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Rate-dependence of QT dispersion and the QT interval: comparison of atrial pacing and exercise testing

Markus Zabel, MD^*, Michael R. Franz, MD, PhD, FACC, Thomas Klingenheben, MD, Boris Mansion, MD, Heinz-Peter Schultheiss, MD^* and Stefan H. Hohnloser, MD, FACC

^* Division of Cardiology, Department of Medicine, Klinikum Benjamin Franklin, Free University of Berlin, Berlin, Germany
Division of Cardiology, Department of Medicine, J.W. Goethe University, Frankfurt, Germany
Division of Cardiology and Clinical Pharmacology, Georgetown University and Veterans Affairs Medical Center, Washington, DC, USA

View larger version (26K): [in a new window]   Figure 1 Rate-dependence of the Q-Tpeak interval (panel A) and the QT interval (panel B). Triangles denote data points derived from exercise testing, and open circles those from atrial pacing, respectively. For each set of data, the regression lines are shown in the figure, including the equation of the regression line with slope, intercept, and p value.

View larger version (54K): [in a new window]   Figure 2 Rate-dependence of QT dispersion (panel A), precordial QT dispersion (panel B), the Tpeak-to-Tend (TPE) interval (panel C), and the T area (panel D). For each set of data, the regression lines are shown in the figure, including the equation of the regression line with slope, intercept, and p value.