03/21/2026
During a mild heart attack, blood flow through a coronary artery is reduced but not completely cut off. The heart muscle supplied by that vessel begins to suffer from lack of oxygen. Heart cells rely heavily on oxygen to produce energy, and even short interruptions quickly disrupt their normal function.
As oxygen levels fall, affected muscle cells switch to inefficient energy pathways. Waste products build up, cell membranes weaken, and electrical signaling becomes unstable. Some heart muscle cells are injured but not immediately destroyed, creating an area of stunned tissue that cannot contract properly.
If blood flow is restored in time, part of this damaged muscle can recover. However, cells that are deprived for too long die and are replaced with scar tissue. This scar does not contract like healthy muscle, slightly reducing the heart’s pumping strength even after a mild infarction.
