Lumbosacral Epidural Anaesthetic Agents in Goats Undergoing Laparoscopy Assisted Embryo Transfer

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Goats (n=12) undergoing laparoscopy assisted embryo transfer were randomly allotted to two groups (I and II) and injected lignocaine hydrochloride (4mg/kg) or ropivacaine hydrochloride (1mg/kg) at the lumbosacral epidural space. The animals were held with raised hind quarters for the first three minutes following injection. Immediately after induction of regional anaesthesia, they were restrained in dorsal recumbency in the Trendelenburg position in a cradle. Laparoscopy was performed after creating pneumoperitoneum using filtered room air. The mean (± S.E) induction time in animals of group I was significantly shorter (5.33 ± 0.61 min) than those belonging to group II (12.66 ±1.99 min). Complete analgesia developed throughout the hind quarters and abdomen for 30 min and 60 min in group I and II animal’s respectively. Unlike animals of group I, group II goats continued to show moderate analgesia for 180 minutes. The motor activity returned after a lapse of 130.00 ± 12.64 min and 405.00 ± 46.31 min respectively. Occasional vocalization and struggling was noticed in two goats one from each group irrespective of the surgical manipulations during laparoscopy. The rectal temperature and respiration rates showed only non-significant increase, but the heart rate values were significantly higher (P < 0.5) up to 150 min in animals of both the groups when compared to their baseline values. From this study, it was concluded that both anaesthetic agents produced satisfactory regional anaesthesia in goats undergoing laparoscopy. However, considering the very long delay in regaining the hind limb motor activity, the use of ropivacaine may not be recommended for this purpose. Supplementation of sedative/tranquilizer with lumbosacral epidural anaesthesia needs evaluation.

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