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Transthoracic Vector Flow Imaging in Pediatric Patients with Valvular Stenosis - A Proof of Concept Study
Tin-Quoc Nguyen1,2, Thor Bechsgaard3, Michael Rahbek Schmidt4
1Department of Diagnostic Radiology, Rigshospitalet Diagnostisk Center, Copenhagen, Denmark.
Insights
Vector flow imaging (VFI) shows promise in assessing pediatric valvular stenosis. This ultrasound method accurately quantifies flow complexity, correlating well with invasive pressure measurements, unlike traditional Doppler ultrasound.
Area of Science:
- Cardiovascular Imaging
- Pediatric Cardiology
- Ultrasound Technology
Background:
- Continuous wave Doppler ultrasound is standard for detecting cardiac valve stenosis.
- Vector flow imaging (VFI) offers angle-independent, real-time quantification of blood flow complexity.
Purpose of the Study:
- To evaluate the reliability of VFI-derived flow complexity in assessing valvular stenosis severity in pediatric patients.
- To compare VFI with conventional Doppler ultrasound against invasive pressure measurements.
Main Methods:
- Nine pediatric patients with confirmed valvular stenosis were studied.
- VFI and Doppler ultrasound data were compared with invasive catheterization-derived pressure differences.
- Correlation analyses were performed before and after intervention.
Main Results:
- VFI vector concentration showed a strong correlation with invasive pressure measurements (r=-0.83, p=0.01) before intervention.
- Post-intervention changes in VFI vector concentration strongly correlated with changes in pressure difference (r=-0.86, p=0.003).
- Doppler ultrasound showed weaker correlations with invasive measurements.
Conclusions:
- Transthoracic flow complexity quantification using VFI is feasible in pediatric patients.
- VFI may serve as a valuable, non-invasive tool for assessing pediatric valvular stenosis severity.
Abstract:
Purpose Continuous wave Doppler ultrasound is routinely used to detect cardiac valve stenoses. Vector flow imaging (VFI) is an angle-independent real-time ultrasound method that can quantify flow complexity. We aimed to evaluate if quantification of flow complexity could reliably assess valvular stenosis in pediatric patients. Materials and Methods Nine pediatric patients with echocardiographically confirmed valvular stenosis were included in the study. VFI and Doppler measurements were compared with transvalvular peak-to-peak pressure differences derived from invasive endovascular catheterization. Results Vector concentration correlated with the catheter measurements before intervention after exclusion of one outlier (r=-0.83, p=0.01), whereas the Doppler method did not (r=0.49, p=0.22). The change in vector concentration after intervention correlated strongly with the change in the measured catheter pressure difference (r=-0.86, p=0.003), while Doppler showed a tendency for a moderate correlation (r=0.63, p=0.07). Conclusion Transthoracic flow complexity quantification calculated from VFI data is feasible and may be useful for assessing valvular stenosis severity in pediatric patients.
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