An ED Model for Shared Decision Making

The Gist: Shared decision making (SDM) is increasingly common in the ED, yet most people, particularly trainees, are untrained in this area. A proposed framework in an Annals of Emergency Medicine article by Probst et al proposes a framework to guide clinicians (or train them) in the implementation of SDM in the busy ED and combats common misconceptions regarding SDM.
  1. Ask yourself: is this clinical scenario appropriate for SDM - is there clinical uncertainty or equipoise, is the patient capable of engaging in SDM, and is there time?
  2. Have the conversation - Acknowledge that a decision needs to be made and share information about the risks and benefits of each option. Explore the patient's values and circumstances to help come to a decision.
The Case:  The nurses give you a heads up the next patient to be seen is in a lot of pain.  You see a 25-year-old healthy male who is doing the “kidney stone dance” – pacing around the room while holding an emesis basin. He's had left flank pain for the past two hours, nausea, but has a reassuring abdominal exam with minimal tenderness.  His urinalysis shows red cells in the urine and he's feeling better after analgesia.  What's next - CT scan? Ultrasound? Discharge with neither?

An SDM in the Emergency Department Framework from the Probst et al Annals article

1.  Is this scenario appropriate for SDM? 
  • Is there more than one reasonable option at this time?
The current literature regarding renal colic in the ED supports multiple options as the next reasonable

step [1-5]. Non-contrast CT scan is the historic option; yet, recent evidence supports ultrasound as a reasonable next step, and an ultrasound-first diagnostic plan might decrease radiation exposure for this young patient [2]. Experts have also argued that renal colic can be diagnosed clinically, and imaging is not necessary in classic cases with low probability of dangerous alternative diagnoses [1]. The trade-offs between these options might be important to this patient; if he’s feeling better or concerned about lifetime radiation risk, he may not want to wait for a CT scan, and conversely, if he’s about to set off hiking the Appalachian Trail, he may want to know the location and size of his stone.  
Obviously, there are clinical reasons why some cases of suspected renal colic warrant CT scans – fever, concern for an alternate diagnosis, or solitary kidney [6].
  • Is the patient able to make his own medical decisions? 
While this patient may know little about the trade-offs involved in the clinical question, research has
shown that patients do want to be told about the risks of radiation prior to CT scans [7]. This patient isn't altered or otherwise incapacitated - he can participate in decision making.
  • Do you have time? Does your patient have time?
The latter question is easy to answer: unless he’s eloped because he’s feeling better, your patient
clearly has time to have this conversation. Whether you have time depends on the severity of other patients’ conditions and your ability to explain the trade-offs in a manner that he can understand. The more you practice this skill, the better you will be at it, and it’s worth noting that the results of your conversation may speed up his discharge, creating space for another patient and increasing throughput.

2.  Have the conversation (if the answers to the above questions are yes)
  • Acknowledge that a decision needs to be made - 
“I suspect that you have a kidney stone – kidney stones cause severe pain, vomiting, and blood in the urine, all of which you had. At this point, we have to decide if it makes sense to do some more imaging.”
  • Share Information in Regard to Management Options and the Potential Harms, Benefits, and Outcomes of Each - 
“For some people, we do a CT scan – the benefit of a CT is that we know exactly how big the stone is, which helps us know if you’re going to need a procedure from a urologist to get it out. Most people with kidney stones pass the stone by themselves, and the CT isn’t helpful. The downside of a CT is that it takes time and it exposes you to radiation – and we know that every time you get exposed to radiation it increases your future risk of cancer ever so slightly. Also, if your pain comes back and doesn’t go away, it might make more sense to get a CT later – and we wouldn’t want to have to do two CT scans. Most people who have one kidney stone will have another one in the next 10 years – so you could end up with multiple CT scans over your lifetime. The other option is an ultrasound: it gives us some information and sometimes we get a CT scan if we see a lot of swelling in your kidney, but it doesn't show us how big the stone. Because I can do the ultrasound right now, people often go home sooner when they have an ultrasound, if they don’t need a CT. If we decide on the ultrasound, it’s important that you have a doctor you can follow-up with if you are feeling worse.”
  • Explore Patient Values, Preferences, and Circumstances - Probing the patient about what's important to them is key - they may not disclose difficulties with transportation, their activities of daily living, or their travel plans.
“How are you feeling? Do you have a doctor you can see in the next week or so? Would you be able to get back to the ED if you had a problem? Kidney stones usually pass in a week or two – do you have any travel planned?”
  • Decide Together on the Best Option for the Patient, Given His or Her Values, Preferences, and Circumstances
If a patient has a preference, this part is easy – maybe they’re in a hurry, worried about the cost of a CT, or have had multiple CT scans, or maybe they have an upcoming trip and want certainty.
Many patients won't have a preference, and they may ask you for advice. Share your opinion but recognize that there is a huge power differential.

