In short, if you like your job and intend on staying in healthcare, the part-time option may be ideal for you. You get to work at a job you like, have money, and go to school (only downside is that you have zero free time). If you're looking to do a big career switch (i.e. completely out of healthcare), then you may want to focus on full-time programs; you can still do it through part-time programs, but it's a harder transition simply because recruiters are focused on full-time students.
As for your chances, it's hard to say. On the surface, there's not really any huge concerns (other than the fact that you may come across as one-dimensional if you don't have much to talk about outside of work). It comes down to how effective you are at conveying who the "individual behind the resume" is -- and how dynamic that person may be.
Alex Chu
alex@mbaapply.com
www.mbaapply.com
http://mbaapply.blogspot.com