自扩展假肢适应:非均扩展和支架脱
Marco Moscarelli1, Giulia Sollami2, Emanuele Lentini1
1Departments of Cardiovascular Surgery, Maria Eleonora Hospital, GVM Care & Research, Palermo, Italy.
The American journal of cardiology
|September 21, 2023
概括
自扩展式透导体心脏 (THV) 替换后,不均的扩张和支架架脱是常见的,影响了的性能. 需要进一步的研究来了解这些发现的临床影响.
科学领域:
- 心血管成像 - 心血管成像
- 医疗设备工程 医疗设备工程
- 干预心脏病学 干预心脏病学
背景情况:
- 在可自扩展的跨导管心脏门 (THV) 中,不均的扩张和支架框架脱不是很好地理解的现象.
- 支架脱包括下部THV支架适应左心室外流通道的圆性,而上部保持圆形.
研究的目的:
- 调查在植入后的自扩展THV中不均扩张和支架框架脱的发生率和特征.
- 评估这些现象与其他植入参数之间的关系.
主要方法:
- 对50名患者植入后多探测器计算机断层扫描的分析.
- 在六个定义的水平上量化假肢异常度,以评估不均的膨胀.
- 通过对不同层次的异心率进行比较,以评估支架-支架脱.
- 计算植入深度,叶片扩张/对齐和鼻腔区域比率.
主要成果:
- 在12个月后,在所有膜水平上始终检测到不均的扩张.
- 观察到最高的离心率是在本地环 (0.54 ± 0.12),最低的是在框架外流 (0.23 ± 0.11).
- 观察到从圆环到框架外流的异心率显著下降 (p <0.001).
- 轻度至重度的亚临床传单血栓发生在16%的患者中.
结论:
- 假肢不均扩张和支架脱是自扩展THV植入后经常发生的情况.
- 这些发现的临床和血液动力学意义需要进一步调查.
更多相关视频
12:17Full-root Aortic Valve Replacement by Stentless Aortic Xenografts in Patients with Small Aortic Roots
Published on: May 21, 2017
11.4K
05:31Transcatheter Pulmonary Valve Replacement from Autologous Pericardium with a Self-Expandable Nitinol Stent in an Adult Sheep Model
Published on: June 8, 2022
2.9K
相关概念视频
Ankle Joint
The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
Thermal expansion and Thermal stress: Problem Solving
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.
Support Reactions
A coplanar force system refers to a set of forces that all lie in the same plane and are subject to different reactions between the point of contact and the supports. Understanding how different types of supports affect coplanar forces is crucial for designing safe and reliable structures that can withstand external loads.
The purpose of the supports is to prevent the translational motion of the system by applying an equal and opposite force and to prevent the system's rotation by applying a...
The purpose of the supports is to prevent the translational motion of the system by applying an equal and opposite force and to prevent the system's rotation by applying a...
Deformation of Member under Multiple Loadings
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
Plastic Deformations
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their original...
Expansion and Contraction in Masonry Walls
Masonry walls are subject to slight expansion and contraction due to variations in temperature and moisture. Thermal movement in masonry is relatively straightforward to measure and plan for. On the other hand, moisture movement poses more of a challenge. New clay masonry units typically absorb water and expand over time under normal environmental conditions. Conversely, new concrete masonry units tend to shrink as they lose the excess moisture acquired during their production process.
To...
To...
