Assessment of regional left ventricular long-axis motion with MR velocity mapping in healthy subjects

Area of Science:

• Cardiology
• Medical Imaging
• Physiology

Background:

• Understanding left ventricular function is crucial for diagnosing cardiac conditions.
• Assessing regional myocardial motion provides insights into heart health.

Purpose of the Study:

• To evaluate left ventricular long-axis motion during early diastole using magnetic resonance (MR) velocity mapping.
• To investigate regional variations in velocity and their correlation with age and heart rate.

Main Methods:

• Magnetic resonance (MR) velocity mapping was employed in 31 healthy volunteers.
• Regional long-axis velocities were measured throughout the cardiac cycle.
• Data were analyzed for variations in velocity across different ventricular walls and correlation with physiological parameters.

Main Results:

• The greatest magnitude of long-axis velocity occurred during early diastole.
• Significant regional differences were observed: lateral wall (140 mm/sec), anterior (96 mm/sec), inferior (92 mm/sec), and inferoseptal (87 mm/sec).
• Peak early-diastolic velocity showed a significant decline with age (r = -0.64, P < .001) but was not dependent on heart rate (r = 0.014, P = .94).

Conclusions:

• Magnetic resonance (MR) velocity mapping is effective for assessing regional left ventricular long-axis function.
• Age is a significant factor influencing early diastolic velocity, suggesting potential age-related changes in myocardial function.
• Regional variations in ventricular wall motion are detectable with this technique.