Sinus tachycardia is recognized on an ECG with a normal upright P wave ... has been described and is a form of autonomic dysfunction. Sinus node modification or ablation procedures can be done ...

Sinus arrhythmia refers to a changing sinus node rate with the respiratory cycle ... and decreases with expiration. The ECG criteria to diagnose sinus arrhythmia is a variation of the P-P interval ...

Sinus node dysfunction associated with symptoms is a ... this diagnosis is usually apparent by characteristic ECG patterns. However, ECG patterns are not diagnostic for trifascicular block.

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, ...

The Effects of Aging on the Sinus Node and the Cardiac Conduction System Once the atria are activated, the electrical impulse travels sequentially through the AV node, His bundle, and left and ...