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Chapter 32C. Ultrasound-Guided Lateral Femoral Cutaneous Nerve Block

Regarding the lateral femoral cutaneous nerve (LFCN), which of the following statements is correct?

A. The LFCN is visualized between the tensor fasciae latae and the sartorius muscle.

B. The LFCN is 1–2 cm superior to the anterior superior iliac spine (ASIS).

C. The LFCN is a hyperechogenic structure with a hypogenic rim.

D. The LCFN is easily followed distally.

A is correct. The LFCN is visualized between the tensor fasciae latae and the sartorius muscle.

B is incorrect. The LFCN is 1–2 cm inferior to the ASIS.

C is incorrect. The LFCN is a hypoechogenic structure with a hyperechogenic rim.

D is incorrect. The LFCN can be followed more proximally; distally it disappears.

Regarding the block of the LFCN, which of the following statements is correct?

A. The patient is positioned supine with the legs flexed.

B. A curved probe is ideal when performing an LFCN block.

C. Landmark techniques are very accurate when performing an LFCN block.

D. A needle with a length between 3–5 cm is used for an LFCN block.

D is correct. A needle with a length between 3–5 cm is used for an LFCN block.

A is incorrect. Patient should have legs extended.

B is incorrect. A linear probe is used.

C is incorrect. There is a highly variable anatomy, which makes it very challenging for landmark-based technique.

Regarding the block of the LFCN, which of the following statements is correct?

A. Scrotal pain is a good indication for performing block of LFCN.

B. Meralgia paresthetica is a good indication for performing block of LFCN.

C. In children, a volume of 1.5 mL/kg is necessary.

D. The needle is inserted in a medial-to-lateral orientation.

B is correct. Meralgia paresthetica is a good indication for performing block of LFCN.

A is incorrect. Innervation of LFCN is sensory on the lateral aspect of the thigh.

C is incorrect. A volume of 0.15 mL/kg is sufficient in children.

D is incorrect. The needle is inserted in a lateral-to-medial orientation.

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