Why MYOCARDIAL INFRACTION ( heart attack ) incidence is more common in morning hour?

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Explanation:-

In early morning their is adrenaline surge and more platelets stickiness and more blood pressure which may leads to more chances of plague lodging in blood vessels.!

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Cortisol is the culprit.

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In the morning due to a natural surge in sympathetic activity, which causes:
Increased blood pressure,Higher heart rate,Increased platelet aggregability,Higher levels of circulating cortisol and catecholamines.

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Here are the key reasons:
1. Increased Sympathetic Activity: Upon waking, the body’s “fight or flight” system (sympathetic nervous system) becomes more active, increasing heart rate and blood pressure. This raises the heart’s oxygen demand and can strain vulnerable coronary arteries.
2. Rise in Cortisol and Catecholamines: Hormones like cortisol, epinephrine, and norepinephrine spike in the early morning. These cause vasoconstriction, higher blood pressure, and increased heart workload, all of which can trigger plaque rupture.
3. Higher Platelet Aggregability: Platelets are more likely to clump together in the morning, increasing the risk of clot formation, which can block coronary arteries.
4. Reduced Fibrinolytic Activity: The body’s ability to break down clots (fibrinolysis) is at its lowest in the morning, which means clots that form are more likely to persist and cause blockages.
5. Postural and Hemodynamic Changes: Standing up and moving after hours of lying down causes fluid shifts and increases cardiac workload, further stressing the cardiovascular system.

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Some New Info!

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From what I understand, heart attacks are more common in the morning because of the way our body reacts to stress and changes in hormones. In the early hours, levels of cortisol (the stress hormone) peak, which can increase blood pressure and cause blood vessels to constrict, making the heart work harder. Plus, blood tends to be “stickier” in the morning, which can increase the chances of clot formation in narrowed arteries. I guess it’s like our body is just waking up and getting into gear, but sometimes, those natural changes can put extra strain on the heart. It’s a bit like the body getting ready for the day, but for some, it might be too much too soon.