相关实验视频
Updated: Jun 11, 2025

09:40
Magnetic Adjustment of Afterload in Engineered Heart Tissues
Published on: May 5, 2020
5.9K
机械负荷和荷尔蒙变化的贡献在体积过载时异常增大:使用基于逻辑的网络模型的贝叶斯分析
Johane H Bracamonte1, Lionel Watkins2, Betty Pat3,4
1Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, Alabama, United States of America.
bioRxiv : the preprint server for biology
|September 30, 2024
概括
主要额头回 (MR) 导致左心室的变化. 一个新的模型显示神经激素反应,而不仅仅是应变,驱动这种心脏缩,有助于个性化治疗MR患者.
科学领域:
- 心脏病学 心脏病学
- 系统生物学 系统生物学
- 计算生物学 计算生物学
背景情况:
- 主要的额頭肌反 (MR) 会导致左心室 (LV) 重塑和古怪的缩.
- 目前对MR的治疗方法,包括手术,也有局限性,20%的患者经历了手术后的缩功能障碍.
- 对于MR的最佳外科手术时间尚不清楚,需要更深入地了解心室体积过载 (VO) 中的缩过程.
研究的目的:
- 开发心脏缩的定量模型,以应对心室体积过载 (VO).
- 在实验性VO中调查过度缩生长的主要驱动因素.
- 预测对MR诱导的心脏缩的干预措施的影响.
主要方法:
- 用贝叶斯的方法结合了来自70项对狗和老鼠实验性VO研究的数据.
- 使用这些数据校准了一个基于逻辑的网络模型,用于在肌细胞中进行高缩信号传输.
- 该模型的预测与43项独立研究进行了验证.
主要成果:
- 校准模型预测神经激素反应,而不是肌细胞菌株,是实验性VO中缩的主要驱动因素.
- 心肌组织伸展的早期增加被VO时间线相对早期的重塑所补偿.
- 该模型成功地重现了各种实验结果,包括对多变性激动剂和心力衰竭药物的反应.
结论:
- 这项研究提出了一种新的计算方法来模拟心脏缩.
- 这些发现表明神经激素信号传递在VO诱导的缩中发挥的作用比以前想象的要大.
- 开发的模型为预测患者对MR和心脏缩干预措施的反应提供了一个有希望的工具.
相关概念视频
General Case of Eccentric Axial Loading
178
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
178
Eccentric Loading
326
Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
326
Eccentric Axial Loading in a Plane of Symmetry
165
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
165
Design of Columns under an Eccentric Load
464
Designing columns to withstand eccentric loads is a critical aspect of structural engineering, ensuring structures can support off-center loads without failure. This design process must account for the additional normal stresses introduced by eccentric loading, which can significantly influence a column's stress distribution and overall stability. An eccentric load applied to a column induces normal stresses that can be conceptualized as a combination of stresses due to an equivalent...
464
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
253
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
253
Heart Failure II: Pathophysiology
3
Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
3

