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Is skeletal muscle ventricle chronic stability dependent on wall stress? Design implications.

机译:骨骼肌心室的慢性稳定性是否取决于壁应力?设计意义。

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Chronic skeletal muscle ventricle (SMV) stability is essential for clinical implementation. SMVs in animal models have chronically expanded or collapsed when exposed to physiologic pressures. SMV wall stress is a more appropriate indicator than pressure or geometry to compare SMVs between studies. SMV wall tensions during conditioning were determined for SMVs that collapsed, expanded, or were isovolumetric in a previous study. Wall stresses in SMVs that expanded (2.76 +/- 0.803 N/cm(2)) were significantly greater than isovolumetric SMVs (0.89 +/- 0.450) and SMVs that collapsed (0.88 +/- 0.451). These data support the existence of minimum and maximum wall stresses for SMV volume stability and provide empiric estimates for SMV design. Scaling SMV designs from animal models with smaller volumes and similar pressures may result in greater wall stresses in clinical designs. Therefore, the use of volume limiting implants or an isovolumetric conditioning phase to increase the wall stress expansion threshold may be required.
机译:慢性骨骼肌心室(SMV)的稳定性对于临床实施至关重要。当暴露于生理压力下时,动物模型中的SMV会长期膨胀或塌陷。 SMV壁应力比压力或几何形状更适合用于比较研究之间的SMV。在先前的研究中,确定了塌陷,膨胀或等容的SMV在调节期间的SMV壁张力。扩展的SMV中的壁应力(2.76 +/- 0.803 N / cm(2))明显大于等容SMV(0.89 +/- 0.450)和塌陷的SMV(0.88 +/- 0.451)。这些数据支持SMV体积稳定性存在最小和最大壁应力,并为SMV设计提供经验估计。用较小体积和类似压力的动物模型缩放SMV设计可能会在临床设计中导致更大的壁应力。因此,可能需要使用体积限制植入物或等容调节阶段来增加壁应力膨胀阈值。

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