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Atrial fibrillation is a common heart rhythm disorder (arrhythmia) characterized by a fast, irregular, and chaotic beating of the upper chambers of the heart (the atria). This irregular rhythm severely affects the heart's ability to pump blood efficiently.
read more about atrial fibrillation ...The cause is disorganized electrical signals in the atria, which override the heart's natural pacemaker. Instead of contracting in a coordinated way, the atria twitch (fibrillate) rapidly and chaotically, preventing them from emptying blood completely into the ventricles. This causes blood to pool in the atria. This pooling blood is the direct source of the disorder's main danger, as it greatly increases the risk of clot formation within the heart.
Symptoms include a fluttering or racing heart sensation, shortness of breath, dizziness, and extreme fatigue. The chaotic beating reduces the heart's overall output, making the patient feel weak and exhausted. Critically, the pooling of blood leads to the formation of clots, which can then travel from the heart to the brain, causing a devastating ischemic stroke. Stroke prevention is the most urgent management goal for this disorder.
Diagnosis is confirmed using an electrocardiogram (ECG), which records the heart's electrical activity. Other monitoring devices, such as Holter monitors (worn for 24 hours), may be used to capture intermittent episodes.
Atrial fibrillation severely impacts vision through stroke. Clots formed in the heart can travel to the eye and block the central retinal artery (retinal artery occlusion or "eye stroke"). This causes sudden, painless, and severe vision loss, which is often permanent.
Management involves two main strategies: rate control (medications to slow the heart rate) and stroke prevention (prescribed blood thinners or anticoagulants). Procedures like cardioversion or ablation may be used to restore a normal heart rhythm.
Atrial fibrillation is chronic, but procedures like ablation or cardioversion can sometimes restore and maintain a normal rhythm.
Yes, many people feel a distinct fluttering, "thumping," or a fast, irregular heartbeat in their chest.
It is vital because AFib allows blood to pool in the heart, forming clots that can travel to the brain, causing a stroke.
If you experience sudden heart palpitations or shortness of breath, see a cardiologist. AFib can cause "Amaurosis Fugax", temporary blindness in one eye, if a small clot briefly blocks a retinal artery. This is a critical warning sign of a major stroke.
American Heart Association. AFib Resources (heart.org). 2025.
Mayo Clinic. Atrial Fibrillation Symptoms (mayoclinic.org). 2024.
Cleveland Clinic. AFib Guide (clevelandclinic.org). 2023.
StatPearls. Atrial Fibrillation (ncbi.nlm.nih.gov). 2024.