A lot of the cabin crew in my airline carry with them a face shield or a pocket mask for CPR, even if it's not a requirment.
We have plenty of them in the medical kits but if you have a casualty you waist a lot of time till you get it, especially in a large airplane such as 777-300. So we carry them with us for our own protection and for a rapid response. I can tell u that it's not very nice to give CPR to somebody that vomited before.
We also have a defib on board of all the airplanes and the senior cabin crew are trained to use it.
I think basic CPR at least should be known by all the cabin crew and the airliners (even the low cost) should provide a lot of face shields and rubber gloves to the cabin crew. It's very basic stuff.