Getting to the Point of Ultrasonography in Cardiac Arrest

We enjoyed the recent article by Hu et al.1 This study addresses a common question encountered by emergency physicians. Although we are concerned that the disparate definitions of "cardiac activity" provided to the audience before testing may have increased, by priming, the level of observed disagreement, the article highlights an important concept: what appears to be a basic and readily answered question is actually quite nuanced. Thus, our belief is that dichotomous interpretation of bedside ultrasonography in the setting of cardiac arrest (ie, cardiac standstill: yes or no?) is an oversimplification of an inordinately complex process.

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