Use of the rate-corrected JT interval for prediction of repolarization abnormalities in children

摘要: A prolonged rate-corrected QT interval (QTc) may be associated with an increased risk of developing ventricular arrhythmias and sudden death, particularly in patients the hereditary long syndrome (LQTS), myocardial ischemia, or antiarrhythmic medication toxicity. It is known that there are some LQTS who sometimes have a borderline normal QTc (< = 0.45 second). Although has been standard measurement repolarization, it includes both depolarization repolarization not always sensitive indicator type abnormalities seen LQTS. Intraventricular conduction complicate evaluation interval. The JT (JTc) more accurate therefore means assessing abnormalities. on resting electrocardiogram was determined 40 31 right bundle branch block after tetralogy Fallot repair. These were compared 1,000 age-matched control subjects. group had JTc measurements, despite having intervals controls. identified 85% affected only 58% using as marker for syndrome. specific than by eliminating QRS duration variability. appears to predictor abnormalities, helpful identifying measurements electrocardiograms.