I can only speak about my personal experience and it's been pretty atypical in regard to our facility. It may or may not represent the telemetry world at-large.
1) I don't know that you'll face the "why" question -- that seems to happen in <30% of interviews in my experience. That said, I strongly discourage people from looking at any position as simply a stepping stone from which they're looking to leave ASAP.
The reasons for that discouragement include:
- you sometimes burn your bridges
- it can look really bad on a resume
- it can sour the environment for those who come behind you
- most significantly - it can leave you bitter and resentful if you're not able to "get out" as quickly as you'd expected.
That said, we all need to get a start somewhere and our career ambitions frequently change as we become experienced.
It's really a matter of perspective, I suppose, but I suggest the attitude of "this is the job I'm after and I'm going to throw myself into it full-tilt and not worry about what comes next until this role has run its course."
To the question of "why," I'd consider responses along the lines of:
- I'm really interested in cardiac nursing because...
- Telemetry patients often have so much else going on that I feel like it will be a great learning experience and a role in which I can grow for a long time...
- I've heard such great things about ___ hospital...
- There's a lot that goes into the decision but it includes my very strong desire to live in...
2) The telemetry nurses are not the ones watching the monitor; that's generally the role of the telemetry tech. The nurses are the ones doing the direct patient care (assessment, wound care, meds, ADL assist), rounding with the docs, and charting.
3) Beginning today, I'd start busting my butt to learn as much about EKGs, rhythm strips, cardiac conditions, and cardiac meds as I could. That knowledge could make/break you in an interview.
4) No reason to wait on your ACLS cert... I'm sure many of your competitors already have it.