Overview

Long QT syndrome (LQTS) is a heart rhythm condition that can potentially cause fast, chaotic heartbeats. These rapid heartbeats might trigger you to suddenly faint. Some people with the condition have seizures. In some severe cases, LQTS can cause sudden death.

Some people are born with a genetic mutation that causes long QT syndrome (congenital long QT syndrome). Long QT syndrome may be caused by certain medications, mineral imbalances or medical conditions (acquired long QT syndrome).

Long QT syndrome is treatable. You might need to avoid or take certain medications to prevent dangerous heartbeat episodes. Sometimes, treatment for long QT syndrome involves surgery or an implantable device.