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The nature of atrial fibrillation is where multiple electrical impulses are generated in the atria at the same time which cause chaotic myocardial responses. This atrial fibrillation may diminish the pre-load and effectiveness of the cardiac contraction that can lead to the development of micro emboli due to stagnant blood flow from the atria. In some cases a-fib, leads to a rapid ventricular response secondary to a re-entry problem. A-fib is indicated by an irregular rhythm with QRS's where the P-waves are not present with only fibrillatory waves present for the atrial activity.