what is the difference between atrial fibrillation and supraventricular tachycardia?
Supraventricular arrhythmias begin in the areas above the heart's lower chambers, such as the upper chambers (the atria) or the atrial conduction pathways. Generally, supraventricular or “atrial arrhythmias” are not as serious as ventricular arrhythmias. Sometimes, they do not even require treatment.