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

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Jaroszyński A., Jaroszyńska A., Szcześniak A., Szymczyk A., Zaborowski T., Zapolski T., Wysokiński A., Załuska W.

Open Medicine

2014

vol. 9

issue 6

737-740

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.

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1 Open Medicine

1 2014

1 Jaroszyńska A.

1 Jaroszyński A.

1 Szcześniak A.

1 Szymczyk A.

1 Wysokiński A.

1 Zaborowski T.

1 Zapolski T.

1 Załuska W.

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