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. #ThirdDegree #3rd #AVBlock #Complete #cardiology #ekg #ecg #diagnosis #electrocardiogram
