Effects of head-up tilt-table test on the QT interval.

Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc
Michael FindlerSami Viskin

Abstract

The QT interval shortens in response to sympathetic stimulation and its response to epinephrine infusion (in healthy individuals and patients with long QT syndrome) has been thoroughly studied. Head-up tilt-table (HUT) testing is an easy way to achieve brisk sympathetic stimulation. Yet, little is known about the response of the QT interval to HUT. We reviewed the electrocardiograms of HUT tests performed at our institution and compare the heart rate, QT, and QTc obtained immediately after HUT with the rest values. The study group consisted of 41 patients (27 females and 14 males) aged 23.9 +/- 8.4 years. Head-up tilting led to a significant shortening of the RR interval (from 825 +/- 128 msec at rest phase to 712 +/- 130 msec in the upward tilt phase, P < 0.001) but only to a moderate shortening of the QT interval (from 363.7 +/- 27.9 msec during rest to 355 +/- 30.3 msec during upward tilt, P = 0.001). Since the RR interval shortened more than the QT interval, the QTc actually increased (from 403 +/- 21.5 msec during rest phase to 423.2 +/- 27.4 msec during upward tilt, P < 0.001). The QTc value measured for the upward tilt position was longer than the resting QTc value in 33 of 41 patients. Of those, 4 male patients and 2 fe...Continue Reading

References

Sep 15, 1992·The American Journal of Cardiology·A SagieD Levy
Nov 1, 1991·The American Journal of Cardiology·R CappatoG E Antonioli
Nov 1, 1982·The American Journal of Cardiology·K F BrowneE N Prystowsky
Nov 24, 1999·Lancet·S Viskin
Jul 18, 2000·Journal of the American College of Cardiology·A P Fitzpatrick, A Zaidi
Feb 25, 2003·Journal of the American College of Cardiology·Wataru ShimizuSilvia G Priori
Jan 15, 2005·Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc·Koichi MizumakiHiroshi Inoue
Apr 27, 2005·Heart Rhythm : the Official Journal of the Heart Rhythm Society·Wataru ShimizuShiro Kamakura
Mar 1, 1950·The Journal of Clinical Investigation·P N YuR Pearson
Oct 14, 2008·American Journal of Physiology. Heart and Circulatory Physiology·Marek MalikGeorg Schmidt
Feb 2, 2010·Journal of the American College of Cardiology·Sami ViskinArthur A M Wilde

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Citations

Aug 31, 2014·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·Christian Torp PedersenIrene Savelieva
Sep 3, 2014·Heart Rhythm : the Official Journal of the Heart Rhythm Society·Christian Torp PedersenUNKNOWN EP-Europace,UK
Jul 28, 2016·Pediatrics International : Official Journal of the Japan Pediatric Society·Yoshiharu OgawaSachiko Kido
Mar 19, 2020·International Journal of Environmental Research and Public Health·Ewelina KolarczykLesław Szydłowski
Jun 29, 2021·Pacing and Clinical Electrophysiology : PACE·Mohammad Reza KhalilianElham Mahmoudi

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