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Related Concept Videos

Heart Failure Drugs: Inhibitors of Renin-Angiotensin System01:26

Heart Failure Drugs: Inhibitors of Renin-Angiotensin System

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The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
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Endothelins (ETs) are potent vasoactive peptides critical in the human body's various physiological and pathological processes. One of the most promising therapeutic strategies for treating pulmonary arterial hypertension (PAH) involves counteracting the effects of these endothelins using a class of drugs known as endothelin receptor antagonists.
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Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors01:30

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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...
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Heart Failure Drugs: Diuretics01:22

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Heart failure and kidney perfusion are interconnected in a complex way. Reduced renal perfusion and venous congestion are two significant factors that contribute to renal dysfunction in heart failure. The kidneys, primarily responsible for fluid balance in the body, are adversely affected due to compromised cardiac output and increased venous pressure. In response to reduced renal perfusion, the kidneys activate neurohumoral mechanisms to restore balance. However, these mechanisms can be...
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Pathophysiology of Heart Failure01:17

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Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
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Antihypertensive Drugs: Angiotensin II Receptor Blockers01:30

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In the renin-angiotensin-aldosterone system, a hormone called angiotensin II plays a crucial role. It binds to the AT1 receptors in vascular smooth muscles coupled with Gq proteins. The activation of these receptors activates an enzyme called phospholipase C, which releases two molecules: inositol trisphosphate and diacylglycerol. These molecules cause a chain reaction that leads to the phosphorylation of myosin light chains and promotes interaction between actin and myosin, leading to smooth...
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Related Experiment Video

Updated: May 17, 2025

Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation
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Hypertension Exacerbates Endothelial Dysfunction in Patients With Atrial Fibrillation.

Samuel Thomas1, Fiona L Wilkinson1, Amy R Bland2

  • 1Department of Life Sciences, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester, UK.

Journal of Clinical Hypertension (Greenwich, Conn.)
|April 7, 2025
PubMed
Summary
This summary is machine-generated.

Atrial fibrillation patients with hypertension show poorer brachial artery flow-mediated dilation, indicating worsened endothelial dysfunction. This suggests hypertension exacerbates vascular issues in AF patients.

Keywords:
atrial fibrillationflow‐mediated dilatationhypertensionshear stress

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Area of Science:

  • Cardiovascular Medicine
  • Vascular Biology
  • Endothelial Function Research

Background:

  • Atrial fibrillation (AF) and hypertension (HT) are common comorbidities.
  • Both AF and HT are independently linked to endothelial dysfunction.
  • Endothelial dysfunction is a key factor in cardiovascular disease development.

Purpose of the Study:

  • To investigate if brachial artery flow-mediated dilation (FMD) is poorer in AF patients with concurrent HT compared to those without HT.
  • To assess the impact of comorbid HT on endothelial health in patients with AF.

Main Methods:

  • Cross-sectional study comparing AF patients (n=29) and AF with HT patients (n=33).
  • Duplex-Doppler ultrasound used to measure brachial artery diameter and flow velocity.
  • Flow-mediated dilation (FMD) analyzed using various metrics, including shear-rate area-under-the-curve (SRAUC), with BMI as a covariate.

Main Results:

  • AF patients with HT had significantly higher mean arterial pressure than AF patients alone.
  • Brachial artery FMD was significantly lower in the AF + HT group compared to the AF group (3.36% vs. 4.98%).
  • Similar significant reductions in FMD were observed across absolute FMD, FMD-to-SRAUC ratio, and FMDSRAUC metrics.

Conclusions:

  • Concurrent hypertension significantly exacerbates endothelial dysfunction in patients with atrial fibrillation.
  • Poorer endothelium-dependent vasodilation in AF patients with HT highlights the detrimental combined effect of these conditions.
  • Findings underscore the importance of managing hypertension in AF patients to mitigate vascular complications.