Narrow QRS complexes occur regularly. This tracing suggests either atrial flutter or ventricular tachycardia. It is not atrial flutter, however. If it were, the QRS complexes occurring regularly would ...

When your electrical system is working normally, the two upper chambers of the heart (atria) contract and pump blood into the two lower chambers (ventricles) in a well-coordinated way. This results in ...

The approval was based on data from 5 randomized, double-blind, placebo-controlled trials that included 317 patients with supraventricular tachycardia. Landiolol is a selective beta-1 adrenergic ...

Atrial tachycardia is a form of supraventricular tachycardia that occurs when one focus in the atria begins to fire rapidly, overwhelming the sinoatrial node. This results in rapid conduction of ...

This ECG has a narrow QRS complex initally, then a fast heart rate, regular rhythm and no identifiable P wave activity which suddenly turns to a wide complex in a left bundle branch block pattern. The ...

Background Endurance exercise training produces multiple cardiac adaptations including changes in electrophysiological function that may make endurance-trained athletes more vulnerable to atrial ...

Background: A 60-year-old male with obesity (body-mass index 43 kg/m 2) presented with recurrent symptomatic atrial fibrillation (AF), which he had had since age 41 years. The AF was refractory to ...