June 23, 2009 (Boston, Massachusetts) — Prolongation of the PR interval in the ambulatory setting is associated with increased risks of atrial fibrillation, pacemaker implantation, and all-cause ...

A PR interval of less than 200 milliseconds is considered normal, and participants whose interval was longer than 200 milliseconds had twice the overall risk of developing atrial fibrillation ...

The electrocardiographic PR interval (or PQ interval) reflects atrial and atrioventricular nodal conduction, disturbances of which increase risk of atrial fibrillation.

Genes in 44 loci identified as associated with the PR interval on an EKG are overrepresented in cardiac disease processes, including heart block, sick sinus syndrome, and atrial fibrillation.

It has been shown by Bruenn 6 and by Keith 7 that prolongation of the PR interval in rheumatic heart disease is almost always due to vagal activity. A study was therefore made of the occurrence of ...