Cardiac arrest is heart stop beating (e.g. damar Hamlin? The Bills dude the other year). This is when you see a flatline.
Heart attack or myocardial infarction means the arteries that keep your heart oxygenated get blocked, cardiac tissue after the blockage of that then starts dying. The heart is still beating (or trying to beat).
Have you already been drinking? Champagne is the drink, Champaign is a town in Illinois.