Comparison of formulas for calculation of the corrected QT interval in infants and young children.
摘要：
To compare 4 heart rate correction formulas for calculation of the rate corrected QT (QTc) interval among infants and young children. R-R and QT intervals were measured from digital electrocardiograms. QTc were calculated with the Bazett, Fridericia, Hodges, and Framingham formulas. QTc vs R-R graphs were plotted, and slopes of the regression lines compared. Slopes of QTc-R-R regression lines close to zero indicate consistent QT corrections over the range of heart rates. We reviewed electrocardiograms from 702 children, with 233 (33%) <1 year of age and 567 (81%) <2 years. The average heart rate was 122 ± 20 bpm (median 121 bpm). The slopes of the QTc-R-R regression lines for the 4 correction formulas were -0.019 (Bazett); 0.1028 (Fridericia); -0.1241 (Hodges); and 0.2748 (Framingham). With the Bazett formula, a QTc >460 ms was 2 SDs above the mean, compared with "prolonged" QTc values of 414, 443, and 353 ms for the Fridericia, Hodges, and Framingham formulas, respectively. The Bazett formula calculated the most consistent QTc; 460 ms is the best threshold for prolonged QTc. The study supports continued use of the Bazett formula for infants and children and differs from the use of the Fridericia correction during clinical trials of new medications.
收起
展开
DOI：
10.1016/j.jpeds.2014.12.037
被引量：
年份：
1970
ResearchGate
(全网免费下载)
钛学术
(全网免费下载)
通过 文献互助 平台发起求助，成功后即可免费获取论文全文。
求助方法1：
知识发现用户
每天可免费求助50篇
求助方法1：
关注微信公众号
每天可免费求助2篇
求助方法2：
完成求助需要支付5财富值
您目前有 1000 财富值
相似文献(240)
参考文献(28)
引证文献(27)
来源期刊
影响因子：暂无数据
JCR分区： 暂无
中科院分区：暂无
