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[Correlation of the vectorcardiographic, echocardiographic parameters and hemodynamics in valvular aortic stenosis]
1Département de Médecine interne, Cliniques Universitaires Saint-Luc, UCL, Bruxelles.
Insights
This study found limited correlation between vectorcardiography (VCG) and echocardiography (ECHO)/hemodynamic (KT) measures in valvular aortic stenosis (VAS). VCG is not a reliable standalone tool for assessing VAS severity.
Area of Science:
- Cardiology
- Medical Imaging
- Biomedical Engineering
Context:
- Valvular aortic stenosis (VAS) requires accurate assessment of severity.
- Echocardiography (ECHO) and hemodynamic (KT) measurements are standard for VAS severity.
- Vectorcardiography (VCG) is a less common method for cardiac assessment.
Purpose:
- To investigate the correlation between VCG parameters and established ECHO/KT parameters in patients with isolated VAS.
- To determine if VCG can reliably assess the severity of valvular aortic stenosis.
Summary:
- This study analyzed 84 correlations between VCG, ECHO, and KT parameters in 54 VAS patients.
- Only a few significant correlations were found, with the best being between VCG's QRS loop azimuthal angle and mean gradient (MG-KT).
- No significant linear correlation existed between VCG indicators of left ventricular hypertrophy (LVH) and ECHO/KT indices of VAS severity.
Impact:
- Findings suggest VCG is not a reliable standalone method for assessing VAS severity.
- ECHO and KT remain primary tools, while VCG may serve as a complementary method.
- Highlights the limitations of each diagnostic modality in VAS assessment.
Abstract:
The objective of this work was to verify the correlation between haemodynamic (KT), echocardiographic (ECHO) and vectorcardiographic (VCG) parameters in valvular aortic stenosis (VAS). The VCG was analyzed by the Louvain programme and compared with reference ECHO and KT parameters--transvalvular peak-gradient (PG), mean gradient (MG) and valvular area (AREA)--in 54 consecutive patients with isolated VAS. Of the 84 correlations studied, only three proved to be significant for linear parameters and six for angular parameters. The best correlation was observed between the azimuthal angle of the spatial area vector of the QRS loop and MG-KT (r2 = 0.36, p less than 0.01). On the other hand, there was no significant correlation between the reference parameters and the amplitude of the QRS spatial maximum vector. The conclusion was drawn that there was no linear correlation between the VCG indicators of LVH and ECHO and KT indices of severity in an unselected VAS population. Each method carries its own limitations and each must be used as a complement to other methods.