Cervical seatbelt sign and CTA

Summary: No CTA for isolated cervical seatbelt sign.

Good blog post.
http://wueverydayebm.blogspot.com/2014/07/does-cervical-seatbelt-sign-mandate.html
Take Home:
CT-angiogram is not necessarily indicated based on the finding of a cervical seatbelt sign alone in the absence of significant hematoma, neurologic symptoms, or other traumatic injuries.

EAST Guideline:
https://www.east.org/education/practice-management-guidelines/blunt-cerebrovascular-injury
What patients are of high enough risk, so that diagnostic evaluation should be pursued for the screening and diagnosis of BCVI?
1. Patients presenting with any neurologic abnormality that is unexplained by a diagnosed injury should be evaluated for BCVI.
2. Blunt trauma patients presenting with epistaxis from a suspected arterial source after trauma should be evaluated for BCVI.
3. Asymptomatic patients with significant blunt head trauma as defined below are at significantly increased risk for BCVI and screening should be considered. Risk factors are as follows:
* Glasgow Coma Scale score ≤8;
* Petrous bone fracture;
* Diffuse axonal injury;
* Cervical spine fracture particularly those with (i) fracture of C1 to C3 and (ii) fracture through the foramen transversarium;
* Cervical spine fracture with subluxation or rotational component; and
* Lefort II or III facial fractures

From EAST Guideline:
An isolated cervical seat belt sign without other risk factors and normal physical examination has failed to be identified as an independent risk factor in two retrospective studies and should not be used as the sole criteria to stratify patients for screening.
References:
https://www.ncbi.nlm.nih.gov/pubmed/12013287
https://www.ncbi.nlm.nih.gov/pubmed/12013287

Alternate Screening Guidelines:

Screening Criteria for BCVI adapted from Biffl et al[10] (with permission)
Screening Criteria for BCVIInjury mechanism

  • Severe cervical hyperextension/rotation or hyperflexion, particularly if associated with
    • Displaced midface or complex mandibular fracture
    • Closed head injury consistent with diffuse axonal injury
  • Near hanging resulting in anoxic brain injury Physical signs
  • Seat belt abrasion or other soft tissue injury of the anterior neck resulting in significant swelling or altered mental status

Fracture in proximity to internal carotid or vertebral artery

  • Basilar skull fracture involving the carotid canal
  • Cervical vertebral body fracture
Denver Modification of Screening Criteria for BCVI adapted from Cothren et al[51] (with permission)
Denver Modification of Screening CriteriaSigns/symptoms of BCVI

  • Arterial hemorrhage
  • Cervical bruit
  • Expanding cervical hematoma
  • Focal neurological deficit
  • Neurologic examination incongruous with CAT scan findings
  • Ischemic stroke on secondary CAT scan

Risk factors for BCVI

  • High-energy transfer mechanism with
    • Lefort II or III fracture
    • Cervical spine fracture patterns: subluxation, fractures extending into the transverse foramen, fractures of C1-C3
    • Basilar skull fracture with carotid canal involvement
    • Diffuse axonal injury with GCS =6
    • Near hanging with anoxic brain injury

Studying Core Texts

I’ve recently had several of the interns asking me about studying. I think all of us should be studying one of the core texts: Rosen’s, Tintinalli’s, or Harwood-Nuss. My own preference is for Tintinalli’s for a number of reasons. It is the most direct, in terms of what do I need to know to take care of a patient with this condition. It is also slightly more comprehensive than Rosen’s. I also love that it has three versions: Emergency Medicine: A Comprehensive Study Guide; Emergency Medicine Manual (with a new version coming out soon); and Emergency Medicine: Just the Facts. For those that don’t know, the manual is a shortened version of the big book, still in paragraph form.  Just the Facts is an outline version. I use the big book as my primary resource, the manual when I just can’t make myself read the renal chapter, and Just the Facts as a quick review.

Rosen’s is a wonderful book, extremely well written, and something I plan to read after residency. Hawood-Nuss is too simplistic, leaves out too much of what a good ER doctor needs to know, and in my opinion is only suitable for NPs and PAs.

If you are trying to decide which book works for you, pick a couple of chapters of each book, read the chapters and see what works better. Notice that I say a couple chapters, because each chapter is written by different authors. You don’t won’t to stick with less than ideal book, just because one chapter was written beautifully.

