TY - JOUR
T1 - Beat-to-beat QT interval variability in children
T2 - Normal and physiologic data
AU - Kusuki, Hirofumi
AU - Kuriki, Marina
AU - Horio, Kayo
AU - Hosoi, Misa
AU - Matsuura, Hideaki
AU - Fujino, Masayuki
AU - Eryu, Yoshihiko
AU - Miyata, Masafumi
AU - Yasuda, Toshiaki
AU - Yamazaki, Toshio
AU - Nagaoka, Shunji
AU - Hata, Tadayoshi
PY - 2011/5
Y1 - 2011/5
N2 - 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, 106:67) 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.
AB - 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, 106:67) 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.
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U2 - 10.1016/j.jelectrocard.2010.07.016
DO - 10.1016/j.jelectrocard.2010.07.016
M3 - Article
C2 - 20863513
AN - SCOPUS:79955063147
SN - 0022-0736
VL - 44
SP - 326
EP - 329
JO - Journal of Electrocardiology
JF - Journal of Electrocardiology
IS - 3
ER -