概括
mitra 的非侵入性心声回声学可以准确地估计转移性血流. 这种方法反映了心交叶片运动,提供了一种在没有侵入性流量计的情况下研究各种心脏病的血液流动的方法.
科学领域:
- 心血管生理学心血管生理学
- 心声回声扫描 (Echocardiography) 是一种心声回声扫描.
- 血液动力学 血液动力学
背景情况:
- 精确测量传导血流对于理解心脏功能至关重要.
- 目前的方法往往需要侵入性手术,这限制了它们在某些患者群体中的应用.
- 寻求非侵入性技术来评估血液流动动态的非侵入性.
研究的目的:
- 评估使用中枢声谱来评估转移性血流的可行性.
- 为了建立前额叶叶片运动和血液流动动力学之间的相关性.
- 探索一种非侵入性方法来研究各种病理状态中的传导性血液流动.
主要方法:
- 随着时间的推移,左心室体积的数值差异化被用来计算传导性血流.
- 在11名接受心脏导管治疗的患者中,进行了心交膜回声心脏成像.
- 分析了关叶片的运动模式,并与计算的血液流量进行了比较.
主要成果:
- 在传导性血液流动的模式和前额头肌叶片的透静运动之间观察到很强的相似性.
- 伴心叶片回声曲线下的集成区域与进入左心室的中风体积百分比密切相关.
- 研究人员发现,心交叶片运动准确地反映了传导流动的动态.
结论:
- 前额头叶片回声图可以非侵入性地近似透气期间传导性血流的相对速度和体积.
- 这种心声回声学方法提供了一种有价值的,非侵入性的工具,用于在各种临床环境中研究传导性血液流动.
- 这些发现支持这样一个假设,即关叶片运动可以作为传导流的可靠指标.
相关概念视频
Blood Flow
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.
Characteristics and Functions of Blood
Blood is specialized connective tissue comprising about 8% of the body mass. It has a thick, liquid extracellular matrix that contains cells, dissolved proteins, and electrolytes, making it five times more viscous than water. Blood is warm, around 38°C, and has an alkaline pH ranging from 7.35 to 7.45.
The primary function of blood is to transport oxygen and carbon dioxide between tissues and the lungs. Oxygenated blood is bright red, while oxygen-depleted blood is darker. It also carries...
The primary function of blood is to transport oxygen and carbon dioxide between tissues and the lungs. Oxygenated blood is bright red, while oxygen-depleted blood is darker. It also carries...
Vascular Spasm
The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
Extrinsic and Intrinsic Pathways of Hemostasis
Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
Autoregulation of Blood Flow
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.
Arteries of the Head and Neck
The human body's intricate network of arteries ensures that every organ system receives the necessary oxygen and nutrients for optimal function. The arterial network in the head and neck region is particularly complex, providing vital blood flow to the brain, eyes, and other critical structures. Prominent arteries in this region include the internal carotid arteries and the vertebral arteries.
The internal carotid arteries supply blood to the anterior portion of the cerebrum. They enter the...
The internal carotid arteries supply blood to the anterior portion of the cerebrum. They enter the...


