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The Measurement of the QT Interval [PDF]
Current Cardiology Reviews, 2014 The evaluation of every electrocardiogram should also include an effort to interpret the QT interval to assess the risk of malignant arrhythmias and sudden death associated with an aberrant QT interval. The QT interval is measured from the beginning of the QRS complex to the end of the T-wave, and should be corrected for heart rate to enable comparison
Postema, Pieter G., Wilde, Arthur A. M.
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Journal of Human Hypertension, 2000 QT interval has been determined in 103 monozygotic (MZ) and 198 dizygotic (DZ) female twins. Mean values of corrected QT (QTc) were almost identical for both groups at 413 ms (MZ) and 412 ms (DZ). There was a significant age and environmental effect on QT interval. Heritability explained about 25% of the variation in QT.
N, Carter +6 more
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QTc evaluation in patients with bundle branch block
International Journal of Cardiology: Heart & Vasculature, 2020 Proper measurement of the QT interval on the 12-lead body-surface ECG is challenging in daily practice. Even more difficult is its correct estimation in the presence of repolarization abnormalities, arrhythmias or bundle-branch blocks (BBB).
Harilaos Bogossian +9 more
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Effect of age and gender on QT interval
National Journal of Physiology, Pharmacy and Pharmacology, 2018 Background: The sudden cardiac death syndrome has a large preponderance in men compared to women and that too in older age group. Various population studies have demonstrated four- to seven-fold increase of sudden cardiac death among men compared with ...
Sudeep Satpathy +2 more
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Recent heart rate history affects QT interval duration in atrial fibrillation. [PDF]
PLoS ONE, 2017 QT interval prolongation is associated with a risk of polymorphic ventricular tachycardia. QT interval shortens with increasing heart rate and correction for this effect is necessary for meaningful QT interval assessment.
Fady S Riad +4 more
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Coffee, alcohol, smoking, physical activity and QT interval duration: results from the Third National Health and Nutrition Examination Survey. [PDF]
PLoS ONE, 2011 Abnormalities in the electrocardiographic QT interval duration have been associated with an increased risk of ventricular arrhythmias and sudden cardiac death.
Yiyi Zhang +5 more
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Evaluation of differences in automated QT/QTc measurements between Fukuda Denshi and Nihon Koden systems. [PDF]
PLoS ONE, 2014 Automatic measurement becomes a preference, and indeed a necessity, when analyzing 1000 s of ECGs in the setting of either drug-inducing QT prolongation screening or genome-wide association studies of QT interval.
Motoaki Sano +7 more
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Sex and Rate Change Differences in QT/RR Hysteresis in Healthy Subjects
Frontiers in Physiology, 2022 While it is now well-understood that the extent of QT interval changes due to underlying heart rate differences (i.e., the QT/RR adaptation) needs to be distinguished from the speed with which the QT interval reacts to heart rate changes (i.e., the so ...
Irena Andršová +10 more
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The importance of the epinephrine provocation test for the hidden type-1 congenital long QT syndrome
Türk Kardiyoloji Derneği Arşivi, 2020 Congenital long QT syndrome (LQTS) is a genetic channelopathy associated with a high incidence of sudden cardiac death in children and young adults. QT interval prolongation is typically the primary finding on the electrocardiography (ECG) recordings ...
Adem Atici +3 more
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The effects of peritoneal dialysis on QT interval in ESRD patients
BMC Nephrology, 2022 Background Patients with chronic kidney disease (CKD) are at a high risk of fatal arrhythmias. The extended corrected QT (QTc) interval is a hallmark of ventricular arrhythmias and sudden cardiac death.
Wenjing Zhang +4 more
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