I agree with Crux1024, I was a little torn about what I wanted to do when I was first filling out college apps and then I shadowed my aunt who is an RN and just knew that that was what I wanted to do. It helps to be exposed to the different fields so...
DM= diabetes mellitus OM= otitis media, osteomyelitis, or obtuse marginal artery if you're somewhere in the CCU... but it's more likely that it's one of the first two! CVA= cerebrovascular accident, or stroke Good luck! :)