Which type of local anesthesia is NOT commonly used in large animals?

• A. Flank anesthesia
• B. Intravenous regional anesthesia
• C. Inverted L block
• D. Sacral block

Answer: (B)

Intravenous regional anesthesia is not commonly used in large animals primarily due to the anatomy and physiology differences between large animals and smaller species. This technique, also known as the Bier block, is more effective and practical in smaller animals where the limbs can easily be isolated and bandaged, allowing a tourniquet to be placed to maintain the localized effect of the anesthetic.

In large animals, the size and vascularity of their limbs can make it challenging to effectively apply this technique. Additionally, the potential for complications such as systemic absorption of the anesthetic in larger animals is a significant concern. Other regional anesthesia techniques, such as flank anesthesia, inverted L block, and sacral block, are more suitable and frequently employed in large animal practice, tailored to specific surgical needs and anatomical considerations.