Sudden cardiac arrest at work is not a rare, distant event: it happens in offices, warehouses, schools, and break rooms, often to someone who looked healthy that morning. Survival depends largely on what coworkers do in the first few minutes, before an ambulance can arrive. This article explains what cardiac arrest is, what an effective workplace response looks like, and how employers can prepare so that the people in the room are ready to act.
Cardiac Arrest vs. Heart Attack: Why the Difference Matters on the Job
The two terms are used interchangeably, but they describe different problems. A heart attack is a circulation problem: a blocked artery starves part of the heart muscle of blood. The person is usually awake and may have chest pain, shortness of breath, nausea, or pain spreading to the arm or jaw. Sudden cardiac arrest is an electrical problem: the heart's rhythm becomes chaotic or stops, so the heart quivers instead of pumping. Within seconds the person collapses, becomes unresponsive, and has no normal breathing or effective pulse.
The two can be linked, since a heart attack can trigger cardiac arrest. But a person having a heart attack is typically talking to you, while a person in cardiac arrest is not.
Gasping is not breathing
One of the most dangerous misconceptions is that a person who is still making noise must be breathing. In the first minutes of cardiac arrest, many people produce agonal breathing: slow, irregular gasps, snoring sounds, or brief twitching. This is a reflex of a brain starved of oxygen, not effective breathing. Coworkers who see it often decide the person is "still breathing" and wait. Treat gasping in an unresponsive person as a sign of cardiac arrest.
How the distinction changes your response
A conscious person with suspected heart attack symptoms needs a 911 call and rest while you wait. An unresponsive person who is not breathing normally needs 911, chest compressions, and an AED immediately. Waiting to see whether the person recovers costs the minutes that matter most.
Cardiac arrest is also not limited to older adults or people with known heart disease. The American Heart Association (AHA) reports that tens of thousands of cardiac arrests occur outside hospitals in the United States each year, and they can affect working-age adults with no prior diagnosis. Check the AHA's most recent statistics at heart.org before quoting exact figures in your own materials.
What a Workplace Cardiac Arrest Looks Like in the First Minutes
Imagine a mid-shift moment on a warehouse floor. A forklift operator climbs down, takes a few steps, and drops to the concrete. A coworker taps his shoulder and shouts his name. Nothing. His chest is not rising normally, though he makes a occasional snorting gasp. The same scene could happen at a desk, where a colleague slumps in a chair, or in a break room, where someone falls mid-sentence. In each case the signs are the same: no response and no normal breathing.
Why the first minutes decide the outcome
Without CPR and defibrillation, the chance of survival drops with every passing minute. The AHA has long taught that survival falls substantially for each minute defibrillation is delayed, and that prompt CPR can improve the odds. Confirm the exact current figure on the AHA's website before citing it, because the numbers are refined as new data is published.
Emergency medical services (EMS) response times vary with distance, traffic, weather, and whether your site is rural or urban. Even a fast response is measured in minutes, and a large campus or multi-floor building can add more time just getting a crew to the patient. For the early minutes, coworkers are the first responders and sometimes the only ones.
Hesitation is normal, but it can be addressed
Many people freeze because they fear hurting the person or being blamed afterward. Consider the first worry: a person in cardiac arrest is not going to survive without help, so the risk of doing nothing outweighs the risk of a cracked rib, which is a known and treatable consequence of effective compressions. On the legal side, Good Samaritan protections exist in every state but differ in wording and scope. Check the current statute for your state, or ask your employer's counsel, rather than relying on a general assurance.
The Response Chain: Steps Coworkers Should Take Right Away
Speed comes from a simple sequence everyone already knows. Based on current AHA guidance for adults (confirm against the latest AHA guidelines when you build training materials), the chain looks like this:
- Check for response and breathing. Tap the person's shoulders, shout, and look at the chest for no more than about 10 seconds. If they do not respond and are not breathing normally, treat it as cardiac arrest.
- Call 911 or direct someone to. Put the call on speaker so the dispatcher can coach you while your hands stay free.
- Start CPR. Begin chest compressions right away. Hands-only CPR, compressions without rescue breaths, is appropriate for untrained bystanders. Trained rescuers can add breaths in a 30 compressions to 2 breaths cycle.
- Send someone for the AED. Have it brought to the scene and turned on as soon as it arrives.
Compression technique
Place the heel of one hand on the center of the chest, on the lower half of the breastbone, with the other hand on top. Push straight down hard and fast at a rate of 100 to 120 compressions per minute, about 2 inches deep for an adult, and let the chest fully rise between compressions. Incomplete recoil reduces the blood the heart can refill with. Do not pause longer than necessary.
Name the person you are asking
"Someone call 911" often results in everyone assuming someone else did. Point and be specific: "You in the blue jacket, call 911 and tell them we're at the north entrance. You, get the AED by the front desk." Named roles remove the pause.
