Saturday, 24 August 2019

Decreased facial expression variability in patients with serious cardiopulmonary disease in the emergency care setting



Could “normal affect variation” be a new physical examination finding that predicts severity of illness?

Dr Jeff Kline thinks it might be. He’s the preeminent PE researcher who brought us the PERC rule. He has conducted this pilot study that suggests we might be on to something.

This was a prospective study of a convenience sample of patients presenting to the ED with dyspnea and chest pain. 50 patients looked at 3 stimulus slides on a laptop computer that recorded their facial expressions. Did their faces move when viewing the slides?

Two independent blinded observers reviewed the recordings and scored the change in facial expression using a coding system. The main analysis compared the results of the score to the patient’s presence of disease (predefined yes/no serious cardiopulmonary disease.)

How well did the change in facial expression perform?

It seemed to be ok.

The expression of surprise had the largest difference between yes/no disease with an area under the receiver operating curve (AUC) of 0.75. But given the low numbers, the confidence intervals were rather wide (95% CI 0.52 to 0.87).

Perhaps the biggest limitation to the study beyond the small numbers was the gold standard. How do we quantify “how sick” someone is? The authors acknowledge several patients did not meet their predefined determination of “serious cardiopulmonary disease” but were likely sick due to other pathology.

To be fair, Dr Kline points out that we consciously or unconsciously use affect variation as part of our gestalt assessment anyway. How many times have you heard an experienced clinician say, “the patient just looks sick…” But this study is a step towards standardisation and/or quantification of this implicit process.

Could artificial intelligence be the next step… perhaps. Dr Kline co-founded the company BreathQuant Medical Systems Inc that has many patents for medical devices. Perhaps we’ll have “affect variationometer” soon.


Covering:

Kline JA, Neumann D, Huang MA, et al. Decreased facial expression variability in patients with serious cardiopulmonary disease in the emergency care setting. Emerg Med J 2015;32:3-8. [link to article]




Femoral Nerve Catheters Improve Home Disposition and Pain in Hip Fractures... maybe



There has been a push to perform nerve blocks for femoral neck fractures. Typically, these are single injections with a long acting anaesthetic. But continuous infusions through a femoral nerve catheter may supply better and longer lasting analgesia. Perhaps this could decrease complications from parenteral medications, allow for earlier mobilisation and get patients home faster?

This group from Stanford retrospectively reviewed health records of all geriatric hip fractures during a 4-hour period. About halfway through this time, this hospital started a hip fracture protocol that involved insertion of an ultrasound guided indwelling continuous female nerve catheter (CFNC).

They compared the before group that got standard analgesia vs. the CFNC. They sought to answer three questions; do CFNC improve home disposition rates, do they decrease pain scores & narcotic consumption, and does it decrease opioid-related side effects.  

Results?

43% of the patients getting CFNC were discharged home compared to 7% of the standard group. In addition, the patients with nerve catheters had lower pain scores, less opioids, and less side effects.

Sounds great!

But unfortunately, there are some big limitations.

They only included 29 patients. (I find it hard to believe that this was “all” patients with fractures at Stanford over 4 years… selection bias?) So, 43% vs. 7% is really 6 vs. 1 patient. This is hardly strong evidence.

Chart reviews are always problematic, and it does not look like this one followed the usually recommended methods. Of course, patients were not randomised. As such, there may have been some further selection bias.

I also wonder if the new protocol introduced other aspects of care that led to improvements. Perhaps this is why the “after” group looked better.

Nevertheless, I think the idea of femoral nerve catheters is quite compelling. Hopefully we can get further data to inform our practice.  


Covering:

Arsoy D, Huddleston JI, Amanatullah DF, et al. Femoral Nerve Catheters Improve Home Disposition and Pain in Hip Fractures Treated with Total Hip Arthroplasty. J Arthro 2017;32:3434-3437. [link to full text]


Friday, 23 August 2019

Behavioral Changes in Children After ED Procedural Sedation


Image result for dumb and dumber
It is unusual to see such an awful paper published in a reasonably respected journal. This addition to the medical literature has only made us dumber.

The purpose of this study was to determine the proportion of children undergoing procedural sedation for fracture reduction in the ED that have negative behaviours afterwards. With this information, the authors claim that we could possibly improve things by treating the child’s anxiety prior to sedation. (But this aspect was not studied).

This was a prospective cohort study of a convenience sample of kids getting IV ketamine for reduction of (mostly) broken arms. The child’s anxiety was measured on a scale prior to the procedure. Negative behaviours were measured by parents on another scale 1-2 weeks after discharge. There was no control or comparator group.

