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Related Concept Videos

Hypertension III: Clinical Manifestations and Diagnostic Studies01:30

Hypertension III: Clinical Manifestations and Diagnostic Studies

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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 and Regulation of Blood Pressure01:18

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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...
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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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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.
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Related Experiment Video

Updated: May 4, 2026

Non-invasive Assessment of Microvascular and Endothelial Function
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Microcirculation in hypertensive patients.

F Jung1, G Pindur2, P Ohlmann3

  • 1Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies, Helmholtz-Zentrum Geesthacht, Teltow, Germany.

Biorheology
|January 9, 2014
PubMed
Summary
This summary is machine-generated.

Hypertension causes early microcirculatory disorders in 93% of patients, affecting skin, retinal, and muscle capillaries. These systemic changes are linked to disease progression and long-term complications.

Keywords:
Hypertensionblood fluiditymicrocirculationoxygen partial pressure

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Area of Science:

  • Cardiovascular Medicine
  • Nephrology
  • Vascular Biology

Background:

  • Long-standing hypertension leads to systemic vascular changes affecting both macro and microvasculature.
  • Microcirculation is crucial for tissue oxygen and nutrient supply, making its integrity vital for organ function.
  • Early detection of microvascular alterations in hypertension is key to understanding disease progression.

Purpose of the Study:

  • To review clinical findings on microcirculatory changes in hypertensive patients over three decades.
  • To investigate the early manifestations and systemic nature of microvascular disorders in essential hypertension.

Main Methods:

  • Intravital microscopy for skin microcirculation.
  • Microcatheters for skeletal muscle microcirculation analysis.
  • Slit lamp for conjunctival microcirculation.
  • Laser scanning ophthalmoscopy for retinal capillary network measurement.

Main Results:

  • Microcirculatory disorders were found in 93% of hypertensive patients, preceding clinical organ dysfunction.
  • Earliest changes observed in skin capillaries, followed by retina and skeletal muscle.
  • Decreased capillary erythrocyte velocity and blunted postischemic hyperemia correlated with hypertension severity.

Conclusions:

  • Microcirculatory disorders in hypertension are systemic and indicative of long-term complications.
  • These vascular changes occur early and play a significant role in hypertension's pathogenesis and progression.