The correct diagnosis is atrial rhythm with AV dissociation and accelerated junctional rhythm (Figure 2). Figure 2. Courtesy of Philip J. Podrid, MD. The rhythm is regular at a rate of 96 beats/min, ...

The RR intervals are regular (┌┐), at a rate of 90 beats/min. The QRS complexes are narrow and have a normal morphology and axis, so they are supraventricular. P waves are not seen initially, but a ...