Related Experiment Videos
Comparative study of the L-hydro process and glutaraldehyde preservation
Vinicius J S Nina1, Pablo M A Pomerantzeff, Ivan S J Casagrande
1The Heart Institute (HC-InCor), University of São Paulo Medical School, São Paulo, Brazil. rvnina@aol.com
Asian Cardiovascular & Thoracic Annals
|August 23, 2005
Summary
The L-Hydro process enables bioprosthetic heart valves to be naturally covered by endothelial cells, unlike traditional glutaraldehyde treatments. This promotes better integration and healing of the implanted valves.
Area of Science:
- Biomaterials Science
- Cardiovascular Research
- Tissue Engineering
Background:
- Commercial bioprosthetic heart valves are preserved in glutaraldehyde, a cytotoxic agent that inhibits natural endothelial cell coverage.
- This lack of endothelialization can lead to adverse host responses and limit valve longevity.
Purpose of the Study:
- To evaluate the in vivo endothelialization potential of bioprosthetic heart valves treated with the L-Hydro process.
- To compare the cellular response of L-Hydro-treated valves with traditional glutaraldehyde-fixed valves.
Main Methods:
- Porcine heart valves underwent either L-Hydro treatment or glutaraldehyde fixation.
- Valves were implanted in the mitral position of juvenile sheep.
- Post-implantation evaluation included echocardiography, angiography, histology, and electron microscopy.
Main Results:
- L-Hydro-treated valves demonstrated nearly complete endothelial cell coverage on all leaflets after 5 months.
- Endothelial cells on L-Hydro valves were in direct contact with the underlying collagen and expressed relevant antigens.
- Glutaraldehyde-treated valves showed limited endothelialization, with surfaces covered by fibrin, macrophages, and thrombotic material.
Conclusions:
- The L-Hydro process facilitates spontaneous in vivo endothelialization of bioprosthetic heart valves.
- This improved cellular integration suggests enhanced biocompatibility compared to glutaraldehyde fixation.