When to stop
Continue until EMS takes over, the person starts to move or breathe normally, or an AED instructs you otherwise. Compressions are tiring, and quality drops quickly. If others are available, swap compressors about every two minutes, ideally during the AED's rhythm check, so the pause is short.
AEDs in the Workplace: Where They Belong and How They Work
An automated external defibrillator (AED) is a portable device that analyzes the heart's rhythm through two adhesive pads and delivers a shock only if the rhythm calls for one. It cannot shock a healthy heart by accident, which settles a common worry: using an AED on someone who does not need a shock is not possible, because the device will not advise one. Clear voice prompts, and often visual cues, walk an untrained person through each step: turn it on, apply the pads, stand clear, and press the shock button if instructed.
Placement
An AED is only useful if it can be reached quickly. Good placement follows a few principles:
- Mount it in a visible, central location with clear signage, such as near an entrance, cafeteria, or main corridor.
- Keep it unlocked, or if it must be in a cabinet, make sure the cabinet is clearly marked and not alarmed in a way that causes hesitation.
- Aim for a retrieval time of a few minutes or less from any work area, including round trip.
- On multi-floor buildings, consider a device per floor. On large sites, such as plants or distribution centers, map walking distances and add devices where gaps exist.
Maintenance
An AED that fails because of a dead battery is worse than no plan at all. Assign one named person and a backup, and use a checklist:
- Monthly visual check that the status indicator shows ready.
- Expiration dates on pads and battery recorded and tracked, with replacements ordered ahead of time.
- Spare pads stored with the device where appropriate.
- A written log of each inspection.
Check the rules that apply to you
AED requirements differ by state and by building type, and some states mandate devices in certain facilities such as schools or health clubs. As of 2026, confirm the current state and local requirements for your site. For federal workplace guidance, review OSHA's materials on first aid and AEDs at osha.gov, and verify they are current before you base policy on them.
Building a Workplace Readiness Plan
Equipment and good intentions are not a plan. Readiness comes from four pieces working together: trained people, a written process, practice, and a culture where people feel able to act.
Match training to roles
- Healthcare staff: Basic Life Support (BLS) certification, which covers team-based resuscitation, rescue breaths, and bag-mask use.
- General employees: CPR and AED certification, so that as many people as possible can start compressions and operate the device.
- Supervisors and safety leads: First aid in addition to CPR and AED, since they often manage the scene and the aftermath.
Midwest CPR Center offers CPR, AED, First Aid, and BLS courses, and can help match formats to your team's schedules and needs, including group training for employers.
Write the emergency action plan
Put the steps in writing and keep them short. List the response chain, post AED locations on floor plans, and name who calls, who retrieves the AED, and who meets EMS. Include a call-routing note: the exact street address, building or entrance to use, and any gate codes or elevator access, so 911 dispatchers and crews are not searching a large site. Designate someone to wait at the entrance and guide them in.
Practice and refresh
Skills fade. Short scenario walkthroughs a few times a year, even ten minutes at a team meeting, keep the sequence familiar: where is the AED, who calls, who starts compressions. Align formal refresher training with the certification cycle. CPR and BLS certifications are typically valid for two years, but confirm the period with the issuing organization.
Confidence is part of readiness
Team-based training helps coworkers see each other as capable responders and makes it more likely someone steps forward. The goal is simple: when an emergency happens, nobody is deciding whether to act.
After the Emergency: Support for the Patient and the Team
When EMS arrives, the handoff matters. Tell the crew what you saw, when the person collapsed, how long CPR was performed, and whether an AED delivered a shock. If someone noted the time, share it. Then step back and let the professionals work.
Take care of the equipment
Do not return the AED to its cabinet as is. Many devices store rhythm and shock data that EMS or the manufacturer can retrieve, so follow your device's instructions and local protocol. Replace used pads, check the battery, restock gloves, a face shield, and a towel or razor if you keep them, and confirm the status indicator shows ready before it goes back into service.
Look after the people who responded
Witnessing a collapse is distressing, and performing CPR can be harder emotionally than people expect, whatever the outcome. Hold a brief, voluntary debrief soon afterward, offer access to your employee assistance program or other counseling resources, and make clear that shock, sleeplessness, guilt, or tearfulness are normal reactions. Check in again a few days later.
Review without blame
Within a couple of weeks, walk through what happened. Did the AED arrive quickly? Was the address clear to dispatchers? Did anyone hesitate, and why? Use the answers to update the emergency action plan, training schedule, and device placement. The aim is to improve the system, not to judge the individuals who acted under pressure.
Prepared Coworkers Are the Best Chance Someone Has
When sudden cardiac arrest at work occurs, quick CPR and early AED use by people who know what to do give a colleague the best chance of surviving. Equipment, a written plan, and regular practice all matter, but they only work when people are trained to use them.
Don't wait until an emergency happens. Equip yourself and your team with life-saving skills today. Schedule your CPR certification class now and gain the confidence to respond when every second counts. Midwest CPR Center offers CPR, AED, First Aid, and BLS training for individuals, employers, and healthcare teams.