The most critical is call 911 (or if you are in a hospital or care facility, follow your protocols). You aren't going to save them alone. Next would be deep rapid compressions. Keep that blood moving and oxygen to the brain. There are many aspects to CPR that are critical, these are the most critical in my opinion.
Edit: As always, keep yourself safe. That should be first. :)
what is the preferred method for performing 1-rescuer CPR on a child
It is possible to get an infectious disease from performing CPR. The risk is low, but there is a risk. That is why the ARC and AHA advise the use of a breathing barrier when performing CPR (even during class practice on the mannequin).
when performing the 'head tilt, chin lift' you are opening the casualties airways;allowing for effective rescue breaths when performing CPR.
The EMT performing CPR on the patient saved his life.
CPR ratio is 30 compressions to 2 breaths.
Activate your emergency response system after performing CPR for 1 minute.
You can't get into any legal trouble for performing CPR on a person
It is possible to get sick by performing CPR on someone, especially when doing rescue breaths. Hands-only CPR is an alternative which involves chest compressions which reduces that risk. Also, if someone has been dead for hours, performing CPR on them would be pointless.
You should have an AED / CPR card so your knowledge of the AED use and performing CPR is at an adequate level. But, it isn't required.
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In CPR, "DOTS" is an acronym used to help responders remember the steps to assess a victim for injuries. It stands for Deformities, Open wounds, Tenderness, and Swelling. This assessment helps identify potential injuries that may require urgent attention before or during performing CPR. It's a quick way to evaluate the victim's condition and prioritize care.