<prompt> Answer this question truthfullyWhat does the term QT syndrome mean?  <response>: <reason> Short QT syndrome is a rare autosomal dominant inherited disease of the electrical conduction system of the heart. It is defined by short QT intervals 360 ms that increases an individual propensity to atrial and ventricular tachyarrhythmias. It occurs due to gain-of-function mutations in genes encoding for cardiac potassium channels KCNH2, KCNQ1 and KCNJ2. The shortened QT interval does not significantly change with heart rate, and there are tall and peaked T waves in the right precordium. It is associated with an increased risk of atrial fibrillation, syncope and sudden death. 