Difference in the QT Intervals between Automated and Manual Measurements

DOI 3 Citations 9 References
  • Yoshinaga Masao
    Department of Pediatrics, National Hospital Organization Kagoshima Medical Center
  • Nagashima Masami
    Department of Pediatric Cardiology, Aichi Children's Health and Medical Center

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  • 自動計測とマニュアル計測でのQT時間の差に関する検討

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Background : QT intervals were manually and automatically measured at the time of the primary screening in school-based cardiovascular screening programs. Using the longest QT interval among 12 leads as the representative QT interval for each individual is recommended, but no data is available regarding the difference in QT interval between manually and automatically measured QT intervals and for the lead (s) with the longest QT interval in the pediatric population. Methods : Subjects were divided into six groups, each consisting 100 children (both males and females) in the 1st, 7th, and 10th graders. QT intervals measured using the tangent line method were compared to the QT intervals automatically measured using the differentiation method in lead V5 in the electrocardiograms that were recorded in the screening program. The lead with the longest QT interval among 12 leads measured automatically was also determined. Results : The automatically measured QT intervals were significantly longer than the manually measured QT intervals in all groups, with the defference ranging from 21 to 26 msec. The longest QT intervals were present in leads V4 and V5 in 1st and 7th graders, and in leads V3 and V4 in 10th graders. Discussion : Screening for QT prolongation should be done recognizing that there is a difference between automated and manually measured QT intervals. Further studies are needed to determine the leads with the longest QT intervals in manual messuremant.

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