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Related Concept Videos

Mitral Regurgitation I: Introduction01:20

Mitral Regurgitation I: Introduction

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Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
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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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Mitral Stenosis I: Introduction01:22

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Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
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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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Related Experiment Video

Updated: Nov 19, 2025

Induction of Right Ventricular Failure by Pulmonary Artery Constriction and Evaluation of Right Ventricular Function in Mice
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Transcriptomic and Functional Analyses of Mitochondrial Dysfunction in Pressure Overload-Induced Right Ventricular

HyunTae V Hwang1, Nefthi Sandeep1, Ramesh V Nair2

  • 1Department of Pediatrics (Cardiology) Stanford University Palo Alto CA.

Journal of the American Heart Association
|February 1, 2021
PubMed
Summary
This summary is machine-generated.

Right ventricle (RV) pressure overload impairs mitochondrial energy production, leading to RV failure. Targeting mitochondrial dysfunction may offer new therapies for heart disease.

Keywords:
congenital heart diseaseenergy metabolismmitochondriaoxidative stressright ventricular pressure overload

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Area of Science:

  • Cardiovascular Biology
  • Mitochondrial Medicine
  • Congenital Heart Disease Research

Background:

  • Complex congenital heart disease, like tetralogy of Fallot, causes right ventricle (RV) pressure overload.
  • This overload leads to RV hypertrophy and, ultimately, RV failure through poorly understood mechanisms.
  • Mitochondrial bioenergetics' role in this transition is investigated.

Purpose of the Study:

  • To evaluate the role of mitochondrial bioenergetics in the development of RV failure.
  • To understand the molecular mechanisms underlying the transition from RV hypertrophy to RV failure.

Main Methods:

  • A murine model of RV pressure overload was created using pulmonary artery banding.
  • RNA-sequencing, oxidative stress markers, mitochondrial respiration, dynamics, and structure were assessed.
  • Gene expression, enzyme activity, and protein levels were analyzed in RV tissues.

Main Results:

  • RV failure showed decreased expression of electron transport chain and antioxidant genes (ALDH2, SOD2).
  • Oxidative stress markers (HMOX, HNE) increased, and electron transport chain complex activity significantly declined.
  • Mitochondrial fission proteins trended to increase, while fusion proteins (OPA1) decreased, indicating altered mitochondrial dynamics.

Conclusions:

  • Pressure overload-induced RV failure is marked by impaired mitochondrial electron transport chain function and increased oxidative stress.
  • These mitochondrial changes are linked to reduced cellular energy generation.
  • Understanding these bioenergetic alterations could lead to novel therapeutic strategies for RV failure.