I'm not seeing that this would be a major issue with any company. Realistically, how many interviews would you expect? Say 10? That's what many companies give off for vacation time the first year if you're looking corporate/business type jobs, I'd bet hospitals would be the same. If the interviews don't pan out as well as expected and you end up with, say, 4, would it make sense to have selected a job that presumably is not as good in some way as other positions only because it offered interview flexibility, that in that case you didn't even need?
I'd go with the "best" job for you, however that's defined. There is no requirement that you tell your employer that you will be going to med school next year, it would be more ethical to do so if you had a med school offer in hand that you had accepted, but as a reapplicant with aspirations to be accepted next year, I can't see any problem with applying for the position without mentioning the chance that you'll be resigning in a year.
Another way to look at this, if you're uncomfortable with thinking about it this way, is will the employer guaranty your employment for the next several years?
