Abstract
This study aimed to test how different QT interval variability (QTV) indices change in patients with coronary artery disease (CAD) and congestive heart failure (CHF). Twenty-nine healthy volunteers, 29 age-matched CAD patients, and 20 age-matched CHF patients were studied. QT time series were derived from 5-min resting lead-II electrocardiogram (ECG). Time domain indices [mean, SD, and QT variability index (QTVI)], frequency-domain indices (LF and HF), and nonlinear indices [sample entropy (SampEn), permutation entropy (PE), and dynamical patterns] were calculated. In order to account for possible influence of heart rate (HR) on QTV, all the calculations except QTVI were repeated on HR-corrected QT time series (QTc) using three correction methods (i.e., Bazett, Fridericia, and Framingham method). Results showed that CHF patients exhibited increased mean, increased SD, increased LF and HF, decreased T-wave amplitude, increased QTVI, and decreased PE, while showed no significant changes in SampEn. Interestingly, CHF patients also showed significantly changed distribution of the dynamical patterns with less monotonously changing patterns while more fluctuated patterns. In CAD group, only QTVI was found significantly increased as c...Continue Reading
References
Oct 1, 1991·Circulation·E G SchoutenJ Pool
Oct 7, 1997·Circulation·R D BergerG F Tomaselli
Aug 14, 1999·Journal of Internal Medicine·P P Davey
Aug 27, 1999·European Heart Journal·P BrooksbyK A Fox
Apr 18, 2000·Progress in Cardiovascular Diseases·P Davey
May 10, 2000·The American Journal of Cardiology·M I Anastasiou-NanaS D Moulopoulos
May 20, 2000·Journal of Electrocardiology·B VrtovecR Starc
Nov 1, 2001·IEEE Transactions on Bio-medical Engineering·A PortaS Cerutti
May 15, 2002·Physical Review Letters·Christoph Bandt, Bernd Pompe
Mar 26, 2003·Psychosomatic Medicine·Robert M CarneyVikram K Yeragani
Apr 1, 2003·Circulation·Bojan VrtovecBranislav Radovancevic
Oct 7, 2004·Journal of the American College of Cardiology·Mark C HaigneyUNKNOWN Multicenter Automatic Defibrillator Implantation Trial II investigators
Nov 10, 2004·Journal of Electrocardiology·Shen LuoPeter W Macfarlane
Aug 8, 2006·Translational Research : the Journal of Laboratory and Clinical Medicine·Gianfranco PiccirilloDamiano Magrí
Jul 17, 2007·Schizophrenia Research·Karl-Jürgen BärVikram K Yeragani
Aug 1, 2007·Physiological Measurement·M J Lewis, A L Short
Aug 22, 2009·Journal of the American College of Cardiology·Gianfranco PiccirilloPeng-Sheng Chen
Aug 22, 2009·Journal of the American College of Cardiology·Ronald D Berger
Apr 5, 2011·Heart Rhythm : the Official Journal of the Heart Rhythm Society·Craig P DobsonUNKNOWN GISSI-HF Investigators
May 3, 2011·Computers in Biology and Medicine·Mathias BaumertAndreas Voss
Jul 24, 2012·Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc·Muhammad A HasanMathias Baumert
Oct 16, 2012·Annals of Biomedical Engineering·Jennifer M YentesNicholas Stergiou
Aug 14, 2013·Journal of Electrocardiology·Katerina HnatkovaMarek Malik
Sep 3, 2013·Journal of Graduate Medical Education·Gail M Sullivan, Richard Feinn
Oct 10, 2013·Physiological Measurement·Mathias BaumertMichal Javorka
Aug 1, 2014·BMC Bioinformatics·Christopher C MayerSiegfried Wassertheurer
Aug 6, 2014·Heart·Maartje N NiemeijerPeter R Rijnbeek
Oct 30, 2014·Medical & Biological Engineering & Computing·Peng LiYinglong Hou
Jan 30, 2016·Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology·Mathias BaumertPaul G A Volders
Jul 5, 2016·Frontiers in Physiology·Martin SchmidtSebastian Zaunseder
Mar 7, 2017·Physiological Measurement·Dorota WejerZbigniew R Struzik
Jul 1, 2017·Frontiers in Endocrinology·Andrea OroszCsaba Lengyel