PMID: 8539160Oct 1, 1995Paper

Dynamic relationship between the Q-aT interval and heart rate in patients with long QT syndrome during 24-hour Holter ECG monitoring

Pacing and Clinical Electrophysiology : PACE
T EmoriK Shimomura

Abstract

The purpose of this study was to investigate the dynamic relationship between heart rate and the Q-aT interval (the interval from the Q wave to the T wave apex) in patients with long QT syndrome. The QT to heart rate relation is useful for evaluating abnormalities of the ventricular repolarization, but its clinical application to the long QT syndrome requires accurate computer aided measurement of the QT interval and the sampling of a large number of beats. Therefore, the Q-aT interval was used on the basis of some reports that the heart rate dependency of the QT interval was concentrated in the Q-aT interval. Recent advances in the computer technology have allowed analysis of the relationship between the Q-aT and RR intervals on Holter ECG recordings. However, in addition to a prolonged QT interval, most patients with long QT syndrome have bizarre and variable T waves and the influence of this T wave morphology on the Q-aT to heart rate relation has not been clarified. We investigated the dynamic relationship between the Q-aT interval and heart rate in 10 patients with long QT syndrome and 11 control subjects using our original computer algorithm for the analysis of 24-hour Holter ECG recordings. The patients showed morphologi...Continue Reading

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Citations

Jul 18, 2000·Journal of the American College of Cardiology·F E Cruz FilhoJ C Ribeiro
Aug 14, 1999·Journal of Internal Medicine·P P Davey
Dec 24, 2010·Circulation Journal : Official Journal of the Japanese Circulation Society·Akira Fujiki, Masao Sakabe
May 20, 2004·Journal of Cardiovascular Electrophysiology·Jan NemecMichael J Ackerman
Jan 30, 2009·Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc·Fabrice ExtramianaPierre Maison-Blanche
Mar 18, 1999·The American Journal of Cardiology·L FauchierJ P Fauchier
Apr 6, 2000·Pacing and Clinical Electrophysiology : PACE·G LandeD Escande
Jul 7, 1999·Pacing and Clinical Electrophysiology : PACE·T Emori, T Ohe
Jul 25, 2007·Anesthesia and Analgesia·Dominic Hegarty
Aug 23, 2020·Sensors·Takao OhmutaNitaro Shibata

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