Bre L P, McCarthy R, Wang W
Network of Excellence for Functional Biomaterials (NFB), National University of Ireland, Galway, IDA Business Park, Dangan, Galway, Ireland.
Curr Med Chem. 2014;21(22):2553-64. doi: 10.2174/0929867321666131212151216.
Despite the significant advances in cardiac surgery, heart valve replacement still faces a dilemma. While mechanical valves offer lifelong durability they also commit patients to anticoagulation treatment for the rest of their life. On the other hand, bioprosthetic valves have superior hemodynamic performance but durability of the bioprosthesis limits their use to the elderly, with early onset calcification being the primary cause of biomaterial breakdown. Considering that bioprosthetic valves are not reliant upon anticoagulation, there has been much focus on measures to overcome their issues with durability. Firstly, the calcification process has been studied and factors such as young patient age, use of glutaraldehyde fixative, the presence of phospholipids along with cell debris in the valve tissue and mechanical stress have been identified to influence tissue mineralization. Therefore different calcification reduction strategies are being sought: new fixatives have been developed and tested and post-treatments have been added to tissue processing. This review presents the pathophysiology of tissue valve calcification and focuses on the multiple approaches developed to prevent bioprosthetic heart valve calcification, as well as on their general outcomes and translation to clinical applications.
尽管心脏外科手术取得了重大进展,但心脏瓣膜置换仍面临困境。机械瓣膜虽然具有终身耐用性,但也使患者终身都要接受抗凝治疗。另一方面,生物瓣膜具有优越的血流动力学性能,但生物假体的耐用性限制了它们仅用于老年人,早期钙化是生物材料损坏的主要原因。鉴于生物瓣膜不依赖抗凝治疗,人们一直非常关注克服其耐用性问题的措施。首先,已经对钙化过程进行了研究,并且已确定诸如年轻患者年龄、戊二醛固定剂的使用、瓣膜组织中磷脂以及细胞碎片的存在和机械应力等因素会影响组织矿化。因此,正在寻求不同的减少钙化策略:已开发并测试了新的固定剂,并在组织处理过程中增加了后处理。本综述介绍了组织瓣膜钙化的病理生理学,并重点关注为预防生物人工心脏瓣膜钙化而开发的多种方法,以及它们的总体结果和向临床应用的转化。
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