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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 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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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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Hypertension and Regulation of Blood Pressure01:18

Hypertension and Regulation of Blood Pressure

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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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Portal Hypertension01:22

Portal Hypertension

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Portal hypertension is an increase in blood pressure within the portal venous system. Normally, this pressure is less than 5 mmHg. It is considered clinically significant when it rises above 10 mmHg. At this threshold, complications from altered blood flow and venous congestion emerge.EtiologyPortal hypertension arises from conditions that impede blood flow through the liver. The most common cause is cirrhosis, in which chronic liver injury leads to fibrotic scarring. This fibrosis narrows or...
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Hypertension I: Introduction01:28

Hypertension I: Introduction

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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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Related Experiment Video

Updated: May 7, 2026

Fundus Photography as a Convenient Tool to Study Microvascular Responses to Cardiovascular Disease Risk Factors in Epidemiological Studies
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[Hypertensive changes of the fundus].

W Göbel, J Matlach

    Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
    |October 15, 2013
    PubMed
    Summary

    Systemic hypertension, a major cardiovascular risk, causes eye abnormalities like hypertensive retinopathy. Early detection of retinal changes is crucial for managing this common condition.

    Area of Science:

    • Ophthalmology
    • Cardiology
    • Vascular Biology

    Context:

    • Systemic hypertension impacts 25% globally, posing significant cardiovascular disease risks.
    • Hypertension-induced fundus abnormalities include retinopathy, choroidopathy, and optic neuropathy.
    • Retinal findings like hemorrhages and exudates indicate vascular damage due to hypertension.

    Purpose:

    • To differentiate early hypertensive retinopathy from advanced stages with parenchymal changes.
    • To highlight the importance of retinal screening in specific patient populations.
    • To discuss the challenges in grading hypertensive retinopathy due to arteriosclerosis.

    Summary:

    • Hypertensive retinopathy involves retinal arteriole constriction, leading to ischemia and characteristic fundus findings.

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  • Grading systems are complicated by arteriosclerotic changes common in older adults.
  • Distinguishing pure vascular pathology from parenchymal damage is key for accurate diagnosis.

    • Impact:

    • Emphasizes the need for retinal examination in severe hypertension, visual impairment, diabetes, and pregnancy.
    • Highlights hypertension as a preventable risk factor for cardiovascular and visual health.
    • Underscores the clinical significance of identifying fundus abnormalities for patient management.