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Related Concept Videos

Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

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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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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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Imbalances in Cardiac Output01:26

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...
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Heart Failure I: Introduction01:27

Heart Failure I: Introduction

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Heart failure refers to a clinical syndrome caused by structural or functional cardiac disorders that prevent the heart from pumping an adequate amount of blood to meet the body's metabolic needs. This condition often arises from myocardial infarction or ischemia, leading to decreased cardiac output, reduced tissue perfusion, impaired gas exchange, fluid volume imbalance, and decreased functional ability.Heart failure can result from disruptions in the mechanisms that regulate cardiac output...
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Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

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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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Heart Failure III: Clinical Manifestations01:26

Heart Failure III: Clinical Manifestations

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Heart failure (HF) manifests primarily as dyspnea, fatigue, and fluid retention, resulting in peripheral and pulmonary edema. Symptoms may vary depending on which ventricle is more affected, left or right.Left-Sided Heart FailureAlso known as left ventricular failure, this condition results from the left ventricle's inability to fill or eject sufficient blood into the systemic circulation. It leads to pulmonary congestion, which occurs when the left ventricle fails to eject blood effectively...
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Related Experiment Video

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Assessing Endothelial Vasodilator Function with the Endo-PAT 2000
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Assessing Endothelial Vasodilator Function with the Endo-PAT 2000

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Endothelial function and dysfunction in heart failure

R Ferrari1, T Bachetti, L Agnoletti

  • 1Chair of Cardiology, University of Brescia, Italy.

European Heart Journal
|August 26, 1998
PubMed
Summary
This summary is machine-generated.

Congestive heart failure impairs endothelial function, reducing nitric oxide and causing vasoconstriction. Angiotensin-converting enzyme (ACE) inhibitors may improve vascular tone by restoring endothelial function in heart failure patients.

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Ultrasound Assessment of Endothelial Function: A Technical Guideline of the Flow-mediated Dilation Test
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Area of Science:

  • Cardiovascular Physiology
  • Endothelial Biology
  • Heart Failure Pathophysiology

Background:

  • The endothelium regulates vascular smooth muscle tone via secreted factors like nitric oxide (NO).
  • Bradykinin, a vasodilator, enhances constitutive NO activity and influences vascular tone.
  • Congestive heart failure (CHF) is associated with impaired endothelial function and reduced NO-mediated vasodilation.

Purpose of the Study:

  • To investigate the role of endothelial dysfunction in CHF.
  • To explore the mechanisms behind reduced NO bioavailability in CHF.
  • To assess the potential contribution of ACE inhibition to improved endothelial function in CHF.

Main Methods:

  • Review of physiological and clinical data on endothelial function in CHF.
  • Analysis of the interplay between shear stress, NO synthase, bradykinin, and angiotensin-converting enzyme (ACE) in CHF.
  • Examination of the impact of tumor necrosis factor (TNF) on endothelial cells in CHF.

Main Results:

  • Reduced shear stress and upregulated ACE contribute to decreased NO production in CHF.
  • ACE upregulation inactivates bradykinin, further reducing NO synthesis.
  • CHF involves TNF-induced downregulation of NO synthase and increased endothelial apoptosis.

Conclusions:

  • Endothelial dysfunction in CHF contributes to increased peripheral vasomotor tone.
  • Abnormalities in NO signaling and bradykinin metabolism are key features of CHF.
  • ACE inhibition may offer therapeutic benefits in CHF by improving endothelial function.