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Heart attack. Cardiac arrest. People often use these terms interchangeably, but they are not the same. One is a circulation problem. The other is an electrical failure. Both are medical emergencies, but only one requires a defibrillator.
In this article, we’ll explain the difference between a heart attack and sudden cardiac arrest, including the symptoms, causes, and what to do in each case. This knowledge could help you respond faster and even save a life.
A heart attack, also known as a myocardial infarction, occurs when blood flow to the heart is blocked, typically due to a clot in one of the coronary arteries.
Chest pain or pressure
Pain radiating to the arm, jaw, back, or neck
Nausea or vomiting
Shortness of breath
Cold sweat
Dizziness or fatigue
People experiencing a heart attack are usually conscious and responsive, and symptoms can build gradually.
đź“– According to the NHS, early treatment improves outcomes significantly.
Sudden Cardiac Arrest (SCA) happens when the heart suddenly stops beating due to an electrical malfunction. Blood flow to the brain and other vital organs stops almost immediately.
Collapse with no warning
No pulse or breathing
Loss of consciousness
No response to shouting or touch
Without intervention, cardiac arrest is fatal within minutes. An AED (Automated External Defibrillator) and CPR are the only effective treatments.
⏱️ Every minute without defibrillation reduces survival chances by 10%. This is why accessible AEDs are critical.
| Feature | Heart Attack | Cardiac Arrest |
|---|---|---|
| Cause | Blocked blood flow | Electrical disruption |
| Conscious? | Usually conscious | Always unconscious |
| Breathing? | Often still breathing | Not breathing or gasping |
| Primary Treatment | Medication, surgery | CPR + AED |
| Requires a defibrillator? | Not immediately | Yes – urgently |
How AEDs Help During Cardiac Arrest
AEDs are designed to be used by anyone, even without training. They:
Analyse the heart rhythm
Deliver a shock if needed
Guide the user step-by-step with voice and visual prompts
If cardiac arrest is suspected, an AED should be used as soon as possible. Browse our most popular devices like the:
ViVest PowerBeat X1 AED – now with child mode
ViVest PowerBeat X3 AED – suitable for high-traffic areas
Call 999
Help the person sit down and stay calm
Offer 300mg aspirin (if not allergic)
Monitor for changes
Call 999
Start chest compressions immediately
Use an AED as soon as possible
Continue CPR until help arrives
Need CPR or AED training? Book a certified course with us and give your staff the skills to act confidently in a real emergency.
Heart attacks and cardiac arrests are both serious, but only one requires immediate defibrillation. Understanding the difference can be the deciding factor between life and death.
For businesses, schools, and public spaces, having a defibrillator on-site is essential. Explore our full range of AEDs and storage solutions to get fully equipped.
Q1: Can a heart attack lead to cardiac arrest?
Yes. A heart attack can trigger a cardiac arrest, especially if it severely disrupts heart rhythm.
Q2: Do I need a defibrillator for a heart attack?
Not usually. AEDs are for cardiac arrest. A heart attack is treated with medication and urgent medical care.
Q3: How do I know if someone is in cardiac arrest?
They’ll be unresponsive, not breathing normally, and have no pulse. Start CPR and use an AED immediately.
Q4: Is it safe to use an AED without training?
Yes. AEDs are designed for untrained users and will not deliver a shock unless needed.
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