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Related Concept Videos

Heart Valves01:16

Heart Valves

The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
Mitral Valve Prolapse I: Introduction01:27

Mitral Valve Prolapse I: Introduction

IntroductionThe mitral valve, one of the heart's four valves, regulates blood flow. These valves have flaps that open and close to direct blood properly through the heart and body. During each heartbeat, the flaps open for blood to pass through and seal shut to prevent backflow. Specifically, the mitral valve opens to allow blood flow from the heart's upper left chamber to the lower left chamber. It then closes securely as the lower left chamber contracts to pump blood to the body, preventing...
Mitral Stenosis I: Introduction01:22

Mitral Stenosis I: Introduction

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...
Mitral Regurgitation I: Introduction01:20

Mitral Regurgitation I: Introduction

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...
Chambers of the Heart01:16

Chambers of the Heart

The human heart is a complex organ made up of four chambers: the right and left atria and the right and left ventricles. These internal chambers are separated by partitions known as the interatrial and interventricular septa. The exterior of the heart features a groove known as the coronary sulcus that demarcates the atria from the ventricles, while the anterior and posterior interventricular sulci distinguish between the two ventricles.
Deoxygenated blood from the body is received in the right...
Mitral Valve Prolapse II: Assessment and Management01:22

Mitral Valve Prolapse II: Assessment and Management

IntroductionA range of clinical features characterizes Mitral Valve Prolapse (MVP), but it is important to note that many individuals with MVP are asymptomatic and may remain so throughout their lives. For those who do exhibit symptoms, the following are the key clinical features:Palpitations: This is a common symptom where individuals feel an irregular or rapid heartbeat. Palpitations in MVP are often due to arrhythmias such as premature ventricular contractions or supraventricular tachycardia.

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Related Experiment Video

Updated: Jun 4, 2026

Biaxial Mechanical Characterizations of Atrioventricular Heart Valves
11:00

Biaxial Mechanical Characterizations of Atrioventricular Heart Valves

Published on: April 9, 2019

Electromechanical coupling between the atria and mitral valve.

Julia C Swanson1, Gaurav Krishnamurthy, John-Peder Escobar Kvitting

  • 1Department of Cardiothoracic Surgery, Stanford University School of Medicine, California, USA.

American Journal of Physiology. Heart and Circulatory Physiology
|February 1, 2011
PubMed
Summary

Anterior leaflet stiffening during isovolumic contraction requires atrial depolarization, impacting mitral valve function. Loss of this stiffening may contribute to mitral regurgitation.

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Biaxial Mechanical Characterizations of Atrioventricular Heart Valves
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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Mechanics
  • Biomedical Engineering

Background:

  • Anterior leaflet (AL) stiffening during isovolumic contraction (IVC) is proposed to facilitate mitral valve closure.
  • The role of atrial depolarization in this stiffening process remains unclear.

Purpose of the Study:

  • To test the hypothesis that anterior leaflet stiffening during isovolumic contraction requires atrial depolarization.
  • To investigate the mechanical consequences of impaired atrial depolarization on mitral valve function.

Main Methods:

  • Utilized radioopaque markers and biplane videofluoroscopy in ten sheep.
  • Simulated no atrial contraction (NAC) via interventricular-septal pacing.
  • Employed finite-element analysis to determine leaflet stiffness during IVC and isovolumic relaxation (IVR).

Main Results:

  • In control conditions, AL stiffness was significantly greater during IVC compared to IVR.
  • During NAC, annular AL stiffness (circumferential and radial) decreased significantly relative to control.
  • AL free-edge stiffness remained unaffected by the absence of atrial depolarization.

Conclusions:

  • Anterior leaflet annular stiffening during IVC is dependent on atrial depolarization, supporting the hypothesis.
  • Cardiac muscle extending into the leaflet, activated by atrial excitation, is the likely mechanism.
  • Findings suggest a link between impaired atrial activity (e.g., heart block, atrial dysrhythmias, ventricular pacing) and mitral regurgitation.