05/14/2026
Whatâs the Difference Between a Heart Attack and Cardiac Arrest?
One of the biggest misconceptions I see in CPR classes is people thinking heart attack and cardiac arrest are the same emergency.
They arenât.
Knowing the difference can change how quickly someone gets the right help.
People mix these up all the time, but medically, they are very different emergencies.
A heart attack is a circulation problem.
Blood flow to part of the heart muscle becomes blocked, usually from a clot.
A cardiac arrest is an electrical problem.
The heart suddenly stops pumping blood effectively.
A person having a heart attack is usually:
awake
breathing
talking
complaining of chest pain, pressure, heaviness, jaw pain, arm pain, nausea, sweating, or shortness of breath
A person in cardiac arrest is:
unconscious
not breathing normally
may have agonal gasping
needs CPR immediately
And hereâs the important part: A heart attack can absolutely turn into cardiac arrest.
Thatâs why chest pain should never be brushed off.
If someone is having symptoms of a heart attack:
call 911 immediately
keep them calm
have them sit and rest
If they are conscious, not allergic, and not actively bleeding, aspirin may be appropriate because it helps reduce clotting. Many EMS systems and hospitals recommend chewing regular-strength or baby aspirin during suspected heart attack symptoms if medically appropriate.
If the patient has prescribed nitroglycerin, they may take it exactly as prescribed.
Important: Never give someone elseâs nitroglycerin. Never take extra doses trying to âpush throughâ severe symptoms.
And this is a huge one: Do not drive yourself to the hospital with chest pain.
Call an ambulance.
EMS can:
monitor the heart rhythm
start oxygen if needed
give medications
recognize cardiac arrest immediately if it happens
alert the hospital before arrival
Minutes matter during heart emergencies. Early treatment saves heart muscle, and sometimes, saves the person entirely.