 This study is a pilot, multi-centered, randomized, clinical trial to evaluate the safety and efficacy of performing early Coronary Angiography CAG versus no early CAG in post-cardiac arrest patients without ST segment elevation. Safety will be assessed by evaluating the association of major adverse events re-arrest, bleeding, pulmonary edema, hypotension, acute renal insufficiency, and pneumonia with early coronary angiogram. Efficacy will be assessed by a composite endpoint of improved left ventricular regional and global function both regional wall motion analysis and left ventricular ejection fraction as measured by echocardiography prior to hospital discharge and favourable neurological function Cerebral Performance Categories 1 or 2 at discharge. 