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Postural tachycardia syndrome (PoTS) is an abnormal increase in heart rate after sitting or standing up.
Our Health A-Z contains more information on Postural tachycardia syndrome.
Supraventricular tachycardia (SVT) is the name given to an abnormality of heart rhythm, characterised by a fast heartbeat.
Our Health A-Z contains more information on SVT.
Important: If you have these symptoms, they may be unrelated to any of these conditions listed. If you are concerned about your symptoms then you should see a doctor.