Can you briefly describe what is ischaemia? and is myocardial infarction the same with heart attack?

definitions: Ischemia (ischaemia in the uk) is the condition that results from inadequate blood supply or circulation to viable tissue. When ischemia is sufficiently severe and prolonged that heart muscle is irreversibly injured and/or dies (undergoes ischemic necrosis), myocardial infarction results. Heart attack is the non-medical or popular term for mi.

Lack of blood supply: Yes it is same. Lack of blood to heart muscle by blood vessel and causing damage to muscle

reduced blood supply: Yes, myocardial infarction is a heart attack and is caused by a blocked artery which leads to the reduced blog supply or ischemia of the heart muscle.