Highland Femoral Block protocol: Joint Orthopedics and Emergency Department

1)  Femoral nerve block is now considered the standard of care for acute pain management for femoral fractures including hip and femoral shaft fractures.

2)  Femoral nerve blocks are most beneficial when placed as quickly as possible after injury and should be placed by qualified ED staff as soon after presentation as possible after appropriate evaluation for high-risk features and contraindications.

3)  Femoral nerve blocks have several serious potential complications including: a) potential masking of the clinical signs of an emerging compartment syndrome leading to delay in diagnosis, b) nerve injury c) local anesthetic toxicity.

4) Patients with with the following high risk clinical features are not appropriate for a femoral block.  (Rare exceptions can be made on a case-by-case basis at the discretion of the attending orthopedic surgeon only. )

a) Clinical signs suggestive of an expanding thigh compartment at risk for compartment syndrome

b) Clinical signs suggestive of femoral nerve injury or deficit.

c) Clinical signs of a significant vascular injury with potential to produce elevated compartment pressures.

d) Open femoral fractures.

5) Standard best practice technique and general contraindications and indications for regional anesthesia in an acutely injured patient apply

Working with your orthopedist

A common question from ED docs getting started using ultrasound-guided regional anesthesia is around working with the orthopedic staff who may not have familiarity with regional anesthesia.  Here are some scenarios and potential ways around them.

"Don't block until I (orthopedist), I need to be able to perform a neurologic exam"

I can understand where they are coming from. They don't see the patient in pain in front of them, they don't feel the urgency to get pain under control right away.  But from the perspective of the patient this is just means needless suffering. What's more is that long-term once the orthopedist is able to see the results of improved analgesia and anesthesia using blocks, most are "converted" and start to not just allow, but expect them to be done in the ED. 

What you can do:

Create a consensus pre-block neurologic exam protocol that is injury specific.  Start with hip fractures and work with your orthopedist to identify what specific physical exam tests she/he would like performed.  Be as specific as possible, such as, "light touch on the lateral thigh 6-10 cm below the ASIS." or "plantar flexion strength out of 5."  Create a way to document this.   Take ownership of the integrity of your exam so that it can be trusted.  

Agree on the goal of as short a "door to block time" as possible and discuss how long is too long to wait.  If the orthopedist is 10 minutes or less away, spend that time consenting and getting ready for the block, let him/her get the exam then place the block.  Waiting 2 hours on the other hand is not acceptable. 

Involve your orthopedist in training 

Orthopedists can learn blocks too.  This is one of the best ways to get  them up to speed.  Again the femoral nerve block is a great place to start.  Once they see the power and benefits, you get their buy-in.

 

"Don't block him, he might develop compartment syndrome"  

The data is patchy and inconsistent on compartment syndrome, know one really knows what is a late sign, what is early, what is best way to monitor etc...What we can all agree on is that it is a devastating injury if there is a delay.  In the face of ambiguity and fear or complication, some orthopedists may simply "opt out" and blanket oppose blocks.  

Start with the femoral block , the risk of thigh compartment syndrome is incredibly rare in most traumatic femoral/hip fractures.  This should be a great place to start to get the orthopedist comfortable and used to the blocks.  

Use short-acting local anesthetic.  Try chloroprocaine or lidocaine so that the block wears off in at most a few hours. If at the time of block there are no physical signs of compartment syndrome, it would nearly impossible to rapidly develop acute compartment syndrome in just a few hours. 

Avoid tib / fib fractures until you have a very well developed relationship with your orthopedist and a robust protocol to monitor the patient. 

For a good discussion and some resources go here:

https://drive.google.com/folderview?id=0B0pEWsxV4N3CZjk1OGY2MjktNzI3Zi00ZTgwLWI3YzktY2FmMDkwNTk4YTdk&usp=sharing 

 

 

Emergency Perineural Femoral catheter

Placement of catheter allows an incredible amount of flexibility to tailor a block to the clinical circumstance.  In our ED the median length of stay is 14 hours, we see large volumes of trauma and a well placed catheter allows re-dosing as needed.  A multimodal approach with peri-neural catheters is now standard for battle field pain control.  Ironically, we are way behind in most domestic EDs

Ban Tsui, an anesthesiologist at University of Alberta, has devised a simple catheter that is placed much like a regular IV line.  Our initial experience has been very impressive indeed.  Consider this case.  

64yoF head-on MVC at freeway speeds with dislocated shoulder and shattered femur. She was initially in severe pain despite sedation and IV analgesia complicated by severe respiratory depression.  An interscalene block was placed and the shoulder was reduced effortlessly.  2-chloroprocaine was used for its fast onset and low toxicity profile.  A perineural catheter was placed at the femoral nerve without complication and doses on three separate occasions during here.  The analgesia was excellent, she remained alert and comfortable and underwent multiple transfers for placement of a Steinman pin and repeat xrays and CT scanning. 

 

 

 

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 Arrowheads show catheter. IM iliacus muscle. asterisk catheter tip. Yellow arrow femoral nerve

Arrowheads show catheter. IM iliacus muscle. asterisk catheter tip. Yellow arrow femoral nerve

 Another patient again showing catheter under the femoral nerve

Another patient again showing catheter under the femoral nerve

 Catheter during redosing 6 hours after initial placement.

