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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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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 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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The Effect of Downsizing on the Normal Tricuspid Annulus.

Mrudang Mathur1, William D Meador2, Tomasz Jazwiec3

  • 1Department of Mechanical Engineering, University of Texas at Austin, 204 E Dean Keeton Street, Austin, TX, 78712, USA.

Annals of Biomedical Engineering
|October 30, 2019
PubMed
Summary

Tricuspid annuloplasty downsizing primarily compresses the anterior annulus, reducing its area and dynamics. This surgical insight may improve future transcatheter device designs for treating valve regurgitation.

Keywords:
AnnuloplastyCurvatureDe VegaFunctional regurgitationRepairStrainTricuspid valve

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Area of Science:

  • Cardiovascular Surgery
  • Biomedical Engineering
  • Cardiac Mechanics

Background:

  • Tricuspid annuloplasty is a surgical procedure to reduce tricuspid regurgitation.
  • The degree of annular downsizing is a critical parameter influencing surgical outcomes.
  • Understanding the geometric and dynamic changes of the annulus during downsizing is essential.

Purpose of the Study:

  • To investigate the effects of varying degrees of downsizing on the tricuspid annulus.
  • To analyze the changes in annular shape, dynamics, and continuous field metrics during suture annuloplasty.
  • To provide insights into the mechanisms driving annular changes during tricuspid valve repair.

Main Methods:

  • Implantation of fiduciary markers in the tricuspid annulus of healthy sheep.
  • Performance of sequential DeVega suture annuloplasty with five downsizing steps.
  • Acquisition of hemodynamic and sonomicrometry data in beating hearts.
  • Approximation of annular geometry using splines and computation of clinical and continuous field metrics.

Main Results:

  • Annular area reduction was mainly due to anterior annular compression.
  • Reduced annular dynamics correlated with decreased anterior annular contractility.
  • Global annular height and eccentricity changes were explained by focal height profile alterations and curvature changes.

Conclusions:

  • Downsizing in tricuspid annuloplasty significantly impacts annular geometry and dynamics, particularly in the anterior region.
  • The findings elucidate the mechanical consequences of suture annuloplasty.
  • This research can inform the design of novel transcatheter devices for tricuspid valve repair.