Myocardial ischemia is owing to poor blood supply and infarction is due to no blood supply. The severity of both differs and ischemia can progress to infarction.
When blood flow is completely blocked to the heart, ischemia can lead to a heart attack .
Myocardial ischemia is a coronary artery disease during which the heart tissue is slowly or suddenly starved of oxygen and other nutrients. Eventually, the affected heart tissue will die.
Myocardial ischemia is caused by blockage of an artery due to atherosclerotic plaque as well as blood clots (which tend to form on plaque), artery spasms or contractions, or any of these factors combined.
Reversible myocardial ischemia is a condition in which areas of myocardium becomes ischemic during stress (exercise) but regain its viabililty (circulation) on resting and do not progress to infarction. Such areas can be detaected by myocardial perfusion imaging like Thallium (T-201)scan.