Heart Attack, Cardiac Arrest, Stroke: What Do the Terms Actually Mean?
News stories, obituaries, and everyday conversation routinely swap the terms heart attack, cardiac arrest, and stroke as if they were interchangeable. They name three different events. This page sorts out the vocabulary — what each term refers to, and the related terms that cluster around each one. It is a glossary, not a guide to recognizing or responding to any of these events; all three are 911 emergencies, and the organizations linked below are the right place for response and training information.
Heart attack: a blood-supply problem
A heart attack — the medical term is myocardial infarction — happens when blood flow to part of the heart muscle itself is blocked, and that section of muscle is damaged from lack of oxygen. The heart is a muscle with its own dedicated blood supply, the coronary arteries, and the disease process that narrows them over time is called coronary heart disease (or coronary artery disease). The NHLBI's coronary heart disease reference explains that underlying process in plain language. The key concept: in a heart attack, the heart is typically still beating — the problem is plumbing.
Cardiac arrest: an electrical problem
Cardiac arrest means the heart has stopped beating effectively — its electrical system has failed and it can no longer pump blood. It is not a synonym for heart attack, though a heart attack can trigger one. This distinction is why you'll see two different kinds of resources: heart-attack material is about a disease of blood supply, while cardiac-arrest material centers on emergency response — CPR and defibrillators (AEDs). If the terminology has made you curious about that side, CPR training is a real, learnable skill; the American Heart Association is the standard-setting body for CPR education in the US and its site is where to find courses and related topics.
Stroke: the brain's version of the same problems
A stroke is an interruption of blood supply to part of the brain. The American Stroke Association's stroke reference describes the two main types the term covers:
- Ischemic stroke — a blockage cuts off blood flow to brain tissue. This is the more common type.
- Hemorrhagic stroke — a blood vessel in or around the brain ruptures and bleeds.
You will also encounter TIA, for transient ischemic attack, sometimes casually called a "mini-stroke" — a temporary blockage. The word transient refers to the interruption being temporary; clinicians treat the term seriously, and the plain-language MedlinePlus stroke overview is a good vetted source on how the terminology fits together, along with diagnosis and rehabilitation concepts like stroke rehab teams.
Why the confusion persists
All three events involve the cardiovascular system, all three are emergencies, and headlines often compress them into "heart episode" or use whichever term is shortest. There is also a real umbrella term: cardiovascular disease (CVD) legitimately covers disorders of the heart and blood vessels as a group, including both heart disease and stroke. So a sentence like "cardiovascular disease is the leading cause of death worldwide" — a finding reported by the World Health Organization — is correct precisely because it bundles these conditions together. The bundling is fine in statistics; it just shouldn't leak into describing an individual event.
The honest bottom line
Knowing this vocabulary helps you read health information accurately and follow conversations with clinicians. It does not equip you to assess an emergency. If you want that capability, it exists — through CPR and first-aid courses taught by certified instructors — and if you're facing an actual emergency, the only correct move is calling 911.