The rhythm is regular at a rate of 78 beats/min. Before each QRS complex, there are two pacing stimuli (+,v) with a very short interval (0.06 sec) between them. They are both ventricular pacing ...
The correct diagnosis is sinus tachycardia (Figure 2). The rhythm is regular at a rate of 120 beats/min, and a single premature complex is seen (^). The QRS complexes are wide (0.18 sec). An RSR' ...