Sinus bradycardia occurs on an ECG when there is a normal upright P ... Heart rates in the 40s and 50s can be tolerated well. When symptoms arise, they manifest as fatigue, dizziness and dyspnea ...

A bifascicular block on ECG is defined by the combination of ... degrees of atrioventricular block in the future causing symptomatic bradycardia and requiring pacemaker implantation.

In fact, up to 60% of athletes demonstrate ECG changes (in isolation or in combination) such as sinus bradycardia, sinus arrhythmia, first-degree atrioventricular (AV) block, early repolarisation, ...

High vagal tone in athletes results in bradycardia and repolarization anomalies on the resting ECG. Bradycardia permits ... investigation in the absence of symptoms, positive family history ...

Whether used for the diagnostic evaluation of cardiovascular-related symptoms, a family history of inheritable cardiac disease or SCD, or for screening of asymptomatic athletes, ECG interpretation ...