Cardiac Arrest vs. Heart Attack graphic:
CARDIAC ARREST occurs when the heart malfunctions and stops beating unexpectedly. Cardiac arrest is an "ELECTRICAL" problem.
A HEART ATTACK occurs when blood flow to the heart is blocked. A heart attack is a “CIRCULATION” problem. A blocked artery prevents oxygen-rich blood from reaching a section of the heart. If the blocked artery is not reopened quickly, the part of the heart normally nourished by that artery begins to die.
copyright American Heart Association