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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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Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
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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 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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The key clinical manifestations of Rheumatic heart disease (RHD) include several distinct cardiac symptoms.Carditis, a hallmark of acute rheumatic fever, involves inflammation of the heart's endocardium, myocardium, and pericardium. Chronic RHD often results from recurrent episodes of carditis. Its symptoms include the following:Murmurs are caused by valvular damage, especially to the mitral and aortic valves. Mitral stenosis or regurgitation is common, with characteristic heart murmurs...
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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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Inflammation and heart failure: a two-sample Mendelian randomization study.

Sharon Remmelzwaal1, Sabine van Oort1, M Louis Handoko2

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Summary
This summary is machine-generated.

This study investigated if inflammation causes heart failure using Mendelian randomization. No causal link was found between inflammatory biomarkers and new-onset heart failure risk.

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Area of Science:

  • Cardiovascular Disease Epidemiology
  • Immunology
  • Genetic Epidemiology

Background:

  • Observational studies suggest a link between inflammation and heart failure, but results are inconsistent.
  • Causality is difficult to establish due to biases like reverse causation and confounding in observational research.
  • Mendelian randomization offers a robust approach to assess causal relationships, minimizing such biases.

Purpose of the Study:

  • To investigate the potential causal relationship between various inflammatory biomarkers and the risk of new-onset heart failure.
  • To utilize a two-sample Mendelian randomization approach for a more reliable assessment of causality.
  • To clarify the role of inflammation in the development of heart failure.

Main Methods:

  • Selected ten inflammatory biomarkers with available genome-wide association studies (GWAS) data in European ancestry individuals.
  • Included C-reactive protein (CRP), immunoglobulin E, tumor necrosis factor (TNF), and several interleukins.
  • Utilized a large GWAS meta-analysis for heart failure cases and controls, employing the inverse-variance weighted method for analysis.

Main Results:

  • No significant causal association was found between CRP, TNF, and several interleukin biomarkers and heart failure risk.
  • Other investigated biomarkers also showed no association with heart failure risk.
  • Several biomarkers exhibited weak instrument bias, potentially limiting the power of the analysis.

Conclusions:

  • This Mendelian randomization study could not establish a causal relationship between the investigated inflammatory biomarkers and the risk of new-onset heart failure.
  • Weak instrument bias was a limitation for some biomarkers, suggesting caution in interpretation.
  • Further research may be needed to fully elucidate the complex interplay between inflammation and heart failure.