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Related Concept Videos

Hypertension II: Pathophysiology01:29

Hypertension II: Pathophysiology

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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,...
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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...
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Hypertension is a widespread, long-term medical condition where blood pressure in the arteries remains elevated. It is characterized by systolic blood pressure readings of 130 mm Hg or above or diastolic blood pressure (DBP) readings of 80 mm Hg or higher. Unmanaged hypertension poses significant health risks, making the distinction between primary (or essential) hypertension and secondary hypertension crucial, as their management and implications vary.Primary HypertensionPrimary hypertension,...
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Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Assessing Murine Resistance Artery Function Using Pressure Myography
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Vascular phenotypes in early hypertension.

Eleanor C Murray1, Christian Delles2, Patryk Orzechowski3,4

  • 1School of Cardiovascular and Metabolic Health, University of Glasgow, Glasgow, UK. Eleanor.Murray3@nhs.scot.

Journal of Human Hypertension
|December 17, 2022
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Summary

Untreated hypertension shows early arterial stiffening, not endothelial dysfunction. Machine learning identified distinct patient clusters based on blood pressure and arterial stiffness, aiding risk stratification.

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Area of Science:

  • Cardiovascular Medicine
  • Hypertension Research
  • Biomedical Engineering

Background:

  • Primary hypertension is a complex condition with varied vascular presentations.
  • Early detection of vascular changes in hypertension is crucial for risk stratification.
  • Machine learning offers novel approaches to characterize disease heterogeneity.

Purpose of the Study:

  • To characterize vascular phenotypes in newly diagnosed, treatment-naïve primary hypertensive patients.
  • To utilize machine learning to identify distinct hypertensive subgroups.
  • To investigate early vascular alterations in incident hypertension.

Main Methods:

  • Recruited 73 primary hypertensive patients and 79 normotensive controls.
  • Assessed 24-hour ambulatory blood pressure (BP) and BP variability.
  • Performed vascular phenotyping including pulse wave velocity (PWV), augmentation index (PWA-AIx), central BP, reactive hyperemia index (LnRHI), and carotid intima-media thickness (CIMT).
  • Applied machine learning (biclustering) to identify hypertensive subgroups.

Main Results:

  • Hypertensive patients exhibited greater arterial stiffness (PWV, PWA-AIx, AI@75) and central pressures compared to normotensive controls.
  • No significant differences were found in endothelial function, nocturnal BP dip, or CIMT between groups.
  • Machine learning identified three clusters: 'arterially stiffened', 'vaso-protected', and 'non-dipper' based on BP and arterial stiffness measures.
  • White-coat hypertension mimicked sustained hypertension, while masked hypertension resembled normotension.

Conclusions:

  • Untreated primary hypertension is characterized by early arterial stiffening rather than endothelial dysfunction or CIMT changes.
  • Phenotypic heterogeneity in BP variability and arterial stiffness exists early in hypertension.
  • These findings suggest potential for improved risk stratification using machine learning-derived phenotypes.