Dynamism of the mitral annulus: a spatial and temporal analysis.

Area of Science:

• Cardiovascular Physiology
• Cardiac Mechanics
• Echocardiography

Background:

• The mitral annulus is a dynamic structure crucial for proper heart function.
• Understanding mitral annular dynamics is essential for diagnosing and managing various cardiac conditions.

Purpose of the Study:

• To investigate the extent and timing of mitral annular area changes during the cardiac cycle.
• To determine if these changes are global or localized to the posterior annulus.

Main Methods:

• Prospective, observational study at a tertiary care university hospital.
• Intraoperative 3D transesophageal echocardiography in patients undergoing non-valvular cardiac surgery.
• Geometric analysis of annular areas, diameters, and intertrigonal distance throughout the cardiac cycle.

Main Results:

• Both anterior and posterior mitral annulus portions showed dynamic changes during the cardiac cycle.
• Annular expansion occurred from mid-systole to early diastole; contraction from mid-diastole to early systole.
• Area changes were equally contributed by anterior and posterior annulus; intertrigonal distance showed minimal change.

Conclusions:

• The mitral annulus exhibits distinct expansion and contraction phases involving both anterior and posterior regions.
• Intertrigonal distance demonstrates less significant changes compared to other annular dimensions during the cardiac cycle.