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Assessing Anticalcification Treatments in Bioprosthetic Tissue by Using the New Zealand Rabbit Intramuscular Model

机译:使用新西兰兔肌内模型评估生物修复组织中的抗钙化治疗

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The objective of this work was to demonstrate that the New Zealand White (NZW) rabbit intramuscular model can be used for detecting calcification in bioprosthetic tissue and to compare the calcification in the rabbit to that of native human valves. The rabbit model was compared with the commonly used Sprague-Dawley rat subcutaneous model. Eighteen rabbits and 18 rats were used to assess calcification in bioprosthetic tissue over time (7,14,30, and 90 d). The explanted rabbit and rat tissue discs weremeasured for calcium by using atomic absorption and Raman spectroscopy. Calcium deposits on the human valve explants were assessed by using Raman spectroscopy. The results showed that the NZW rabbit model is robust for detecting calcification in a shorter duration (14 d), with less infection complications, more space to implant tissue groups (thereby reducing animal use numbers), and a more metabolically and mechanically dynamic environment than the rat subcutaneous model. The human explanted valves and rabbit explanted tissue both showed Raman peaks at 960 cm~(-1) which is representative of hydroxyapatite. Hydroxyapatite is the final calcium and phosphate species in the calcification of bioprosthetic heart valves and rabbit intramuscular implants. The NZW rabbit intramuscular model is an effective model for assessing calcification in bioprosthetic tissue.
机译:这项工作的目的是证明新西兰白(NZW)兔肌内模型可用于检测生物假体组织中的钙化,并将兔中的钙化与天然人瓣膜中的钙化进行比较。将兔子模型与常用的Sprague-Dawley大鼠皮下模型进行了比较。 18只兔子和18只大鼠被用来评估生物修复组织随时间(7、14、30和90 d)的钙化。通过原子吸收和拉曼光谱法测量移植的兔和大鼠组织盘中的钙。使用拉曼光谱法评估人瓣外植体上的钙沉积。结果表明,NZW兔模型可在较短的时间内(14天)检测钙化,感染并发症更少,植入组织组的空间更大(从而减少了动物的使用数量),并且在代谢和机械动力学环境方面比大鼠皮下模型。人体离体瓣和兔离体组织均在960 cm〜(-1)处出现拉曼峰,这是羟磷灰石的代表。羟基磷灰石是生物人工心脏瓣膜和兔肌内植入物中钙化的最终钙和磷酸盐种类。 NZW兔肌内模型是评估生物假体组织钙化的有效模型。

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