Oct 3, 2025 · Atrial fibrillation (AFib) is an irregular and often very rapid heart rhythm. An irregular heart rhythm is called an arrhythmia. AFib can lead to blood clots in the heart. The condition also increases …

Atrial fibrillation (AFib) is an irregular heart rhythm that begins in your heart’s upper chambers (atria). Symptoms include fatigue, heart palpitations, trouble breathing and dizziness.

Atrial fibrillation is an irregular heartbeat, or arrhythmia. Atrial fibrillation, also known as AFib or AF, can lead to blood clots, stroke, heart failure and other heart-related complications.

In atrial fibrillation, the lack of an organized atrial contraction can result in some stagnant blood in the left atrium (LA) or left atrial appendage (LAA). This lack of movement of blood can lead to thrombus …

May 15, 2024 · Atrial fibrillation, often called AFib or AF, is the most common type of treated heart arrhythmia. Some people who have AFib don’t know they have it and don’t have any symptoms.

Find in-depth information on atrial fibrillation, including symptoms ranging from lack of energy to heart palpitations and dizziness.

Afib stands for atrial fibrillation (AF), which is a type of arrhythmia, or abnormal heartbeat. Afib is caused by extremely fast and irregular beats from the upper chambers of the heart (usually more than 400 …

Atrial fibrillation (AFib) is a common heart rhythm disorder where the heart’s upper chambers, called the atria, beat irregularly and out of sync with the lower chambers, called the ventricles.

Apr 24, 2025 · This JAMA Patient Page describes atrial fibrillation and its symptoms, diagnosis, and treatment.

Sep 14, 2025 · Symptoms of atrial fibrillation include a rapid and irregular heartbeat, shortness of breath, and dizziness. Treatment with medication, devices, or surgery can help control your heart rate and …