Electrocardiogram alone or with echocardiogram had high negative predictive value, but had varied positive and false-positive predictive rates for detecting pediatric sudden cardiac death, according to a meta-analysis in the journal Pediatrics. For hypertrophic cardiomyopathy, long QT syndrome and Wolff-Parkinson-White syndrome, researchers noted that the summary phenotypic prevalence rates were 45, seven and 136 per 100,000 asymptomatic children, respectively.

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