“If I had a kidney stone, and the pain medication worked, I wouldn’t be in a rush to get a CT scan – but might get one in a week or two if I still had alot of pain. If I had some reason that I felt like I needed more information right now, like I was going on a cruise, then I might get the scan.”

Presenting both sides in the explanation of your opinion empowers the patient to choose either the
option you endorsed or the other option without feeling like they are disagreeing with the expert.

1. Wang RC. Managing Urolithiasis. Annals of Emergency Medicine 2016;67(4):449–54.
2. Smith-Bindman R, Aubin C, Bailitz J, et al. Ultrasonography versus Computed Tomography for Suspected Nephrolithiasis. N Engl J Med 2014;371(12):1100–10.
3. Brisbane W, Bailey MR, Sorensen MD. An overview of kidney stone imaging techniques. Nat Rev Urol 2016;:1–9.
4. Fiore M. A proposal algorithm for patients presenting to the Emergency Department with renal colic. Eur J Emerg Med 2016;23(6):456–8.
5. Xiang H, Chan M, Brown V, Huo YR, Chan L, Ridley L. Systematic review and meta-analysis of the diagnostic accuracy of low-dose computed tomography of the kidneys, ureters and bladder for urolithiasis. J Med Imaging Radiat Oncol 2017;:1–9.
6. Türk C, Petřík A, Sarica K, et al. EAU Guidelines on Diagnosis and Conservative Management of Urolithiasis. European Urology 2015;:1–7.
7. Robey TE, Edwards K, Murphy MK. Barriers to computed tomography radiation risk communication in the emergency department: a qualitative analysis of patient and physician perspectives. Acad Emerg Med 2014;21(2):122–9.

Slaying Prehistoric Practice – Killing off the Routine Pulse Check

The Gist: It's time to kill off the routine pulse check every two minutes. While some providers and systems have moved away from routine pulse checks, perfunctory cessation in compression to identify pulses happens as 'the norm' across the United States. Check the rhythm as indicated - without halting compressions if you have a monitor that is able to sense despite compressions or if there is a spike in end tidal capnography (etCO2) or another compelling reason such as gain on arterial line tracing, or during a brief, <10 second pause, if compressions interfere with rhythm analysis [1].

Most of us recognize that, to the best of our knowledge, interruptions in chest compression may be deleterious to return of spontaneous circulation and, theoretically, neurologic outcome [2]. We may even devise complicated ways of reducing time without compressions including mechanical compressions and hands-on defibrillation. These interventions are not evidence based and the yield is minimal. A more simple fix exists - stop checking for pulses routinely.  This isn't some novel wild idea.

The American Heart Association guidelines do not recommend any specific interval for pulse check after the first initial pulse check for healthcare providers [3].  Beginning in 2010,  however, the AHA guidelines begin discouraging routine pulse checks:
"Because of difficulties with pulse assessments, interruptions in chest compressions for a pulse check should be minimized during the resuscitation, even to determine if ROSC has occurred" [4].