Catheter during redosing 6 hours after initial placement.

Posterior tibial blocks are the best analgesia for calcaneal fractures

The posterior tibial block is one every EP should know.  Download and view or how to HERE

CASE: Bilateral calcaneal fractures after falling off a roof.  He was on a roof and then somehow got into a water fight with kids.  The kids won. He slid face first down the roof, grabbed the gutter, did a flip and landed on his heels on the concrete below resulting in bilateral calcaneal fractures.
   In the ED, given the mechanism, he required a trauma service consult and an orthopedics consult combined with pain film imaging of his lower extremities and lumbar spine CT.
  To accomplish all this, the patient was in the ED for several hours.  Morphine took the edge off, but he complained of persistent 9/10 pain.

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Posterior Tibial block for calcaneal fractures
This works so well because the calcaneous itself is innervated primarily by its namesake nerve that is a terminal branch of the posterior tibial nerve.  The patient will loose sensation to the sole of the foot but retain motor function at the ankle and toes.    The advantage of the selective block is that it should not disrupt the neurologic exam in a patient with a potential lumbar fracture. The disadvantage is that the associated trauma such as ankle sprain will likely continue to cause some pain.

I would consider this an entry level block.  The positioning is straightforward, the needling shallow, and the major structure to avoid ( the posterior tibial artery) is easy to identify.  The only issue that comes up is that although the nerve ALWAYS runs adjacent to the artery, it can at times run deep to it, anterior to it, or posterior to it.  If you are lost, try gently hydrodissecting with saline around the posterior tibial artery just above the medial malleolus and the typical honeycomb nerve should become clear.

Case resolution

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You guessed it.  It worked beautifully.  We placed bilateral blocks and his pain went to 1/10.  He was very grateful and the workup could be completed in comfort.  He was discharged home with an oral analgesic regimen.



Ultrasound-guided Musculocutaneous block

The musculocutaneous nerve (arrow) in the distal axilla runs in a fascial between the biceps and the coracobrachialis muscles.  The musculocutaneous nerve contributes to the sensory innervation of the elbow; below the elbow it becomes the lateral cutaneous nerve and supplies the skin of the lateral forearm.

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Ultrsound-guided block of the muculocutaneous nerve is best done with arm abducted allowing convenient access to the axilla with an in-plane approach.  The nerve is easily identified 1-2 cm cephalad to the axillary nerves and vessels.

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US-GUIDED POSTERIOR TIBIAL BLOCK

The posterior tibial block is easy to perform and very useful for patients with:

           1. Any laceration or foreign body on the sole of the foot

           2. Calcaneal fractures.

Check out the handy PDF for your iPhone HERE

Check out our brief video that will walk you through the anatomy and how to perform the block HERE

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How would you block this?

38-year-old man was assaulted with a box-cutter resulting in a large laceration across the lateral aspect of his neck.  The laceration extended through the skin, subcutaneous fat, and superficial fascia revealing the underlying muscles and parotid gland.  CT/A of the neck showed no injury to the great vessels and the patient needs wound irrigation and closure.  With a single injection superficial cervical plexus block of 6mL 0.5 bupivacaine this patient had complete anesthesia.

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Welcome the saphenous block

The saphenous nerve is a pesky nerve we tired to ignore for awhile.  The reality is that for trauma in the lower extremity, you must always consider the need to add a saphenous block to your popliteal sciatic block.  In particular, any wound or abscess on the medial aspect of the lower leg is pure saphenous territory. Additionally, many patients have some amount of saphenous innervation to the ankle joint itself.  For a truly complete ankle block, the popliteal sciatic alone won't do.  

The great thing is that the saphenous block is technically very straightforward.  The anatomy is a bit foreign to most of us but quite simple in the end.  This VIDEO will take you through the anatomy and the block technique.

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Interscalene Curriculum and video is up

Tough shoulder dislocation? Enormous deltoid abscess?  That copatation splint not working so great for your elderly patient with a proximal humerus fracture?  

The interscalene block shines in all these scenarios.  With some practice and good understanding of the anatomy, this block can be safely done in just a few minutes.  

It is surprising how shallow this block is.  In many patients the C5 root is less than 1 cm beneath the skin.  This allows for great visualization.  

We have reduced a shoulder with as little as 5mL of lidocaine placed just underneath the prevertebral fascia over the c5 and c6 roots.  

Check out the workbook posted on the left sidebar and the accompanying video HERE.

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Femoral Nerve Block Curriculum is up

The Femoral nerve block curriculum is posted and available here.  This is the one block that EVERY emergency physician should be able to perform quickly and with confidence.  Use this block for 
1. "Hip" fracture analgesia
2. Femoral shaft fractures
3. Patellar fractures
4. Tibial plateau fractures*
5. Lacerations of the medial thigh and medial lower leg (saphenous distribution)

(* always perform in collaboration with ortho given concern for masking a compartment syndrome.)

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Superficial Cervical Plexus Curriuclum is up

The superficial cervical plexus block is an easy block for ear lobe, the neck and submandibular region, and the clavicle.  Great for awake central lines as well.  Perform this at the C4 level (superior pole of the thyroid cartilage) with patient either sitting up off the bed or in later decubitus.  Looking forward to hearing your comments

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