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Related Concept Videos

Spinal Nerves: Plexus I01:22

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Nerve plexuses are networks of interlacing nerves that serve as communication hubs to distribute and organize nerve action across various body regions. The nerve plexuses are organized into the cervical plexus located in the neck region, brachial plexus in the shoulder area, lumbar plexus found in the lower back, sacral plexus situated in the pelvis, and coccygeal plexus located in the coccygeal region.
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The plexuses of the lower body include the lumbar, sacral, and coccygeal plexuses, which innervate the abdomen, pelvis, legs, and coccygeal region. These plexuses control the transmission of sensory information and coordinate motor functions of the lower body.
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Intravenous regional anesthesia or the Bier block technique is used to anesthetize a specific limb or extremity. It uses exsanguinated or blood-drained vessels to transport local anesthetics or LAs to the peripheral nerve trunks. Lidocaine without vasoconstrictors like epinephrine is most commonly used for this technique. Other drugs used are prilocaine, ropivacaine, and chloroprocaine. Bupivacaine is not recommended for this technique due to its high cardiac toxicity.
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Ultrasound-Guided Lumbar Plexus Injection: A Cadaveric Validation.

Ondřej Naňka1, Kamal Mezian2, Ke-Vin Chang3,4,5

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Summary

Ultrasound-guided lumbar plexus injection is feasible for targeting L3 and L4 nerve roots. This technique shows potential for clinical pain management, but requires further study with more cadavers.

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Area of Science:

  • Anatomy
  • Pain Management
  • Medical Imaging

Background:

  • Ultrasound (US) is increasingly used for axial spine evaluation.
  • Its accuracy for superficial structures is established, but evidence for deeper targets like the lumbar plexus is limited.

Purpose of the Study:

  • To assess the feasibility of ultrasound-guided lumbar plexus injection.
  • To evaluate dye spread patterns following injection at L3 and L4 nerve roots.

Main Methods:

  • A cadaveric study using a fresh-frozen female specimen.
  • Ultrasound-guided injection with a 2-5 MHz transducer and a 20-gauge spinal needle.
  • Delivery of 5 mL green dye targeting L3 and L4 nerve roots with in-plane approach.

Main Results:

  • Dissection confirmed L3 injection spread dye to the extraforaminal region.
  • L4 injection showed anterior dye distribution adjacent to the intervertebral foramen.
  • Acoustic shadowing from articular processes limited visualization.

Conclusions:

  • Ultrasound-guided lumbar plexus injection is feasible.
  • The technique shows potential for clinical pain management applications.
  • Further validation with larger sample sizes is warranted.