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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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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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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 VI: Adjunct Therapies01:22

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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 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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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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Related Experiment Video

Updated: Jan 30, 2026

Author Spotlight: Investigating HR-Dependent Cardiac Function in Mouse Models Through a Novel Atrial-Pacing Approach
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Multiscale characterization of heart failure.

F Sahli Costabal1, J S Choy2, K L Sack3

  • 1Departments of Mechanical Engineering & Bioengineering, Stanford University, CA, USA.

Acta Biomaterialia
|January 11, 2019
PubMed
Summary
This summary is machine-generated.

Increased sarcomere number drives myocyte lengthening, a key factor in dilated heart failure progression. This study links subcellular changes to organ-level cardiac dilation, suggesting new therapeutic targets.

Keywords:
Bayesian inferenceGrowth and remodelingHeart failureMachine learningMultiscale modelingMyocyteSarcomereUncertainty quantification

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Area of Science:

  • Cardiovascular Biology
  • Biophysics
  • Computational Biology

Background:

  • Dilated cardiomyopathy causes heart failure through contractile dysfunction.
  • Mechanotransduction pathways increase sarcomere number, leading to myocyte lengthening and ventricular dilation.
  • The precise link between sarcomere dynamics, myocyte morphology, and organ-level dilation is not fully understood.

Purpose of the Study:

  • To quantify correlations between sarcomere dynamics, myocyte morphology, and ventricular dilation in dilated cardiomyopathy.
  • To establish a multiscale understanding connecting subcellular changes to organ-level cardiac dysfunction.

Main Methods:

  • A chronic eight-week volume overload animal study in pigs.
  • Continuum growth modeling and Bayesian inference.
  • Machine learning techniques to analyze data across scales.

Main Results:

  • Sarcomere number increased by 3.8%/week, driving myocyte lengthening (3.3%/week).
  • Myocyte lengthening explained 54% of cardiac dilation.
  • Serial sarcomere number was the primary determinant of myocyte lengthening (88%).

Conclusions:

  • Sarcomere number and myocyte length are closely correlated and are major determinants of dilated heart failure.
  • Altering sarcomere turnover presents a potential therapeutic strategy for heart failure.
  • This study provides a multiscale framework for understanding and potentially treating heart failure.