It's really difficult to identify pulselessness in < 10 seconds
. Few people can determine the presence of pulselessness in 10 seconds. Dick et al performed a study of patients placed on cardiopulmonary bypass, and providers were blinded to the presence of pulsatile flow. Only two percent of experienced providers (n=209) were able to determine that a patient was pulseless in under 10 seconds [5].
Enforcement of time between compressions may be mitigated by having someone count down from 10 during the rhythm analysis. We often have the individual performing chest compressions do this and they are trained and reminded at the beginning of the resuscitation to resume compressions when they reach zero.

Pulse checks are inaccurate. A study by Tibaballs et al again had providers assess for a pulse in patients on bypass with and without pulsatile flow. They found 78% accuracy in identification of the presence or absence of a pulse [6]. While an accuracy of 78% may seem high, this means that approximately one in four times we are wrong. This means we may feel the reverberation of our own pulse and the truly pulseless patient may have an unnecessary and perhaps deleterious delay in chest compressions. Cardiac ultrasound and arterial line tracings demonstrate contractility and flow with superior diagnostic characteristics, although each has their limitations [7].

Why would we undertake a diagnostic strategy if we know it it is inaccurate and insensitive? Changing practice is difficult. In critical situations we default to what is familiar, what we know.  It is time to move away from the pulse check. We may still need to check for rhythm analysis at periodic intervals, and this is supported by the AHA guidelines. Some monitoring systems allow for this concurrently with compressions (filter out the baseline), while others do not. Many of us are also compelled to search for reversible causes of arrest with ultrasound, many of which do not require an interruption in compressions.

If you're curious about why we are so stubborn to let go of our practices, check out this post on unlearning practices we adore.

1. Soar J et al. "European Resuscitation Council Guidelines for Resuscitation 2015: Section 3. Adult advanced life support." Resuscitation, October 2015, Pages 100 - 1472.
2. Eftestøl T, Sunde K, Steen PA.  Effects of Interrupting Precordial Compressions on the Calculated Probability of Defibrillation Success During Out-of-Hospital Cardiac Arrest. Circulation.2002; 105: 2270-2273.
3. Link MS, Berkow LC, Kudenchuk PJ et al. Part 7: Adult Advanced Cardiovascular Life Support. Circulation. 132(18 suppl 2):S444-S464. 2015
4.Berg RA, Hemphill R, Abella BS et al. Part 5: Adult Basic Life Support: 2010 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. Circulation. 122(18_suppl_3):S685-S705. 2010.
5. Dick WF, Eberle B, Wisser G, Schneider T. The carotid pulse check revisited: what if there is no pulse? Crit Care Med. 2000 Nov;28(11 Suppl):N183-
6. Tibballs J, Weeranatna C. The influence of time on the accuracy of healthcare personnel to diagnose paediatric cardiac arrest by pulse palpation. Resuscitation. 81(6):671-5. 2010.
7. Gaspari R et al. Emergency department point-of-care ultrasound in out-of-hospital and in-ED cardiac arrest. Resuscitation 2016 Sep 27

Unlearning – Yoga For Your Brain

The Gist:  Knowledge translation is a problem in medicine and, at the individual level, unlearning likely contributes to the knowledge translation gap.  It may also exist as part of the solution. Akin to yoga, unlearning requires flexibility, training or deliberate practice, and is enhanced by a community open to skepticism and growth.
  • Note: These musings are not evidence based but are more of a cognitive framework to understand why we have such difficulty individually changing practice.
For an introduction to unlearning, check out this post.  In brief, unlearning, while really an aspect of truly understanding and learning, is complicated.  Most of us find it relatively easy to stuff more information into our brains, a process we perceive as "learning."  Nasal cannula with oxygen at 15 liters per minute plus may help prolong safe apnea time and reduce hypoxia during intubation?  Cool, we can do that.  However, when we are told that something that we routinely do or believe may not necessary or even harmful, we often have more difficulty changing out behavior or "unlearning." Intubating patients with out of hospital cardiac arrest may not be helpful? Preposterous! Unlearning a bit of information is unnatural, it may feel awkward whereas learning, as it often does not put our knowledge or ego in jeopardy.

