Ultrasound in Neurolysis - School of Medicine...Sound Wave Transformation •Frequency •Energy –...

Ultrasound in Peripheral Nerve Interventions

John L. Lin, M.D. Shepherd Center

Assistant Clinical Professor Emory University, School of Medicine

Outline

• Ultrasound basics

• Nerve blocks in physiatric setting

• Ultrasound with nerve blocks

Ultrasound Basics

• Sound wave energy is transformed when it interacts upon different medium

– Reflected

– Absorbed

– Transformed

Sound Wave Transformation

• Frequency

• Energy – heat, electricity, mechanical energy / vibration…etc.

• Density of median -> impedance

• High impedance difference -> high echogenicity

– Mineral, fluid, gas

Ultrasound Machines

• Transforms electricity to ultrasound

• Receives reflected ultrasound and transforms to electricity

• Display of digital images

Ultrasound transducers

• Transforms electricity to vibrations of the piezoelectric crystals

• Higher frequency -> higher resolution, lower penetration

• 15 – 17 MHz

J Ultrasound Med 2002; 21:315

Sonographic Appearance

• Fluid – anechoic

• Muscle – relatively hypoechoic

• Tendon – hyperechoic

• Nerve – hyperechoic

• Bone, cortex – hyperechoic with acoustic shadow

Shibata, Yasuyuki, and Misako Harato. Ultrasound-Guided Anterior Sciatic Nerve Block.

Lateral Medial

Adductor

Longus

Adductor Brevis

Adductor

Magnus

Sciatic Nerve

Doppler Effect

• Sound wave travelling away decreases in frequency

• Sound wave travelling towards increases in frequency

Doppler Imaging

• http://www3.medical.philips.com/en-us/secure/images_site/largeImage.asp?size=blowup&classcode=01&appcode=w&imagename=0639%2DEnVHD%2DL12%2D3%2DVASC%2DBICPA&systemcode=e&div=ultra

Anisotropy

Nerve Blocks

• Management of spasticity, contractures

• Pre-serial casting transient blocks

• Pre-manipulation blocks

• Diagnostic / therapeutic

Ultrasound Imaging for Nerve Blocks

• Brachial Plexus

• Suprascapular

• Median – elbow, carpal tunnel

• Ulnar

• Radial

• Femoral

• Obturator

• Sciatic

• Tibial

Brachial Plexus

• Preparation for regional shoulder manipulations

• Anesthetic block

AnaesthesiaUK: Home>>Resources>>Anatomy>>Anatomy for anaesthetists>>Applied anatomy for upper limb blocks

http://www.frca.co.uk/article.aspx?articleid=100359# (August 30, 2011)

Brachial Plexus – Anatomical Appraoch

Brachial Plexus – Interscalene Approach

The New York School of Regional Anesthesia>> Home>> Nerve Blocks >>Ultrasound-Guided Techniques >>Ultrasound-Assisted Nerve Blocks (14/03/2009)

http://www.nysora.com/peripheral_nerve_blocks/ultrasound-guided_techniques/3063-ultrasound_assisted_nerve_blocks.html (Aug 30, 2011)

Brachial Plexus - Interscalene

• http://www.eorthopod.com/content/thoracic-outlet-syndrome

Brachial Plexus - Interscalene

• http://www.eorthopod.com/content/thoracic-outlet-syndrome

Brachial Plexus – Suprascapular Artery

• Yasuyuki Shibata. The Suprascapular Artery and the Brachial Plexus.

Brachial Plexus - Supraclavicular

Supraclavicular – Suprascapular Nerve

Brachial Plexus – Infraclavicular

• Yasuyuki Shibata. Ultrasound-Guided Infraclavicular Brachial Plexus Block.

Brachial Plexus – Infraclavicular

• Yasuyuki Shibata. Ultrasound-Guided Infraclavicular Brachial Plexus Block.

Musculocutaneous Nerve

Musculocutaneous and Axillary

The New York School of Regional Anesthesia>> Home>> Nerve Blocks >>Ultrasound-Guided Techniques >>Ultrasound-

Assisted Nerve Blocks (14/03/2009)

Suprascapular Nerve

• Preparation for regional shoulder manipulations

• In conjunction with other blocks

– Axillary nerve

– Intra-articular

– Acromio-clavicular

– Sub-acromial bursa

Suprascapular Nerve

• Pain Physician 2007; 10:743-746

Median Nerve

• Diagnostic / Therapeutic blocks

• Carpal tunnel injections

Median Nerve

Carpal Tunnel Anatomy

• Daniel Shelton, Carpal Tunnel: Bifid Median Nerve -SonoSite Case Study, www.MSKSono.com, SonoSite

Proximal Carpal Tunnel Probe Placement

Proximal Carpal Tunnel Probe Placement - Transverse

• Ultrasound Evaluation for Carpal Tunnel Syndrome, Viewsono.com

Proximal Carpal Tunnel Probe Placement - Longitudinal

Median Nerve Edema

Carpal Retinaculum Release

Ulnar Nerve

• Finger / wrist flexor dennervations

– Pre splinting / casting

• Epicondylar groove

Radial Nerve

Femoral Nerve

• Extensor contracture of quadriceps

• Diagnosis of the extent of tone versus soft tissue contracture prior to placing a temporary intrathecal baclofen infusion pump

Femoral Nerve

Lateral Medial

Femoral Artery

Iliopsoas Muscle

Femoral Nerve

Obturator Nerve

• Adductor spasticity / contractures

• Primarily for neurolysis

Obturator Nerve

• Rabah, Danny M. and Ahmed K. Thallaj. Phase 1 Study, Safety and Feasibility of Ultrasound Guided Obturator Nerve Block in Transurethral Surgery

US Guided Obturator Nerve Block

• Rabah, Danny M. and Ahmed K. Thallaj.

• Phase 1 Study, Safety and Feasibility of Ultrasound Guided Obturator Nerve Block in Transurethral Surgery

• 18 consecutive men, ages 54-95, mean 69

• Mean time for procedure 4.2 min

• Successful block 97.2%

• Yasuyuki Shibata. Ultrasound-Guided Obturator Nerve Block.

Sciatic / Tibial Nerves

• Pre-serial short leg casting of ankle contractures

• Diagnostic block

– Deformity, e.g. hammer toe refractory to intramuscular motor point blocks

– Versus diagnostic motor point blocks

Sciatic Nerve

Lateral Medial

Adductor

Longus

Adductor Brevis

Adductor

Magnus

Sciatic Nerve

Tibial Nerve

Resources

• Atlas of Ultrasound- and Nerve Stimulation-Guided Regional Anesthesia

• Anatomical overlay of key muscles

• Real time videos on DVD

Resources

• Atlas of Ultrasound- and Nerve Stimulation-Guided Regional Anesthesia

• Extensive list of detailed peripheral nerve blocks

Resources

• Atlas of Ultrasound-Guided Regional Anesthesia: Expert Consult

• Online videos

Resources

• Ultrasound Guided Regional Anesthesia and Pain Medicine

• Numerous pain / sensory nerve blocks

Resources

• Ultrasound in Anesthetic Practice (with DVD)

Resources

• Critical Care Ultrasonography (with DVD)

• Alexander Levitov, Paul Mayo, Anthony Slonim

Resources

• Practical Ultrasound in Anesthesia for Critical Care and Pain Management (with CD)

• Philip M. Hopkins, Andrew R. Bodenham, Scott T. Reeves

Ultrasound in Neurolysis - School of Medicine...Sound Wave Transformation •Frequency •Energy –...

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