Neuraxial Anesthesia - University of Colorado Denver
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Neuraxial Anesthesia - University of Colorado Denver
Lecture Objectives. Discuss considerations of spinal vs epidural anesthesia.
Review the anatomy. Understand mechanisms of action. Review physiologic
effects.
Neuraxial Anesthesia Prepared by: Brenda A. Bucklin, M.D. Professor of Anesthesiology University of Colorado Denver Health Sciences Center
Lecture Objectives Discuss considerations of spinal vs epidural anesthesia Review the anatomy Understand mechanisms of action Review physiologic effects Review complications Sterile technique
Spinal vs Epidural: How do we decide? Length of procedure Need for prolonged post-op analgesia? Comorbidities
Indications Surgical anesthesia Analgesia
Surgical Anesthesia
Lower abdominal OB/GYN Lower limb Perineal and rectal
A line drawn between the iliac crests crosses the 4th lumbar vertebra
Spinal Ligaments 1. 2. 3.
supraspinous interspinous ligamentum flavum
Lumbosacral Spine
Needle Directions
Needle Directions
Needle Directions
Mechanisms
Mechanism of Spinal Anesthesia Blockade of nerve roots -afferent impulses entering CNS via dorsal roots -efferent impulses leaving CNS via ventral roots
Major Factors Affecting Spinal Anesthetic Level
Baricity Dose Patient position
Distribution of Spinal Anesthetics
Spinal Needle Tips
Why use a pencil point or a cutting spinal needle?
Mechanism of Epidural Anesthesia Diffusion to neural structures
-through dura to CSF -from CSF to spinal cord -from dural root sleeves to nerve roots and spinal cord -from dural root sleeves to spinal nerves
Major Determinant of Block Height
Volume of local anesthetic
Epidural Anesthesia
Epidural: Choice of Local Anesthetic
Local Anesthetics
Physiologic Effects
Respiratory Effects Expiratory function reduced in proportion to anesthetic level Inspiratory function unchanged (diaphragm innervated by cervical plexus)
Cardiovascular Effects Hypotension -related to sympathetic blockade
• Bradycardia
-blockade of cardioaccelerator fibers (T1-T4) decreased outflow from right atrial chronotropic stretch receptors
Cardiovascular Changes During Spinal Anesthesia at Different Segmental Levels
Changes in Various Hemodynamic Parameters as a Function of Epidural Anesthetic Level and Patient Position
Dermatomes
Gastrointestinal Function Hyperperistalsis resulting in nausea/vomiting Decreased hepatic blood flow
ASRA Guidelines •Neuraxial infection is rare but underreported. •Handwashing reduces cross-contamination. •Removing jewelry is prudent. •Surgical masks reduce site contamination. •Chlorhexidine solutions are the antiseptic of choice.