A resource I recently discovered and have been enjoying is CrackCast. It is written by a Canadian group and they publish a new lecture each week going over a single chapter of Rosen’s, in order. Now even though I am a Tintinalli’s man and the material is slightly different, core content is core content. The lectures are wonderful.

CRACKCast

Something else wonderful about this group is their belief in spaced repetition. The group publishes flashcards for every lecture that they do.

Flashcards

For our interns, here are a couple previous blog posts about learning and spaced repetition:

Science of Learning

Spaced Repetition

 

 

Straight to the cuff

To get us and RT on the the same page with stylet shaping in ETI.

First, what does our text book say about it:

Screen Shot 2015-07-28 at 8.10.24 PM Screen Shot 2015-07-28 at 8.11.19 PM

In case anyone doesn’t recognize this, it’s from Robert’s and Hedge’s Procedures in Emergency Medicine. This is the “other” textbook, that you absolutely have to read.

For some more on this topic:

http://www.epmonthly.com/features/current-features/avoiding-common-laryngoscopy-errors-part-ii/

This is from Dr Rich Levitan. He is the king of the airway, and I highly recommend his book, The AirwayCam Guide to Intubation.

For the interested learner, or those to lazy to read the above, here are some video examples:

Finally, if anyone feels the need to brush up on intubation in general, here are two more of my favorite resources.

Scott Weingart

And the omnipresent Life in the Fastlane:

http://lifeinthefastlane.com/own-the-airway/

JG MD

 

Spaced Repetition

21st century learning. This is a follow up and an expansion on what Martin touched on the other day. There will be a separate post that follows with an easy means of implementation.
Background information:
Or skip to a Life in the fast lane post which provides similar info:
A Wired magazine article on spaced repetition software:
A review of spaced recall with numerous citations:
A department of education report illustrating the implementation of spaced repetition:
Free open source, cross platform, spaced repetition software, Anki:
A guide to making flashcards for effective spaced repetition:
A couple general articles on spaced repetition:

Donovan, J. J., & Radosevich, D. J. (1999). A meta-analytic review of the distribution of practice effect: Now you see it, now you don’t. Journal of Applied Psychology, 84(5), 795-805.

Stahl SM, Davis RL, Kim DH, Lowe NG, Carlson RE, Fountain K, Grady MM. Play it Again: The Master Psychopharmacology Program as an Example of Interval Learning in Bite-Sized Portions. CNS Spectr. 2010 Aug;15(8):491-504. PMID:20703196.

Several articles by a Harvard Urologist about the implementation of spaced repetition in medical education:
1: Kerfoot BP. Adaptive spaced education improves learning efficiency: a
randomized controlled trial. J Urol. 2010 Feb;183(2):678-81. doi:
10.1016/j.juro.2009.10.005. PubMed PMID: 20022032.


2: Kerfoot BP. Interactive spaced education versus web based modules for teaching
urology to medical students: a randomized controlled trial. J Urol. 2008
Jun;179(6):2351-6; discussion 2356-7. doi: 10.1016/j.juro.2008.01.126. Epub 2008 
Apr 18. PubMed PMID: 18423715.


3: Kerfoot BP, DeWolf WC, Masser BA, Church PA, Federman DD. Spaced education
improves the retention of clinical knowledge by medical students: a randomised
controlled trial. Med Educ. 2007 Jan;41(1):23-31. PubMed PMID: 17209889.


4: Kerfoot BP, Brotschi E. Online spaced education to teach urology to medical
students: a multi-institutional randomized trial. Am J Surg. 2009
Jan;197(1):89-95. doi: 10.1016/j.amjsurg.2007.10.026. Epub 2008 Jul 9. PubMed
PMID: 18614145.


5: Kerfoot BP, Fu Y, Baker H, Connelly D, Ritchey ML, Genega EM. Online spaced
education generates transfer and improves long-term retention of diagnostic
skills: a randomized controlled trial. J Am Coll Surg. 2010
Sep;211(3):331-337.e1. doi: 10.1016/j.jamcollsurg.2010.04.023. Epub 2010 Jul 13. 
PubMed PMID: 20800189.

