Atrial tachycardia and other ectopic atrial rhythms occur when a site outside of the sinus node, but within the atria, creates action potentials faster than the sinus node. This ectopic focus ...

If a premature atrial contraction occurs when the AV node ... and there will not be a QRS complex afterwards (or the ectopic PR interval will be prolonged, as in the second QRS complex on this ...

higher automaticity – ectopic beats; and re-entry – atrial tachyarrhythmia; and higher vulnerability to arrhythmia – heart rate and its variability. Most of these predictors are not ready ...