I have to have one yearly in order to stay on the transplant list.
I can't do a treadmill test because of my bum knee/hip/back so I have to be injected with dobutamine in order to raise my heart rate.
Even then they can't raise it very high. I have to lay on a table and do leg lifts.
It's old hat by now, nothing to be concerned about.
It is pretty cool to see the sonogram screen though.

