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  1. First Interstate Bank

    Explore personal and business banking, loans, and digital tools backed by local service and community commitment.

  2. Atrial fibrillation - Symptoms and causes - Mayo Clinic

    Jan 14, 2026 · 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 …

  3. What is Atrial Fibrillation? - American Heart Association

    Mar 26, 2025 · 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. AFib …

  4. Atrial Fibrillation (AFib): Causes, Symptoms, and Treatment

    Nov 15, 2023 · What Is Atrial Fibrillation? Atrial fibrillation, also called AF or AFib, is a quivery, fluttery heartbeat. You might also hear the doctor call it arrhythmia. It means your heart’s normal...

  5. Atrial Fibrillation (AFib) - Baylor Scott & White Health

    Atrial fibrillation (AFib) is the most common type of heart arrhythmia, or irregular heartbeat. When you are living with AFib, the electrical signals that regulate your heartbeat are interrupted by chaotic …

  6. Atrial Fibrillation - What Is Atrial Fibrillation? | NHLBI, NIH

    Nov 30, 2022 · Atrial fibrillation, also known as A-fib or AF, is one of the most common types of arrhythmias (irregular heart rhythms). Atrial fibrillation causes your heart to beat irregularly and …

  7. About Atrial Fibrillation | Heart Disease | CDC

    May 14, 2024 · Atrial fibrillation, often called AFib or AF, is the most common type of treated heart arrhythmia. An arrhythmia is when the heart beats too slowly, too fast, or in an irregular way.

  8. Atrial Fibrillation (A-Fib): Symptoms & Risk Factors | Brigham and ...

    Atrial fibrillation (A-fib) is a type of arrhythmia (abnormal heartbeat) that affects almost five million Americans. It often originates in the left atrium (the upper left chamber of the heart). When atrial …

  9. What Is AFib and Why Is It Becoming More Common?

    Feb 25, 2025 · Atrial fibrillation is an irregular and often fast heart beat that can cause poor blood flow. Usually known as AFib, it is becoming more common. In addition, this condition may affect people at …

  10. Atrial Fibrillation and Atrial Flutter - Heart and Blood Vessel ...

    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 …