Objective To determine the normal values of QT and QTc dispersion and the effects of sinus arrhythmia on QT dispersion in healthy children. Patients and setting The study was carried out in a university hospital on 372 local schoolchildren (200 male, 172 female), aged seven to 18 years. ...
ponential, logarithmic, and linear formulae have been used 1 (Table 1). To assess the performance of a particular heart rate correction formula, the correlation between the corrected QT (QTc) intervals calculated using the formula and the RR in- tervals can be assessed. If it differs from ...
The QT interval is an electrocardiographic measure representing the sum of ventricular depolarization and repolarization, estimated by QRS duration and JT interval, respectively. QT interval abnormalities are associated with potentially fatal ventricular
QT/QTc Interval Monitoring ST/AR Algorithm IntelliVue Patient Monitor and Information Center, Application Note • Electronic caliper assisted QT/QTc This application note describes principles and uses of measurements can be performed manually on any stored ECG waveform. QT interval monitoring. It also...
Many formulas are used to correct QT interval for heart rate. The Bazett formula (QTc=QT/RR½) is one of them. • NormalQTc intervalis 350–450ms in males and 360–460ms in females. • QTdis the difference between the longest andshortest QT intervalon standard ECG. ...
结论长/短QTc在健康人群存在两个年龄高峰,30～39岁是短QTc出现率高峰,50岁后是长QTc出现率高峰,对于这两个年龄组需重点关注QTc变化,防止心血管事件发生。 关键词: 心电图;长校正QT间期;短校正QT间期 ABSTRACT ObjectiveTo explore the incidence and clinical significance of long/short corrected QT interval (QT...
QT (QTc) Prolongation and Monitoring Primer QT (QTc) Prolongation is associated with many psychotropic medications (especially antipsychotics) and some are linked to serious ventricular arrhythmias (e.g. - Torsades de Pointes) and sudden cardiac death.
generally the Bazett. The algorithms generally provide the means and range of the QT and QTc interval and allows the identification ofpeaks of prolonged QTc interval; that is, the proportion of QTc intervals above a given threshold (eg, QTc >500 ms). Abnormal circadian patterns ofprolonged QT...
The QT and preceding RR intervals from three sinus beats on a standard 12-lead ECG were measured. The QTc was calculated with the Bazett method, and the values were averaged. Thirty-seven patients met inclusion criteria. Five had event histories concerning for possible underlying rhythm ...
Values are n (%) or median (interquartile range). Abbreviations as in Table 1. ∗ Patients with LQTM had a significantly higher median QTc interval compared with patients with LQT1 (p = 0.02). † Patients with LQT1 were significantly less symptomatic compared with the rest (p = 0.002...