The PR interval is the time from the beginning of the P wave (atrial depolarization) to the beginning of the QRS complex (ventricular depolarization). The normal PR interval measures 0.12-0.20 seconds ...

Prolongation of the PR interval by more than 200 ms, which signifies first-degree atrioventricular block, has been found to increase the risk of developing atrial fibrillation, the need for a ...

BOSTON – A common electrocardiogram (ECG) finding that has largely been considered insignificant may actually signal an increased risk of atrial fibrillation (a chronic heart rhythm disturbance), the ...

THE electrocardiographic picture of prolonged QRS-complex duration with short PR interval was the subject of isolated reports 1,2 until Wolff, Parkinson and White 3 described the clinical syndrome of ...

AURICULAR fibrillation is frequent in various forms of heart disease and in thyrotoxicosis, and its occurrence in other conditions is also recognized. 1 Although this arrhythmia is often encountered ...

June 24 -- TUESDAY, June 23 (HealthDay News) -- A slight abnormality in an electrocardiogram (EKG), until now thought to be insignificant, can be a warning sign of future cardiac problems and an ...

Figure 2 shows a regular rhythm at a rate of 90 beats/min. The QRS complex duration is increased (0.14 sec), and there is a morphology of a right bundle branch block with an RSR' morphology in lead V1 ...

Editor's note: Find the latest COVID-19 news and guidance in Medscape's Coronavirus Resource Center. College athletes who have recently recovered from COVID-19 infection show cardiac abnormalities on ...

What is the ECG criteria for a 1st degree AV block? A first degree AV node block occurs when conduction through the AV node is slowed, thus delaying the time it takes for the action potential to ...

One of the strongest clinical associations with autoantibodies against components of the SSA/Ro–SSB/La ribonucleoprotein complex is the development of congenital heart block in an offspring, an ...

A common electrocardiogram finding that has largely been considered insignificant may actually signal an increased risk of atrial fibrillation, the future need for a permanent pacemaker and an ...