I’m a doctor (a baby, junior, junior one, but still, a doctor), and I’m currently doing 3 months of cardiology, which means (joy of joys) I’m on the cardiac arrest team.
Although there are pocket masks everywhere around the hospital and it is highly unlikely that I would ever be more than a few feet from one (especially since I carry one one on my keyring), were I ever to find myself needing to do CPR without one, I’d just do chest compressions until someone arrived with the proper equipment.
It was emphasised to everyone at ALS training that whether or not one chooses to do mouth-to-mouth is a personal choice, and that if you choose not to do it for reasons of your own health and safety, that is perfectly acceptable. You do whatever else you can until proper help and equipment arrives but you don’t put yourself at risk for the 15% chance that you can successfully resuscitate your patient (and that’s in a hospital). There are documented cases of TB, SARS and Hepatitis B and C infections from unprotected CPR. The risks are not theoretical, and in case your only experience of a resuscitation is ER or * House* there’s usually vomit and possibly blood involved.
Before ABC comes SS:
Shouting for help
Scene and personal safety
Shaking the person gently
Deciding whether or not to do mouth-to-mouth comes under Scene and Personal safety- before you even check for a pulse.
COR consists of opening the airway, performing chest compressions, and ventilation…even if you aren’t ventilating you should still be doing everything else.