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Atrial fibrillation is the most common type of cardiac arrhythmia. In a healthy heart, the sinoatrial node or SA node initiates all electrical impulses in the atria. In atrial fibrillation, electrical impulses are initiated randomly from many other sites called ectopic sites in and around the atria, commonly near the roots of pulmonary veins. These un-synchronized, chaotic electrical signals cause the atria to quiver or fibrillate rather than contract. Although the atrial rate during atrial fibrillation can be extremely high, most of the electrical impulses do not pass through the atrioventricular the AV - node to the ventricles. This is due to refractory properties of the cells of the AV node. Those that do come through are irregular. Ventricular rate or heart rate is therefore irregular and can range from slow - less than 60 - to rapid -more than 100 - beats per minute. On an ECG, atrial fibrillation is characterized by absence of P-waves and irregular narrow QRS complexes. Reminde