Flexibility - Unlearning requires cognitive flexibility. When we stretch our bodies, we reach a point where we feel a burn; our body telling us we are approaching our limit. We can push further safely, it just burns slightly more.  Unlearning is essentially the same and is often accompanied by “the burn.”  When we come across information counter to the way we practice, it stings. We may feel defensive. This is “the burn.”  We experience discomfort when we stretch our thinking beyond this. This may be, in part, because we are emotionally tied to our knowledge. We work hard for what we know.  We act quickly in emergency care and must have confidence in what we know, as emergent situations do not typically allow for debate or significant time to think.

  • A fix: When one feels “the burn” when confronted with new information that runs counter to our practice, recognize that this is a warning sign that knowledge may be changing.  Recognize that the sting comes from our ego, protecting what we know.  This does not mean that one should change practice whenever we come across a piece of novel information. Rather, we should we aware that in order to practice evidence based, up to date medicine, we may feel discomfort. When our beliefs are challenged, instead of becoming defensive, we should thoughtfully consider the information.
Training - Mastering a yoga pose requires training and deliberate practice. In order to unlearn ways of thinking, we must also engage in mental preparation and practice.  It is easy, particularly in emergency settings when adrenaline dominates, to think and execute in a perfunctory manner. We default to what we know and what is familiar.
Some fixes:

  • Early Exposure - The earlier we begin training, the more prepared we are. If one has an upcoming race, we may expect we will perform better if we begin preparing earlier rather than the week before the race. Similarly, when it comes to unlearning a habit or a way of thinking, the sooner we are exposed to the contrary argument, the more prepared we may be to unlearn.  This may serve as a preconditioning so that we may react less strongly upon repeat exposure. 
  • Repeat Exposure - Practice is central to most athletic endeavors. The more repetitions we do, the stronger we become.  The more we practice a yoga pose, the more likely we are to be successful, the more comfortable it will feel.  Unlearning is easier when we are exposed to the target bit of knowledge more frequently.  Spaced repetition exists as one of the most evidence-based means of learning and  this probably applies to unlearning. 
Community - Yoga and CrossFit are associated with strong communities, as are many team sports.  Communities may motivate us, hold us accountable, and push the bounds of our perceived capability.  Studies demonstrate that physicians practice similarly to the institution where they trained and show a wide array of geographic variation in practice patterns. A network of peers and colleagues, particularly outside of own’s main “system” or hospital, may increase our cognitive flexibility by exposing us to a wide array of practice pattern.  The Free Open Access Medical Education (FOAM) community may expose to novel and controversial information.

Unlearning in the Prehospital Arena: The Workout
Needle Decompression for Tension Pneumothorax (see this post or this podcast).  The second intercostal space at the midclavicular line (2nd ICS MCL) has been taught as the ideal spot for needle decompression.  This, however, is changing.  New recommendations are to use a catheter at least 8cm in length if needle decompression is attempted at the 2nd ICS MCL or decompress at the fourth or fifth intercostal space at the anterior axillary line (4/5th ICS AAL).
The chest wall is thick at the 2nd ICS MCL [1,2].  Radiographic studies of chest wall thickness demonstrate increased thickness at the 2nd ICS MCL compared with the 4/5th ICS AAL (4.78 cm vs 3.42 cm).  Even ATLS states that needle decompression in the 2nd ICS MCL will fail more than 50 percent of the time.  This is an intervention undertaken in extreme circumstances in critically ill patients.  A chance of failure of 1 in 2 is unacceptable.
The 2nd ICS MCL is difficult to identify [3,4].  The clavicle extends further than most people think. As a result, providers are less accurate in identifying the 2nd ICS MCL compared with the 4/5th ICS AAL.

