The rhythm is irregularly irregular (ie no consistency to the RR intervals). There are three supraventricular rhythms that are irregularly irregular: Sinus arrhythmia, in which there is one P wave ...

The correct diagnosis is wandering atrial pacemaker/multifocal atrial rhythm (Figure 2). The rhythm is irregularly irregular at a rate of 90 beats/min. The QRS complexes are narrow with a normal axis, ...

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Atrial fibrillation with a rapid ventricular response Left bundle branch block This ECG is considered "SVT with aberrancy" due to the atrial fibrillation with a fast ventricular rate and a wide QRS ...