Читать книгу Bovine Reproduction - Группа авторов - Страница 278

The inverted L block is a non‐specific regional block that locally blocks the tissue bordering the caudal aspect of the thirteenth rib and the ventral aspect of the transverse processes of the lumbar vertebrae [5]. An 18‐gauge, 3.8‐cm needle is used to inject up to a total of 100 ml of local anesthetic solution in multiple small injection sites into the tissues bordering the dorsocaudal aspect of the thirteenth rib and ventrolateral aspect of the transverse processes of the lumbar vertebrae (Figure 17.1). This creates an area of anesthesia under the inverted L block. Advantages of the inverted L block are that it is simple to perform, it does not interfere with ambulation, and deposition of anesthetic away from the incision site minimizes incisional edema and hematoma [1]. Disadvantages include incomplete analgesia and muscle relaxation of the deeper layers of the abdominal wall (particularly in obese animals), possible toxicity after larger doses of anesthetic, and increased cost because of larger doses of local anesthetic [1].

Figure 17.1 Inverted L. Ventral branches of labeled T13 and L1 to L4 are desensitized by this block. T13, Last thoracic nerve; L1–4, first to fourth lumbar spinal nerves.

Source: From [1], © 2007, John Wiley & Sons.