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Updated: Jun 20, 2026
Transcatheter Pulmonary Valve Replacement from Autologous Pericardium with a Self-Expandable Nitinol Stent in an Adult Sheep Model
Published on: June 8, 2022
Biointegration and growth of porcine valved pulmonary conduits in a sheep model
Gláucio Furlanetto1, Carlos H Passerino, Rolland Siegel
1Centro de Pesquisas Labcor Laboratórios Belo Horizonte, Minas Gerais, Brazil. gfurlanetto@terra.com.br
Insights
This study shows L-Hydro treated porcine pulmonary conduits can grow with children. These valved conduits demonstrated excellent integration and no calcification in lamb models, offering a promising solution for pediatric heart surgery.
Area of Science:
- Biomaterials Science
- Pediatric Cardiology
- Surgical Innovation
Background:
- Current valved pulmonary conduits are unsuitable for small children, necessitating research into pediatric-specific solutions.
- The L-Hydro process is a novel treatment for porcine conduits, aiming to improve their biocompatibility and growth potential.
- Congenital heart defects often require pulmonary valve replacement, highlighting the need for pediatric-appropriate prosthetics.
Purpose of the Study:
- To evaluate the growth potential and long-term performance of L-Hydro treated porcine pulmonary conduits in a pediatric animal model.
- To assess the hemodynamic function, structural integrity, and biocompatibility of these conduits over a 12-month period.
- To determine if these modified porcine conduits can overcome the limitations of existing options for small children.
Main Methods:
- Implantation of L-Hydro treated porcine conduits into 9 newborn lambs.
- Serial echocardiographic and angiographic assessments of conduit diameter and transvalvular gradients at multiple time points.
- Post-sacrifice histological and radiological analyses to evaluate graft integration, calcification, and leaflet integrity.
Main Results:
- Significant increase in mean valve area from 139.9 mm2 at implantation to 443.5 mm2 at 12 months, indicating substantial growth.
- No significant transvalvular gradient or conduit wall/leaflet calcification observed at 12 months.
- Histological examination revealed complete graft integration with native-like, intact, and endothelialized valve leaflets.
Conclusions:
- L-Hydro treated porcine pulmonary conduits demonstrate significant growth potential and excellent functional performance in a lamb model.
- These conduits exhibit favorable biocompatibility, with no significant calcification and intact, native-like valve leaflets after 12 months.
- This study suggests that L-Hydro treated porcine conduits are a promising, growth-compatible alternative for pediatric pulmonary valve replacement.
Abstract:
As there is currently no suitable valved pulmonary conduit for small children, porcine conduits treated by the L-Hydro process were implanted into 9 newborn lambs to investigate growth potential. Of the 8 survivors, 7 were kept alive for 12 months after implantation. The diameter of the conduit and gradient across the valve were evaluated at surgery and at 3 and 9 months postoperatively using bidirectional echocardiographic and angiographic methods. After sacrifice, histological and radiological analyses were performed. The mean weight of the animals was 4.2 +/- 1.1 kg at implantation and 43.1 +/- 6.2 kg at sacrifice. There was a significant increase in mean valve area from 139.9 +/- 18.0 mm2 at implantation to 443.5 +/- 89.2 mm2 at 12 months. Pre-sacrifice angiography showed no transvalvular gradient, and radiographic analysis did not reveal significant conduit wall or leaflet calcification in any of the animals. Histological examination of the grafts demonstrated total integration, with native-like intact valve leaflets. Thus functional evaluation, echocardiography, and histology demonstrated growth of the grafts with completely endothelialized and apparently normal pulmonary valve leaflets without calcification.
