SVT - The supraventricular tachycardias
-

AV node re-entry tachycardia AVNRT
AVNRT is the commonest SVT. It is the cause of the “frog sign” and it can make you feel like your whole body is shaking in time with your heartbeat.
-

AV re-entry tachycardia or WPW
AV re-entry tachycardia - also known as Wolff Parkinson White or WPW - is due to a short circuit in the heart's electrical connections.
-

Atrial tachycardia
Usually, your heartbeat is initiated from a single spot in the heart, but sometimes there is a competing focal point elsewhere which can take over your heartbeat.