AP Style Update - heart attack
AP has added a stylebook entry differentiating among heart attack, heart failure and cardiac arrest.
Heart attack (myocardial infarction) -- Blockage of one or more arteries supplying blood to the heart.
Heart failure -- Chronic condition when a weakened heart can no longer effectively pump blood.
Cardiac arrest, or sudden cardiac arrest -- The heart suddenly stops beating. It can be due to a heart attack or rhythm problem, or as a result of electrocution or other trauma.