Study finds IV lidocaine ineffective for euthanasia in Asian box turtles

A new study in the American Journal of Veterinary Research found that intravenous lidocaine delivered through the dorsal occipital sinus did not provide reliable euthanasia in sedated Asian box turtles (Cuora spp), while pentobarbital did. In the blinded, randomized study, turtles designated for euthanasia were first sedated with alfaxalone, then given either lidocaine at 20 mg/kg or pentobarbital at 200 mg/kg through the dorsal occipital sinus. The finding adds species-specific evidence to a thin reptile euthanasia literature and reinforces pentobarbital’s role as the more dependable injectable agent in chelonians, even when the occipital sinus is used for vascular access. (experts.illinois.edu)

Why it matters: For veterinary professionals, the study is a practical reminder that methods extrapolated from mammals or other reptile species may not translate cleanly to turtles. AVMA’s 2020 euthanasia guidance already treats reptiles as a special case because of prolonged cardiopulmonary persistence and the need for species-appropriate technique, deep anesthesia, and often a secondary method to confirm death. In that context, evidence that IV lidocaine via the dorsal occipital sinus was ineffective in Cuora spp could help clinicians avoid an unreliable protocol and stick with better-supported approaches when managing end-of-life care for chelonians. (olaw.nih.gov)

What to watch: Watch for the full paper’s detailed timing and failure data, plus whether it prompts follow-up work on alternative routes, doses, or adjunctive methods for reptile euthanasia. (experts.illinois.edu)