At Arizona Heart Rhythm Center, we care for patients having problems with their heart's rhythm and its electrical signaling. There are many different forms of arrhythmias, or abnormal heart rhythms. These include tachycardia (heart beats too fast), bradycardia (heart beats too slow), atrial fibrillation, supraventricular tachycardia, Wolfe Parkinson White syndrome, ventricular tachycardia, neurocardiogenic (syncope) and other complex arrhythmias.