what is atrial tachycardia
Atrial tachycardia is a type of atrial arrhythmia in which the heart 's electrical impulse comes from ectopic atrial pacemaker, that is to say an abnormal site in the upper chambers of the heart or atria, rather than from the SA node which is the normal site of origin of the heart's electrical activity.trial tachycardia is a type of atrial arrhythmia in which the heart 's electrical impulse comes from ectopic atrial pacemaker, that is to say an abnormal site in the upper chambers of the heart or atria, rather than from the SA node which is the normal site of origin of the heart's electrical activity.