Supraventricular tachycardia (SVT) is any tachycardic rhythm originating above the ventricular tissue. Paroxysmal supraventricular tachycardia (PSVT) is a rapid rhythm of the heart which involves an accessory pathway. This is in contrast to the potentially deadlier ventricular tachycardias, which are rapid rhythms that originate from the ventricles of the heart, that is, below the atrial tissue or atrioventricular (AV) node.Read more on Wikipedia
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