I had a 64 slice CT scan which showed 70 & 80 percent blockage 5 years ago. New echo stress test showed no problems. I am not sure who to believe. I sit here now feeling like someone is squeezing my heart, and I showed a lot of irregular heartbeats in the echo stress test. I also have MRI's twice a year. I feel I have serious potential problems, but my cardiologist is not concerned.