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Second Degree Heart Block, Mobitz Type I (Wenckebach) P waves and QRS complexes are normal but... • PR interval progressively lengthens • Dropped beats (non-conducted P wave) • Leads to "grouped beating" • The block almost always within the AV node #Mobitz #Type1 #Type1 #SecondDegree #HeartBlock #Diagnosis #Cardiology #EKG #ECG #Electrocardiogram #Wenckebach