The correct diagnosis is atrial flutter with variable block (Figure 2). The rhythm is regular at a rate of 150 beats/min; however, there are two long RR intervals (↔). The QRS complex is narrow (0.08 ...

This ECG has a narrow QRS complex, a fast heart rate, regular rhythm and no identifiable P wave activity. It is likely that the P wave is buried in the QRS complex and the rhythm is junctional in ...

The correct diagnosis is Wenckebach with junctional escape beats (Figure 2). Figure 2. Courtesy of Philip J. Podrid, MD. The rhythm is irregular, but there is a pattern because many of the RR ...

Postural orthostatic tachycardia syndrome (POTS) is a chronic multisystem disorder; the cardinal feature is orthostatic tachycardia. Patients with POTS have symptoms of orthostatic intolerance that ...