Heart: Supraventricular Tachycardia (SVT)
Supraventricular tachycardia (SVT) is a general name for arrhythmias that start above the ventricles. It is sometimes called paroxysmal supraventricular tachycardia (PSVT) because it occurs intermittently, or from time to time.
SVTs usually begin and end suddenly, and can last anywhere from seconds to hours. They may cause the heart to beat 160-200 times a minute.