Sudden Cardiac Arrest vs. Heart Attack: What's the Difference?

People often use the terms heart attack and sudden cardiac arrest as if they mean the same thing. They do not. Both are emergencies, but they happen for different reasons and they look very different from the outside. Knowing which one you are seeing helps you respond the right way, and in these moments minutes matter. The care team at Highpoint Health in Middle Tennessee wants patients and families to feel prepared.

What Is the Difference?

A heart attack is a circulation problem. A blocked artery cuts off blood flow to part of the heart muscle, and that muscle starts to suffer damage. The heart usually keeps beating. The person is usually awake and able to talk, even though they feel terrible.

Sudden cardiac arrest is an electrical problem. The heart's rhythm suddenly fails and the heart stops pumping blood. The person collapses within seconds, stops responding, and stops breathing normally.

The two are connected. A heart attack can trigger sudden cardiac arrest, which is one reason chest pain should never be ignored or waited out at home.

What Are the Warning Signs of a Heart Attack?

Heart attack symptoms often build slowly over minutes or hours. They can be mild, and they can come and go, which is why so many people talk themselves out of calling for help. Common signs include:

• Chest pressure, tightness, squeezing, or pain that lasts more than a few minutes
• Discomfort that spreads to the arm, shoulder, back, neck, jaw, or upper stomach
• Shortness of breath, with or without chest discomfort
• Cold sweat, nausea, or sudden lightheadedness
• Unusual fatigue or a strong sense that something is wrong

Do Symptoms Look the Same for Everyone?

No. Women, older adults, and people with diabetes are more likely to have a heart attack without the classic crushing chest pain. Unexplained fatigue, jaw or back discomfort, nausea, and shortness of breath may be the only clues. Quieter symptoms deserve the same urgency as dramatic ones.

What Are the Warning Signs of Sudden Cardiac Arrest?

Sudden cardiac arrest arrives without a long buildup, and the signs are hard to miss:

• Sudden collapse
• No response to shouting, shaking, or touch
• No breathing, or only gasping sounds
• No pulse

What Should You Do in the First Few Minutes?

Call 911 first in both situations. Paramedics can start treatment on the way and alert the hospital before you arrive.

Bystander CPR can double or triple the chance of survival. You do not have to be perfect. Doing something is far better than doing nothing.

If you suspect a heart attack: help the person sit down, loosen tight clothing, and stay with them. Do not drive yourself, and do not let them drive. The 911 dispatcher may tell you to have them chew an aspirin.

If someone collapses and is not breathing normally: start hands-only CPR right away. Push hard and fast in the center of the chest, about twice per second, and keep going until help arrives.

If an AED is nearby, send someone to get it. Turn it on and follow the spoken instructions. The device will not deliver a shock unless one is needed.

When Should You Go to the Emergency Room?

If you are unsure whether symptoms are serious, treat them as serious. Care begins sooner in an ambulance than in a private vehicle, and the emergency team at Highpoint Health can start testing the moment you arrive. Waiting to see whether discomfort passes on its own is the most common and most costly mistake people make.

Have questions about your heart or your family history? Talk with a provider at Highpoint Health in Middle Tennessee.