AI Article Synopsis
- The study focused on evaluating bacterial nanocellulose (BNC) patches for closing ventricular septal defects (VSDs) in pigs, highlighting their improved mechanical properties and low inflammatory response compared to traditional materials.
- BNC patches showed a decrease in Young's modulus and tensile strength after blood exposure, indicating increased elasticity, and successfully closed VSDs without complications or residual shunting after 90 days.
- Overall, the findings suggest that BNC patches offer good mid-term results and satisfactory biocompatibility, making them a promising alternative for congenital heart defect repairs.
Article Abstract
Objectives: Current materials for closure of cardiac defects such as ventricular septal defects (VSDs) are associated with compliance mismatch and a chronic inflammatory response. Bacterial nanocellulose (BNC) is a non-degradable biomaterial with promising properties such as high mechanical strength, favourable elasticity and a negligible inflammatory reaction. The aim of this study was the evaluation of a BNC patch for VSD closure and the investigation of its in vivo biocompatibility in a chronic pig model.
Methods: Young's modulus and tensile strength of BNC patches were determined before and after blood exposure. Muscular VSDs were created and closed with a BNC patch on the beating heart in an in vivo pig model. Hearts were explanted after 7, 30 or 90 days. Macropathology, histology and immunohistochemistry were performed.
Results: Young's modulus and tensile strength of the BNC patch decreased after blood contact from 6.3 ± 1.9 to 3.86 ± 2.2 MPa (P < 0.01) and 0.33 ± 0.06 to 0.26 ± 0.06 MPa (P < 0.01), respectively, indicating the development of higher elasticity. Muscular VSDs were closed with a BNC patch without residual shunting. After 90 days, a mild chronic inflammatory reaction was present. Moreover, there was reduced tissue overgrowth in comparison with polyester. Proceeding cellular organization characterized by fibromuscular cells, production of extracellular matrix, neoangiogenesis and complete neoendothelialization were found. There were no signs of thrombogenicity.
Conclusions: BNC patches can close VSDs with good mid-term results and its biocompatibility can be considered as satisfactory. Its elasticity increases in the presence of blood, which might be advantageous. Therefore, it has potential to be used as an alternative patch material in congenital heart disease.
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| http://dx.doi.org/10.1093/ejcts/ezu292 | DOI Listing |
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