The mean longest QTc in the QT prolongation group was 492 ± 27.2 ms (range 462–600), and in the normal QT group was 431 ± 25.7 ms (294 – 471). Baseline characteristics are described in Table 1. Patients with QTc prolongation were older (mean age 67 versus 60 years, P ...
The normal range of the QT/QTc intervalin adults varies between 350 ms and 470 ms or greater (for men) and 480 ms or greater (for women). Both short andlong QT intervalscan cause a variety of life-threateningventricular arrhythmias. Other authors consider a QTc “borderline” value to be...
QTc was prolonged and equal for men (0.471) and women (0.469). Observer variability of under 2% permitted averaging of QT measurements. Composite mean QTd was 55 ms. The literature revealed a range of QTd in normal subjects of 39 to 59 ms (mostly 49 to 59 ms). Patient series with ...
Results Baseline Characteristics A total of 19 955 ECGs from 6881 adult patients (3055 women [44.4%], 3826 men [55.6%]) were identified from January 2010 through April 2020. Median (IQR) age at first ECG was 60 (47-68) years (range, 18-100 years). The median (IQR) number of ECG...
Several formulae, the Bazett, Fridericia, Framingham and Hodges formulae, correct QT (QTc) for heart rate variability and an interval of 4450 ms for men and 460 ms for women is generally accepted as upper limit of normal (Bazett, 1920; Fridericia, 1920; Hodges et al, 1983; Sagie et al...
The lower limit of each range is included in the range, while the upper limit is not. Full size image The results of 7 two-way ANCOVAs are shown in Table 2. There were no significant interaction effects in any test. Gender was a singnificant factor in three tests (when diagnosis, ant...
(Italy) reported that a heart rate-cor- rected QT time according to the Bazett formula (QTc-Bazett) in former extremely low birth weight (ELBW) infants in young adulthood (mean age 23 years) was at the upper limit of the normal range and correlated with gestational age. Relevant for...
for a global QT/ QTc measurement using the Philips 12-lead from its evaluation. analysis algorithm at the Information Center. • Automated continuous QT/QTc interval analysis Introduction using all user specified leads. The goals of ECG monitoring in the hospital setting include: - The ...
). Several formulae, the Bazett, Fridericia, Framingham and Hodges formulae, correct QT (QTc) for heart rate variability and an interval of >450 ms for men and 460 ms for women is generally accepted as upper limit of normal (
Risk for life-threatening cardiac events in patients with genotype-confirmed long-QT syndrome and normal-range corrected QT intervals. This study was designed to assess the clinical course and to identify risk factors for life-threatening events in patients with long-QT syndrome (LQTS) wit... I...