Abstract：
BACKGROUND:QT interval measured in the electrocardiogram (ECG) varies with RR interval challenging the calculation of corrected QT (QTc) in Atrial fibrillation (AF). OBJECTIVES:To identify the ideal Lead, number of complexes and the formula to measure QTc that correlates best between AF and sinus rhythm (SR). PROCEDURE:We identified ECGs from patients with AF before and after conversion to SR. After excluding patients on drugs and clinical conditions that prolong QT interval, QTc was calculated from all the leads using the formulae: Bazett (BF), Fridericia (FF), Framingham(FrF), Hodges (HF), Saige (SF) and Rautaharju (RF) during AF and SR. After identifying the lead with best linear correlation, we calculated QTc following the longest RR, multiple QRS complexes and average automated RR interval during AF and compared to SR. FINDINGS:In 52 patients (male 69%, age 63 ± 9 yrs), QTc measured from Lead II correlated best with SR in majority of the formulae. QTc was consistently shorter with linear formulae. While BF overestimated QTc, FF was optimal comparing AF vs SR (416 ± 33 vs 411 ± 38 ms, ns) calculated from single, multiple or average automated RR interval. Bland Altman analysis of the average automated QTc versus the delta of individual automated QTcs shows the least variation in the QTc calculated by FF. CONCLUSIONS:BF in commercial software is not ideal for measurement of QTc in AF, Fridericia Formula in lead II from the average RR from automated ECG measurement maybe utilized for the calculation of QTc.
journal_name
J Electrocardioljournal_title
Journal of electrocardiologyauthors
Dash A,Torado C,Paw N,Fan D,Pezeshkian N,Srivatsa Udoi
10.1016/j.jelectrocard.2019.06.009subject
Has Abstractpub_date
2019-01-01 00:00:00pages
70-76eissn
0022-0736issn
1532-8430pii
S0022-0736(19)30223-7journal_volume
56pub_type
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journal_title：Journal of electrocardiology
pub_type： 杂志文章
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journal_title：Journal of electrocardiology
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journal_title：Journal of electrocardiology
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journal_title：Journal of electrocardiology
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doi：
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journal_title：Journal of electrocardiology
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doi：10.1016/s0022-0736(97)80046-5
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journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/0022-0736(91)90010-j
更新日期：1991-04-01 00:00:00
abstract：:Sinus rhythm tracings, including sinus tachycardia and bradycardia, are characterized quantitatively by means of an ECG measurement program which has been subjected to rigorous evaluation. The analysis is performed on tracings of short duration (10 sec). The features of regularity and stability are considered for the ...
journal_title：Journal of electrocardiology
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doi：10.1016/s0022-0736(76)80063-5
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journal_title：Journal of electrocardiology
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doi：10.1016/s0022-0736(81)81007-2
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doi：10.1016/s0022-0736(00)80096-5
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journal_title：Journal of electrocardiology
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doi：10.1054/jelc.2001.28810
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abstract：:The authors present an original method for the discrimination of patients prone to ventricular tachycardia. The wavelet transform, which is a new time-scale technique suitable for transient signal detection, was applied to bipolar unfiltered X, Y, Z signal-averaged electrocardiograms in 20 postinfarction patients with...
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journal_title：Journal of electrocardiology
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doi：10.1016/j.jelectrocard.2013.04.003
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journal_title：Journal of electrocardiology
pub_type： 杂志文章
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journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/j.jelectrocard.2011.02.003
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pub_type： 杂志文章
doi：10.1016/j.jelectrocard.2020.02.016
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journal_title：Journal of electrocardiology
pub_type： 杂志文章,评审
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更新日期：2000-01-01 00:00:00
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journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/j.jelectrocard.2012.02.004
更新日期：2012-05-01 00:00:00
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journal_title：Journal of electrocardiology
pub_type： 杂志文章
doi：10.1016/s0022-0736(98)90009-7
更新日期：1998-01-01 00:00:00
