Similarities and discrepances between derived vector electrocardiogram parameters in McFee—Parungao vs Frank lead systems

Drozdov DV, Kozlovskaya IL, Aidu EA-I, Sakhnova TA, Blinova EV, Trunov VG, Sobolev AV. Similarities and discrepances between derived vector electrocardiogram parameters in McFee—Parungao vs Frank lead systems. Russian Cardiology Bulletin. 2025;20(4):26‑37. (In Russ.)
https://doi.org/10.17116/Cardiobulletin20252004126

Подписка 2026 Кардиологический вестник (Russian Cardiology Bulletin)

Использование инфографики авторами научных работ

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OBJECTIVE

To determine vECG and orthogonal ECG3 parameters and ranges of their changes for which diagnostic significance of estimates will be the same between MacPhee-Parungao leads calculated using Trunov-Aidu transformation and most common Frank leads calculated using Kors matrix and inverse Dauer matrix.

MATERIAL AND METHODS

An observational single-center non-controlled study included 1250 digital 12-lead ECGs recorded from 1250 adults with common cardiovascular diseases: hypertension, coronary artery disease, previous myocardial infarction, aortic stenosis, etc. We calculated orthogonal ECG3 in McFee-Parungao (Trunov-Aidu matrix) and Frank (Kors matrix and Dawer inverse matrix) leads. Statistical processing included correlation analysis and Bland-Altman plots to assess measurement agreement.

RESULTS

The study found significant diversity in ECG patterns among all ECGs. Amplitudes of ECG3 waves showed good agreement across all transformations. Integral vectors, fractional integrals, and ventricular gradient demonstrated high correlation. While spatial area of QRS loop showed consistency, its projections on orthogonal planes were less aligned. Spatial angle QRS-T exhibited high degree of linear correlation. Planar indexes of QRS loop and length parameters showed close results between McFee-Parungao and Frank systems.

CONCLUSION

Measurements of integral vECG characteristics in computational orthogonal lead systems McFee-Parungao and Frank yield comparable results. Extreme values of spatial angle QRS-T (>130°) associated with high cardiovascular risk show high agreement. However, intermediate and borderline values should be interpreted considering calculation method. Planar indexes>0.91 may also be interpreted with high consistency.

Keywords:

Electrocardiography

Vectorcardiography

Signal Processing

Computer-Assisted

Authors:

Drozdov D.V.

Chazov National Medical Research Center of Cardiology

ORCID: 0000-0001-7374-3604

Kozlovskaya I.L.

Chazov National Medical Research Center of Cardiology

ORCID: 0000-0002-7458-4315

Aidu E.A.-I.

Kharkevich Institute for Information Transmission Problems

ORCID: 0000-0001-9505-4404

Sakhnova T.A.

Chazov National Medical Research Center of Cardiology

ORCID: 0000-0002-5543-7184

Blinova E.V.

Chazov National Medical Research Center of Cardiology

ORCID: 0000-0001-8725-7084

Trunov V.G.

Kharkevich Institute for Information Transmission Problems

ORCID: 0000-0002-6084-1608

Sobolev A.V.

Chazov National Medical Research Center of Cardiology

ORCID: 0000-0002-8040-0770

Received:

13.10.2025

Accepted:

18.10.2025

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