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The dynamic anterior mitral annulus.

Landi M Parish1, Benjamin M Jackson, Yoshiharu Enomoto

  • 1Harrison Department of Surgical Research, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA.

The Annals of Thoracic Surgery
|October 7, 2004
PubMed
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The anterior mitral annulus is not fixed; its size changes with blood pressure and heart muscle contraction. This study shows the anterior annulus is a dynamic structure in sheep.

Area of Science:

  • Cardiovascular physiology
  • Cardiac mechanics
  • Mitral valve anatomy

Background:

  • The anterior mitral annulus was traditionally considered a fixed anatomical landmark.
  • Emerging evidence suggests the anterior mitral annulus exhibits dynamic behavior.
  • This study investigated the plasticity of the anterior mitral annulus under varying physiological conditions.

Purpose of the Study:

  • To test the hypothesis that anterior mitral annulus size varies with hemodynamic loading.
  • To determine if ventricular contractility influences anterior mitral annulus dimensions.
  • To quantify changes in mitral annular dimensions under altered physiological states.

Main Methods:

  • Sonomicrometry was used to measure mitral annular dimensions in sheep.

Related Experiment Videos

  • Hemodynamic loading was altered using neosynephrine to increase blood pressure.
  • Ventricular contractility and heart rate were modulated using isoproterenol infusions.

    • Main Results:

    • Neosynephrine administration significantly increased total and anterior mitral annular circumference.
    • Isoproterenol infusion led to a decrease in total mitral annular circumference, affecting both anterior and posterior segments at higher doses.
    • The anterior annulus demonstrated significant size variations in response to hemodynamic and inotropic changes.

    Conclusions:

    • The anterior mitral annulus is a dynamic structure in sheep, not a fixed one.
    • Mitral annular size is responsive to alterations in hemodynamic load.
    • Ventricular contractility significantly influences the dimensions of the anterior mitral annulus.