Short QT Syndrome

What is a QT

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The QT is an interval (QT interval) in the ECG representing the duration of the electrical activity in the lower chambers during a single heartbeat, and it is measured from the beginning of the QRS wave(s) to the end of the T wave:

The duration of the QT-interval varies dependent upon how fast the heart is beating, but in normal healthy people, when the heart is beating 60 beats per minute, it is between 350 and 440 milliseconds. In patients with Short QT Syndrome it is less than that somewhere between 210 and 340 milliseconds.

Patients with Short QT Syndrome does not only have a short QT interval at a heart rate of 60 beats per minute, but in contrast to healthy people, where the QT interval varies with heart rate ( getting longer as the heart rate gets slower and shorter as the heart rate gets faster), their QT interval always stays the same.

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