i currently work on a telemetry unit and absolutely love it, i think if you plan on working in er, you should learn your cardiology first as it will be a HUGE asset in er. i worked in er prior to telemetry and always felt overwhelmed with the acute cardiac pts, management, ecgs, iv's etc. now i am very comfortable with all of that. in er i had many neuro pt's as well, and the acute assessment and management seemed to be alot more straight forward and less intimidating in er. and the er is begging for cardiac nurses, it is a really good way to get off on the right foot. oh and cardiac pts are wonderful, they are receptive to teaching and all have a new lease on life .