This is one sexy pilot study about norepinephrine in cardiogenic shock. The authors here decided to take a look at norepinephrine (NE) versus epinephrine in patients with cardiogenic shock s/p MI. They didn’t use dopamine as they had noted an article that I have reference here where I discussed how dopamine actually increases mortality in cardiogenic shock compared to NE.
The rationale why the authors went to NE was because data has shown that the myocardium may have a more favorable effect on myocardial O2 consumption. Epi was believed to cause more deleterious effects. Ultimately, though, none of this had been proven in a trial. Well, here is the trial.
Over the course of 5 years they included 57 patients. See why I have such respect for these folks who do trials? I have no idea where I am going to be in 5 weeks, let alone 5 years. They measures a ton of parameters and did their statistical jumping jacks that I will not bore you with (but the article is entirely free for those curious minds out there).
Ultimately, what we are about is how the patients did. With regards to their MAP, CI, and SVI, they were the same. As one would expect, the HR for the patients on epi was higher. Also expected, as epi hits more of the beta receptors, there was an increase in lactate in these patients (which doesn’t mean they need more fluids).
There was an early termination of the study, though, as 37% of the patients on epi went into refractory shock while just 7% of the patients on NE did the same (p=0.008). The authors acknowledge that it is a small trial but they were able to see a clear difference between the two groups. There are numerous other limitations to the study as well that they acknowledged. When your patients are in cardiogenic shock, how do you all use your vasopressors/inotropes?
Also, I am working on a comprehensive vasopressor post HERE.
Levy BC, Clere-Jehl R, Legras A, et al. Epinephrine versus norepinephrine in cardiogenic shock after acute myocardial infarction. J Am Coll Cardiol. 2018;72:173–82.
Link to Abstract
Link to FULL FREE Article
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