Dr. Martin is a practicing Internal Medicine doctor and has been speaking Spanish for over 10 years. Her friend Maria Bjorklund, MS, who is originally from Peru, often plays the role of the patient in the dialogs, proofreads the podcast transcripts and is a high school Spanish teacher.
She also supplements the medical podcasts with Spanish grammar podcasts.
So, if you're in the medical field or know someone who is, I would recommend these podcasts. And now that I think about it, it might be possible to use these in more advanced classes - learning about parts of the body and so on.