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Brown: Atlas of Regional Anesthesia, 3rd ed., Copyright © 2006 Saunders, An Imprint of Elsevier
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Blockade of the 12th thoracic nerve is effectively carried out by blocking the root immediately superior to the L1 transverse process. This method is often preferable to attempts to block it like an intercostal nerve at the angle of the ribs. If these blocks are used for herniorrhaphy procedures, one should recognize that a long-acting local anesthetic of sufficient concentration to produce motor blockade may limit patients from walking normally for a number of hours because some weakness of the hip flexors may be produced with blockade of the L1 and L2 roots.

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