Ditto what Dan said about your day Buck, thankfully you and Ron knew what to do, which doesn't make you feel better, will make the widow get over a small hump later, knowing that everything that could be done, was.
Most areas have CPR and basic first aid classes through The Red Cross, and there are many individuals who give courses as well. Check with your local dentis, dental society, physician or medical society...we get mailings routinely.
The last time I looked, a portable AED was over $1000, and needs to be mounted to an electrical supply, so for many of us, it is out of consideration for our field.
CPR is something that everyone should know, and I think that all 50 states recognize its applicability with Good Sammaritan laws.
Thanks for the post and a general heads-up, though it does suck being in your shoes. Hang in there!
Greg