environment applies to all the external factors that have a formative influence on one's physical, mental, or moral development. the kind of environment that produces juvenile delinquents; milieu applies especially to the physical and social surroundings of a person or group of persons.
Myocardial ischemia is an imbalance between myocardial oxygen supply and demand. Left untreated, it results in angina pectoris, myocardial stunning, myocardial hibernation, ischemic preconditioning, postconditioning, or under the most severe instances, acute coronary syndrome and myocardial infarction.
A short period of ischemia causes reversible effects: The heart cells will be able to recover. When the episode of ischemia lasts for a longer period of time, heart muscle cells die. This is called a heart attack or myocardial infarction. That is why it is critical to recognize ischemia on the ECG in an early stage. Severe ischemia results in ECG changes within minutes.