Is bradycardia a symptom of atrial fibrillation?

Hello, I'm an expert in cardiology with a focus on arrhythmia. Let's dive into your question about bradycardia and atrial fibrillation. Bradycardia is a condition where the heart rate is slower than the normal range, typically below 60 beats per minute in adults. Atrial fibrillation (AFib), on the other hand, is an irregular and often rapid heart rate that occurs when the upper chambers of the heart (the atria) beat chaotically and out of coordination with the lower chambers (the ventricles). Now, regarding your question, bradycardia is not a typical symptom of atrial fibrillation. In fact, AFib is more commonly associated with tachycardia, which is a rapid heart rate. However, it's important to note that in some cases, particularly in patients with a condition known as sick sinus syndrome, AFib can coexist with periods of bradycardia. This is because the sinus node, which is responsible for regulating the heart rate, may not be functioning properly, leading to an irregular heart rhythm that includes both fast and slow heart rates. In summary, while bradycardia is not a standard symptom of atrial fibrillation, there are scenarios where both conditions can occur together, especially when there's an underlying issue with the heart's natural pacemaker.

It may cause no symptoms, but is often associated with palpitations, exercise intolerance, angina, congestive heart failure (shortness of breath, edema). ... The symptoms are similar to those of atrial fibrillation: dizziness, fatigue, chest pain, angina, shortness of breath and fainting [2].