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Ischemia is the medical term for what happens when your heart muscle doesn't get enough oxygen. Ischemia usually happens because of a shortage of blood and oxygen to the heart muscle. It is usually caused by a narrowing or blockage of one or more of the coronary arteries (which supply blood to the heart muscle). In many cases ischemia is a temporary problem.
Proof that stress really does cause heart attacks: Adrenaline can increase white blood cell production which can cause ruptures. 1  Extra white blood cells can cause inflammation in people whose arteries are already thickened with plaque.  These inflammations can lead to ruptures which can cause heart attack in minutes.