First-degree AV block shows a prolonged but constant PR interval with every P wave conducted; second-degree Mobitz I (Wenckebach) shows progressively lengthening PR intervals until a beat is dropped; Mobitz II shows a sudden dropped QRS without preceding PR prolongation and carries higher risk of progression to complete block; third-degree (complete) heart block shows complete dissociation between P waves and QRS complexes, each marching to its own independent rate.
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