The rhythm is regular at a rate of 120 beats/min. A pacemaker stimulus occurs before each QRS complex (→). This is ventricular pacing. Because the pacing rate is 120 beats/min, the mode of pacing must ...
The correct diagnosis is sinus rhythm, premature ventricular complexes, and echo complexes (Figure 2). The rhythm is irregular but has a repeating pattern of group beating, with three QRS complexes ...
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