Pacing-Induced Increase in QT Dispersion Predicts Sudden Cardiac Death Following Cardiac Resynchronization Therapy
Shajil Chalil, MRCP2,
Zaheer R. Yousef, MD, MRCP,
Sarkaw A. Muyhaldeen, MRCP1,
Russell E. A. Smith, MD, FRCP3,
Paul Jordan, FRCP3,
Christopher R. Gibbs, MD, MRCP and
Francisco Leyva, MD, FRCP3,4,*
Department of Cardiology, Good Hope Hospital, Sutton Coldfield, United Kingdom.
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Figure 1 Box plots of baseline QT interval (QTc) duration and QT dispersion (QTD) and their changes from baseline to 48 days following biventricular pacemaker implantation. The five solid horizontal lines represent the 10th, 25th, 50th, 75th, and 90th percentiles of each variable, from bottom to top. MAE = major arrhythmic events.
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Figure 2 Regression analyses of QRS duration in relation to changes from baseline in QT interval (QTc) and QT dispersion (QTD).
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Figure 3 Kaplan-Meier survival curves according to change in QT dispersion (QTD) from baseline to 48 days following biventricular pacemaker implantation. Dotted line = decrease in QTD; solid line = increase in QTD.
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