82 patients were analysed. 33 kids were “highly anxious” before sedation and 18 had negative behaviours after ED discharge.

The authors clearly imply that the procedural sedation itself was causal to the negative behaviours.

Hmmm…

What about the traumatic event that caused the fracture, the pain from the injury, the wait to be seen by a doctor in a chaotic ED, the visible worry of the parents, the disruption to sleep, play, and activity from injury & plaster. Could they have potentially caused some anxiety afterward?

Evidently not… it must have been the ketamine from the procedural sedation.

This paper is shameful.

It is VERY likely the ketamine was protective of negative behaviours and changing this would have resulted in worse outcomes. When used correctly, ketamine is a wonderful drug for procedural sedation. It is incredibly safe, provides pain relief, amnesia and excellent conditions for procedures.


Covering:

Pearce Ji, Brousseau DC, Yan K, et al. Behavioral Changes in Children After Emergency Department Procedural Sedation. Acad Emerg Med 2019;25:267-274. [link to article]


C-MAC vs Direct Laryngoscopy for Rapid Sequence Intubation in the ED


Prior studies have clearly proven a video laryngoscopes (VL) generally provide a better view of the chords. But does this translate into improved first pass success rates of intubation?

This study tried to determine which is ultimately better; a C-MAC or old fashion direct laryngoscopy (DL)? This is probably a decent research question.

150 ED patients undergoing RSI in a single ED in Zurich were randomised to either C-MAC vs. DL.  

For "ethical reasons" they excluded patients that they thought would be difficult to intubate. The primary outcome measure was first pass success rate. It was powered to find a 14% difference between the groups.

Unfortunately, all intubations were performed by one of three “very experienced” anaesthetic consultants.

Can you guess the first pass success rate for “very experienced” anaesthetists for simple intubations?

Yes, you guessed it… 100% in both groups. (Well, just about.)

This study was never going to find a difference and I wonder why they went to so much effort in the first place. Seems like it was always going to be a waste of time.

We already know that video laryngoscopes are taking over. But what do you do when the scope fails, unavailable, or needs rescue?

Learn both.


Covering

Sulser S, Ubmann D, Schlaepfer, et al. C-MAC videolaryngoscope compared with direct laryngoscopy for rapid sequence intubation in an emergency department. Eur J Anaesthesiol 2016;33:1-6. [link to article]



Saturday, 29 June 2019

Buddy taping vs. Plaster for Neck of 5th Metacarpal (Boxer’s) Fractures


I love saving time in the ED. Much of this can come from avoiding procedures that don’t provide benefit to the patient.

Should we dump plaster casting for Boxer’s fractures?

This was an RCT from Queensland, Australia. Evidently, they do a lot of punching in Queensland.

They included patients between 18-70 years old, simple closed fractures without rotation and an angulation of less than 70 degrees. Yes, you read that correctly, they tolerated up to 70 degrees.

126 patients were randomised to buddy taping or plaster cast immobilisation.

The primary outcome was hand function at 12 weeks using the quickDASHquestionnaire. They also looked at pain, satisfaction, return to work or sport, and quality of life.

As expected with this cohort of patients, there were quite a few lost to follow up and 97 patients underwent intention to treat analysis.

Results?

At twelve weeks, both groups were the same on the quickDASH questionnaire. Those randomised to buddy taping returned to work earlier than those in the plaster group. Other measures were also similar. Ultimate fracture angle at follow up was similar at about 30 degrees.

The authors conclude, “we advocate a minimal intervention such as buddy taping for uncomplicated boxer’s fractures.”

However, there were several limitations to this study. It was not blinded which could have introduced bias. The study design should have really been a non-inferiority trial.

But there may have been a bigger issue.

The quality of the conclusion is only as good as the validity of the primary outcome measure. I’m not convinced that the quickDASH questionnaire is robust enough to reliably measure the big picture. In addition, capture of data may not have been the most discerning; thus pushing the conclusions towards the null hypothesis.

In the end, our referring doctors (ortho, plastics, or hand specialists) are going to dictate their preferences to us. Given the overall quality of the evidence, I don’t have a problem doing what they like.

My local hand specialists have asked us to continue with plaster immobilisation. They feel you can get a better reduction using the Jahss technique, have less initial pain, less narcotic use and possibly require less operative reduction. Of course, this is an eminence-based recommendation. If I moved to Queensland, I will probably be buddy taping... and watching my back. 


