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Nikoo MH, Estedal A, Pakfetrat M, Abtahi F, Heydari ST. Mortality-related electrocardiogram indices in methanol toxicity. World J Emerg Med 2022; 13:226-228. [PMID: 35646209 PMCID: PMC9108912 DOI: 10.5847/wjem.j.1920-8642.2022.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Accepted: 10/26/2021] [Indexed: 09/17/2023] Open
Affiliation(s)
- Mohammad Hossein Nikoo
- Non-communicable Diseases Research Center, Shiraz University of Medical Sciences, Shiraz 71345-1877, Iran
| | - Alireza Estedal
- Health Policy Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz 71345-1877, Iran
| | - Maryam Pakfetrat
- Department of Internal Medicine, Shiraz Nephro-Urology Research Center, Shiraz University of Medical Sciences, Shiraz 71345-1877, Iran
| | - Firoozeh Abtahi
- Departement of Cardiology, Cardiovascular Research Center, Shiraz University of Medical Sciences, Shiraz 71345-1877, Iran
| | - Seyed Taghi Heydari
- Health Policy Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz 71345-1877, Iran
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Bogossian H, Linz D, Heijman J, Bimpong-Buta NY, Bandorski D, Frommeyer G, Erkapic D, Seyfarth M, Zarse M, Crijns HJ. QTc evaluation in patients with bundle branch block. IJC HEART & VASCULATURE 2020; 30:100636. [PMID: 32995475 PMCID: PMC7509006 DOI: 10.1016/j.ijcha.2020.100636] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 09/07/2020] [Indexed: 02/06/2023]
Abstract
Proper measurement of the QT interval on the 12-lead body-surface ECG is challenging in daily practice. Even more difficult is its correct estimation in the presence of repolarization abnormalities, arrhythmias or bundle-branch blocks (BBB). The QT interval results from two parts of the ECG: (1) the QRS complex, describing the excitation of the ventricles and (2) the JT interval, describing the repolarisation of the ventricles. Prolongation of the QRS width – like in the presence of BBB – entails prolongation of the QT interval, making the estimation of the true repolarisation time challenging. The US recommendations for the standardization and interpretation of the ECG suggest focusing on the JT interval in presence of BBB. However, in clinical practice physicians have become more familiar with the interpretation of QT-interval measurements than with the interpretation of the JT Interval. In the last decade, a simple formula for the estimation of the “modified QT interval” in the presence of left or right BBB has been developed and evaluated. In this formula, the modified QT interval is calculated by subtracting 50% of the length of the BBB-QRS from the measured QT interval (QTm = QTBBB − 50% QRSBBB). Subsequently, rate-correction formula should be applied as usual. In this review, we discuss the determination of the QT-interval in the presence of BBB and summarize the origin and application of the modified QT-interval formula.
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Affiliation(s)
- Harilaos Bogossian
- Department of Cardiology and Rhythmology, Ev. Krankenhaus Hagen, Hagen, Germany.,Department of Cardiology, University Witten/Herdecke, Witten, Germany.,Department of Cardiology, Maastricht University Medical Center (MUMC+) and Cardiovascular Research Institute Maastricht (CARIM), Maastricht, the Netherlands
| | - Dominik Linz
- Department of Cardiology, Maastricht University Medical Center (MUMC+) and Cardiovascular Research Institute Maastricht (CARIM), Maastricht, the Netherlands
| | - Jordi Heijman
- Department of Cardiology, Maastricht University Medical Center (MUMC+) and Cardiovascular Research Institute Maastricht (CARIM), Maastricht, the Netherlands
| | | | - Dirk Bandorski
- Faculty of Medicine, Semmelweis University Campus Hamburg, Hamburg, Germany
| | - Gerrit Frommeyer
- Division of Electrophysiology, Department of Cardiovascular Medicine, University of Münster, Münster, Germany
| | - Damir Erkapic
- Diakonie Klinikum Siegen, Department of Cardiology and Electrophysiology, Siegen, Germany
| | - Melchior Seyfarth
- Department of Cardiology, University Witten/Herdecke, Witten, Germany.,Department of Cardiology, Helios Klinikum Wuppertal, Germany
| | - Markus Zarse
- Department of Cardiology, University Witten/Herdecke, Witten, Germany
| | - Harry J Crijns
- Department of Cardiology, Maastricht University Medical Center (MUMC+) and Cardiovascular Research Institute Maastricht (CARIM), Maastricht, the Netherlands
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