Tuesday, September 23, 2014

Lateral Canthotomy

Here's the scenario:  you're a small community ED on a late Sunday morning.  Let's say a middle aged gentleman walks in your door, complaining of left eye pain and loss of vision after blunt trauma to the area.  Let's say the local Nelson Muntz threw a rock at his face.  Haw haw!



On exam, he has proptosis of this eye, with significant chemosis.  His visual acuity is 20/20 in his unaffected eye but is virtually nonexistent in the affected eye (he has light perception but that's about it).  He has severe limitation of his extraocular muscles. You order a CT of his orbits, and it reveals a retrobulbar hemorrhage.  You grab your TonoPen and check pressures, and it's off the charts.  There is no ophthalmologist in house, and it will take up to an hour for him/her to get there.  Better get out your scissors, doc, because you're about to do a lateral canthotomy.

In recent months I've asked multiple providers about which procedures make them squirm and this one often makes it to the top of their lists.  In the end it's not a terribly complex procedure, but there's something about cutting around the eyeball that is inherently unsettling.



However, these patients have a compartment syndrome of the eye (involving the globe, the ophthalmic artery, and the optic nerve), and it is your job at this point to prevent the patient from having permanent vision loss.  The setup is minimal and brief, as time = retina in this situation, and if the specialist isn't going to be in for a while you're responsible for this one.  The literature suggests that after the initial loss of vision, you have about 120 minutes until the loss is permanent.

Quickly throw a few cc's of lido with epinephrine into the lateral canthus, and then squeeze it with a hemostat to reduce bleeding.  Then snip through the canthus toward the orbital rim.  Pull down and locate the inferior crus of the lateral canthal ligament (this is the cantholysis of the procedure, visualized with the cadaver image below).  Recheck your IOP at this time--if it's still elevated you can snip the superior crus as well.







If done properly the lower lid should fall away from the lid margin.  Often patients have dramatic improvement in vision but it's possible that this may take longer to return (assuming you've cut in time to save the structures).  Just like other facial wounds they tend to heal well without any significant scarring.  Regardless, now you'll really need the specialist for a definitive closure.

Here's a fantastic video courtesy of Dr. Larry Mellick (who is now also following the site!).


As always, these posts are for EDUCATIONAL PURPOSES ONLY.  Don't go chopping up eyeballs ha-ha-ho-ho after one quick glimpse at this site (also a small prize to anyone who gets the reference I just dropped there).

Sources:

Dr. Larry Mellick's YouTube Page

Robers and Hedges' Clinical Procedures in Emergency Medicine.  Chapter 62.


Ballard, S. R., Enzenauer, R. W., O'Donnell, T., Fleming, J. C., Risk, G., & Waite, A. N. (2009). Emergency lateral canthotomy and cantholysis: a simple procedure to preserve vision from sight threatening orbital hemorrhage. Journal of Special Operations Medicine : a Peer Reviewed Journal for SOF Medical Professionals, 9(3), 26–32.

Vassallo, S., Hartstein, M., Howard, D., & Stetz, J. (2002). Traumatic retrobulbar hemorrhage: emergent decompression by lateral canthotomy and cantholysis. Journal of Emergency Medicine, 22(3), 251–256.

Saturday, September 20, 2014

Thank You To EMCurious!



We're moving on up!  Procedures Club is now officially a part of EMCurious.com!  Posts both old and new will be released at http://www.emcurious.com/procedures-club/.  We'll attempt to get one out every week, although that may be a promise we regret at one point.

I think we'll at least keep this blog up for the time being, so keep following!  Email us at proceduresclub@gmail.com with suggestions, tips, critiques, etc.

jps

Monday, September 15, 2014

The Art of the Pediatric Laceration Repair


So what just rolled in the door, leaving a trail of blood behind?  A 26 year old with a stellate laceration to the face after a night of drinking?  No problem, he won't even need local anesthesia. A construction worker with a deep laceration down to his forearm muscle bellies?  Might take up a big chunk of time, but no big deal, we can throw in a handful of horizontal mattresses.

What's that now?  A 0.5 cm forehead laceration?  What's the issue? Why are you so....oh good god...it's....it's....IT'S A TWO YEAR OLD!!?!??!?!

These seemingly trivial lacerations, often small and on the upper face, invoke true fear and loathing in the largely adult trained EP.  We have to sew on a field that's moving and screaming?  For god's sake man, I'm a doctor, not a...

