Agreement between manual and automated measurements of simple QRS/T angle

• Authors: Andrzej Jaroszyński , Anna Jaroszyńska , Anna Szcześniak , Agnieszka Szymczyk , Tomasz Zaborowski , Tomasz Zapolski , Andrzej Wysokiński , Wojciech Załuska
• Languages of publication: EN

Abstracts

EN

The spatial QRS/T angle (QRS/T) has been identified as a strong and independent predictor of adverse cardiac events. QRS/T can be determined from the electrocardiogram (ECG) by matrix transformation methods or formula which uses a combination of net QRS and T-wave amplitudes (QRS/Tsimple). Amplitudes can be measured automatically by using dedicated software (QRS/Tauto) or can be manually measured on a computer screen (QRS/Tmanual). This latter method allows analysis of QRS/T, when digital ECGs are not available. The aim of the study was to determine the agreement in the measurements between automatically derived QRS and T amplitudes and manually measured on the computer screen amplitudes. The relative error of the QRS/T between the two methods was estimated in 73 patients. In the case of QRS/Tmanual the inter-observer as well as intra-observer variability was estimated. The relative error between QRS/Tauto vs. QRS/Tmanual was 3.51%. Inter-observer and intra-observer variability of the QRS/Tmanual was 1.19% and 1.18% respectively. Manual measurement of the QRS/T is reliable, however, the predictive value of this parameter should be tested in clinical trials, before QRS/Tmanual can be considered a useful tool in clinical practice or retrospective studies.

Keywords

EN

QRS/T angle; Risk prediction; Measurement agreement; Accuracy

• Publisher: De Gruyter Open
• Journal: Open Medicine
• Year: 2014
• Volume: 9
• Issue: 6
• Pages: 737-740

Dates

published

1 - 12 - 2014

online

16 - 8 - 2014

Contributors

author

Andrzej Jaroszyński

• Department of Family Medicine, Medical University of Lublin, 20-090, Lublin, Poland

author

Anna Jaroszyńska

• Department of Cardiology, Medical University of Lublin, 20-090, Lublin, Poland

author

Anna Szcześniak

• Department of Family Medicine, Medical University of Lublin, 20-090, Lublin, Poland

author

Agnieszka Szymczyk

• Department of Family Medicine, Medical University of Lublin, 20-090, Lublin, Poland

author

Tomasz Zaborowski

• Department of Family Medicine, Medical University of Lublin, 20-090, Lublin, Poland

author

Tomasz Zapolski

• Department of Cardiology, Medical University of Lublin, 20-090, Lublin, Poland

author

Andrzej Wysokiński

• Department of Cardiology, Medical University of Lublin, 20-090, Lublin, Poland

author

Wojciech Załuska

• Department of Nephrology, Medical University of Lublin, 20-090, Lublin, Poland

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Identifiers

DOI

10.2478/s11536-013-0342-7