The cause is a disorder in the heart's electrical system.often, people who have af may not even feel symptoms. Atrial fibrillation (af) is the most common type of arrhythmia. An arrhythmia is a problem with the speed or rhythm of the heartbeat.An arrhythmia in which minute areas of the atrial myocardium are in various uncoordinated stages of depolarization and repolarization instead of intermittently contracting, the atria quiver continuously in a chaotic pattern, causing a totally irregular, often rapid ventricular rate.It is caused by abnormal impulse generation In such case, blood cannot be effectively pumped into the lower chambers of the heart (heart ventricles). Abnormal cardiac rhythm that is characterized by rapid, uncoordinated firing of electrical impulses in the upper chambers of the heart (heart atria).On the ecg it is described by the replacement of consistent p waves by rapid oscillations or fibrillatory waves that vary in size, shape, and timing, associated with an irregular, frequently rapid ventricular response when atrioventricular conduction is intact. Instead of intermittently contracting, the atria quiver continuously in a chaotic pattern, causing a totally irregular, often tachycardia ventricular rate. A supraventricular arrhythmia characterized by uncoordinated atrial myocardium activation due to multiple reentry circuits with consequent deterioration of atrial mechanical function.On the ecg it is described by the replacement of consistent p waves by rapid oscillations or fibrillatory waves that vary in size, shape, and timing, associated with an irregular, frequently rapid ventricular response when atrioventricular conduction is intact The rhythm disturbance originates above the ventricles A disorder characterized by a dysrhythmia without discernible p waves and an irregular ventricular response due to multiple reentry circuits.
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