To haifagirl,
Actually, I would be amazed at how many. In my small shul, I’m the only one that knows anything about medicine and first aid. It probably varies greatly from shul to shul and neighboorhood to neighboorhood. Btw, just because you are a doc doesn’t mean you are up on CPR and other emergency measures. A guy could be a Psychiatrist and never have to deal with emergencies in his office. A layman who is trained would do a better job than this guy -in a cardiac arrest.