Normal left ventricular wall motion measured with two-dimensional myocardial tagging

Area of Science:

• Cardiovascular Imaging
• Cardiac Mechanics
• Biomedical Engineering

Background:

• Understanding normal left ventricular (LV) function is crucial for diagnosing cardiac diseases.
• Quantifying LV wall motion and deformation provides insights into myocardial mechanics.
• Myocardial tagging is an advanced magnetic resonance (MR) imaging technique for assessing cardiac motion.

Purpose of the Study:

• To investigate normal left ventricular (LV) wall motion using myocardial tagging.
• To characterize the three-dimensional (3D) systolic motion of the LV in healthy volunteers.
• To evaluate the potential of MR imaging with myocardial tagging for clinical use.

Main Methods:

• Utilized a myocardial tagging technique with magnetic resonance (MR) imaging.
• Acquired images in 3 true short axis views and a double oblique 4-chamber view.
• Analyzed 14 volunteers for short axis views and 11 for 4-chamber views.

Main Results:

• Observed three orthogonal directions of LV motion during systole: longitudinal, radial, and rotational.
• Documented a change in the direction of LV rotation from early to late systole.
• Found differential rotation between the base (CCW then CW) and apex (CW then CCW), resulting in twisting.

Conclusions:

• MR imaging with myocardial tagging effectively visualizes normal left ventricular wall motion.
• The observed complex systolic motion, including directional twisting, is a key aspect of normal cardiac function.
• This technique shows promise for evaluating cardiac function in patient populations.