Our friends in the PEM world fortunately have left us with a few hacks to make our lives significantly easier with these kiddos.  So let's stand up to our demons and learn a thing or two!

Before we do anything, let's get this little fella comfortable.  Slap on some of that LET we've heard so much about!  Wait, does this stuff actually do anything?


An RCT from the Canadian Medical Association Journal in 2013 (n=221) showed that these kids did in fact have less pain with the procedure, and were more likely as compared to placebo (51.6% vs. 28.3%) to have a completely pain-free procedure.  In short it often precludes the need for any local anesthesia (because it turns out that kids do not like needles).  It also was shown to increase hemostasis.  So slather that stuff on, but make sure you wait long enough for it to take effect (about 15-20 min).

Do you papoose?  We sure like to!  It is safer for the child in general, as well as it is for us.  I've had a kid actually ask me to put him in there before--maybe it made him feel more secure?



From here on out, distraction is essential.  Again, the data supports that things like music, video games, and cartoons can take the child's mind off what you're doing, and help them relax.  It'll also take the stress away from what is likely an extremely anxious parent as well. There's a cool iPhone app called "Eye Handbook" that has tons of cartoon animations that kids can fixate on, so you always have something in your pocket.

Irrigation can also be alarming to the child, but you can employ a cool Macgyver maneuver thanks to the ingenious Dr. Michelle Lin.  Essentially you can take a collection bin and cut out a rectangular or semi-circular hold from the edge, leaving enough of a lip so that water doesn't trickle out.  You'll want it to look like a hair salon basin.


Anxiolysis isn't required but it can definitely be your friend. A very popular option is intranasal midazolam, with the dose being between 0.2-0.3 mg/kg. Your max dose will be 5 mg.  This plus Thomas the Train on dad's iPad will put your little guy or girl in a zen-like state of serenity.

Some data has shown that intranasal ketamine  (up to 9 mg/kg, go big or home!) can have a high success rate without the use of an IV. However, you're getting into the realm of sedation at this point, not just anxiolysis.  My PEM sources are also not a big fan of this one either, so make sure you really do your research and have the appropriate setup (i.e. pulse ox, end tidal CO2, an extra nurse, etc.) if you're going to undergo this.

In terms of the actual repair, it really just helps to keep it simple.  Simple interrupted!  You may opt to use the absorbables for superficial closure if the wound is small, and you think removing sutures will be a major headache for the kiddo.  Deeper lacs should always make you think of repairing deeper levels with absorbables as the frontalis muscle may be affected.  Just remember that you do need to work faster than you're used to with adults, so make sure you get it right on the first try.

Adhesives like cyanoacrylates can also come in handy in a pinch but you need to ensure that nothing drips down into the eyes of your flailing kiddo if the laceration is on the forehead or eyebrow.  You can get around this by placing a little ridge of petroleum jelly inferior to the wound as a barrier.  You can also place them in Trendelenberg to limit the amount of drippage. If it does get in the eye, DON'T USE WATER TO IRRIGATE!  This might cause the polymerization to accelerate, so you'll actually want to use topical antibiotics like erythromycin (remember, it causes it to break down) instead.  And call an ophthalmologist.

As always, these posts are made for EDUCATIONAL PURPOSES ONLY.  Treat each of these children as if they were one of your own!


jps

Sources:


Harman, S., Zemek, R., Duncan, M. J., Ying, Y., & Petrcich, W. (2013). Efficacy of pain control with topical lidocaine-epinephrine-tetracaine during laceration repair with tissue adhesive in children: a randomized controlled trial. CMAJ : Canadian Medical Association Journal = Journal De l'Association Medicale Canadienne, 185(13), E629–34. doi:10.1503/cmaj.130269

Academic Life in Emergency Medicine - "Trick of the Trade: Pediatric Distractors"  http://www.aliem.com/trick-of-the-trade-pediatric-distractors/


Sinha, M. (2006). Evaluation of Nonpharmacologic Methods of Pain and Anxiety Management for Laceration Repair in the Pediatric Emergency Department. Pediatrics, 117(4), 1162–1168. doi:10.1542/peds.2005-1100


Tsze, D. S., Steele, D. W., Machan, J. T., Akhlaghi, F., & Linakis, J. G. (2012). Intranasal ketamine for procedural sedation in pediatric laceration repair: a preliminary report. Pediatric Emergency Care, 28(8), 767–770. doi:10.1097/PEC.0b013e3182624935