What is Sudden Cardiac Arrest? Sudden heart attack (SCA) just implies that the heart unexpectedly & suddenly stops pounding. This is generally brought on by an abnormal heart rhythm called ventricular fibrillation (VF). Is SCA the same as a cardiac arrest? No. A heart attack is a problem in which the blood supply to the heart muscle mass is suddenly obstructed, resulting in the fatality of the heart muscle. Cardiac arrest victims typically (however not constantly) experience breast pain and generally stay aware. Cardiovascular disease is serious and in some cases will result in SCA. However, SCA might take place individually from cardiovascular disease and without alerting signs. SCA results in fatality if not dealt with right away.