The pulse check.  If one were to survey cardiac arrest resuscitation across the United States, in and out of hospital,  we would probably see that the majority of people pause every two minutes for a “pulse check” despite decreased emphasis on the pulse check by the AHA guidelines over the past 10 years.  The guidelines recommend minimal interruptions for pulse check and detail the problematic sensitivity and specificity of pulse identification [6].  After the initial pulse check prior to CPR, the guidelines don’t actually specify any time frame for repeat pulse checks. Yet, many of us do.  Sure, we can pause for rhythm analysis; however, many systems and the European guidelines now recommend pulse assessment upon observation of an organized rhythm or increase in end tidal capnography [7].
Few people can determine the presence of pulselessness in 10 seconds. Dick et al of patients placed on cardiopulmonary bypass and providers blinded to whether or not the patient actually had a pulse. Only 2% of this cohort of experienced providers were able to identify a pulseless patient in 10 seconds [8]. With increased emphasis on compression fraction, this may result in a delay in resumption of compressions.
The accuracy of the pulse identification by providers is suboptimal, noted to be 78% in one study [9].  While an accuracy of 78% may seem high, this means that approximately one in four times we will be wrong. We may feel the reverberation of our own pulse and the truly pulseless patient may have an unnecessary and perhaps deleterious delay in chest compressions.
For more on this topic check out this post and/or this post.

Left Bundle Branch Block (LBBB) as a STEMI Equivalent (check out this post)- Prior to the 2013 iteration of the AHA guidelines for ST-elevation myocardial infarction (STEMI), new or presumed new LBBB existed as a “STEMI equivalent.”  This often activated the cath lab and STEMI teams.  In 2013, the AHA removed this from the guidelines yet these patients are often referred to the emergency department for “rule out MI.”
Further, STEMI may often be diagnosed on ECG, using the Sgarbossa or modified Sgarbossa criteria (link) [10].

Backboards - fortunately protocols in many states and systems have dispensed with long backboards.  Long thought to be protective, despite known harms, the American College of Emergency Physicians released a guideline in 2016 explicitly stating that long backboards should not be used as a therapeutic or precautionary measure. They cause harm and don’t help. [11]

Oxygen in Acute Coronary Syndromes - Aspirin, oxygen, and nitroglycerin have long been the initial interventions for patients with suspected ACS. Recent studies have found no clear benefit for oxygen in patients with normal oxygen saturations. Further, one study found oxygen was associated with markers of larger myocardial infarctions (although this is not a patient-oriented outcome) [12]. The AHA recommends oxygen is appropriate for patients who are hypoxemic (oxygen saturation < 90%) [6].

1.  Laan D V., Vu TDN, Thiels CA, et al. Chest wall thickness and decompression failure: A systematic review and meta-analysis comparing anatomic locations in needle thoracostomy. Injury. 2015:14–16.
2. Advanced Trauma Life Support, 9th edition.
3. Ferrie EP et al. The right place in the right space? Awareness of site for needle thoracocentesis. Emerg Med J 2005;22(11):788–9.
4. Inaba K et al. Cadaveric comparison of the optimal site for needle decompression of tension pneumothorax by prehospital care providers
6. Berg RA, Hemphill R, Abella BS et al. Part 5: Adult Basic Life Support: 2010 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. Circulation. 122(18_suppl_3):S685-S705. 2010.
7. Resuscitation. 81(6):671-5. 2010.
8. Dick WF, Eberle B, Wisser G, Schneider T. The carotid pulse check revisited: what if there is no pulse?Crit Care Med. 2000 Nov;28(11 Suppl):N183-5
9. Tibballs J, Weeranatna C. The influence of time on the accuracy of healthcare personnel to diagnose paediatric cardiac arrest by pulse palpation.
10. O'Gara PT, Kushner FG, Ascheim DD et al. 2013 ACCF/AHA Guideline for the Management of ST-Elevation Myocardial Infarction. Journal of the American College of Cardiology. 61(4):e78-e140. 2013
11. "EMS Management of Patients with Potential Spinal Injury." ACEP Board of Directors. Available at:
12. Stub D et al. Air Versus Oxygen in ST-Segment-Elevation Myocardial Infarction. Circulation. 131(24):2143-2150. 2015.