The ECG shows an irregularly irregular rapid ventricular rate, approximately 120 beats per minute, with no visible P waves. The frontal plane QRS axis is –30° and the R wave voltage in AVL is 15 mV.

The ECG shows normal sinus rhythm with prominent P waves in II-III-AVF. The QRS duration is about 0.1 sec with a frontal plane axis of about –60° and small R waves in the inferior leads. The QRS ...

The diagnosis is atrial flutter with 2:1 atrioventricular (AV) block, right bundle branch block, and old inferior wall myocardial infarction (Figure 2). There is a regular rhythm at a rate of 150 ...