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Wolff-Parkinson-White (WPW) - Orthodromic AVRT: Narrow complex, most common - Antidromic AVRT: wide complex because goes through accessory pathway first - A-fib: different QRS morphologies due to the two pathways each signaling ventricles #WolffParkinsonWhite #WPW #Cardiology #ECG #EKG #Electrocardiogram #Clinical #Diagnosis