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Atrial Fibrillation with Coarse Fibrillatory Waves

Description

The rhythm is atrial fibrillation and the ventricular rate is approximately 70/min. Very prominent irregularly occurring fibrillatory waves are visible. These coarse fibrillatory waves (amplitude 1 mm or greater) can limit ECG interpretation because they can mimic P waves. In this example, interpretation of the QRS complexes is limited. Poor R wave progression is present; however, it is impossible to determine whether criteria for a prior anteroseptal and anterior infarct are present because these coarse fibrillatory waves obscure the beginning of the QRS complexes in leads V2 and V3.

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