How to Recognize Cardiac Arrest vs Other Emergencies

When someone suddenly collapses, every second matters. But not every emergency is the same—and knowing the difference between cardiac arrest and other conditions can determine the right response.

Here's how to recognize cardiac arrest quickly—and what to do next.

What Is Cardiac Arrest?

Cardiac arrest happens when the heart suddenly stops beating effectively. Blood flow to the brain and vital organs stops immediately.

Without fast action, it becomes fatal within minutes.

Key Signs of Cardiac Arrest

Look for these three signs:

Unresponsiveness

• The person does not wake up when you tap or shout

• No reaction at all

Not Breathing (or Only Gasping)

• No normal breathing

• Occasional gasping (agonal breaths) — this is NOT normal breathing

No Signs of Circulation

• No movement

• No coughing

• No normal breathing

If all three are present, assume cardiac arrest and act immediately.

Cardiac Arrest vs Other Emergencies

Heart Attack

• Person is usually awake and breathing

• May have chest pain, pressure, sweating, nausea

• Still responsive

Action: Call 911, monitor, and be ready for CPR if they collapse.

Stroke

• Person is awake but confused

• One-sided weakness, slurred speech, facial droop

• Breathing is usually normal

Action: Call 911 immediately (FAST: Face, Arms, Speech, Time).

Choking

• Person may be conscious but unable to speak or breathe

• Hands at throat, signs of distress

Action: Perform abdominal thrusts (or back blows for infants).

Fainting (Syncope)

• Brief loss of consciousness

• Person usually resumes normal breathing quickly

Action: Monitor and assess.

Overdose / Respiratory Emergency

• Breathing may be slow, shallow, or absent

• Person may be unresponsive

Action: Call 911, give naloxone if available, begin CPR if no breathing.

Why This Matters

Cardiac arrest means the heart has stopped and CPR is required immediately.

Most other emergencies mean the heart is still beating and require different care.

The danger is hesitation:

• Waiting too long

• Mistaking gasping for breathing

• Assuming the person will recover without help

When in Doubt, Act

If the person is unresponsive and not breathing normally, start CPR.

You cannot make the situation worse by acting—but delaying can be fatal.

What to Do for Suspected Cardiac Arrest

1. Call 911 immediately (or have someone else call)

2. Start chest compressions (push hard and fast in the center of the chest)

3. Use an AED as soon as possible

4. Continue until help arrives

Train Before You Need It

CPR Safety 411 offers hands-on CPR and AED training to help you recognize emergencies and respond with confidence. Whether you need BLS certification for a healthcare-adjacent role or want to build your team's readiness through first aid training, we have options for individuals and organizations across Pennsylvania. Ready to get started? Request a CPR class today.