This is when a blood vessel completely blocks, preventing oxygen getting to the part of the
heart muscle concerned. The area of
muscle which has been killed is small, but it has resulted in abnormal wall movement. However, the overall function of the left ventricle is good and your heart is pumping well, giving an EF of 56% which is fine. You was very lucky that the blockage was probably low down in the Coronary artery, causing only a small attack.