Which block is characterized by multiple SQ infusion sites in an upside down L behind the 13th line?

• A. Caudal epidural block
• B. Inverted L block
• C. Line block
• D. Paravertebral block

Answer: (B)

The inverted L block is characterized by a series of subcutaneous (SQ) infusion sites arranged in an upside-down "L" shape, particularly positioned behind the 13th rib in veterinary practice. This block is primarily used for surgical procedures on the abdominal wall and helps in achieving effective analgesia.

In this technique, local anesthetic is deposited at multiple sites within the defined boundaries to create a larger area of anesthesia, effectively blocking the pain sensation from the abdominal wall. The formulation of this block allows for a more extensive coverage compared to single-point injections, making it particularly useful in cattle and other large animals during procedures requiring significant analgesia in the region.

The reference to the 13th line suggests a specific landmark for the administration of this block, which is crucial for its effectiveness. By utilizing a multi-site approach, the inverted L block enhances the quality of anesthesia while minimizing the risk of complications associated with deeper injections, as would be the case in blocks like the caudal epidural or paravertebral blocks.