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It doesn't stand for words, it refers to parts of the ECG (heart electricity scan - those beeping wiggly lines on the monitors in House!). The 'QRS' complex is the pointy bit that happens when the ventricles of the heart contract, and the T wave is the bump that follows the QRS complex and happens when the ventricles repolarise.
Long QT is a condition where repolarisation is delayed - the T wave is further away from the Q (first downstroke of the QRS complex) than in normal heart function.

What this means for people with the condition is that they are more at risk of dangerous abnormal heart rhythms, especially ventricular fibrillation (VF) which is where the heart goes haywire and can be a cause of cardiac arrest (the heart stopping) and death.
Some medicines, including antibiotics like Bactrim for UTIs, can make your QT interval longer and should be avoided by people with this condition.

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Q: What does the QT stand for in Long QT Syndrome?
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