Study finds palatine approach falls short for canine maxillary block

A new cadaveric study in the Journal of Small Animal Practice tested whether a palatine-foramen approach could serve as an alternative way to block the canine maxillary nerve. In 10 canine cadaver heads, researchers from the University of Cambridge compared the novel palatine technique with the standard infraorbital approach using dye/contrast injection, CT imaging, and dissection. The palatine approach produced a much shorter stained segment of the maxillary nerve and a far higher procedural failure rate: 80% versus 20% for the infraorbital technique. The authors concluded that the palatine approach can't be recommended as a suitable alternative. (api.repository.cam.ac.uk)

Why it matters: For veterinary teams using regional anesthesia in oral, maxillofacial, rhinoscopy, or upper-airway procedures, this is a practical negative study. It suggests that a landmark that appears anatomically closer to the main maxillary trunk doesn't necessarily translate into a more reliable block. The findings also reinforce the current place of the infraorbital approach, which the authors note is the most extensively researched technique in dogs, while newer alternatives, including ultrasound-guided approaches, are still being refined. (api.repository.cam.ac.uk)

What to watch: Expect follow-up work on image-guided or otherwise modified maxillary block techniques, rather than rapid uptake of the palatine approach in clinical practice. (api.repository.cam.ac.uk)