If you suspect a heart attack, the first move is to call EMS and get an AED on scene

Suspect a heart attack? The top priority is to call EMS right away and get an AED on site. This rapid response allows professional assessment and potential defibrillation. While awaiting responders, keep the person calm and follow EMS guidance; aspirin may be used if advised, but do not delay emergency help.

When something as serious as a heart attack is happening, time isn’t just money—it’s minutes, perhaps seconds, that can change a life. You don’t need to be a medical professional to make a difference in those crucial moments. The key is to act calmly, decisively, and with a clear plan. In Level C first aid terms, the first action you take when you suspect a heart attack is to call for emergency help and get an automated external defibrillator (AED) on the scene as quickly as possible.

Let me explain why that moment matters. A heart attack occurs when blood flow to part of the heart is blocked, usually by a clot. The heart muscle starts to suffer from a shortage of oxygen. If that deprivation continues, the rhythm can deteriorate into a dangerous pattern, and cardiac arrest may follow. In those moments, outside help becomes part of the treatment—the sooner help arrives, the better the chances of survival. An AED can deliver a life-saving shock if the person’s heart rhythm becomes shockable. The device is designed to be used by bystanders with minimal training, and it talks you through the steps. Still, the critical first move is summoning professional responders and bringing the AED to the scene.

What does “calling EMS” look like in practice? It means dialing the local emergency number immediately and clearly stating: “I think this person is having a heart attack.” Give the exact location, whether the person is conscious, and any signs you’re seeing—chest pain, shortness of breath, fainting, pale skin, or sweating. While you’re on the line, you can start to prepare for care, but don’t delay getting help. If you’re in a place with a public AED, let responders know and have the device retrieved. The idea is to get professional help en route, and to have the AED ready when the responders arrive or when the person collapses.

Now, what about the other steps you might hear about, like giving aspirin or assisting with prescribed medications? These actions aren’t irrelevant; they’re part of the broader care picture. But they should never take the place of calling for help. Here’s a practical way to think about it: call first, then assess what you can safely do while help is on the way. If the person has chest pain and is not allergic to aspirin, and you’re confident there are no stomach ulcers or active bleeding issues, you may offer a chewable aspirin—usually one 325 mg tablet or two 81 mg tablets, unless the person already takes a different regimen. But do not delay the emergency call to administer aspirin. The aim is to get professional treatment started as quickly as possible, while you manage symptoms and keep the person comfortable.

If the person has prescribed medications (for example, nitroglycerin, as directed by a clinician), you should not administer them yourself unless you are trained and the instructions are explicit for you to do so, and you have been told by the person or their caregiver exactly how to proceed. The risk of improper use is real, especially with drugs that affect blood pressure. In practice, this means you can offer to locate the medication and help the person take it if you’re sure of the dosing and if the EMS operator confirms it’s appropriate to do so. And again, don’t let this step supersede the priority of calling EMS and fetching the AED.

Between calling for help and the arrival of professional responders, there are other tips that can help you stay grounded and supportive. First, try to keep the person calm and seated or lying down in a comfortable position, with legs bent if that helps them breathe more easily. A loosened collar, relaxed posture, and a reassuring tone can do more than you might expect. Stress can worsen chest discomfort, so speak in a calm, supportive voice, acknowledge what they’re feeling, and avoid arguing or giving a running commentary on how scary everything looks. It’s natural to feel a bit unsettled in the moment, but a steady presence can be the difference between panic and a measured response.

If the person becomes unresponsive or stops breathing normally, you’ll need to start CPR and use the AED as soon as it’s available. In Level C training, you learn the basic steps: for adults, confirm unresponsiveness, shout for help, call EMS, and begin chest compressions at a rate of about 100 to 120 per minute with a depth of at least 2 inches (5 cm). If you’re trained in providing rescue breaths, you can add them after every 30 compressions, but if you’re not comfortable or you don’t have a barrier device, continuous chest compressions alone are still highly valuable. When the AED arrives, turn it on, follow the spoken prompts, and let the machine guide you through analyzing the heart rhythm and delivering a shock if advised. It’s a bit clinical to think of it that way, but the device helps you time the rhythm and act at the optimal moment.

