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Comparison between circumflex artery motion and mitral annulus motion

K Emilsson1, A Kähäri, B Wandt

  • 1Department of Clinical Physiology, Orebro Medical Centre Hospital, Sweden.

Scandinavian Cardiovascular Journal : SCJ
|January 5, 2002
PubMed

Insights

Circumflex artery motion (CXM) differs from mitral annulus motion (MAM), especially in patients with normal ejection fraction. CXM reflects epicardial movement, while MAM reflects endocardial movement, impacting left ventricular systolic function assessments.

Area of Science:

  • Cardiology
  • Echocardiography
  • Cardiac Mechanics

Background:

  • Mitral annulus motion (MAM) and circumflex artery motion (CXM) are distinct measures of cardiac movement.
  • Understanding their differences is crucial for accurate assessment of left ventricular systolic function.

Purpose of the Study:

  • To compare MAM with CXM at the basal lateral atrioventricular plane.
  • To differentiate motion amplitudes at endocardial (MAM) versus epicardial (CXM) sites.

Main Methods:

  • Echocardiography and coronary angiography were used to obtain MAM and CXM in 28 patients.
  • Motion amplitudes were recorded epicardially and endocardially in patients with normal and decreased ejection fraction (EF).

Main Results:

  • CXM exceeded MAM in patients with normal EF, but was lower in those with decreased EF.
  • Epicardial motion amplitude was significantly higher than endocardial motion in normal EF patients.
  • No significant difference in motion amplitude was observed between epicardial and endocardial sites in decreased EF patients.

Conclusions:

  • CXM represents epicardial atrioventricular plane motion, distinct from endocardial MAM.
  • This distinction is critical when utilizing CXM for evaluating left ventricular systolic function.
Abstract

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