I'd try again to convince your preceptor coordinator before giving up. Here's some things you might be able to do to get her to side in your favor:
1. Have a talk with the unit manager about the types of patients on the unit and the skills and comorbidities that are most frequently seen. Patients with heart failure also tend to have a lot of other issues: diabetes, obesity, PVD, hypertension, etc. They also get sick with other things, such as pneumonia and infection. There are all things you will see on a med-surg floor. Does this floor have post-operative patients? Wound care? Patient's with ostomies? Any patients on ventilators or with tracheostomies? Make a big list that focuses, not on the cardiac care, but the more med-surg stuff.
2. Compile a list of the skills that you completed in previous med-surg clinicals, including how much time you have spent there. Include your grades from clinicals and lecture and any clinical evaluations that show that you excelled in those clinicals. If you don't have evaluations, ask for letters from the clinical instructors.
3. Finally, write a mini-speech to say to your preceptor coordinator. Explain what you have already done in clinicals and present the material that supports that you have learned the med-surg stuff well. Explain your goals for the future and how you believe that the heart failure unit should be considered for your preceptorship. Then give her your information that shows the diversity of the patients on the unit, and how they really are the same patients that will be found on other med-surg units. Then, make sure that you mention that you already have the permission of the unit manager to precept. Give your coordinator her contact information in case she wants to discuss the arrangement in more detail.
Don't forget to include a few "schmoozing" statements to help your case. Such as, "I understand that it much be really hard for to coordinate the preceptorships of so many students. I can imagine it's a very difficult job. I want to help as much as possible and come up with an arrangement that works best for both of us."
Oh, and one more thing- see if you can actually find anywhere that says students have to precept on a med-surg unit. Review your nursing handbook, policies of the nursing school
, etc. Ask the dean or an instructor if she can direct you to the place where you might find these policies. Because I really doubt there is a specific policy that states, "All students must do their preceptorship only on a dedicated med-surg unit." And if their isn't a policy, then it's just opinion. Be sure to mention that during your next meeting with your preceptor coordinator.
There comes a time when you need to take your future and education into your own hands. This is it! Good luck!