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ST-deviation reconstruction in missing leads on the 12-lead ECG: applicability in studies on ST-segment resolution
Jozef Kaluzay1, Katleen Vandenberghe, Damien Fontaine
1Department of Cardiology, University Hospital Gasthuisberg, University of Leuven, Leuven, Belgium.
Insights
Mathematical formulas can reconstruct missing ST-segment deviation (STdev) data in electrocardiograms (ECG) for myocardial infarction (MI) trials. This improves statistical power by including more patients in reperfusion therapy (STR) analysis.
Area of Science:
- Cardiology
- Medical Imaging
- Biostatistics
Background:
- Quantitative analysis of ST-segment deviations (STdev) and their resolution (STR) is crucial in myocardial infarction (MI) reperfusion trials.
- Exclusion of patients due to unreadable or unavailable electrocardiogram (ECG) leads reduces trial statistical power.
Purpose of the Study:
- To develop and validate mathematical formulas for reconstructing immeasurable STdev from available ECG leads.
- To assess the reliability of reconstructed STdev for evaluating reperfusion therapy (STR) in MI trials.
Main Methods:
- Formulas were derived from computer-assisted STdev measurements in 1121 patients' ECGs (baseline and 180 min post-thrombolysis).
- Accuracy was validated on a separate dataset of 377 patients.
- Intraclass correlation coefficients (ICC) were used to compare real and calculated STdev, and STR.
Main Results:
- Accurate STdev reconstruction was achieved for single missing leads or limb lead groups (ICC >= 0.80).
- Reconstructed STdev showed very strong correlation with original data for STR calculation (ICC >= 0.97).
- Reconstruction is not reliable for multiple missing precordial leads or specific baseline lead analysis.
Conclusions:
- STdev reconstruction formulas offer a reliable method for trials analyzing aggregate STR.
- This approach can significantly increase patient eligibility, enhancing the statistical power of MI reperfusion trials.
Abstract:
Quantitative analysis of ST-segment deviations (STdev) and their resolution by treatment (STR; calculated from a combined sum of STdev in multiple leads) are used in trials on reperfusion for myocardial infarction (MI). Unreadable or unavailable electrocardiogram (ECG) leads are a common reason for exclusion, decreasing the statistical power of the trials. We developed mathematical formulas for reconstruction of immeasurable STdev based on STdev from other available leads on the 12-lead ECG. Formulas were deducted from a database of computer-assisted STdev measurements in 2 ECGs (baseline and 180 min after thrombolysis) of 1121 pts. Their accuracy was later evaluated on a second dataset of 377 pts. Acceptable fits could be derived for absent single leads, or for groups of absent limb leads (I-II-III or aVL-aVF). The intraclass correlation coefficient between real and calculated STdev was >or= 0.80 for each (0.77 for V1 in inferior MI). The correlations between STR calculated from original data and from reconstructed STdev were very strong (all intraclass correlation >or=0.97), and discordance in STR subgroup categorization occurred in