Had a clear echocardiogram 3 years ago, no blocked arteries. could i have blocked my arteries enough to have a heart attack now?

Was the: Echo study done with or without EXERCISE ? If it was a "stress echo" that was negative , congrats, the chances of signicant "PREMATURE" coronary disease 3 years later is quite small...A "plain" echo is less useful in detecting coronary insufficiency and is done for STRUCTURAL reasons (Heart valves etc) It can pick up OLD cardiac injuries. I hope this helps! Dr Z