What are causes of bradycardia?

Many: 1. Medications 2. High vagal tone as is present in lance armstrong 3. Conduction system disease 4. Infections/endocarditis with a ring abscess 5. Sick sinus syndrome 6. Atrio-ventricular conduction delay 7. Abnormal electrolytes (high potassium 8. Kindey failure.

It depends: Bradycardia indicates that the heart rate is too slow (< 60 BPM in adults). It may be associated with a normal electrical impulse (such as sinus bradycardia in a well-trained athlete or during sleep) or an arrhythmia (abnormal electrical impulse). Some of the more common abnormal rhythms associated with bradycardia include atrioventricular block, sick sinus syndrome, and junctional rhythm.