What is ‚ÄčLong QT Syndrome (LQTS)?

Also known as: long Q-T syndrome, LQTS

There are many different types of abnormal heart rhythms, or arrhythmias. Long QT syndrome is an electrical problem of the heart that can lead to potentially dangerous arrhythmias which can present with a fainting spell, seizure or even sudden death.  It gets its name from an abnormal pattern on an EKG, which is a test of the heart’s electrical system.


Reviewed by: Jack Wolfsdorf, MD, FAAP

This page was last updated on: 1/29/2019 3:21:13 PM

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