增加血管后负荷测量对严重大动脉狭窄的流量和存活率的影响
Sara L Hungerford1,2,3, Ning Song4,5,6, Brandon Loo5
1The CardioVascular Center, Tufts Medical Center, 800 Washington Street, Boston, MA 02111, USA.
European heart journal. Cardiovascular Imaging
|January 23, 2025
概括
在严重的大动脉狭窄时,血压升高和血管后负荷会降低大动脉外流率 (TFR). 较低的TFR (≤210毫升/秒) 预测了正常血压患者的死亡率.
科学领域:
- 心血管医学 心血管医学
- 血液动力学 血液动力学
- 膜心脏疾病 膜心脏疾病
背景情况:
- 在大动脉狭窄 (AS) 中,全身循环和脑外流量 (TFR) 之间的关系是假设的,但以前没有证明.
- 严重的AS (大动脉面积≤1厘米2) 在理解血液动力学参数方面提出了独特的挑战.
研究的目的:
- 探索血压 (BP),血管后负荷,高血压史,TFR和严重AS患者的存活率之间的关系.
- 在接受过导管大动脉置换 (TAVR) 的患者中研究影响TFR的因素.
主要方法:
- 研究了323名接受TAVR的患者 (≥65岁),包括5年的前性和注册数据.
- 用多普勒心声学测量的大动脉流量;TFR用数学计算.
- 高血压定义为血压≥140/90 mmHg和/或平均动脉压≥90 mmHg.
主要成果:
- 较高的缩血压,脉压,血管阻力,特征阻抗和较低的动脉顺应与TFR降低有关.
- 在注册表分析中,较低的TFR与高血压史,冠状动脉疾病 (CAD),透析依赖以及增加抗高血压药物的使用有关.
- 在正常血压患者中,TFR≤210mL/s是最强的死亡率预测因子.
结论:
- 升高的血管后负荷和诸如动脉样硬化等并发症在严重的AS中独立降低TFR.
- 低TFR (≤210毫升/秒) 预测严重AS的死亡率,强调BP评估的重要性.
- 研究结果强调了全身血动力学与严重大动脉狭窄的结果之间的相互作用.
关键词:
大动脉狭窄症是什么血压 血压 血压 血压超声心电图 (Echocardiography) 是一种心声回声仪.流量 流量 流量 流量 流量 流量这种高血压,高血压.左心室的功能是没有的.血管后负荷的增加更多相关视频
09:24O-Ring Aortic Banding Versus Traditional Transverse Aortic Constriction for Modeling Pressure Overload-Induced Cardiac Hypertrophy
Published on: October 6, 2022
3.4K
08:49Author Spotlight: Enhancing Graft Viability Assessment Through Quantitative Metrics and Innovative Reservoir Systems
Published on: August 2, 2024
657
相关概念视频
Regulation of Stroke Volume
3.1K
The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
3.1K
Cardiac Output II: Effect of Stroke Volume on Cardiac Output
637
Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
637
Autoregulation of Blood Flow
2.2K
Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation....
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation....
2.2K
Vascular Resistance
3.3K
Vascular resistance is a critical concept in understanding blood flow dynamics in the circulatory system. It refers to the resistance that blood encounters as it flows through the blood vessels. This resistance is a key factor in determining blood pressure and cardiac workload.
The primary determinants of vascular resistance are vessel diameter, blood viscosity, and vessel length. Among these, vessel diameter plays the most significant role due to the fourth power relationship described by...
The primary determinants of vascular resistance are vessel diameter, blood viscosity, and vessel length. Among these, vessel diameter plays the most significant role due to the fourth power relationship described by...
3.3K
Imbalances in Cardiac Output
1.3K
The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...
1.3K
Blood Flow
66.6K
Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
66.6K
