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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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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 V: Medical Management01:30

Heart Failure V: Medical Management

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Medical Management of Acute Decompensated Heart Failure (ADHF)The primary goals of therapy for patients hospitalized with acute decompensated heart failure (ADHF) include:Relieving symptomsOptimizing volume statusSupporting oxygenation and ventilationMaintaining cardiac output (CO) and end-organ perfusionIdentifying and addressing the cause of ADHFPreventing complicationsProviding patient education on factors precipitating HF exacerbationPlanning for dischargeOngoing monitoring and assessment...
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Heart Failure VI: Adjunct Therapies01:22

Heart Failure VI: Adjunct Therapies

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Additional therapies for treating patients with heart failure (HF) may include procedural interventions, supplemental oxygen, the management of sleep disorders, and nutritional therapy.Procedural InterventionsImplantable Cardioverter-Defibrillator: For patients at risk of life-threatening arrhythmias due to severe left ventricular dysfunction, an Implantable Cardioverter-Defibrillator (ICD) can detect and terminate these arrhythmias, preventing sudden cardiac death and improving survival rates.
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Heart Failure I: Introduction01:27

Heart Failure I: Introduction

107
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 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

Updated: Oct 5, 2025

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Reverse re-modelling chronic heart failure by reinstating heart rate variability.

J Shanks1, Y Abukar1, N A Lever2

  • 1Manaaki Manawa-The Centre for Heart Research, Department of Physiology, University of Auckland, Park Road, Grafton, Auckland, New Zealand.

Basic Research in Cardiology
|February 1, 2022
PubMed
Summary
This summary is machine-generated.

Restoring respiratory sinus arrhythmia (RSA) in heart failure patients significantly improved cardiac output and reversed detrimental heart remodeling. This novel pacing approach offers a promising alternative to current pacemaker therapies for heart failure.

Keywords:
Cardiac outputHeart failurePacemakerRespiratory sinus arrhythmia

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Area of Science:

  • Cardiovascular Physiology
  • Biomedical Engineering
  • Heart Failure Research

Background:

  • Heart rate variability (HRV) is a key marker of cardiovascular health, with low HRV linked to heart failure severity and mortality.
  • Respiratory sinus arrhythmia (RSA), the natural heart rate fluctuation with breathing, is diminished in cardiovascular disease.
  • Current pacemakers lack the ability to restore lost RSA in heart failure patients.

Purpose of the Study:

  • To investigate if restoring RSA in a heart failure model could improve cardiac function.
  • To compare the effects of RSA-modulated pacing versus standard monotonic pacing.

Main Methods:

  • An ovine model of heart failure with reduced ejection fraction was used.
  • Animals were recorded for 24 hours under three conditions: RSA pacing, monotonic pacing, and heart failure control.
  • Measurements included real-time blood pressure, cardiac output, heart rate, and diaphragmatic EMG.

Main Results:

  • RSA pacing increased cardiac output by 20% (1.4 L/min) compared to monotonic pacing.
  • This improvement led to reduced apneas, reversed cardiomyocyte hypertrophy, and restored T-tubule structure.
  • RSA pacing demonstrated superior benefits over contemporary pacing therapies.

Conclusions:

  • Restoring RSA in heart failure reverses adverse cardiac remodeling and significantly enhances cardiac function.
  • This approach holds promise as a novel therapeutic strategy for pacemaker-dependent heart failure patients.