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Related Concept Videos

Heart Failure II: Pathophysiology01:29

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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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The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
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Related Experiment Video

Updated: Sep 25, 2025

Author Spotlight: Establishment and Confirmation of a Postnatal Right Ventricular Volume Overload Mouse Model
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Molecular Changes in Prepubertal Left Ventricular Development Under Experimental Volume Overload.

Yuqing Hu1, Debao Li2, Chunxia Zhou2

  • 1Department of Cardiology, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.

Frontiers in Cardiovascular Medicine
|May 2, 2022
PubMed
Summary
This summary is machine-generated.

Pediatric left ventricular volume overload (VO) impairs heart development by activating immune responses, suggesting early intervention for aortic regurgitation (AR) is crucial for preventing irreversible dysfunction.

Keywords:
RNA-seqaortic regurgitationleft ventriclematurationsarcomerevolume overload

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Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Immunology

Background:

  • Chronic aortic regurgitation (AR) causes left ventricular (LV) volume overload (VO), leading to pathological responses and dysfunction.
  • Current guidelines for surgical intervention timing in AR are questioned for both adult and pediatric patients.
  • Understanding VO's effect on postnatal LV development is key for optimizing intervention timing.

Purpose of the Study:

  • To investigate the impact of prepubertal LV VO on postnatal LV development and maturation.
  • To explore the molecular mechanisms underlying VO-induced changes in the developing LV.
  • To provide insights into the optimal timing for correcting AR in pediatric patients.

Main Methods:

  • A prepubertal LV VO mouse model was established using an aortocaval fistula (ACF) on postnatal day 7.
  • LV free walls were analyzed at postnatal days 14 and 21.
  • RNA-sequencing, Gene Ontology (GO), and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses were performed.

Main Results:

  • VO and normal LV development shared downregulated cell cycle activity and upregulated metabolic/sarcomere maturation.
  • VO-influenced LVs showed enriched GO terms related to immune responses, unlike normal LVs.
  • Differences in immune responses, angiogenesis, cardiomyocyte proliferation, mitochondrial number, and sarcomere structure were observed between VO and normal LVs.

Conclusions:

  • A prepubertal LV VO mouse model was successfully established.
  • VO significantly influences LV maturation, particularly cardiac conduction, highlighting the need for early AR correction in children.
  • Immune response activation may be a key mechanism in VO-induced LV developmental alterations.