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Related Concept Videos

Hypertension and Regulation of Blood Pressure01:18

Hypertension and Regulation of Blood Pressure

Hypertension, the most common cardiovascular disease, is diagnosed through repeated measurements of elevated blood pressure. Its risks, including damage to the kidney, heart, and brain, are directly proportional to blood pressure levels. Starting from 115/75 mm Hg, the risk of cardiovascular disease doubles with each increment of 20/10 mm Hg. The diagnosis relies on blood pressure measurements, not on patient symptoms, as hypertension is often asymptomatic until end-organ damage is imminent or...
Hypertension II: Pathophysiology01:29

Hypertension II: Pathophysiology

Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
Blood Pressure01:30

Blood Pressure

Blood pressure (BP) is the pressure or force of blood exerted on the artery's walls as it circulates through the body. It is essential for maintaining blood flow throughout the body.
The average BP in an adult is typically around 120/80 mmHg (millimeters of mercury). In this measurement, the numerator (120) indicates the systolic pressure, which is the pressure in the arteries during the contraction of the heart's ventricles as blood is expelled. The denominator (80) represents the diastolic...
Blood Pressure01:24

Blood Pressure

The movement of blood in a human body, commonly referred to as blood flow, is determined by the volume of blood that traverses a certain section of the bodily system per unit time. It is the rhythmic contraction of the heart's ventricles that primarily instigates this movement. As the ventricles contract, blood is forced into the prominent arteries, which then flow from areas of greater pressure to lower pressure areas. This movement continues into smaller arteries and arterioles and...
Hypertension III: Clinical Manifestations and Diagnostic Studies01:30

Hypertension III: Clinical Manifestations and Diagnostic Studies

Hypertension is asymptomatic and also referred to as the "silent killer" until it progresses to a severe stage or causes target organ disease. Patients may experience symptoms stemming from the strain on blood vessels and tissues in various organs or the heart's increased workload.Physical exams might show no abnormalities other than high blood pressure. Signs of vascular damage, when present, correspond to the organs supplied by the affected vessels, leading to target organ damage. For...
Hormonal Regulation of Blood Pressure01:17

Hormonal Regulation of Blood Pressure

Endocrinal or hormonal intervention in the cardiovascular system is predominantly exerted by the catecholamines - epinephrine and norepinephrine, as well as a slew of hormones that interact with renal function to modulate blood volume.
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction while...

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Related Experiment Video

Updated: Jun 25, 2026

Assessing Endothelial Vasodilator Function with the Endo-PAT 2000
07:46

Assessing Endothelial Vasodilator Function with the Endo-PAT 2000

Published on: October 15, 2010

Exercise blood pressure and endothelial dysfunction in hypertension.

N Tzemos1, P O Lim, T M MacDonald

  • 1Division of Medicine & Therapeutics, Hypertension Research Centre, Ninewells Hospital & Medical School, University of Dundee, Dundee, UK. nikotzemos@yahoo.co.uk

International Journal of Clinical Practice
|February 7, 2009
PubMed
Summary

Hypertensive patients with an exaggerated systolic blood pressure response during exercise show impaired endothelial function. This simple test may help identify high-risk individuals for better cardiovascular prognosis.

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Ultrasound Assessment of Endothelial Function: A Technical Guideline of the Flow-mediated Dilation Test
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Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research
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Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research

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Related Experiment Videos

Last Updated: Jun 25, 2026

Assessing Endothelial Vasodilator Function with the Endo-PAT 2000
07:46

Assessing Endothelial Vasodilator Function with the Endo-PAT 2000

Published on: October 15, 2010

Ultrasound Assessment of Endothelial Function: A Technical Guideline of the Flow-mediated Dilation Test
06:35

Ultrasound Assessment of Endothelial Function: A Technical Guideline of the Flow-mediated Dilation Test

Published on: April 27, 2016

Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research
08:42

Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research

Published on: October 22, 2014

Area of Science:

  • Cardiovascular Medicine
  • Hypertension Research
  • Endothelial Function Studies

Background:

  • Persistent endothelial dysfunction in hypertensive patients is linked to poor cardiovascular outcomes.
  • Current clinical methods for assessing endothelial dysfunction lack broad applicability.
  • An exaggerated systolic blood pressure response to exercise may indicate endothelial dysfunction.

Purpose of the Study:

  • To investigate if an exaggerated systolic blood pressure response to submaximal exercise can identify hypertensive individuals with endothelial dysfunction.
  • To compare vascular reactivity between hypertensive patients with high and low exercise systolic blood pressure responses.

Main Methods:

  • 22 male hypertensive patients were divided into hyper-responders (ExSBP rise ≥ 40 mmHg) and hypo-responders (ExSBP rise ≤ 20 mmHg) based on a 3-min exercise step test.
  • Vascular reactivity was assessed using forearm venous occlusion plethysmography with intra-arterial infusions of acetylcholine, N(G)-monomethyl-l-arginine (l-NMMA), and sodium nitroprusside.
  • Clinic and ambulatory blood pressure were measured after treatment withdrawal, showing no significant differences between groups.

Main Results:

  • Hyper-responders exhibited significantly reduced forearm vasodilatation to acetylcholine compared to hypo-responders (125% vs. 260% change in forearm blood flow, p < 0.001).
  • Vasoconstrictive response to l-NMMA was impaired in hyper-responders versus hypo-responders (-30% vs. -45%, p < 0.05).
  • Endothelial-independent vasodilatation to sodium nitroprusside did not differ between groups.

Conclusions:

  • Hypertensive patients with an exaggerated exercise systolic blood pressure response demonstrate significantly worse endothelial function, despite similar blood pressure readings.
  • This non-invasive exercise test can aid in the clinical risk stratification of hypertensive patients.
  • The findings suggest a potential role for exercise blood pressure response in assessing cardiovascular prognosis.