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Upper/Lower Extremity Nerve BlocksGeneral Overview
University of South FloridaCollege of Nursing
Nurse Anesthesia Program
Program Director Advanced Pain Management Fellowship
John P. Maye PhD, CRNA,CAPT (Ret) USN
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OBJECTIVES
• Describe the four main approaches used for brachial plexus blockade (IS, SC, IC, Axillary)
• Construct the brachial plexus to include, roots, trunks, divisions, cords, and terminal branches
• Describe the various approaches available to provide analgesia to the nerves of the lower extremity
• Appreciate the anatomy of the lumbar plexus and the origination of lower extremity nerves
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OVERVIEWPREVENTATIVE ANALGESIA
WITH REGIONAL ANESTHESIA• Defined: administration of analgesic agents prior to
injury• Reduction in the release of inflammatory mediators
thus reducing pain and improving healing• Secondary benefits of reducing PONV• Immunomodulatory activities of opioids have been
characterized in animal and human studies• Decreases the occurrence of both peripheral and
central sensitization
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OVERVIEW PATIENT SELECTION
• Patient preference (lack of knowledge)• Patient’s coexisting medical conditions
(coagulopathies, medications, pre-existing neuropathies or nerve injuries, medical conditions/COPD)
• Surgeon preference• Skill of provider• Length of procedure
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EQUIPMENT
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APPROACHES TO THE BRACHIAL PLEXUS
• Interscalene• Supraclavicular• Infraclavicular • Axillary
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ANATOMY OF BRACHIAL PLEXUS
• Originates from the intervertebral foramina as cervical nerves 5,6,7,8 and first thoracic nerve
• Contributions from C-4 & T-2 are often minor or absent
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BRACHIAL PLEXUS ANATOMYINTERSCALENE
Trunks/Superior/Middle/Inferior
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BRACHIAL PLEXUS ANATOMYSUPRACLAVICULAR
Divisions (3 anterior/3 posterior)
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BRACHIAL PLEXUS ANATOMYINFRACLAVICULAR
Cords/Lateral/Posterior/Medial
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BRACHIAL PLEXUS ANATOMYAXILLARY
5 terminal branches/medial/radial/ulnar(axillary/musculocutaneous)
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BRACHIAL PLEXUS ANATOMY
• Robert: ROOTS……..5• Taylor: TRUNKS…...3• Drinks: DIVISION….6• Cold: CORDS……..3• Beer: BRANCHES..5
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TERMINAL NERVES
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BRACHIAL PLEXUS ANATOMY
• Intercostobrachial nerve and median cutaneous nerves of forearm leave sheath early
• Reside in subcutaneous tissue near axillary block needle insertion site
• Musculocutaneous nerve contained within Coracobrachialis muscle
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BLOCK ASSESSMENT
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LOWER EXTREMITY INTRODUCTION • Regional anesthesia of the lower extremity involves
two major nerve plexuses, the lumbar plexus and the sacral plexus
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LOWER EXTREMITY INTRODUCTION • Lumbar spinal nerves exit caudad to their
numbered vertebrae and divide into anterior and posterior rami
• Posterior rami of L1 through L5 supply the muscles and skin of the back
• The lumbar plexus consists of the anterior rami of L1 through L4
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LUMBAR PLEXUS INTRODUCTION• The peripheral branches of the lumbar plexus
include the following terminal nerves: Iliohypogastric, Ilioinguinal, genitofemoral, lateral femoral cutaneous, obturator, and femoral
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LUMBAR PLEXUS INTRODUCTION• The plexus forms within the body of the psoas
muscle and the lumbar plexus block (psoas compartment block) consistently blocks the three nerves that supply most of the anterior portion of the lower extremity (femoral, lateral femoral cutaneous, and obturator)
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PSOAS MUSCLE
PS PS
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WHAT ARE MY CHOICESLower extremity nerve blocks
Lumbar plexus nerve blocks• Psoas/lumbar plexus• Fascia Iliaca• Lateral femoral cutaneous, femoral, obturator• Adductor canal/saphenous (saphenous at knee)
Sacral plexus nerve blocks• Sciatic (several approaches)• Common peroneal/tibial (popiteal approach)• Ankle nerve blocks (five nerves)
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L 2-3 L 2-3-4 L 2-3-4 L 4-5, S 1-2-3
Lateral femoralCutaneous
Femoral
Saphenous
Obturator Sciatic
Common Peroneal Tibial
Sural
Superficial Peroneal Deep Peroneal
(Ankle Block)
ORIGINATION OF LOWER EXTREMITY NERVES
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SACRAL PLEXUS
• Sacral plexus is found within the lesser pelvis on the anterior surface of the piriformis muscle.
• Formed from anterior spinal rami of L4 through S4 with most of the nerves leaving through the greater sciatic foramen
• Major nerves are: Superior gluteal nerve ( L4-S1), Inferior gluteal nerve ( L5-S2), Sciatic nerve (L4-S3), Posterior femoral cutaneous (S2-S3), Pudendal nerve (S2-S4)
• Some individuals sit posturing poorly
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LUMBOSACRAL PLEXUS
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TERMINAL NERVE DISTRIBUTION
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ULTRASOUND IMAGE OF FEMORAL NERVE
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ULTRASOUND GUIDED POPLITEAL NERVE BLOCK
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PLEXUS ANESTHESIA SUMMARY
• Know the anatomy• Know the landmarks• Appropriate choice of approach• Assess the block• Actions as a result of assessment (supplement)
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30
QUESTIONS?