Why YSK: TV has lied to you. If a cardiac arrest happens and you have an AED defibrillator at hand you might still need to do chest compressions.
- When you open up the AED there will be instructions on how to apply the electrodes as well as any other procedure needed to get started.
- The machine will first analyze the heart’s rhythm to find out if a shock can restore the heart.
- If the machine doesn’t find anything it will instruct you to perform CPR. After a while it will then instruct you to stand by as it does another analysis.
- It will once again either deliver a shock or instruct you to go back to CPR. Do this routine indefinitely until medical services has arrived. You will be tired. Switch out with another person if there are other people who can help.
- Some AED’s are automatic and will warn you to stand back and deliver a shock. Others will need you to press a button to deliver the shock yourself. Make sure not to touch the person as the machine delivers the shock.
The other thing they don’t say during cpr class is that the resuscitation rate for an out of hospital cardiac arrest is 9.1%.
One of the biggest factors in survivability is the time to initiate CPR in the time the compressions are interrupted. My EMS department has moved away from a AHA to high performance CPR. 
What is an AHA and what is high performance CPR?