Non-Invasive Evaluation of Heart Function with Four-Dimensional Echocardiography

Area of Science:

• Cardiology
• Medical Imaging
• Echocardiography

Background:

• Assessing left ventricular (LV) systolic function is crucial in cardiology.
• Traditional methods may have limitations in accuracy and feasibility.

Purpose of the Study:

• To evaluate the accuracy and feasibility of four-dimensional echocardiography (4DE) for determining LV systolic function.
• To compare 4DE-derived parameters with sonomicrometry data.

Main Methods:

• Utilized 20 ex vivo pig hearts with latex balloons in the LV, driven by a pulsatile pump.
• Quantified global longitudinal strain (GLS), global circumferential strain (GCS), global area strain (GAS), and LV ejection fraction (LVEF) using 4DE and 2DE.
• Correlated echocardiographic data with sonomicrometry measurements across varying stroke volumes (30-70 ml).

Main Results:

• All echocardiographic parameters (GLS, GCS, GAS, 2DE-LVEF, 4DE-LVEF) showed strong correlations with sonomicrometry (r values ranging from 0.77 to 0.96, P <0.001).
• Bland-Altman analysis indicated slight overestimations for echo-derived GLS, GCS, 2DE-LVEF, and 4DE-LVEF compared to sonomicrometry.
• Global circumferential strain (GCS) and 4D LVEF demonstrated better agreement with sonomicrometry than GLS and 2D LVEF.

Conclusions:

• Four-dimensional echocardiography (4DE) provides accurate assessment of LV systolic function.
• Global circumferential strain (GCS) derived from 4DE is a promising alternative parameter for quantifying LV systolic function.