Third Degree AV Block aka Complete Heart Block
• In sinus rhythm with complete AV block, the PP and RR intervals are regular but the P wave has no relationship with the R wave.
• The PR interval varies because there is really no P and QRS relationship.
• The ventricular rate is usually 40-60 bpm and narrow when it is driven by a junctional pacemaker (AV node).
• The QRS is wide and less the 40 bpm when an infra-Hisian pacemaker takes over.
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