The correct diagnosis is atrial flutter with 2:1 atrioventricular (AV) block (Figure 2). Figure 2. Courtesy of Philip J. Podrid, MD. The rhythm is regular at a rate of 150 beats/min. The QRS complex ...
The QRS complexes are narrow and have a normal morphology. The axis is physiologically leftward with a positive QRS complex in lead I and II, and negative in lead aVF. The QRS complex voltage is low ...
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