I am an MPH person with a question about cardiac arrest. So, this is basically a lay person with a little bit of a health background asking. Also, this question is not related to a specific incident, it is more of a general question. So, if a person arrives in an emergency room in cardiac arrest are blood tests for cardiac enzymes and an ECG routinely done? Or, is this only done when an MI is suspected? Are the medical staff more concerned with basic life support during a cardiac arrest than determining if it is an MI or not? So, would an ECG and blood tests not necessarily be done in such a case? I guess the real question is, in what cases are an ECG and blood tests performed and in which cases are they not performed? Thanks for any help!