Jess - sounds feasible by using the pre- and post-scores from the patient satisfaction surveys. I think then you'll have to figure out what a "meaningful" change is. If you are able, would be nice to be able to ask patients on their way out about their view of the consultation.
You may look into the "SURE" decisional conflict scale - 4-item scale that's been validated in several populations. You may already know about it but just in case, I think it's helpful to think through.