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Related Experiment Video

Updated: Jan 14, 2026

Isolation of Mouse Interstitial Valve Cells to Study the Calcification of the Aortic Valve In Vitro
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In Vitro Calcification of Bioprosthetic Heart Valves: Method Validation by Comparative Heart Valve Calcification

Nicole Kiesendahl1,2, Christoph Schmitz1, Lars Peters3

  • 1Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Medical Faculty RWTH Aachen University, Aachen, Germany.

Artificial Organs
|October 21, 2025
PubMed
Summary

A new in vitro test method effectively assesses bioprosthetic heart valve calcification. This method, validated with porcine valves, offers a cost-effective alternative to animal studies for evaluating anti-calcification treatments.

Keywords:
comparative calcification studycomplexometric Ca quantificationhistomorphologic localization of calcificationshydroxyl apatite (HAP) quantification via μ‐CTstructural identification

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Area of Science:

  • Biomaterials Science
  • Medical Device Engineering
  • Cardiovascular Research

Background:

  • Bioprosthetic heart valve failure is often caused by calcification.
  • Current methods to assess anti-calcification treatments rely on expensive and time-consuming animal studies.
  • A cost-effective, animal-sparing in vitro method is needed.

Purpose of the Study:

  • To develop and validate an accelerated dynamic in vitro calcification test method.
  • To provide a more efficient alternative to large animal studies for evaluating bioprosthetic heart valve treatments.
  • To compare the calcification behavior of differently pretreated porcine heart valve bioprostheses.

Main Methods:

  • Comparative study of two groups of porcine heart valve bioprostheses (N=4 per group).
  • High-speed video (HSV) and microscopy for calcification onset, progression, and extent.
  • X-ray powder diffraction (XRD) for structural identification of deposits.
  • Micro-computed tomography (μ-CT), colorimetry, and complexometry for quantification.
  • Von Kossa staining for histomorphologic localization.

Main Results:

  • Deposits were identified as "biological apatite" in both groups.
  • Calcifications were localized in the spongiosa zone of the valve cusps.
  • Bioprostheses pretreated with an anti-calcifying agent (T6) showed significantly less calcification than untreated (No-T6) bioprostheses.

Conclusions:

  • A novel and validated in vitro test method for calcification assessment was developed.
  • The quantitative results align with in vivo sheep study findings.
  • Structural and histomorphological findings are consistent with existing in vivo observations for porcine prostheses.