No matter how good an app is, it is no replacement for keeping up with your skills and protocols. If you need an app to provide adequate patient care, you need to refresh your skills or find a new job. Imagine the patients seeing you take out your phone to find out how to care for them. Maybe this app would be useful to review while off duty or between calls, but if I was the patient, I'd be as nervous as I was when I saw the pilot of a small plane reading its manual before taking off.
Just my $0.02 - didn't mean to single you out for asking for some advice.