Covering:

Pellatt R, Fomin I, Pienaar C, et al. Is Buddy Taping as Effective as Plaster Immobilization for Adults With an Uncomplicated Neck of Fifth Metacarpal Fracture? A Randomized Controlled Trial. Ann Emergency Med. 2019; 74:22-97. [link to article]

Early vs. Delayed Cardioversion in Recent onset of Atrial Fibrillation


We know from prior studies that acute atrial fibrillation will frequently spontaneously revert. So, when patients arrive to the ED, which is better? Immediate cardioversion or a “wait-and-see" approach.

To attempt to answer this question, these Dutch investigators conducted a multicentre randomised noninferiority trial. They enrolled stable patients with recent onset (less than 36 hours) to early cardioversion vs. wait-and-see.

The wait-and-see approach involved giving rate control medications and eventual cardioversion if the AF was not resolved by 48 hours.  

The primary endpoint was the presence of sinus rhythm at 4 weeks. However, there were other important secondary measures they captured such as rate of spontaneous resolution, resource utilisation, recurrence of AF, safety etc.

Results?

By 4 weeks both groups were about the same and within their prespecified non-inferiority margin. Sinus rhythm was present in 91% of the delayed group vs. 94%.

So, it doesn’t matter?

Perhaps it does… In the delayed group, the rate of spontaneous resolution was 70%! This begs the question, why do we bother with such an early aggressive approach to AF when it very often spontaneously resolves.  Can we limit the potential harms of antiarrhythmic medications and procedural sedations and let nature take its course?

These findings are consistent with prior researchDoyle B et al. Heck, I may not ever get published in the NEJM but at least I have been referenced! 

What do I do?

This is the time for shared decision making. Pull up a chair and have a chat to the patient.  It also depends on how symptomatic the patient is, their prior experiences, rates of recurrence, and dare I say, a busy department.

Quick… don’t just do something, stand there!


Covering:

Pluymaekers N, Crazy Dutch Name, Dudink J, Luermans J, et al. Early or Delayed Cardioversion in Recent-Onset of Atrial Fibrillation. N Engl J Med 2019;380:1499-1508. [link to article]


Thrombolysis guided by perfusion imaging up to 9 hours after onset of stroke: how fragile can we be?


The biggest, baddest controversy in Emergency Medicine just got worse.

Yes, it’s stroke lysis.

This multicentre RCT enrolled adult patients in whom alteplase or placebo could be given between 4.5 to 9 hours after onset of stroke or on awakening with stroke symptoms. A prerequisite for inclusion was a perfusion deficit (area of ischemic but not infarcted brain) on CT or MRI.

The primary outcome was a score of 0-1 on a modified Rankin scale (mRS) adjusted for age and baseline severity of stroke. Of course, they looked at many secondary outcomes including the classic ordinal shift analysis and some safety measures.

They estimated a sample size of 400 patients would be needed in order to have 80% to detect a difference of 15% in the primary outcome.

Recruitment was slow going. They only enrolled 225 patients over 8 years in in 28 centres! That’s about one patient per centre per year! Yikes. No wonder they called it quits early. They claimed the WAKE-UP trial published in May 2018 caused them to lose clinical equipoise and they terminated early. I think they probably had enough anyway…

Results?

40 (35%) patients in the alteplase group were mRS 0-1 vs. 33 (29.5%) in the placebo group (adjusted risk ratio, 1.44 95% confidence interval 1.01 to 2.06; P=0.04). Symptomatic ICH was 6% vs. 1%.

Thrombolysis is a winner!??!!

Unfortunately, it is not so clear.

There was no statistical difference in the primary outcome when they used their originally proposed logistic regression modelling rather than a different method introduced during recruitment. The unadjusted analysis; no difference. There was no difference in the ordinal shift analysis (which ironically was touted as the saviour of IST-3). But most of all, the results are just plain fragile.

Fragile?

The fragility index was less than one. Put another way, if one less patient in the alteplase group did not meet the primary outcome, the trial would have been negative. This seems far from a definitive trial.

The authors claim that “further trials of thrombolysis in this time window are required.” This seems rather contradictory when they claim to have stopped their trial due to lack of clinical equipoise.

What to think?

If I was calling the shots, I would not extend my window. But at the same time, others may interpret this study differently. 

However, much of this might be a storm in a teacup. The vast majority of patients in this window derive neither harm nor benefit from thrombolysis (NNT 17 if you believe the results). In addition, clot retrieval is all the rage now.  


Covering:

Ma H, Campbell BCV, Parsons MW, et al. Thrombolysis Guided by Perfusion Imaging up to 9 Hours after Onset of Stroke. N Eng J Med 2019;380:1795-803.[link to article]