This is the second study from the REASON group - one of the most rigorously performed studies of ultrasound in cardiac arrest. In this article, they are looking at the population in pulseless electrical activity (PEA) with cardiac motion on ultrasound. From this group, they differentiate those with organized rhythms. The idea is that perhaps this population would have a different survival or respond to treatments differently. By reanalyzing their previous data, they are able to answer these questions.