SDI/MDI/Dialog-based

I have to start developing an application using Visual C++ that keeps the patients of an hospital.

The UI requirements are:
1. in the left side of application always is a group of controls those shows patient info: ID, name, birth date, and so on.
2. in the right side may be seen different changeable (from menu and/or toolbar) views containing, for example, the results of different analyses, different graphs, tables, histograms, and so on.

My question is: which of above approaches you recommend?

Dialog-based - more to work but easier to handle.