I had a massage in the hospital. I think it was what they call a soft tissue massage. I don't remember the explanation much, but I think the goal was to stimulate the body's glands to help the body rid itself of excess fluid faster. I had a little fluid buildup in my legs and ankles at that time, but it was mostly gone anyway by the time I had the massage, so I'm not sure it helped with that. The massage did make me feel good though. I felt like my body got lighter, had less chest pain, and could breath more freely.
Last week (8 weeks post op) I had a massage by a nurse who was also a massage therapist, at my cardiac rehab. It was a more conventional back massage sitting chest down in the massage chair. I have very little pain in my chest at this point, so it was no problem.
Good luck with your upcoming surgery!