> I would think for compliance reasons hospitals would not want to alter the records and only go by transcripts, but what do I know...

I'm puzzled by this as well. Why not just generate a transcript and be done with it? If it's a particularly long transcript that's being referenced repeatedly for whatever reason let the humans manually mark it up with a side by side summary when and where they feel the need. At least my experience is that usually these sort of interactions don't have a lot of extraneous data that can be casually filtered out to begin with. The details tend to matter quite a lot!