P5376Tentative screening criteria for short QT interval among children and adolescents

Criteria for short QT interval based on a new QT-heart rate adjustment formula

BACKGROUND A short QT interval, within which an increased risk for atrial fibrillation and/or fatal cardiac arrhythmias occurs, has been difficult to define. METHODS The lower percentiles of a new QTc formula were determined, using a precise mathematical fitting of the QT-heart rate relationship from the ECGs of 13,600 individuals from the NHANES II and III surveys. RESULTS The QTc interval...

Correction of the QT interval in children.

We evaluated the usefulness of 11 formulas for correcting the QT interval in children, including the square root, cubic root, logarithmic, linear, exponential, and inverse formulas using the Mean-squared residual (MSR) values and Akaike Information Criterion (AIC) in 8,086 first-graders, 9,989 seventh-graders, and 5,786 tenth-graders. The subjects were divided into six groups according to age a...

QT Interval and QT Variability

Proposed diagnostic criteria for short QT syndrome are badly founded.

account for the increase in both VF and acute HF risk in patients presenting with STE in lead V4R. The interventricular septum is nown to play an important role in arrhythmias after myocardial nfarction (1). Morita et al. (2) demonstrated that acute ischemia f the interventricular septum in canine cardiac wedge preparations roduced asymmetric suppression of conduction velocity in the eptum, and...

Screening for Hypertension in Children and Adolescents

BACKGROUND AND OBJECTIVE: The prevalence of hypertension is in­ creasing in children, and may persist into adulthood. This systematic review was conducted for the US Preventive Services Task Force rec­ ommendation on the effectiveness of screening asymptomatic children and adolescents for hypertension in order to prevent cardiovascular disease. METHODS: Eligible studies were identified from Med...