torsades de pointes symptoms
Symptoms of long QT syndrome. There are usually no physical signs of long QT syndrome, and some people don't experience any symptoms. The most common symptoms are blackouts or seizures caused by the interruptions to the heart's rhythm. Some people with long QT syndrome find that their heart sometimes suddenly beats in an abnormally fast, uncontrollable way. This type of arrhythmia is called torsade de pointes.