Heart Attack vs Cardiac Arrest: What Is the Difference and How to Respond (2026)

By SKLD Training - 2026-02-25

A heart attack and a cardiac arrest are not the same thing - and the wrong response can cost a life. This guide explains the key differences, warning signs for each, the correct first aid actions, and how a heart attack can lead to cardiac arrest if not managed quickly.

Why Knowing the Difference Could Save a Life

When someone collapses at work or shows signs of a serious cardiac event, the actions taken in the next few minutes determine whether they survive. But one of the most common mistakes bystanders make is treating a heart attack and a cardiac arrest as the same emergency - they are not. Each requires a different immediate response, and confusing the two can delay the right treatment at the worst possible moment.

In simple terms: a heart attack is a circulation problem - a blockage prevents blood from reaching part of the heart. A cardiac arrest is an electrical problem - the heart stops beating altogether. The person having a heart attack is usually conscious and breathing. The person in cardiac arrest is not.

This guide explains both conditions clearly, covers the correct first aid response for each, and explains how a heart attack can quickly escalate into cardiac arrest if it is not managed properly.

Learn how to respond to cardiac emergencies: SKLD Training - CPR and first aid courses on the Gold Coast

Heart Attack vs Cardiac Arrest: The Key Differences

The distinction between these two events is one of the most important things first aid training teaches. Here is a direct comparison:

Feature	Heart Attack	Cardiac Arrest
What is happening	A blocked coronary artery is cutting blood flow to part of the heart muscle	The heart has stopped pumping effectively - no circulation of blood or oxygen
Type of problem	Plumbing problem (circulation)	Electrical problem (heart rhythm)
Consciousness	Usually conscious and alert	Unconscious - unresponsive
Breathing	Usually breathing normally	Not breathing normally (may have agonal gasps)
Pulse	Usually present	No pulse
Onset	Often gradual, symptoms build over minutes or hours	Sudden - person collapses without warning
Immediate action	Call 000, sit them down, give aspirin if no allergy, monitor closely	Call 000, start CPR immediately, use AED as soon as available
CPR needed?	Not immediately - but be ready if they deteriorate	Yes - start CPR immediately

Recognising a Heart Attack: Signs and Symptoms

Heart attacks can present differently in different people. The classic presentation is chest pain, but many people - particularly women and older adults - experience subtler symptoms. In an Australian workplace context, recognising these signs early can prevent a heart attack from escalating into a full cardiac arrest.

Common warning signs of a heart attack include:

Chest pain or tightness: often described as pressure, squeezing, heaviness, or a burning sensation. May be central or left-sided.
Pain radiating to the arm, jaw, neck, or back: particularly the left arm and jaw, though right-sided radiation also occurs.
Shortness of breath: even without chest pain, difficulty breathing can indicate cardiac stress.
Nausea or vomiting: a less obvious symptom that is frequently reported, especially in women.
Sweating: sudden cold sweats or clammy skin without obvious cause.
Dizziness or light-headedness: feeling faint or unsteady.
Extreme fatigue: unusual tiredness that may precede a heart attack by hours or days.
Anxiety: a sense of impending doom is commonly reported by heart attack survivors.

Importantly, symptoms may come and go. A person may dismiss them as indigestion or muscle strain. If there is any suspicion of a cardiac event, treat it seriously and call 000 without delay.

Recognising Cardiac Arrest: What It Looks Like

Cardiac arrest is unmistakable once you know what to look for. The person will:

Collapse suddenly - often without warning or preceding symptoms.
Be unresponsive - will not react to voice or touch.
Not be breathing normally - may have occasional gasping breaths (agonal breathing), which should not be confused with normal breathing.
Have no detectable pulse - though lay rescuers are not expected to check for a pulse; instead, the absence of normal breathing in an unresponsive person is the trigger to act.
Have grey, blue, or ashen skin - particularly around the lips and fingertips, due to lack of oxygenated blood circulation.

Every second without CPR and defibrillation reduces the chance of survival by approximately 7 to 10 percent. There is no time to hesitate - if a person is unresponsive and not breathing normally, assume cardiac arrest and act immediately.

