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Related Concept Videos

Heart Valves01:16

Heart Valves

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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...
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Mitral Valve Prolapse I: Introduction01:27

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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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Mitral Regurgitation I: Introduction01:20

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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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Related Experiment Video

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Protocol for Relative Hydrodynamic Assessment of Tri-leaflet Polymer Valves
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A D-Shaped Bileaflet Bioprosthesis which Replicates Physiological Left Ventricular Flow Patterns.

Sean Guo-Dong Tan1, Sangho Kim1, Jimmy Kim Fatt Hon2

  • 1Department of Biomedical Engineering, National University of Singapore, Faculty of Engineering, Block E4, #04-08, 4 Engineering Drive 3, Singapore 117583, Singapore.

Plos One
|June 4, 2016
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Summary
This summary is machine-generated.

A new D-shaped artificial mitral valve (GD valve) may restore healthy heart flow patterns. Biomimetic design shows promise in reducing turbulence and conserving energy compared to traditional valves.

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Area of Science:

  • Cardiovascular Engineering
  • Biomedical Engineering
  • Fluid Dynamics

Background:

  • Healthy hearts exhibit a significant asymmetric vortex in the left ventricle, crucial for steady blood flow.
  • Current artificial mitral valves negatively impact this natural flow pattern.
  • Biomimetic design principles are explored to address this limitation.

Purpose of the Study:

  • To evaluate the hemodynamic performance of a novel D-shaped bileaflet porcine bioprosthesis (GD valve).
  • To test the hypothesis that biomimicry in mitral valve design can restore physiological left ventricle flow.
  • To compare the GD valve's performance against a conventional artificial heart valve.

Main Methods:

  • In-vitro experiment utilizing two-dimensional particle velocimetry imaging (2D-PVI).
  • Hemodynamic assessment of the GD valve.
  • Comparative analysis with the St. Jude Epic valve as a control.

Main Results:

  • Both GD and St. Jude Epic valves demonstrated comparable Reynolds shear stress and Turbulent Kinetic Energy.
  • The novel D-shaped GD valve exhibited lower turbulence intensity.
  • The GD valve showed greater mean kinetic energy conservation.

Conclusions:

  • The biomimetic D-shaped GD valve shows potential for restoring physiological left ventricle flow patterns.
  • This design may offer improved hemodynamic performance over existing artificial mitral valves.
  • Further research into biomimetic valve design is warranted for enhanced cardiovascular device development.