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.

Hyperkalemia causes peaked T waves initially, then an intraventricular conduction delay with a widened QRS complex, then bradycardia. Eventually a “sine wave” pattern ensues. Hyperacute T ...

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

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 ...