2022年12月26日 · QTc is prolonged if it is greater than 440 ms in men or greater than 460 ms in women. A QTc greater than 500 is associated with an increased risk of torsade de pointes. …

From a screening perspective, a QTc value ≥470 ms for a 2–4-week-old infant screening programme or a QTc ≥500 ms in adolescents/adults may represent far more optimal “penalty …

2018年8月23日 · In this study, we present the results of a large cohort of LQTS patients and controls with a comprehensive evaluation of QTc cutoff values specified for QT interval …

2019年6月10日 · To this end, a prolonged QTc, defined as a QTc value >450 ms in males and >460 ms in females measured preferably in lead II or V 5 on a standard 12-lead ECG, …

The Corrected QT Interval (QTc) adjusts the QT interval correctly for heart rate extremes.

This online evidence based resource will help guide you how to measure the QT interval and calculate the QTc value with an easy to use calculator which takes into account the patients …

This review discusses the components of accurate QTc measurement and diagnosis, re-examines what is known about factors affecting QT interval measurement, and clarifies current …

2023年11月23日 · QT间期延长的原因可以是先天性和遗传的常染色体显性变异，也可以是短暂的和获得性的，通常是因为服用可延长QT间期轻的药物或电解质异常所致。 在临床上，该如何 …

2024年5月9日 · A maximum QTc threshold of 520 ms and median QTc threshold of 490 ms were determined to be strong predictors for BCEs. A landmark analysis controlling for age, sex, …

At extremes of Heart Rate the Hodges correction may perform better than Bazett correction. Upper limit of normal is usually defined as 440 msec. A QTc >540 msec confers a 1.7x …