Let’s take a moment to connect this to a broader reality: the environment matters. Public spaces that have AEDs nearby, like airports, malls, schools, and large office buildings, make a tangible difference in outcomes. If you carry a portable AED as part of workplace safety planning, you’re not overreacting—you’re being practical. The key is not to panic at the sight of a device; it’s to recognize that time is a resource, and you’re helping conserve it. A quick check to note where the AED is, how to access it, and the route EMS will take once they arrive can shave precious seconds off the response.

Some people worry about the “what ifs” in the moment. What if the person doesn’t want help? What if they’re allergic to aspirin? What if the ambulance takes too long? Here’s the honest answer: you can help without being a hero, and you should prioritize actions that preserve life. If the person objects to medical help or medication, you still proceed with respect and care, and you keep the line to EMS open. You can offer comfort, keep their airway clear, and monitor their condition. If you need to pause to fetch the aspirin, do so only if it won’t delay the EMS call or the arrival of the AED.

A practical note on rhythm: heart attack signs aren’t always uniform. Some people experience crushing chest pain; others feel indigestion-like discomfort, shortness of breath, dizziness, or even a feeling of impending doom. Women and men can present differently, which is why responsiveness matters more than a checklist. If you notice symptoms that suggest a heart attack—especially in someone with risk factors like age, smoking, high blood pressure, or a history of heart disease—treat it as an emergency. Don’t wait to see if the pain passes. The clock is ticking when the chest tightens.

Let’s talk about the why behind the sequence. EMS teams are trained to perform rapid assessment, monitor vital signs, and prepare for advanced care en route to the hospital. They can administer life-saving medications, provide oxygen, and coordinate with hospital teams for immediate care. The AED’s role is equally crucial. Defibrillation, when indicated, can restore a normal rhythm and buy time for circulation to resume. The synergy between early EMS activation and the AED is a proven improvement in survival rates, and it’s exactly why the first action is so strongly recommended.

If you’re someone who wants to internalize this for real-life readiness, consider a few practical habits that don’t demand special gear or a dramatic shift in your daily routine. Keep a small reminder in your bag or car: a card with the emergency number, your city’s steps for requesting an ambulance, and the location of any AEDs near you. Practice the sequence in your head: call, fetch, check, start, shock. It’s simple, but it sticks. And if you ever attend a first aid class, you’ll find that hands-on practice with a manikin is invaluable. The more you rehearse, the less tangled the moment becomes when it actually happens.

A quick shift to the science-y side, for those who crave the why. Aspirin helps by inhibiting platelets, which can contribute to clot formation in a heart attack. But it’s not a cure; it’s a tiny, helpful flag waved in the right direction, a signal to the body’s own repair crew that a block needs attention. Nitroglycerin, when prescribed, relaxes blood vessels and eases the workload on the heart—but again, it’s context-dependent. All of these tools exist within a larger system of care. The initiating act—the call for help and the arrival of the AED—remains the anchor.

In the end, the takeaway is simple, even if the situation isn’t. Suspecting a heart attack isn’t a moment to second-guess or improvise from scratch. It’s a time to prioritize speed, clarity, and safety. Call EMS immediately. Get an AED on the scene. If you’re able, offer aspirin and assist with prescribed medications, but never at the cost of delaying professional help. Calmly guide the person, keep them comfortable, and be ready to start CPR if the scenario changes. Your actions won’t just describe a rescue story—they could write a life-saving chapter.

A few closing thoughts to keep in mind. Heart attacks don’t always announce themselves with fireworks. They arrive quietly, or sometimes they arrive with a sudden jolt of pressure that grabs your attention. When you’re in a situation that calls for Level C know-how, it’s not about having all the answers. It’s about knowing which actions matter most and acting with intention. It’s about recognizing the urgency, staying steady, and letting the rhythm of the right steps guide you.

If you’re ever curious about where to find an AED or how to verify your local EMS protocols, start with your community health department or the safety officer at your workplace or school. Many places now publish clear guides on where to locate devices and how to engage with emergency services effectively. It’s the small, practical knowledge that pays off when the moment arrives—the difference between hesitation and a decisive, life-affirming response.

So, next time the topic comes up, you’ll have a grounded, human-centered understanding: the first action in a suspected heart attack is to call EMS and get an AED on site. The rest is important, but it’s the timing of that first step that often determines the outcome. And that’s something worth remembering, not just as a rule, but as a reminder that in emergencies, being prepared isn’t overkill—it’s care in action.