Location of flow axis line in the left ventricle and its interaction with local myocardial motion

Area of Science:

• Cardiovascular Physiology
• Biomedical Imaging
• Fluid Dynamics

Background:

• Evaluating left ventricular (LV) pump function requires assessing the interplay between local myocardial motion and blood flow dynamics.
• Traditional methods may not fully capture the complex interactions within the LV.

Purpose of the Study:

• To introduce and validate a novel method for assessing left ventricular function.
• To analyze the interaction between myocardial motion and intracardiac blood flow using a "flow axis line".

Main Methods:

• Generated contour maps of absolute blood flow velocity within the LV.
• Defined the "flow axis line" as the ridgeline of the velocity contour map.
• Assessed LV wall motion using endocardial border tracing and optical flow-derived myocardial velocity distribution.

Main Results:

• The primary flow axis line's position was influenced by short-axis myocardial movement.
• The flow axis line method incorporates three-dimensional blood flow, surpassing previous 2D analyses.
• This method provides a more comprehensive understanding of intracardiac flow patterns.

Conclusions:

• The "flow axis line" effectively visualizes intracardiac blood flow structure.
• This method demonstrates the dynamic interaction between blood flow and cardiac wall motion.
• The flow axis line is a valuable tool for evaluating left ventricular pump function.