Why is it called Long QT Syndrome?
The name Long QT Syndrome comes from the measurement of the heart’s contractions by electrocardiogram (EKG or ECG). When the heart contracts, it emits an electrical signal that can be recorded on the ECG. This signal produces a waveform, and different parts of this waveform are designated by letters P,Q, R, S and T. The Q-T interval marks the time for electrical activation and inactivation of the ventricles, which are the lower chambers of the heart. In people with the Long QT Syndrome, the Q-T interval takes longer than normal to occur. It should be noted, however, that tests do not always reveal Long QT Syndrome. People with the disorder do not necessarily have a prolonged Q-T interval all the time, and at the time they have an ECG, the Q-T interval may be normal.
