In general, cardiac arrhythmias are classified into two broad categories: supraventricu-lar (those occurring above the ventricles) and ventricular (those occurring in the ventricles). The names of specific arrhythmias are generally composed of two words; the first word indicates the location of the electrophysiologic abnormality resulting in the arrhythmia (sinus, AV node, atrial, or ventricular), and the second word describes the arrhythmia in terms of whether it is abnormally slow (bradycardia) or fast (tachycardia), or the type of arrhythmia (block, fibrillation, or flutter).
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