Related Experiment Video

Updated: May 5, 2026

Fundus Photography as a Convenient Tool to Study Microvascular Responses to Cardiovascular Disease Risk Factors in Epidemiological Studies
10:11

Fundus Photography as a Convenient Tool to Study Microvascular Responses to Cardiovascular Disease Risk Factors in Epidemiological Studies

Published on: October 22, 2014

18.5K

Factors associated with changes in retinal microcirculation after antihypertensive treatment

P R Antonio1, P S Marta1, D D J Luís2

  • 1Department of Internal Medicine, Hospital de Conxo Medicine Deparment, Complexo Hospitalario Universitario de Santiago de Compostela, Spain.

Journal of Human Hypertension
|November 22, 2013
PubMed

Insights

Effective hypertension treatment improved retinal microcirculation in 189 patients. Blood pressure control led to increased retinal arteriole diameter, suggesting better blood flow and eye health after six months.

Area of Science:

  • Ophthalmology
  • Cardiology
  • Medical Research

Background:

  • Hypertension is a significant risk factor for cardiovascular and cerebrovascular diseases.
  • Retinal microcirculation changes can indicate systemic vascular health.
  • Assessing retinal arteriole narrowing is crucial for monitoring hypertensive patients.

Purpose of the Study:

  • To investigate the impact of antihypertensive treatment on retinal arteriole diameter.
  • To analyze the relationship between blood pressure control and retinal microcirculation.
  • To evaluate changes in the arteriovenous ratio (AVR) as an indicator of retinal vascular health.

Main Methods:

  • Observational study of 189 hypertensive patients under clinical practice conditions.
  • Analysis of digital eye fundus photographs using a semiautomatic snakes method.
  • Measurement of retinal arteriole and venous diameters to calculate the arteriovenous ratio (AVR).

Main Results:

  • After 6 months, 74.0% of patients achieved blood pressure control.
  • A significant increase in the arteriovenous ratio (AVR) was observed in both eyes (P<0.0001).
  • Increased arteriole diameter, not venous diameter, drove the AVR changes, indicating improved retinal microcirculation.

Conclusions:

  • Adequate blood pressure control in hypertensive patients can improve retinal microcirculation.
  • Increased retinal arteriole diameter suggests a positive response to hypertension treatment.
  • While a trend exists, a direct linear correlation between blood pressure reduction and AVR increase was not established, suggesting other factors may influence retinal changes.

More Related Videos

Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography07:23

Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography

Published on: March 26, 2020

8.1K
Using Retinal Imaging to Study Dementia09:17

Using Retinal Imaging to Study Dementia

Published on: November 6, 2017

21.1K

Related Concept Videos

Diabetic Retinopathy01:27

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
65
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...
3.8K
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,...
1.8K
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...
891
Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors01:30

Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors

Angiotensin-converting enzyme (ACE), a vital component of the renin-angiotensin-aldosterone system, is abundant in lung endothelial cells. ACE converts the inactive decapeptide, angiotensin I, into the active octapeptide, angiotensin II. This potent vasoconstrictor narrows blood vessels, increasing resistance to blood flow and elevating blood pressure. Angiotensin II also stimulates aldosterone production, encouraging kidney cells to reabsorb more sodium and water from urine, thereby increasing...
2.7K
Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response01:15

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response

Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
501