Classic svt (supraventricular tachycardia
) also known as av nodal reentrant tachycardia, is a condition in which there is an extra "wire" connecting the top and bottom parts of the heart
, leading to "short circuits" and intermittent rapid heart rhythms.
However, svt can also be used to describe any fast heart rhythm coming from the top part of the heart. These can be normal or abnormal rhythms.