非侵入性压力-体积循环衍生时弹性,收缩性和效率指数,用于评估杜申肌缩症患者
Israel O Ajiboye1, Sean M Lang2, Michael D Taylor2
1Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH, USA.
Heart and vessels
|December 28, 2024
概括
排泄分数可能无法检测杜氏肌力衰竭相关心肌病 (DMDAC) 的早期心脏功能障碍. 对心脏弹性,收缩性和效率的新型非侵入性测量为DMDAC患者提供了更好的纵向评估.
科学领域:
- 心脏病学 心脏病学
- 生物医学工程 生物医学工程
- 遗传学 是一个遗传学.
背景情况:
- 杜氏肌力衰竭相关心肌病变 (DMDAC) 对患者构成重大风险.
- 射出分数 (EF) 是评估DMDAC的标准但潜在不敏感的指标.
- 对于纵向监测,需要更敏感的心肌功能障碍指标.
研究的目的:
- 评估非侵入性左心室 (LV) 压力-体积 (PV) 循环衍生弹性,收缩性和效率作为DMDAC患者EF的替代品.
- 评估这些新型指数与EF的相关性,以及它们在不同EF患者组之间区分的能力.
- 确定这些参数对DMDAC的纵向评估和治疗评估的有用性.
主要方法:
- 对30名DMDAC患者进行了连续心脏磁共振成像 (CMR) 的回顾性研究.
- 获得手臂压力和LVCMR图像.
- 应用基于时间弹性的一种非侵入性PV循环算法来推导平均弹性,收缩性和效率.
主要成果:
- 平均弹性和收缩性与EF有中等的相关性 (r=0.56,p<0.01和r=0.65,分别p<0.001).
- 心脏效率与EF有很强的相关性 (r=0.97,p<0.01).
- 在EF<55%的患者中,与EF≥55% (p<0.001) 的患者相比,观察到显著较低的平均弹性,效率和收缩性.
结论:
- 非侵入性LV PV循环衍生的弹性,收缩性和效率是DMDAC中心肌功能有前途的指标.
- 这些指数与EF相关性很好,并且可以区分具有不同EF水平的患者群体.
- 这些参数可以作为DMDAC的纵向评估和管理的有价值的诊断终点.
相关概念视频
Pulse amplitude and quality
Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped.
A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...
A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...
Plastic Behavior
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and reloaded.
Bulk Modulus
The bulk modulus is a scientific term used to describe a material's resistance to uniform compression. It is the proportionality constant that links a change in pressure to the resulting relative volume change.
Residual Stresses in Bending
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
Strain-Energy Density
Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this region...
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this region...
Elastic Strain Energy for Normal Stresses
Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
If...
If...


