Many studies in the past decade have demonstrated diurnal variation in the onset of acute cardiovascular disorders in hypertensive patients, such as acute coronary syndrome like heart attack, angina etc and ischemic and hemorrhagic stroke occurring in the morning (6:00AM to noon) after a nadir in these events during the night.

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Heart attack is called as Myocardial Infarction in medical terminology. Heart is supplied by right and left coronary arteries. Whenever these arteries are blocked, blood supply to heart stops and wall of heart damages, result is Heart Attack with symptoms of severe constricting chest pain radiating to left arm jaw or shoulder, profuse sweating, vomiting, and feeling of anxiety. If the blood supply is cut off for more than a few minutes, muscle cells suffer permanent injury and die. This can kill or disable someone, depending on how much heart muscle is damaged.

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