If you asked me about mechanical CPR in the ED a year ago, I would have said, “why would I want another tool cluttering my resus bay that hasn’t been shown to improve outcomes? Well, we recently got a Lucas CPR compression system in our ED, and its arrival has coincided with a great post by Dr Salim Rezaie on cognitive offloading (using physical action to alter the information processing requirements of a task to reduce cognitive demand) during cardiac arrest. So I’ve decided to put a discussion of the two together, since I think there is no better way to frame the argument for using one than Dr Razaie’s post.
Within the choreography of a resuscitation, multiple critical actions need to occur, but which ones? Each action we take is a calculated choice. With finite time and cognitive bandwidth, every action we say yes to is also concomitantly a no to others. Small changes in the choices we make to achieve our goals during a resuscitation have the potential to significantly impact the quality of our cardiac arrest care.
That’s why I love posts like Salim Rezaie’s on cognitive offloading during a cardiac arrest. He’s taken the time to deconstruct a standard ACLS approach with the goal of reducing our cognitive burden to give us a better chance at rapidly transitioning to the important task of defining the problem behind the cardiac arrest.
We all know the H’s & T’s and the importance of reviewing potentially reversible causes of cardiac arrest. It’s also no mystery that the faster you can get to thinking about them, the faster you can make lifesaving decisions about care. But if the basic requirements of the ACLS algorithm keep you incessantly occupied by a multitude of details that demand your full attention (monitoring for quality CPR, issues with IV access, repeated medication dosing, time wasted on prolonged pulse checks) then how realistic is it in the real world of cardiac resuscitation to expect you are going to have enough time to find the cause and reverse the problem?
And what if you’re working in a resource poor environment with too few hands, or you have a patient with difficult access, or is 400 pounds and requires herculean strength to maintain high quality CPR? Well then, you may never get there at all – or at the very least your arrival may be significantly delayed.
Finding a better pathway to that cognitive space is Salim’s goal. His solution? Leverage the concept of cognitive offloading to get you there faster by rethinking the basic tasks required for optimal perfusion during CPR so you have more time to think. To me this makes a lot of sense.
A rapid sequence review of recommendations for cognitive offloading during a cardiac arrest
Now on to the Lucas – With Dr Jim Horowitz
Which brings us to mechanical CPR. It turns out that about the same time Salim posted we were getting familiar with our new Lucas device. It’s benefit is not simply replacing the physical work of CPR with a machine, but reducing the cognitive work needed to ensure your team maintains high quality chest compressions throughout a prolonged resuscitation: watching for provider fatigue, calling for new CPR providers, ensuring the right depth, rate, and quality of compressions, and directing the CPR providers throughout a code are all tasks that distract a team leader.
For Jim (our VTE and ECMO expert and my favorite cardiologist to have at the bedside during an arrest) the benefits of offloading CPR are obvious: it means more time to initiate ECMO. And as he mentions in the video, mechanical CPR tends to make codes quieter, and makes placing lines and intubation easier during active CPR. This is significant offloading in action and can reduce distractions or delays in getting to that all important cognitive space.
I wish I’d had the Lucas 2 in some of the rural hospitals I’ve worked in, where it was often me and one nurse on an overnight, and I had to grab the clerk to help with CPR. I was lucky if I could get a LMA and an IO in quickly enough to take my turn doing CPR.
Cognitive offloading is something most good Emergency Physicians do intuitively to get through their day, but the concept was never explicitly taught to me during my training. I vote that it should become a core content lecture for every residency program in the country.
More to come.
Thanks to Dr Jim Horowitz for coming and demonstrating the Lucas 2 device to our residents and faculty. You can also download his iBook manual for the Lucas 2 for free here.
(None of us have any conflicts of interest with this device).