Beat-to-beat QT interval variability in children: normal and physiologic data.
J Electrocardiol
; 44(3): 326-9, 2011.
Article
em En
| MEDLINE
| ID: mdl-20863513
ABSTRACT
BACKGROUND:
QT interval variability provides information on ventricular vulnerability. However, QT interval variability in children has not been adequately evaluated.METHODS:
One hundred seventy-three consecutive nursing infants and children (male-female, 10667) up to school age with no intrinsic cardiac disease were included in this study, and they were categorized into 6 age-related groups. The QT variability index (QTVI) was calculated based on an electrocardiogram; and age-specific standard values, sex-specific classification, and a standard growth curve covering 0 to 7 years were constructed.RESULTS:
The QTVI decreased in an age-dependent manner, reached constant values after school age, and exhibited no sex-specific differences in 6 age-related groups.CONCLUSIONS:
Based on the age-dependent standardized QTVI values, it is possible to estimate the instability of ventricular repolarization in pediatric patients with better accuracy.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Eletrocardiografia
/
Sistema de Condução Cardíaco
Limite:
Child
/
Child, preschool
/
Female
/
Humans
/
Infant
/
Male
Idioma:
En
Revista:
J Electrocardiol
Ano de publicação:
2011
Tipo de documento:
Article