Significant dependency of left atrial strain on left ventricular longitudinal motion

Area of Science:

• Cardiology
• Echocardiography
• Cardiac Physiology

Background:

• The relationship between left ventricular longitudinal function and left atrial strain, particularly reservoir function, remains incompletely understood.
• Quantifying these effects is crucial for a comprehensive assessment of cardiac mechanics.

Purpose of the Study:

• To investigate and quantify the impact of left ventricular systolic longitudinal function on left atrial strain.
• To determine the correlation between left atrial strain and key indicators of left ventricular function.

Main Methods:

• Echocardiography was performed on 124 patients.
• Left atrial strain (LAS) and left atrial expansion index (LAEI) were measured using 2D speckle tracking.
• Global longitudinal strain (GLS) and mitral annular plane systolic excursion (MAPSE) were assessed as indices of left ventricular function.

Main Results:

• A significant positive correlation was observed between LAS and GLS (r=0.63, p<0.001) and MAPSE (r=0.65, p<0.001).
• Multivariate regression analysis identified GLS and MAPSE as independent determinants and strongest predictors of LAS.
• These left ventricular systolic longitudinal function parameters explained a significant portion of the variability in LAS.

Conclusions:

• Left atrial strain, a measure of left atrial reservoir function, is significantly associated with left ventricular systolic longitudinal function.
• Left ventricular function, specifically longitudinal parameters like GLS and MAPSE, should be considered when interpreting LAS.
• This study underscores the interconnectedness of left atrial and left ventricular function in cardiac hemodynamics.