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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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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.
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Related Experiment Video

Updated: Mar 21, 2026

Ultrasound Assessment of Endothelial Function: A Technical Guideline of the Flow-mediated Dilation Test
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Targeting vascular (endothelial) dysfunction.

Andreas Daiber1,2, Sebastian Steven1,3, Alina Weber1

  • 1Center of Cardiology, Medical Center of the Johannes Gutenberg University, Mainz, Germany.

British Journal of Pharmacology
|May 18, 2016
PubMed
Summary
This summary is machine-generated.

Endothelial dysfunction predicts cardiovascular events, but its prognostic value is debated. Alternative measures like vascular stiffness and intima/media thickness may offer better clinical insights.

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Area of Science:

  • Cardiovascular science
  • Vascular biology
  • Redox biology

Background:

  • Cardiovascular diseases are leading causes of death globally.
  • Hypertension is a major risk factor for cardiovascular mortality.
  • Endothelial dysfunction is an early indicator of atherosclerosis and cardiovascular events.

Purpose of the Study:

  • To review the prognostic value of endothelial function measurements.
  • To discuss clinical techniques, mechanisms, and treatments for endothelial dysfunction.
  • To explore alternative diagnostic parameters for vascular health.

Main Methods:

  • Literature review of endothelial function assessment.
  • Analysis of mechanisms driving endothelial dysfunction.
  • Evaluation of antioxidant and anti-inflammatory therapies.
  • Discussion of alternative vascular health markers.

Main Results:

  • Endothelial dysfunction is linked to atherosclerosis and cardiovascular events.
  • Oxidative stress and inflammation significantly impact endothelial function.
  • Recent data question the prognostic value of endothelial function in healthy individuals.
  • Vascular stiffness index and intima/media thickness ratio are proposed as alternative markers.

Conclusions:

  • Assessing endothelial function is crucial but may have limitations in certain cohorts.
  • Alternative parameters like vascular stiffness and intima/media thickness warrant further investigation.
  • Broader assessment of vascular function, including smooth muscle and adipose tissue, may be clinically valuable.