Just so, is there a difference between atrial fibrillation and tachycardia?
Atrial fibrillation (or “a-fib”) is very similar to superventricular tachycardia (SVT). Both conditions affect the atria of the heart. The difference rests in the regularity of the heartbeat. SVT is a fast, regular heartbeat; a-fib is a fast, irregular heartbeat.