The first QRS complex is narrow and supraventricular (*). It is followed by a rapid and irregular rhythm with a rate of up to 300 beats/min. The QRS complexes are unusual and show marked variability ...
The diagnosis is sinus rhythm, PVCs and echo beats (complexes). The rhythm is irregular but there is a repeating pattern (group beating) with three QRS complexes and a pause. Therefore, the rhythm is ...
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