Science of Learning

To all the new interns:

You are starting a new phase of your education. One that is largely self directed. We have our core texts, Rosen’s, Tintinalli’s, and Harwood-Nuss, which you will pick one of and begin to work through. We also have the supplemental, but extremely mandatory books like Robert’s and Hedge’s Procedures in Emergency Medicine. This post is a suggestion to add one more book up front and potentially make your time reading more valuable.

Make It Stick

 

The purpose of this post is to save you from wasting hundreds of hours reading and rereading to find that little has stuck at the end of it. The pre-eminent point of this book is that recall trumps repetition. Actively trying to remember is a hundred fold more productive than rereading.

Here’s a quick summary of other points:

  • Learning is deeper and more durable when it’s effortful. Learning that’s easy is like writing in sand, here today and gone tomorrow.
  • We are poor judges of when we are learning well and when we’re not. When the going is harder and slower and it doesn’t feel productive, we are drawn to strategies that feel more fruitful, unaware that the gains from these strategies are often temporary.
  • Rereading text and massed practice of a skill or new knowledge are by far the preferred study strategies of learners of all stripes, but they’re also among the least productive. By massed practice we mean the single-minded, rapid-fire repetition of something you’re trying to burn into memory, the “practice-practice-practice” of conventional wisdom. Cramming for exams is an example . Rereading and massed practice give rise to feelings of fluency that are taken to be signs of mastery, but for true mastery or durability these strategies are largely a waste of time.
  • Retrieval practice—recalling facts or concepts or events from memory— is a more effective learning strategy than review by rereading. Periodic practice arrests forgetting, strengthens retrieval routes, and is essential for hanging onto the knowledge you want to gain.
  • When you space out practice at a task and get a little rusty between sessions, or you interleave the practice of two or more subjects, retrieval is harder and feels less productive, but the effort produces longer lasting learning and enables more versatile application of it in later settings.
  • Trying to solve a problem before being taught the solution leads to better learning, even when errors are made in the attempt.
  • People do have multiple forms of intelligence to bring to bear on learning, and you learn better when you “go wide,” drawing on all of your aptitudes and resourcefulness, than when you limit instruction or experience to the style you find most amenable.
  • When you’re adept at extracting the underlying principles or “rules” that differentiate types of problems, you’re more successful at picking the right solutions in unfamiliar situations. This skill is better acquired through interleaved and varied practice than massed practice.
  • In virtually all areas of learning, you build better mastery when you use testing as a tool to identify and bring up your areas of weakness.
  • Elaboration is the process of giving new material meaning by expressing it in your own words and connecting it with what you already know. The more you can explain about the way your new learning relates to your prior knowledge, the stronger your grasp of the new learning will be, and the more connections you create that will help you remember it later.
  • Rereading has three strikes against it. It is time consuming. It doesn’t result in durable memory. And it often involves a kind of unwitting self-deception, as growing familiarity with the text comes to feel like mastery of the content.
  • It makes sense to reread a text once if there’s been a meaningful lapse of time since the first reading, but doing multiple readings in close succession is a time-consuming study strategy that yields negligible benefits at the expense of much more effective strategies that take less time. Yet surveys of college students confirm what professors have long known: highlighting, underlining, and sustained poring over notes and texts are the most-used study strategies, by far.
  • Rising familiarity with a text and fluency in reading it can create an illusion of mastery. As any professor will attest, students work hard to capture the precise wording of phrases they hear in class lectures, laboring under the misapprehension that the essence of the subject lies in the syntax in which it’s described. Mastering the lecture or the text is not the same as mastering the ideas behind them . However, repeated reading provides the illusion of mastery of the underlying ideas. Don’t let yourself be fooled. The fact that you can repeat the phrases in a text or your lecture notes is no indication that you understand the significance of the precepts they describe, their application, or how they relate to what you already know about the subject.

Summary above from: https://rkbookreviews.wordpress.com/2014/06/06/make-it-stick-summary/

I’ve made sure everyone has access to this book. If anyone has any questions, feel free to email me.

Rosen flashcards

8400 flashcards based on the 7th Edition of Rosens Emergency Medicine Concepts and Clinical Practice.

The flash cards are attached. Here is the site I got them from:

A post on how to use them with anki:
A post on ‘Life in the Fast Lane’ on the use of anki in EM:
An alternative method for someone who doesn’t want to get into flashcards or the software but would like a good study guide, the text files can easily be turned into tables for quick review. I attached an example.
If anyone has any questions, let me know.