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Methods of Assessment and Clinical Relevance of QT Dynamics [PDF]

Indian Pacing and Electrophysiology Journal, 2005
The dependence on heart rate of the QT interval has been investigated for many years and several mathematical formulae have been proposed to describe the QT interval/heart rate (or QT interval/RR interval) relationship. While the most popular is Bazett’s
Beata Sredniawa, Agata Musialik-Lydka, Piotr Jarski, Anna Sliwinska, Zbigniew Kalarus   +4 more
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Thoracic epidural analgesia prolongs postoperative QT interval on electrocardiogram in major non-cardiac surgery: a randomized comparison and a prospective cohort analysis

Frontiers in Pharmacology, 2023
Introduction: Prolongation of QT interval on electrocardiogram can be associated with perioperative lethal arrhythmia. Epidural analgesia is a commonly used modality to relieve surgical pain by blocking sensory nerves, which also blocks the autonomic ...
Kotaro Hori, Shogo Tsujikawa, Mika Egami, Sayaka Waki, Ryota Watanabe, Hideki Hino, Tadashi Matsuura, Takashi Mori   +7 more
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Haloperidol affects coupling between QT and RR intervals in guinea pig isolated heart

Journal of Pharmacological Sciences, 2019
Prolonged QT interval is an independent risk factor for development of ventricular arrhythmias. Haloperidol is one of the drugs inducing QT prolongation.
Petr Vesely, Tibor Stracina, Miroslava Hlavacova, Josef Halamek, Jana Kolarova, Veronika Olejnickova, Veronika Mrkvicova, Hana Paulova, Marie Novakova   +8 more
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Transient Long QT Development in a Patient with Takotsubo Cardiomyopathy

Journal of Cardiovascular Emergencies, 2016
QT interval prolongation on the electrocardiogram is considered a precursory sign for imminent, potentially lethal ventricular arrhythmias. Beside the inherited condition of long QT syndrome, numerous drugs, certain electrolyte disturbances and early ...
Czuriga Dániel, Szegedi Andrea, Győry Ferenc, Szilágyi Attila, Sipka Sándor, Kertész Attila, Fülöp László, Czuriga István, Péter Andrea, Édes István, Bódi Annamária   +10 more
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Evaluation of Tp-e interval, Tp-e/QT ratio and Tp-e/QTc ratio in patients with acute pancreatitis

Acta Medica Alanya, 2020
Aim: Acute pancreatitis may affect cardiovascular system regardless of etiology. Electrocardiographic parameters such as QT interval, corrected QT interval (QTc), Tp-e interval and Tp-e/QT, Tp-e/QTc ratio can be used to evaluate myocardial repolarization.
Yilmaz Güler, Can Ramazan Öncel
doaj   +1 more source

Estimation of cardiac QTc intervals in people prescribed antipsychotics: a comparison of correction factors

Therapeutic Advances in Psychopharmacology, 2022
Background: A prolonged electrocardiogram (ECG) QT interval is associated with cardiac events and increased mortality. Antipsychotics can prolong the QT interval.
Teodora Andric, Karl Winckel, Timothy David Tanzer, Samantha Hollingworth, Lesley Smith, Katherine Isoardi, Olivier Tan, Dan Siskind   +7 more
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Automated versus Manual Measurement of the QT Interval and Corrected QT Interval [PDF]

Annals of Noninvasive Electrocardiology, 2011
Background: The International Conference on Harmonization E14 Guideline specifies detailed assessment of QT interval or corrected QT interval prolongation when developing new drugs. We recently devised new software to precisely measure the QT interval.
Yuji, Kasamaki, Yukio, Ozawa, Masakatsu, Ohta, Akira, Sezai, Takashi, Yamaki, Mutsuo, Kaneko, Ichiro, Watanabe, Atsushi, Hirayama, Tomohiro, Nakayama   +8 more
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QTc interval measurement in patients with right bundle branch block: A practical method

Annals of Noninvasive Electrocardiology, 2023
Background and Aim Prolonging the QT interval in the right bundle branch block (RBBB) can create challenges for electrophysiologists in estimating repolarization time and eliminating the effect of depolarization changes on QT interval.
Abolfath Alizadeh, Mohammad Amin Shahrbaf, Mohammadrafie Khorgami, Mahboubeh Zeighami, Ala Keikhavani, Hamid Mokhtari Torshizi, Zahra Teimouri‐jervekani   +6 more
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The QT interval in clinical hypercalcemia [PDF]

Clinical Cardiology, 1981
AbstractCorrected QT intervals were determined in 13 patients with severe, chronic hypercalcemia. The QOTC interval was short in only 2 of 14 instances; QATC in 5 of 15 instances, and QETC in 5 of 16 instances. The correlations between serum calcium and the QTC measurement were not significant when evaluating either linear or curvilinear (quadratic ...
J, Wortsman, S, Frank
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The effect of esmolol on corrected-QT interval, corrected-QT interval dispersion changes seen during anesthesia induction in hypertensive patients taking an angiotensin-converting enzyme inhibitor

Revista Brasileira de Anestesiologia, 2015
BACKGROUND AND OBJECTIVES: The importance of minimizing the exaggerated sympatho-adrenergic responses and QT interval and QT interval dispersion changes that may develop due to laryngoscopy and tracheal
Zahit Çeker, Suna Akin Takmaz, Bülent Baltaci, Hülya Basar   +3 more
doaj   +1 more source