The mechanism of the benefits achieved with the therapy has been attributed to resynchronization of the dyssynchronous segments resulting from bundle branch block, especially left bundle branch block ...

There is regular rhythm at a rate of 42 beats/min. The first five QRS complexes are wide (0.14 sec), and no P waves are seen before or after these QRS complexes; however there appears to be a P wave ...

ORLANDO, Fla. — Cardiac resynchronization therapy may be detrimental in patients with right bundle branch block and a very wide QRS duration, defined as 180 ms or more, according to findings presented ...

The electrocardiogram (ECG) is a valuable tool for assessing the cardiac conduction system. The measurements routinely obtained with ECG include heart rate, PR interval, QRS duration and the QT ...

Bidirectional ventricular tachycardia is quite rare, but pathognomonic for digoxin toxicity. This ECG has two distinct QRS morphologies alternating every other beat. The QRS complex duration is ...

QRS Duration Independently Tied to Risk of Sudden Cardiac Death Prolonged QRS duration is associated with an increased risk of sudden cardiac death (SCD). (HealthDay News) – Prolonged QRS duration is ...

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 ...