Chronic atrial fibrillation

Atrial fibrillation, referred to as atrial fibrillation, refers to the irregular impulses that occur at 350-600 times per minute in the atrium, and the muscle fibers in each part of the atrium are extremely uncoordinated and thus lose effective contraction. It is also one of the most common arrhythmias in the elderly. Due to the presence of physiological conduction block in the atrioventricular junction, the ventricular rate is significantly lower than the atrial rate, generally 90 to 150 beats / min, rarely exceeding 170 beats / min. Atrial fibrillation can be divided into paroxysmal and persistent (chronic).