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. ...
QT/QTc Intervals The QT interval is measured from the beginning of the QRS complex to the end of the T wave (Fig. 3.8). It primarily represents the return of stimulated ventricles to their resting state (ventricular repolarization). The normal values for the QT interval depend on the heart...
QT/corrected QT (QTc) intervals and QT/QTc dispersions in children with chronic renal failure^1 喜欢 0 阅读量: 20 作者:Kocak,G.,Atalay,S.,Bakkaloglu,Ekim,M.,Ercan,Tutar,H.,Imamoglu,A.年份: 1999 收藏 引用 批量引用 报错 分享 全部来源 求助全文 www.ingentaconnect.com 参考文献 引证文献...
QT intervals and heart rate were measured manually digitally on-screen at hourly intervals. The QT-RR relationship was plotted and QTc calculated using the Bazett, Hodges, Fridericia and Framingham formulae. QTc values for each formula were plotted against age and RR interval. Analysis of variance...
(LC)<QT,其中QTc与QT间差异有显著性(P<0.01);SB组,ST组与NS组比较QTc之间存在显著不同(P<0.01),而QT(LC)之间差异无显著性(P>0.05).结果显示:QTc在正常心率范围或窦性心动过速时过度校正QT值使之偏大,在心动过缓时过低校正QT值使之偏小,而QT(LC)基本不受心率变化的影响.并且较接近实际QT值,可作为更...
I'm a 26-year old woman and I'd need some advice regarding my QT values. If I understand correctly, QTc intervals of less than 440 ms are considered to be normal, whereas QTc intervals of 440 ms to 460 ms in men and 440 ms to 470 ms in women are considered borderline. A couple...
Each type of correction formula can give markedly different QTc values. The Bazett correction (which is most commonly used and found in most preprogrammed ECG machines that calculate the QTc), however, it tends to: Overestimate QTc interval in tachycardia Underestimate the QTc interval in ...
Great controversy exists over normal values of QT or the corrected QT (QTc) duration; in the absence of broad QRS complex, the 99th percentile of QTc is 470 ms for men and 480 ms for women. It is generally accepted that a QTc above 500 ms is a high risk factor for Tdp [3]. In...
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...
8-11 Systemic inflammation prolongs QTc via cytokine-mediated effects on potassium channel expression.12 Specific viruses are also associated with QTc prolongation.13-15 Few analyses have compared QTc intervals between patients with and without COVID-19, an inflammatory viral condition. The present ...