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Related Concept Videos

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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Sympathetic Activation01:16

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The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...
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Heart Failure Drugs: Inhibitors of Renin-Angiotensin System01:26

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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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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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β-adrenergic antagonists, commonly known as β-blockers, block the effects of sympathetic neurotransmitters such as noradrenaline (NA) and adrenaline (ADR). They have several beneficial effects in heart failure treatment. They reduce heart rate, the force of contraction, and cardiac muscle relaxation. They also slow the atrial-ventricular conduction rate and raise the threshold for arrhythmias. The concentration of β-blockers determines their effects on bronchodilation,...
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Heart Failure I: Introduction01:27

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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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Quantifying Acute Changes in Renal Sympathetic Nerve Activity in Response to Central Nervous System Manipulations in Anesthetized Rats
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Sympathetic activation in heart failure.

E Gronda1, V Dusi2, E D'Elia3

  • 1U.O.C. Nefrologia, Dialisi e Trapianto Renale dell'Adulto, Programma Cardiorenale, Dipartimento di Medicina e Specialità Mediche, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milano, Italy.

European Heart Journal Supplements : Journal of the European Society of Cardiology
|August 22, 2022
PubMed
Summary
This summary is machine-generated.

Sympathetic nervous system overdrive initially aids heart failure but becomes detrimental, leading to adverse cardiovascular events. Targeting this hyperactivity is crucial for managing heart failure progression and improving outcomes.

Keywords:
Autonomic nervous systemBaroreflex activationHeart failure

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Area of Science:

  • Cardiology
  • Neuroscience
  • Physiology

Background:

  • Sympathetic nervous system (SNS) activation is a critical response to stressors and cardiac damage.
  • Initially, SNS overdrive compensates for reduced cardiac output in heart failure (HF).
  • However, sustained or exaggerated SNS activation promotes detrimental cardiac remodeling and adverse outcomes.

Purpose of the Study:

  • To elucidate the dual role of sympathetic activation in heart failure.
  • To explore the mechanisms underlying SNS-induced cardiac remodeling.
  • To highlight the kidney's role in the sympathetic response to HF.

Main Methods:

  • Review of existing literature on sympathetic activation in heart failure.
  • Analysis of the role of nerve growth factor (NGF) in cardiac innervation.
  • Examination of the renal contribution to sympathetic overdrive.

Main Results:

  • Exaggerated sympathetic response leads to maladaptive cardiac remodeling and increased mortality.
  • Myocardial infarction triggers increased cardiac nerve density via NGF, which later decreases.
  • The kidney contributes to a vicious cycle of sympathetic hyperactivity in HF.

Conclusions:

  • Sympathetic activation is a double-edged sword in heart failure, initially compensatory but ultimately harmful.
  • Understanding the intracardiac neuronal network and NGF's role is key.
  • Therapeutic strategies targeting sympathetic hyperactivity are essential for HF management.