title: QT dispersion measured by automatic computerized 12-lead electrocardiography contributes significantly to detection of left ventricular hypertrophy in Japanese patients.
abstract: This study assessed the diagnostic value of QT dispersion for left ventricular hypertrophy (LVH) as determined by echocardiography. The QT and QRS interval parameters were determined automatically using computerized 12-lead electrocardiography in 153 Japanese out-patients. Corrected QT dispersion (QTcD) and maximal QRS duration (MaxQRS) were significantly correlated with left ventricular mass index. The sum of QTcD and MaxQRS showed the highest correlation with left ventricular mass index among QT and QRS interval parameters and their combinations. The cut-off points for LVH discrimination in this study were different to those reported in Western, mainly Caucasian, populations, suggesting the need for ethnicity-specific LVH detection criteria. A scoring system derived from multiple logistic regression analysis, employing a combination of QTcD, QRS time-voltage product and ST-T change, showed a specificity of 86.3%. It was concluded that QTcD, in addition to QRS time-voltage product and ST-T change, improved the detection of LVH.
authors.affiliation: Department of Medical Technology, Okayama University Graduate School of Health Sciences, Kita-ku, Okayama, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Izumi
authors.forename: R
authors.initials: R
authors.lastname: Shinohata
authors.forename: N
authors.initials: N
authors.lastname: Ohmaru
authors.forename: T
authors.initials: T
authors.lastname: Kitawaki
authors.forename: S
authors.initials: S
authors.lastname: Usui
authors.forename: S
authors.initials: S
authors.lastname: Ikeda
authors.forename: S
authors.initials: S
authors.lastname: Kusachi
mesh_terms: D000368:Aged; D044466:Asian People / Q000208:ethnology*; D004452:Echocardiography / Q000379:methods*; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D017379:Hypertrophy, Left Ventricular / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000208:ethnology / Q000503:physiopathology; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D010045:Outpatients; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D044465:White People / Q000208:ethnology