A first-degree, or 1 st degree, AV block is indicated on the ECG by a prolonged PR interval ... The PR interval is normally between 0.12 and 0.20 seconds. A PR interval consistently longer ...
Sinoatrial exit block occurs when the action potential ... This is not recognizable on the 12-lead ECG because the time that SA node fires is not able to be determined. The ECG may simply show ...
The ability to identify an abnormality on the 12-lead ECG ... up to 60% of athletes demonstrate ECG changes (in isolation or in combination) such as sinus bradycardia, sinus arrhythmia, first-degree ...
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