Which nerve territories are primarily addressed by a Quadratus Lumborum Block used in a spay procedure?

Which nerve territories are primarily addressed by a Quadratus Lumborum Block used in a spay procedure?

• A. Thoracic nerves to lateral chest wall
• B. Abdominal wall and visceral innervation
• C. Lumbosacral trunk
• D. Cerebral cortex

Answer: (B)

The Quadratus Lumborum Block targets nerves that supply the lower abdominal wall and the visceral structures in that region. By injecting near the quadratus lumborum, the local anesthetic can spread to the thoracoabdominal nerves (which provide sensory innervation to the abdominal wall) and, in some cases, into the paravertebral space to affect visceral afferent fibers that accompany the sympathetic nerves to the peritoneum and abdominal organs. For a spay procedure, you want coverage of the ventral abdominal wall where the incision is made and some visceral pain control from the peritoneum, so this block is well-suited to address both abdominal wall and visceral innervation. The other options point to regions not primarily affected by this block: lateral chest wall nerves, the lumbosacral trunk for pelvis and limbs, or the cerebral cortex, which is not involved in regional anesthesia.

The Quadratus Lumborum Block targets nerves that supply the lower abdominal wall and the visceral structures in that region. By injecting near the quadratus lumborum, the local anesthetic can spread to the thoracoabdominal nerves (which provide sensory innervation to the abdominal wall) and, in some cases, into the paravertebral space to affect visceral afferent fibers that accompany the sympathetic nerves to the peritoneum and abdominal organs. For a spay procedure, you want coverage of the ventral abdominal wall where the incision is made and some visceral pain control from the peritoneum, so this block is well-suited to address both abdominal wall and visceral innervation. The other options point to regions not primarily affected by this block: lateral chest wall nerves, the lumbosacral trunk for pelvis and limbs, or the cerebral cortex, which is not involved in regional anesthesia.