Call 911 and then follow the instructions of the operator who is trained in teaching CPR over the phone in these situations, and knows the latest. That you had training means you are more likely to understand instructions given ,and if not you were following directions of someone else.
You need to call 911 anyway. CPR is only performed on dead people, you need an AED (or similar tools in an ambulance) to bring someone back to life.
Calling 911 is the right way to go. Activating emergency response system. And if you don’t make sure someone else does and tells you they have. So many times people assume someone else called and no one has.
There was a push at one point in time to teach bystander CPR, which focuses on compressions at a rate of 100-120 a minute with a little less focus on landmarks and more “middle of the chest and go”. It also taught that people typically have about 20 minutes of reserve oxygen in their venous system and that compressions continuously increased survivability by keeping the circulation going through compressions. Considering average ems response time in the US, it seemed to reduce confusion and encouraged more community response (not wanting to do mouth to mouth is a fear people have). Not sure if it’s still being taught, but it was fairly well received at the time.
The ‘single rescuer’ CPR is still taught, and (one) standard says that if the rescuer doesn’t want to give breaths by mouth, compressions alone are better than nothing. Giving breaths is still better. Once you have two rescuers, one better be giving breaths. I wish more places had the mouth masks placed with their AEDs. I carry mine around with me, but who the hell actually does that?
Call 911 yes, but if you have training, tell them to stfu and let you do it. They try to have you count out loud with them, but the delay over the phone makes you go off rhythm constantly. I threw the phone across the room when I was giving CPR to my dad. He didn’t make it, and I often wonder if it was because of the shitty beginning of the CPR regimen.