Volume 9, Issue 1, Pages (January 2012)

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Volume 9, Issue 1, Pages 66-74 (January 2012) Clinical and electrocardiographic characteristics of patients with short QT interval in a large hospital-based population Akashi Miyamoto, MD, PhD, Hideki Hayashi, MD, PhD, Tomohide Yoshino, MD, Tamiro Kawaguchi, MD, Atsushi Taniguchi, MD, Hideki Itoh, MD, PhD, Yoshihisa Sugimoto, MD, PhD, Makoto Itoh, MD, PhD, Takeru Makiyama, MD, PhD, Joel Q. Xue, PhD, Yoshitaka Murakami, PhD, Minoru Horie, MD, PhD Heart Rhythm Volume 9, Issue 1, Pages 66-74 (January 2012) DOI: 10.1016/j.hrthm.2011.08.016 Copyright © 2012 Heart Rhythm Society Terms and Conditions

Figure 1 Distribution of Bazett QTc interval according to the number of patients (upper row) and the number of ECGs (lower row). Histograms of total, male, and female patients in this study population are displayed in panels A and D, B and E, and C and F, respectively. Heart Rhythm 2012 9, 66-74DOI: (10.1016/j.hrthm.2011.08.016) Copyright © 2012 Heart Rhythm Society Terms and Conditions

Figure 2 Age-specific prevalence of patients with short QT interval in decades according to the number of patients (upper row) and a ratio of patients to the total population of this study (lower row). Histograms of total, male, and female patients are displayed in panels A and D, B and E, and C and F, respectively. Heart Rhythm 2012 9, 66-74DOI: (10.1016/j.hrthm.2011.08.016) Copyright © 2012 Heart Rhythm Society Terms and Conditions

Figure 3 A: Twelve-lead ECG of a 22-year-old male patient who developed ventricular fibrillation. Mean heart rate is 50 beats/min; mean QT interval, 364 ms; and mean QTc interval, 332 ms. Early repolarization is present in leads I, II, aVF, and V3-6. *Nonconducting P wave due to Wenckebach atrioventricular block. B: Monitored ECG showing occurrence of ventricular fibrillation. *A short-coupled ventricular premature contraction initiated ventricular fibrillation that lasted for >1 minute and then self-terminated. Heart Rhythm 2012 9, 66-74DOI: (10.1016/j.hrthm.2011.08.016) Copyright © 2012 Heart Rhythm Society Terms and Conditions

Figure 4 A: Twelve-lead ECG of a 54-year-old male patient who developed syncope repeatedly. Mean heart rate is 51 beats/min; mean QT interval, 386 ms; and mean QTc interval, 355 ms. Early repolarization is absent. B: ST-segment elevation in right precordial leads by intravenous administration of pilsicainide. Heart Rhythm 2012 9, 66-74DOI: (10.1016/j.hrthm.2011.08.016) Copyright © 2012 Heart Rhythm Society Terms and Conditions