Sinus bradycardia occurs on an ECG when there is a normal upright P wave in lead II (sinus P wave) preceding every QRS complex with a ventricular rate of less than 60 beats per minute. Frequently ...

Sinus bradycardia occurs on an ECG when there is a normal upright P wave in lead II ― sinus P wave ― preceding every QRS complex with a ventricular rate of less than 60 beats per minute.

Sinus bradycardia is defined as a heart rate of <60 beats/min ... The QRS rate for junctional rhythms is typically less than 100 beats/min, and the QRS complex usually narrow unless the baseline QRS ...

Studies investigating QRS-complex abnormalities in association ... atrial fibrillation and sinus bradycardia). Including studies on neonates, only one study investigating rhythm disturbances ...