Evolving Bioprosthetic Tissue Calcification Can Be Quantified Using Serial Multislice CT Scanning.

Area of Science:

• Biomaterials Science
• Medical Imaging
• Cardiovascular Surgery

Background:

• Bioprosthetic tissue calcification is a significant factor affecting device longevity and function.
• Accurate in vivo assessment of calcification progression is crucial for understanding bioprosthetic material behavior.
• Current methods for evaluating tissue mineralization in vivo have limitations.

Purpose of the Study:

• To evaluate the utility of serial multislice computed tomography (CT) scanning for in vivo assessment of evolving tissue calcification.
• To investigate the feasibility of quantifying mineralization in different bioprosthetic material configurations.
• To determine the kinetics of tissue mineralization using CT imaging.

Main Methods:

• Implantation of glutaraldehyde-fixed bioprosthetic materials (stentless conduits, stented valves, pericardial patches) in experimental animal models.
• Serial multislice CT scanning performed at various time points post-implantation.
• Quantitative analysis of calcification distribution, volume, and calcium content using CT data.

Main Results:

• CT reliably quantified wall calcification in stentless conduits, showing significant calcium accumulation over 20 weeks.
• Mineralization assessment in stented pericardial valves was hindered by stent material artifacts.
• Pericardial patches demonstrated progressive mineralization, with significant increases in CT-derived calcium volume and content by 8 weeks.

Conclusions:

• Multislice CT scanning is a valuable tool for in vivo visualization and quantification of bioprosthetic tissue mineralization.
• The study demonstrates the ability to determine the kinetics of tissue mineralization through intermediate in vivo evaluations.
• CT imaging offers a non-invasive method to monitor bioprosthetic material changes over time.