Figure legend
Figure 1. Wide QRS complex tachycardia with predominantly right bundle
branch block (RBBB) morphology, but with some beats with left bundle
branch block (LBBB) pattern, and some being blocked to the ventricles.
Figure 2. Last atrial paced beat inducing tachycardia (A). Wide complex
tachycardia (B).
Figure 3. Atrioventricular nodal reentrant tachycardia (AVNRT) with
cycle length variation based on H-H interval change. The H-A interval is
fixed (linking H-A), but A-H interval varies because antegrade
conduction is moving between more than one slow pathway and this
determines the A-A interval variation.