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The underlying diseases and physical condition play key roles even if one suffers a minor heart attack. Also, there may be no apparent symptoms to know if one has suffered a heart attack or "severe heart attack". Hence, it's better to call emergency services in any such cases immediately. The Golden Hour: The golden hour is crucial during a heart attack. It is one hour immediately after the heart attack; the medical attention within this period helps lower the risk of heart failure and other associated risks. If The LAD (Left Anterior Descending) Artery is involved: Although any blockage in arteries causes a heart attack, this is one of the main arteries responsible for 50% of heart muscles' blood supply, sending oxygen-rich blood to the heart. The blockage in this artery results in the expiration of cells of heart muscles in minutes. Survival in such cases depends entirely on immediate emergency treatment. The occlusion by clot or thrombus: The complete or rapid...