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相关概念视频

The Parasympathetic Nervous System01:14

The Parasympathetic Nervous System

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Overview
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Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

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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....
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Alterations in Blood Pressure01:30

Alterations in Blood Pressure

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Alterations in blood pressure, such as hypertension (high blood pressure) and hypotension (low blood pressure), significantly affect human health. Understanding these conditions' classifications, causes, and symptoms is essential for effective management and treatment.
Hypertension (High blood pressure)
Hypertension occurs when blood pressure readings consistently exceed the normal range. It is diagnosed when systolic blood pressure (the top number, indicating pressure while the heart...
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Disorders of the Autonomic Nervous System01:18

Disorders of the Autonomic Nervous System

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The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
Raynaud's disease, also known as Raynaud's...
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Measurement of Blood Pressure01:17

Measurement of Blood Pressure

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Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a...
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Blood Flow01:29

Blood Flow

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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.
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Updated: May 29, 2025

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
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在正态不耐受症中脑血流.

Muhammad Shahzeb Khan1, Amanda J Miller2, Arooba Ejaz3

  • 1Department of Medicine Duke University Medical Center Durham Durham NC USA.

Journal of the American Heart Association
|February 3, 2025
PubMed
概括
此摘要是机器生成的。

脑血流 (CBF) 调节受损导致静态不耐受 (OI) 症状. 直接测量CBF,而不仅仅是心率或血压,对于诊断和治疗各种OI综合征,如慢性疲劳综合征和长期COVID至关重要.

关键词:
ME/CFS 的意思是 ME/CFS 的意思.波特斯 (Potts) 的意思是说.大脑的血液流动.长时间的COVID.静态不耐受性 静态不耐受性

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科学领域:

  • 神经学 神经学
  • 心脏病学 心脏病学
  • 身体生理学 身体生理学

背景情况:

  • 大脑血流 (CBF) 对于大脑的氧气和营养供应至关重要.
  • 静态不耐受性 (OI) 涉及受损的直立CBF调节,导致衰弱的症状.
  • 目前的诊断代理,如心率和血压变化,对于许多OI综合征是不够的.

研究的目的:

  • 审查关于OI综合征中CBF功能障碍的文献.
  • 评估测量OI患者CBF的方法.
  • 突出说明静态低 perfusion 作为一个统一的 OI 的病理生理学.

主要方法:

  • 对OI中CBF的现有科学文献的审查.
  • 评估用于测量CBF的诊断技术.
  • 分析涉及跨骨多普勒超声波,外脑脑血流超声波,近红外光谱学和可穿戴设备的研究.

主要成果:

  • 许多OI综合征,包括肌痛性脑膜炎/慢性疲劳综合征和长期COVID,尽管CBF下降显著,但心率和血压正常.
  • 依赖心率和血压可能导致误诊和缺乏治疗.
  • 静态静脉输液被确定为在各种OI条件中常见的潜在问题.

结论:

  • 对于准确的OI诊断,CBF的直接测量是必要的.
  • 在某些OI条件下,标准的血液动力学测量不足以识别CBF异常.
  • 准确的CBF评估对于理解和治疗OI的全谱至关重要.