First Aid Response Comparison: Heart Attack vs Cardiac Arrest

The response to each condition is distinct. Following the wrong protocol wastes critical time and may cause harm. This comparison table and the steps below cover the correct approach for each:

Step	Heart Attack Response	Cardiac Arrest Response
1. Assess the scene	Ensure safety, approach calmly	Ensure safety, approach quickly
2. Check responsiveness	Person is conscious and responsive	Person is unconscious and unresponsive
3. Call 000	Call 000 immediately - do not wait to see if symptoms improve	Call 000 immediately or direct someone else to call while you start CPR
4. Position	Sit the person down in a comfortable position - do not let them walk around	Lay the person flat on their back on a firm surface
5. Aspirin	Give 300mg aspirin (chewed, not swallowed whole) if available and they have no known allergy and are not already on blood thinners	Not applicable - focus on CPR and AED
6. CPR	Do not start CPR yet - monitor and be ready to start if they become unresponsive	Start CPR immediately: 30 chest compressions then 2 rescue breaths. Push hard and fast - at least 5cm deep, 100 to 120 compressions per minute
7. AED	Not required yet - but know where your workplace AED is located	Apply AED as soon as it is available. Turn it on and follow the voice prompts
8. Monitor	Stay with the person. Keep them calm and still. If they become unresponsive or stop breathing, begin cardiac arrest response immediately	Continue CPR until: paramedics arrive, the person starts breathing normally, or you are physically unable to continue

Get trained to respond to both emergencies: Book HLTAID011 Provide First Aid or HLTAID009 CPR with SKLD Training

How a Heart Attack Can Trigger Cardiac Arrest

One of the most critical facts in cardiac emergency response is this: a heart attack can cause a cardiac arrest. This is why heart attack first aid always includes staying with the person and being ready to escalate to CPR.

Here is how the progression happens:

Blockage reduces blood flow: the coronary artery blockage starves a section of heart muscle of oxygen.
Muscle damage occurs: if the blockage is not cleared quickly, heart muscle cells begin to die (this is a myocardial infarction).
Electrical instability develops: damaged heart muscle can disrupt the heart's electrical system, causing dangerous arrhythmias such as ventricular fibrillation (VF) or ventricular tachycardia (VT).
Ventricular fibrillation begins: in VF, the heart's lower chambers quiver chaotically instead of pumping. There is no effective heartbeat. This is cardiac arrest.
Circulation stops: without effective pumping, oxygenated blood stops reaching the brain and vital organs. Unconsciousness follows within seconds.

The window between heart attack onset and cardiac arrest can be minutes - or it can be hours. This is why calling 000 immediately at the first sign of a heart attack, and never leaving the person alone, are non-negotiable steps. A first aider who recognises the transition from heart attack to cardiac arrest and begins CPR immediately gives the person their best chance of survival before paramedics arrive.

Risk Factors and the Australian Workplace

Cardiac emergencies do not occur only in hospitals or aged care facilities. They happen in offices, on construction sites, in warehouses, in hospitality venues, and on sports fields. Understanding the risk profile of your workplace matters.

Common risk factors for heart attack and cardiac arrest relevant to Gold Coast and broader Australian workplaces include:

Age: risk increases significantly for men over 45 and women over 55. Many workplaces have significant proportions of workers in these age groups.
Physically demanding work: construction, landscaping, warehousing, and trades involve exertion that can trigger cardiac events in people with underlying coronary artery disease.
Heat exposure: the Gold Coast's subtropical climate creates elevated cardiovascular stress, particularly for outdoor workers. Heat increases the demand on the heart and can precipitate events in vulnerable individuals.
High-stress roles: chronic workplace stress is a recognised risk factor for cardiovascular disease.
Sedentary office roles: prolonged sitting is associated with increased cardiovascular risk.
Lifestyle factors: smoking, high blood pressure, diabetes, obesity, and high cholesterol are prevalent in the working-age population.
Previous cardiac history: workers with known cardiac conditions are at significantly elevated risk.

The QLD First Aid in the Workplace Code of Practice requires employers to assess their first aid needs based on the nature of their work and workforce. In any workplace where these risk factors are present, having trained first aiders and an accessible AED is a practical obligation, not just a box-ticking exercise.

Suburbs across the Gold Coast with significant industrial and workplace activity - including Coomera, Helensvale, Robina, Southport, Burleigh Heads, and Surfers Paradise - all have workplaces where cardiac emergency preparedness should be a priority.

ANZCOR Guidelines: What First Aid Training Teaches

All first aid training delivered by SKLD Training follows the guidelines set by the Australian and New Zealand Committee on Resuscitation (ANZCOR), the peak body responsible for resuscitation guidelines in Australia. ANZCOR guidelines are reviewed and updated regularly to reflect the latest evidence in cardiac emergency response.

