The disorder characterized by a reduction of oxygen to the heart, crushing chest pain, and difficulty in breathing, but no loss of consciousness or damage to the myocardium is:

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The symptoms described are characteristic of angina pectoris, which is caused by a temporary reduction in blood flow and oxygen supply to the heart muscle. There is no permanent damage to the myocardium, as seen in a myocardial infarction, and no disturbance in heart rhythm, as seen in an arrhythmia. A stroke is a different condition and affects the brain, not the heart.

The Disorder Characterized by a Reduction of Oxygen to the Heart