Sinus bradycardia, or a slow heart rate, can be a sign of cardiovascular health in healthy young adults and endurance athletes. It can also be a sign of an underlying condition requiring medical ...

The rhythm is either sinus rhythm or not sinus rhythm. Sinus rhythm refers to the origination of the electrical activity coming from the sinus node — also known as the sinoatrial node, or SA node.

Background: Symptomatic prolonged sinus pauses on termination of atrial fibrillation (AF) are an accepted indication for pacemaker implantation. We evaluated the outcome of AF ablation in patients ...

A premature atrial contraction occurs when a focus in the atrium (not the sinoatrial node) generates an action potential before the next scheduled SA node action potential. There are four main ...

Before catheter ablation or pacemaker implantation, all patients in both groups actually met the criteria for permanent pacing due to symptomatic prolonged sinus pauses on termination of AF (Fig.