Atrial arrhythmic definitions:
Atrial fibrillation
Disorganized arrhythmia with an atrial rate greater than 250 bpm and ventricular morphology
similar to the baseline electrocardiogram.
Atrial flutter
A regular arrhythmia with sudden onset, an atrial rate greater than 250 bpm and ventricular
morphology similar to the baseline electrocardiogram. Usually A>V .
Sinus tachycardia
A regular rhythm without sudden onset and with an atrial rate greater than 100 bpm and
ventricular morphology similar to the baseline electrocardiogram. A-V ratio 1:1.
Atrial tachycardia
Usually sudden onset with a constant regular atrial morphology and an atrial rate more than 170
bpm but less than 250 bpm. Ventricular morphology similar to the baseline electrocardiogram.
Usually more atrial beats than ventricular beats. If same amount of atrial and ventricular beats
then atrial rate drives ventricular rate with the first event being an atrial beat.
Atrio-ventricular nodal reentry tachycardia
A sudden onset atrial arrhythmia with a regular atrial rate less than 250 bpm and a constant atrial
morphology. Atrial signals closely timed with ventricular signals and a ventricular morphology
similar to the baseline electrocardiogram. A-V ratio 1:1 but may start with a long A-V time.
Atrio-ventricular reentry tachycardia
A sudden onset atrial arrhythmia with a regular atrial rate less than 250 bpm and a constant atrial
morphology. Atrial signals occur after ventricular signals with A-V ratio 1:1 and a ventricular
morphology similar to the baseline electrocardiogram.
Supraventricular tachycardia of undefined type
An atrial arrhythmia with an atrial rate more than 170 bpm but less than 250 bpm and usually AV ratio 1:1. Ventricular morphology similar to the baseline electrocardiogram.
(The minimal duration for the documentation of an episode by the device was > 5 seconds.)
Endpoints used in the manuscript:
Atrial tachyarrhythmias included atrial fibrillation, atrial flutter, atrial tachycardia, atrioventricular nodal reentry tachycardia, atrio-ventricular reentry tachycardia, supraventricular
tachycardia of undefined type and sinus tachycardia
Non-arrhythmic events included ICD lead noise, myopotentials, electromechanical interference,
T wave-, pacemaker stimuli- and other oversensings.
Non-atrial arrhythmic events included ICD lead noise, myopotentials, electromechanical
interference, T wave-, pacemaker- and other oversensing, non-sustained ventricular tachycardia
and premature ventricular complexes.
Other inappropriate arrhythmic events included non-sustained ventricular tachycardia and
premature ventricular complexes.