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Related Concept Videos

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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...
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Related Experiment Video

Updated: Jun 5, 2026

Permanent Ligation of the Left Anterior Descending Coronary Artery in Mice: A Model of Post-myocardial Infarction Remodelling and Heart Failure
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Mitral leaflet remodeling in dilated cardiomyopathy.

Tomasz A Timek1, David T Lai, Paul Dagum

  • 1Department of Cardiothoracic Surgery, Stanford University School of Medicine Stanford, California 94305-5247, USA.

Circulation
|July 6, 2006
PubMed
Summary

Tachycardia-induced cardiomyopathy causes mitral valve leaflets to lengthen due to remodeling near the edge, not tethering or shape change. This remodeling is linked to mitral regurgitation in cardiomyopathy.

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An Image Guided Transapical Mitral Valve Leaflet Puncture Model of Controlled Volume Overload from Mitral Regurgitation in the Rat

Published on: May 19, 2020

Area of Science:

  • Cardiovascular Research
  • Cardiac Mechanics
  • Biomedical Engineering

Background:

  • Mammalian mitral valve leaflets exhibit regional variations in composition and structure.
  • The impact of dilated cardiomyopathy on mitral leaflet shape and geometry remains unclear.

Purpose of the Study:

  • To investigate how tachycardia-induced cardiomyopathy (TIC) affects mitral valve leaflet shape, geometry, and regional remodeling.
  • To determine if leaflet tethering or significant shape changes occur in TIC-induced functional mitral regurgitation (FMR).

Main Methods:

  • Implanted radio-opaque markers on the mitral annulus and leaflets in nine sheep.
  • Induced cardiomyopathy and functional mitral regurgitation via rapid pacing.
  • Utilized biplane videofluoroscopy and echocardiography to measure leaflet length, segment lengths, and displacement.

Main Results:

  • Total anterior mitral leaflet (AML) and posterior mitral leaflet (PML) length increased significantly after pacing.
  • Significant regional remodeling was observed only in leaflet segments near the edge (AML S4 and PML S5).
  • No changes in AML shape or leaflet tethering were detected.

Conclusions:

  • Tachycardia-induced cardiomyopathy leads to mitral leaflet lengthening through regional remodeling at the leaflet edge.
  • Mitral regurgitation in cardiomyopathy involves leaflet remodeling, challenging the purely "functional" explanation of FMR.
  • Findings suggest a structural basis for mitral regurgitation in cardiomyopathy beyond simple annular dilation.