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Long QT syndrome (LQTS) is a condition affecting repolarization (relaxing) of the heart after a heartbeat, giving rise to an abnormally lengthy QT interval. [7] . It results in an increased risk of an irregular heartbeat which can result in fainting, drowning, seizures, or sudden death. [1] .
An abnormally prolonged QT interval could be due to long QT syndrome, whereas an abnormally shortened QT interval could be due to short QT syndrome. The QTc length is associated with variations in the NOS1AP gene. [21]
Left axis deviation is a border deviation in athletes, which, if it is combined with another borderline feature such as right bundle branch block, requires further investigation in view of increased risk of sudden cardiac death.
19 lip 2024 · Long QT syndrome (LQTS) is a heart rhythm disorder that causes fast, chaotic heartbeats. The irregular heartbeats can be life-threatening. LQTS affects the electrical signals that travel through the heart and cause it to beat.
21 wrz 2022 · Before puberty, a QTc <450 ms is considered normal, between 450 and 459 borderline, and ≥460 prolonged. After puberty in males, a QTc between 460 and 469 is borderline and ≥470 is considered prolonged. In post-pubertal females, 460 to 479 is borderline and ≥480 ms is considered prolonged.
22 gru 2023 · Normal QT interval: 0.35–0.44 seconds; Borderline QT interval: 0.44–0.46 seconds; Prolonged QT interval: More than 0.46 seconds
When the QT interval is longer than normal, it increases the risk for Torsades de Pointes, a life-threatening form of ventricular tachycardia. Long QT syndrome has acquired and inherited forms. The types you can inherit (congenital forms) include: Ion channel abnormalities. The most common of these types include LQT1, LQT2, LQT3, LQT4 and LQT5.
