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PEA, Pseudo EMD PEA ('Pulseless Electrical Activity') is preferred over the old term EMD = ('Electromechanical Dissociation'). PEA describes exactly what you see - = there is an electrical rhythm on the monitor but you can't feel a pulse. = The term EMD implies some weird bit of pathophysiology where the myocytes = are dissociated from or unable to respond to an electrical signal, which = is just confusing. PEA doesn't make any assumptions about physiology and = is therefore the preferred term. By sticking to the term PEA you don't = need to invoke 'meta wierdness' like 'pseudo EMD' which is merely saying = that there still is some blood flow but you can't detect it. Keep things simple, and just think of the CAUSES of PEA, ie obstructive = shock (tamponade, tension pneumothorax, massive pulmonary embolus), = profound hypovolaemia or LV rupture.