Atrial fibrillation occurs when action potentials fire very rapidly within the pulmonary veins or atrium in a chaotic manner. The result is a very fast atrial rate — about 400 to 600 beats per ...
This would even include sinus tachycardia with a right or left bundle branch block, atrial fibrillation/flutter with a right or left bundle branch block or AVNRT with a right or left bundle branch ...