I would certainly recommend some medium intensity workouts as well. Consult with your doctor about whether or not some basic strength training would be OK. I certainly wouldn't recommend super sets or circuits for you, but some basic barbell squats, bench press, etc with decently timed rests to bring the heart rate down again should be doable. You will just need to be focused on how your body is feeling, what your heart rate is, and all that jazz much more so that the rest of us. Good luck to you!