Most Common Symptoms Of A Heart Attack

Unusual Fatigue

An individual having a heart attack may experience unusual fatigue. Unusual fatigue occurs when there is not enough energy being produced by the cells that make up an individual's tissues to meet the demand of their body. Cells require a constant and adequate supply of glucose and oxygen to produce usable cellular energy or ATP. During a heart attack, the heart is not receiving an adequate supply of blood. This malfunction causes the heart to be unable to pump blood at a normal rate, reducing the amount of oxygenated blood that can reach all of the body tissues. Without enough oxygenated blood, the cells are not able to produce the quantity of ATP needed to carry out normal functions. As a result of the shortage of usable cellular energy from a heart attack, the body allocates the nutrients and energy it does have away from the peripheral muscles to the vital organs. This reallocation of nutrients and cellular energy causes an affected individual to feel unusually fatigued having a heart attack.

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