The initial part of the ECG shows a regular narrow complex tachycardia at a rate of 160 beats/min. The QRS complex duration is normal (0.08 sec) and there is normal morphology and normal axis between ...

Narrow-complex tachyarrhythmias are rapid heart rhythms originating in the upper heart chambers, characterized by a QRS duration of less than 120 milliseconds on an EKG. These arrhythmias can be ...

This is a narrow QRS complex tachycardia with a very fast heart rate (about 250 beats per minute). It is quite difficult to indentify any P wave activity to determine the exact etiology. Most commonly ...

The diagnosis is nonsustained atrial tachycardia and left ventricular hypertrophy (LVH) with associated ST-T wave changes. There is a regular narrow complex tachycardia at a rate of 240 beats/min. At ...

A 24-year-old woman presents to the emergency department with the sole symptom of “a racing heart,” which began abruptly while she was eating dinner. She reports having had prior episodes of ...

Most wide QRS complex tachycardias (WCTs) are ventricular or supraventricular in origin, but to differentiate between the two can present a diagnostic challenge. To develop and test an algorithm that ...