EKG rhythm Strips

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Identify the following rhythm.



The answer is: Atrial fibrillation with aberrantly conducted beats.  The rsR' pattern in lead V1 favors aberrancy.  In his book ACLS 2013 Arrhythmias, Dr Ken Grauer states that when there is a RBBB morphology in the V1 lead with a tall R' wave and an S wave that descends below the baseline then the complex favors abberrancy. 

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