Heart Emergencies Explained: Heart Attack, Cardiac Arrest & Heart Failure Although These terms sound similar, heart attack, cardiac arrest, and heart failure are three separate heart-related conditions with different causes and treatments. Knowing how these conditions differ can be life-saving, as timely action plays a critical role in outcomes. At https://www.diigo.com/item/note/b2kov/s9a7?k=df49752baa5b50bf79516f8b735140db