Key ANZCOR guidance for lay responders covers:

DRSABCD action plan: Danger, Response, Send for help, Airway, Breathing, CPR, Defibrillation - the structured approach taught in all Australian first aid courses.
Compression-only CPR: ANZCOR recognises that lay rescuers who are unwilling or unable to deliver rescue breaths should still perform continuous chest compressions. Compression-only CPR is far better than no CPR.
Early defibrillation: ANZCOR strongly emphasises applying an AED as quickly as possible. Time to first shock is the most important modifiable factor in cardiac arrest survival.
Aspirin in suspected heart attack: ANZCOR supports giving aspirin to conscious adults with suspected heart attack in the absence of contraindications.

HLTAID009 Provide CPR and HLTAID011 Provide First Aid both align with ANZCOR guidelines. Participants practise on manikins, operate an AED trainer, and work through scenario-based assessments that build genuine response confidence. (HLTAID011 - training.gov.au) (HLTAID009 - training.gov.au)

Which Course Covers Cardiac Emergency Response?

Both of SKLD Training's core courses cover the content you need to respond to a heart attack or cardiac arrest:

Course	Unit Code	What It Covers	Best For	Renewal
Provide CPR	HLTAID009	CPR technique, AED use, DRSABCD, cardiac arrest response	Annual CPR renewal, anyone wanting core cardiac arrest skills	Annually
Provide First Aid	HLTAID011	Everything in HLTAID009 plus heart attack recognition, full first aid scope including medical emergencies	Most workplaces, general first aid compliance, broader medical emergency coverage	3 years (CPR component annually)

For anyone who wants to respond confidently to both a heart attack and a cardiac arrest, HLTAID011 Provide First Aid provides the most complete preparation. The course covers recognition of medical emergencies, correct first aid actions, and hands-on CPR and AED practice. HLTAID009 is the right choice for those completing their annual CPR renewal who already hold a current first aid certificate.

Frequently Asked Questions

What is the difference between a heart attack and cardiac arrest?

A heart attack occurs when a blocked coronary artery cuts blood flow to part of the heart muscle. The person is usually conscious, breathing, and in pain. A cardiac arrest occurs when the heart stops beating effectively due to an abnormal electrical rhythm. The person is unconscious and not breathing normally. A heart attack is a circulation problem; cardiac arrest is an electrical problem. The correct first aid response is different for each.

Can a heart attack cause cardiac arrest?

Yes - this is one of the most important links between the two conditions. A heart attack can cause dangerous heart rhythm disturbances (particularly ventricular fibrillation) as a result of oxygen-starved muscle becoming electrically unstable. This is why calling 000 immediately and never leaving a heart attack victim alone are critical steps: a first aider present at the transition can begin CPR before the person's chances of survival collapse.

What should you do if someone has a heart attack at work?

Call 000 immediately. Sit the person down and keep them calm - do not let them walk around. If they have no known allergy to aspirin and are not on blood thinners, give them 300mg of aspirin to chew (not swallow whole). Stay with them, monitor their condition closely, and be ready to begin CPR if they become unresponsive or stop breathing normally. Know where your workplace AED is located before an emergency occurs.

Do you perform CPR for a heart attack?

Not initially - CPR is for cardiac arrest, not for a heart attack in progress. A person having a heart attack is conscious and breathing, so CPR is not appropriate and could cause harm. However, a heart attack can rapidly deteriorate into cardiac arrest. If the person becomes unresponsive and stops breathing normally, begin CPR immediately. The transition from heart attack to cardiac arrest is the exact moment when trained first aiders make the difference between survival and death.

What are the warning signs of cardiac arrest?

The person will suddenly collapse and become unresponsive - they will not respond to voice or touch. They will not be breathing normally (occasional gasping or agonal breaths are not normal breathing). Their skin may become grey, blue, or ashen. Unlike a heart attack, there may be no preceding warning symptoms. Cardiac arrest can also occur in people who appear perfectly healthy. If you find someone unresponsive and not breathing normally, treat it as cardiac arrest and act immediately.

Can you survive cardiac arrest without CPR?

Survival from cardiac arrest without CPR is extremely unlikely. Without chest compressions, the brain and vital organs receive no oxygenated blood. Brain damage begins within 4 to 6 minutes of cardiac arrest; death follows shortly after without intervention. CPR does not restart the heart - it keeps blood circulating until a defibrillator can be applied or paramedics arrive. Even imperfect CPR is far better than none. Bystander CPR can double or triple survival rates from out-of-hospital cardiac arrest. Book a CPR course with SKLD Training to build the skill and the confidence to act.

Training and assessment delivered on behalf of Allens Training Pty Ltd RTO 90909.