Dispersions of the QT interval in postmyocardial infarction patients presenting with ventricular tachycardia or with ventricular fibrillation

The American Journal of Cardiology
L OikarinenL Toivonen

Abstract

Increased QT interval dispersion is associated with ventricular arrhythmias. The aim of this study was to examine if in postmyocardial infarction patients with impaired left ventricular function, increased QT dispersion is associated with ventricular tachycardia (VT) and ventricular fibrillation (VF). Measures of QT dispersion, calculated as maximum-minimum (D) and standard deviation (SD) of QTend, QTapex, JTend, JTapex, and Tend intervals in the 12-lead electrocardiogram, were compared in patients who late after myocardial infarction experienced sustained VT (VT group) only, VF (VF group) only, or had no ventricular arrhythmias (controls). The 25 patients in each group were individually matched for age, gender, number of diseased coronary vessels, location of the previous myocardial infarction, and left ventricular ejection fraction. Dispersion measures of QTend, QTapex, and JTapex intervals separated VT group from controls, but none of the measures separated the VF group from controls. QTendD was 49+/-18 ms in controls, 57+/-18 ms in the VF group (controls vs VF group, p = NS), and 65+/-29 ms in the VT group (controls vs VT group, p <0.05). VT group had increased QTapexSD, JTapexSD, and JTapexD compared with the VF group. The...Continue Reading

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Citations

Mar 6, 2007·Archives of Disease in Childhood·Irene M Onvlee-DekkerA Derk Jan Ten Harkel
Mar 8, 2005·International Archives of Occupational and Environmental Health·L SantangeloN Sannolo
May 19, 2005·Computers in Biology and Medicine·Carlos Alvarado-SerranoRamon Pallàs-Areny

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