Hello, I'm an expert in the field of cardiology with a focus on arrhythmias. I'm here to provide you with accurate and helpful information regarding heart conditions.

Atrial fibrillation (AFIB), also known as atrial flutter, is a common type of abnormal heart rhythm, or arrhythmia, that begins in the upper chambers of the heart (the atria). In AFIB, the atria quiver instead of beating effectively to move blood into the ventricles. This can lead to a rapid and irregular heartbeat, which can cause poor blood flow and make you feel dizzy or weak. It's important to note that "AFIB" and "atrial flutter" are often used interchangeably, but they are slightly different conditions. Atrial flutter is a specific type of AFIB where the electrical signals in the atria are very rapid and regular, whereas in typical AFIB, the signals are rapid and irregular.

Here's the translation in Chinese:

你好，我是心脏病学领域的专家，专注于心律失常。我在这里为您提供关于心脏状况的准确和有用的信息。

心房颤动（AFIB），也称为房颤，是一种常见的心律不齐类型，起始于心脏的上部腔室（心房）。在AFIB中，心房颤动而不是有效地跳动将血液输送到心室。这可能导致心跳快速且不规则，从而导致血液循环不良，使人感到头晕或虚弱。需要注意的是，“AFIB”和“房颤”经常交替使用，但它们是略有不同的状况。房颤是一种特定的AFIB类型，其中心房中的电信号非常快速且规律，而在典型的AFIB中，信号是快速且不规则的。

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Atrial fibrillation and atrial flutter are very fast electrical discharge patterns that make the atria (upper chambers of the heart) contract very rapidly, with some of the electrical impulses reaching the ventricles and sometimes causing them to contract faster and less efficiently than normal.read more >>