3. To conduct pragmatic clinical trials of the integrated post cardiac arrest protocol versus historical controls, and study related patient outcomes such as survival to hospital discharge. We will also look to provide a comprehensive assessment of in-hospital complications, the incidence of presumed myocardial ischemic events causing cardiac arrest, and to assess the causes of in-hospital and post discharge morbidity and mortality for the one year following discharge, as a function of the presumed underlying cause of cardiac arrest and the in-hospital course.