“…However, a number of studies suggest that transthoracic and transesophageal echocardiography have potential utility in diagnosing treatable causes of cardiac arrest such as cardiac tamponade, pulmonary embolism, ischemia, and aortic dissection. [223][224][225][226][227] In addition, 3 prospective studies 228 -230 found that absence of cardiac motion on sonography during resuscitation of patients in cardiac arrest was highly predictive of inability to achieve ROSC: of the 341 patients from the 3 studies, 218 had no detectable cardiac activity and only 2 of these had ROSC (no data on survival-to-hospital discharge were reported). Transthoracic or transesophageal echocardiography may be considered to diagnose treatable causes of cardiac arrest and guide treatment decisions (Class IIb, LOE C).…”