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Chapter 32C. Ultrasound-Guided Lateral Femoral Cutaneous Nerve Block
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Regarding the lateral femoral cutaneous nerve (LFCN), which of the following statements is correct?
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A. The LFCN is visualized between the tensor fasciae latae and the sartorius muscle.
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B. The LFCN is 1–2 cm superior to the anterior superior iliac spine (ASIS).
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C. The LFCN is a hyperechogenic structure with a hypogenic rim.
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D. The LCFN is easily followed distally.
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A is correct. The LFCN is visualized between the tensor fasciae latae and the sartorius muscle.
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B is incorrect. The LFCN is 1–2 cm inferior to the ASIS.
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C is incorrect. The LFCN is a hypoechogenic structure with a hyperechogenic rim.
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D is incorrect. The LFCN can be followed more proximally; distally it disappears.
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Regarding the block of the LFCN, which of the following statements is correct?
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A. The patient is positioned supine with the legs flexed.
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B. A curved probe is ideal when performing an LFCN block.
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C. Landmark techniques are very accurate when performing an LFCN block.
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D. A needle with a length between 3–5 cm is used for an LFCN block.
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D is correct. A needle with a length between 3–5 cm is used for an LFCN block.
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A is incorrect. Patient should have legs extended.
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B is incorrect. A linear probe is used.
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C is incorrect. There is a highly variable anatomy, which makes it very challenging for landmark-based technique.
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Regarding the block of the LFCN, which of the following statements is correct?
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A. Scrotal pain is a good indication for performing block of LFCN.
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B. Meralgia paresthetica is a good indication for performing block of LFCN.
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C. In children, a volume of 1.5 mL/kg is necessary.
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D. The needle is inserted in a medial-to-lateral orientation.
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B is correct. Meralgia paresthetica is a good indication for performing block of LFCN.
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A is incorrect. Innervation of LFCN is sensory on the lateral aspect of the thigh.
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C is incorrect. A volume of 0.15 mL/kg is sufficient in children.
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D is incorrect. The needle is inserted in a lateral-to-medial orientation.
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