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AF
See Atrial fibrillation
Antitachycardia pacing
A way of treating ventricular tachycardia (an abnormally fast heartbeat) by stimulating the heart with a rapid series of electrical pulses which re-establish a normal heartbeat. These rapid series of electrical pulses are preset.
Arrhythmia
An abnormal heart rhythm.
Atrial fibrillation (AF)
Abnormally fast and irregular electrical activity of the atria, this common arrhythmia can make the ventricles beat irregularly, and sometimes rapidly. Atrial fibrillation is not acutely dangerous, and is often not even noticed by patients. However, a rapid heart rate can sometimes cause palpitations, dizziness, and shortness of breath.
Atrioventricular (AV) node
A specialized part of the heart that is normally the only electrical connection between the atria and the ventricles. If the AV node does not function properly, your pacemaker or ICD can take over by pacing the ventricle in the appropriate rhythm with the atrium.
Atrium
The left and right atria are the upper chambers of the heart. The right atrium pumps blood into the right ventricle. The left atrium pumps blood into the left ventricle.
AV delay
Period of time between the atrial activation and the ventricular activation.
AV node
See Atrioventricular node