I had a CT-A scan done a few days ago and one of the criteria was that my heart rate needed to be at or below 65BPM. I was bouncing around 63 to 67. The nurse/tech that was doing the prep said that she may have to give me a shot to lower my heart rate. When I asked what drug, she said metoprolol. I said NO! Diltiazem is OK, but if you want to give me metoprolol I will walk out. I got neither and had the CT-A scan.