When do most heart attacks occur -- and why?

From the outside, a heart attack can seem very sudden. But from the inside -- like inside an artery -- it's actually pretty predictable.

Động mạch bị tắc , còn được gọi là bệnh động mạch vành (CAD) , là nguyên nhân chính gây ra các cơn đau tim [nguồn: NHLBI ]. Động mạch bị tắc nghẽn bởi một thứ gọi là mảng bám , một chất béo tích tụ trên thành động mạch. Mảng bám răng thường tích tụ khi có quá nhiều chất béo và cholesterol trong chế độ ăn uống - và quá nhiều cholesterol trong máu . Về cơ bản, mọi thứ bắt đầu dính vào thành động mạch của tim khi máu đi qua, và cuối cùng có thể hình thành cục máu đông. Nếu nó đủ lớn, cục máu đông đó có thể làm tắc động mạch hoàn toàn.

In a heart attack, oxygen supply (via blood flow) to the heart has been cut off, resulting in damage to or death of heart muscle. The heart stops pumping if the blood flow isn't immediately restored. When it stops pumping, that's a heart attack. In the United States, about 1.1 million people suffer heart attacks every year, and about half of those heart attacks result in death [source: NHLBI].

Heart attacks seldom happen without some kind of warning. They can often be explained by medical history, including high cholesterol or high blood pressure, or by a family history of heart disease . But can they also be explained by external circumstances, like time of year or time of day? Are there certain occasions that pose greater risk for people with heart disease?

S­urprisingly, the answer is yes. For people who have risk factors for a heart attack, like high blood pressure, high cholesterol and coronary artery disease, not only why but also when a heart attack might happen is more obvious than you might think. At certain times of the year, heart-attack rates increase, and the primary culprit in the trend is hard to avoid.

In this article, we'll find out when most heart attacks occur and why they're more likely during those times. With some planning, it may even be possible to decrease the risk of having a heart attack during the high season for coronaries.

Once you know the culprit for the spike in heart attacks, you'll be able to guess which months make up that high season. Here's a hint: It's T minus 1 and counting and you've still got 13 people on your gift list.

It's something of a Christmas miracle that Santa isn't long dead from a heart attack. Increases in stress levels mean increases in heart attacks, and it's hard to find a more stressful time than the holidays. In the United States, there are greater than 50 percent more heart attacks in winter months than in summer months, and it's mostly about stress [source: MNT].

Stress is one of the most difficult heart-attack risk factors to eliminate from our lives. And for people with high blood pressure (hypertension), it's crucial to do so.

High blood pressure can damage arteries because the increased force of blood pumping through them pushes hard against artery walls. Damage to the artery walls encourages plaque to form there, leading to clogged arteries. It's not clear exactly why stress can lead to heart attacks in people with hypertension, but it's probably related to the release of adrenaline [source: WCN]. Stressful situations cause your brain to flood the body with adrenaline, the "stress hormone," which triggers a fight-or-flight response. It speeds up your heart rate. With the heart trying to pump more high-pressure blood in less time, it would make sense that the risk of heart damage would increase.

You can stop eating trans fats and start walking around more; but it's a bit trickier to tell your family members that they can't pack into your home for the holidays. Holiday-related stress makes November through the end of December, also known as Thanksgiving through New Year's, the most popular time of year for heart attacks.

It's not hard to see why. Stress makes us do some unhealthy things, like eat the rest of the pumpkin pie after everyone leaves or skip a morning walk because we're hungover from too much eggnog. Along those lines, stress increases heart-attack numbers in two related ways: by decreasing healthy behaviors and by increasing risky behaviors.

Giữa Lễ Tạ ơn và Năm mới, mọi người làm nhiều việc có thể dẫn đến đau tim, bao gồm ăn nhiều thực phẩm giàu chất béo , chỉ ăn nhiều hơn nói chung, uống nhiều rượu hơn và hút nhiều thuốc lá hơn. Đồng thời, họ cắt giảm một số thứ có thể giúp ngăn ngừa các cơn đau tim, chẳng hạn như tập thể dục thêm .

Vội vàng để hoàn thành việc mua sắm trong kỳ nghỉ hoặc cho gà tây vào lò nướng có thể khiến một số người quên uống thuốc huyết áp. Đây là một vấn đề đặc biệt vào buổi sáng, khi hầu hết các cơn đau tim xảy ra [nguồn: MNT ]. Huyết áp có xu hướng cao nhất vào buổi sáng. Nếu thuốc khiến tim bạn vượt qua cơn đột ngột vào buổi sáng đó, việc bỏ qua thuốc có thể gây ra những hậu quả nghiêm trọng đến vào giờ sáng, đặc biệt là sau một đêm uống rượu, hút thuốc và làm bánh pho mát.

The overall result is that we abandon the activities that could keep us healthy, just when we need them most. To avoid the increased risk of heart attack during the winter holidays, it's important to try to maintain some balance. Drink one glass of high-fat, high-alcohol eggnog instead of two. If you feel yourself getting overly stressed, skip that one holiday party you didn't want to go to anyway. Start your holiday shopping six months in advance so you can avoid the last minute panic and the adrenaline surge that could put your heart over the edge.

And just in case things do start to get crazy, by all means, pin a "take your meds" note on the turkey in the fridge.

Other High Times

The holidays aren't the only big times for heart attacks. Major sporting events like the Super Bowl and the World Cup always see an increase in heart attacks, as do big bank failures, apparently due to increases in stress levels [sources: MNT, Guardian]. For women, heart attacks rates spike during pregnancy, probably due to changes in blood composition [source: Y!].

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