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Related Concept Videos

Heart Valves01:16

Heart Valves

4.3K
The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
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Related Experiment Video

Updated: Jun 1, 2025

Four-Dimensional Computed Tomography-Guided Valve Sizing for Transcatheter Pulmonary Valve Replacement
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Valve Frame Geometry and Arrhythmia Risk Following Self-Expanding Transcatheter Pulmonary Valve Replacement.

Natalie Soszyn1, Gabriel Yuen2, Salvador R Franco2

  • 1School of Medicine, Children's Hospital Colorado, The Heart Institute, University of Colorado Denver|Anschutz Medical Campus, 13123 E 16Th Ave, Box 100, Aurora, CO, 80045-2560, USA.

Pediatric Cardiology
|January 19, 2025
PubMed
Summary
This summary is machine-generated.

Clinically-significant ventricular arrhythmia (CSVA) after transcutaneous pulmonary valve replacement (TPVR) is linked to larger valve frame dimensions near the right ventricle. Further research is needed to understand this association in self-expanding valve patients.

Keywords:
AlterraArrythmiaHarmonySelf-expandingTranscatheter pulmonary valve replacementValve geometry

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Area of Science:

  • Cardiology
  • Interventional Cardiology
  • Biomedical Engineering

Background:

  • Transcutaneous pulmonary valve replacement (TPVR) is a minimally invasive procedure.
  • Clinically-significant ventricular arrhythmia (CSVA) is a rare but reported complication after TPVR with self-expanding valves.
  • The relationship between valve frame dimensions and CSVA risk requires further investigation.

Purpose of the Study:

  • To evaluate if alterations in valve frame dimensions and geometry within the right ventricular outflow tract (RVOT) after TPVR correlate with CSVA risk.
  • To compare CSVA incidence in patients receiving Harmony TPV25 versus Alterra pre-stent valves.

Main Methods:

  • A retrospective review of 28 patients who underwent TPVR with Harmony TPV25 or Alterra pre-stent valves.
  • Post-procedural 3D rotational imaging was used to measure valve frame dimensions (minimum/maximum diameters, perimeter, cross-sectional area).
  • Calculated RVOT-to-valve frame ratio, percentage expansion, circularity, and eccentricity indices to assess RVOT-valve frame interaction.

Main Results:

  • CSVA occurred more frequently in patients with congenital pulmonary stenosis (p=0.02).
  • A larger mean valve frame perimeter (118.3 vs 108.6 mm, p=0.03) and cross-sectional area (1124.5 vs 926.2 mm², p=0.03) near the right ventricular cavity were associated with CSVA.
  • No significant associations were found between RVOT-to-valve frame ratio, valve geometry parameters, or implant level and CSVA.

Conclusions:

  • Larger valve frame dimensions, specifically perimeter and cross-sectional area near the RV cavity, may be associated with an increased risk of CSVA after TPVR.
  • No single mechanism definitively explains CSVA in self-expanding valve implantation.
  • Larger cohort studies are recommended to further elucidate the relationship between valve characteristics and CSVA in TPVR.