As Figure 1 shows, this patient has long-standing 1° AV block -- dating back to 1949. As shown in the diagram in Figure 2, the impulse from the atrium turns around in the AV junction due to dual AV ...

This is a challenging ECG in regards to determining if the wide QRS complex rhythm is from ventricular tachycardia or "SVT with aberrancy" such as AV nodal reentry tachycardia causing a rate-dependent ...

The R12 and R14 waves hold the key to the answer (Figures 2 and 3). These two QRS complexes are narrow and occur slightly earlier than others. They are PJCs and occur late enough to have a sinus P ...