一个electrocardiogram (ECG or EKG) is a test that measures the electrical activity of your heart. Abnormal patterns of activity suggest that part of your heart may have been damaged from a heart attack or some other heart condition.
It’s estimated that in the United States, one person has a heart attack every
在本文中，如果可以预测未来的心脏病发作，以及其他测试以评估您的心脏健康，我们将检查EKG的准确性如何用于诊断先前的心脏病发作。
一个ekg.is a safe, fast, noninvasive way of checking your heart’s electrical activity.
您的心跳由电气系统控制，当您的心脏的上腔（Atria）合同时控制，然后当您的心脏下腔室（心室）击败时。通常，这发生在同步模式中并且以可预测的速度发生。
Changes in how your heart beats can be an indication of cardiac problems, such as aheart attackor心律失常。
一种ccording to the
- 它测量电波从心脏的Atria移动到心室的时间，这揭示了电活动是否太快或慢，或者是否是混乱的。
- 它还测量通过您的心灵移动的电活动量，可以帮助您的医生确定您的心脏是否正在运作。
一个ekg.involves the placement of small electrodes on your chest and limbs. The electrodes are removable stickers attached by wires to the EKG machine, which records electrical signals from your heart and displays them on a monitor.
打印输出显示您心脏的电气模式。这是这样做的，这样你的心脏在那一刻就会表现出来。这很重要，因为您心中的电信活动的一些变化是暂时的。这就是为什么有能力从您的心脏平常的电气模式中有所了解。
EKG是几种测试之一，可以帮助诊断心脏病发作。这通常是其中一个筛选performed when someone goes to the hospital with heart attack symptoms.
因为受损的心脏组织倾向于破坏regular flow of electrical energy throughout the heart, an EKG can instantly detect if there is a problem.
In addition to indicating the possibility of some heart muscle damage, an abnormal EKG reading may also be the result of reduced blood flow through the coronary arteries. This is often the trigger for most heart attacks.
一个ekg.may also diagnose an abnormal heart rhythm, called an arrhythmia.
In addition to an EKG, a blood test is also done if a heart attack is suspected. Damaged heart tissue usually releases certain proteins calledtroponins。Unusually high levels of troponin T and troponin I are often a sign of a heart attack.
心电图可以检测到你有一个心attack years ago without knowing it. Abnormal electrical patterns during the test suggest that part of your heart may have been damaged from lack of oxygen.
Not all heart attacks produce noticeable symptoms. If you’ve had asilent heart attack那you may not know it occurred until you have an imaging test like an EKG,MRI那CT scan， 要么ultrasound。
一个ekg.is one tool that doctors use to find evidence of previous heart attacks, but it’s best used when combined with other diagnostic techniques like blood tests and imaging. It’s relatively common for EKG results to give a false positive.
一
- Poor sensitivity.The EKG only correctly identified a previous heart attack 48.4 percent of the time when compared with an MRI.
- Good specificity.与MRI相比，EKG正确地确定了之前没有发生的83.5％的时间。
- 积极的预测准确性。People with EKG results that suggested they had a heart attack had a 72 percent chance of actually having had a heart attack.
- Negative predictive accuracy.有ekg结果的人建议他们没有心脏病发作有64.2％的概率，实际上没有心脏病发作。
The poor sensitivity and the modest negative predictive accuracy of the EKG findings suggest that EKG alone may not be the best way to diagnose a previous heart attack.
一个ekg.can potentially predict future risk of heart attack by uncovering abnormalities in the electrical activity of your heart.
一种
In another
单独使用EKG结果并不是未来心脏病的有效预测因素，在那些低风险中的心脏病发作。尽管正常的EKG阅读，但仍有心脏病发作。
一种limitation of EKG is that it cannot show an asymptomatic blockage in your arteries that may put you at risk of a future heart attack. EKGs are best used as a predictor of a future heart attack in combination with other tests.
研究人员发现证据表明合并的结果
The five tests are:
- 标准12引导EKG提供有关心肌增厚的信息
- 冠状动脉钙扫描to identify plaque buildup in the arteries of the heart
- C-reactive protein blood test测量炎症
- NT-proBNP blood test测量心脏的压力
- 肌钙蛋白T血液测试to measure damage to the heart
还可以使用许多其他测试来帮助检测先前的心脏病发作。这些包括：
- 一个洞穴监视器。一种HOLTER MINTRIN.is a type of EKG that measures the electrical activity of your heart over a period of 24 hours or longer as you go about your daily activities. Electrodes attached to your chest send information about the electrical activity of your heart to a small, battery-powered device.
- Blood tests.一种blood test can look for certain markers that indicate you’ve had a heart attack. One substance commonly used as a marker of a heart attack is troponin. Levels of this protein remain elevated in the blood for up to 2 weeks after a heart attack.
- 冠状动脉CT血管造影。一种coronary CT angiogramuses X-rays to produce an image of the arteries that bring blood to your heart. A special dye is injected into your bloodstream that allows a doctor to view the dye as it flows through your arteries.
- Cardiac catheterization.During acardiac catheterization那a long tube called a catheter is inserted through a puncture in your skin and inserted into an artery leading to your heart. A contrast dye is injected into your bloodstream so that the doctor can examine your heart.
- 超声心动图。一个echocardiogramuses ultrasound waves to show a live image of your heart. The image can tell a doctor if one part of your heart isn’t pumping blood as well as it should.
- MRI.一种cardiacMRI使用强大的磁场和无线电波来产生内心的三维图像。MRI允许医生识别缺乏血液流向某个区域，或者看看你的一部分是否受损。
沉默的心脏病发作是一种心脏病发作，甚至很少或没有症状。如果你有一个沉默的心脏病发作，你可能有一个
当存在症状时，他们往往很温和，他们似乎没有特别关注。疲劳，温和的胸痛感觉像消化不良，流感样症状都是可能的迹象。
沉默的心脏病发作是由于传统的心脏病发作等血流缺乏血液流动。改善整体心血管健康和定期进行检查可以帮助您降低风险。
EKG可以通过筛选您心脏电活动的异常来帮助识别先前的心脏病发作。EKG结果通常最好与血液测试和成像技术结合使用，以减少假阳性的机会。
It’s still not clear how effective EKGs are at identifying your future heart attack risk. Research suggests that they may be best used in combination with blood tests and a calcium coronary scan for this purpose.
如果您认为您可能已经心脏病发作，请立即寻求医疗态度很重要。你越早得到适当的治疗，你的前景越好。