[Echocardiographic evaluation of left ventricular function in mitral insufficiency]

Area of Science:

• Cardiology
• Diagnostic Imaging
• Cardiac Physiology

Background:

• Mitral regurgitation (MR) is a significant valvular heart disease.
• Accurate assessment of left ventricle (LV) function and MR severity is crucial for patient management.
• Echocardiography is a primary non-invasive tool for cardiac evaluation.

Purpose of the Study:

• To investigate the diagnostic capabilities of M-mode echocardiography (EchoCG) for assessing left ventricle function and mitral regurgitation.
• To identify key EchoCG parameters indicative of mitral insufficiency.
• To evaluate EchoCG's accuracy in determining the severity of mitral regurgitation.

Main Methods:

• Study included 76 patients with isolated mitral insufficiency.
• Diagnosis and severity of MR were confirmed by clinical, non-invasive, and invasive methods (cardiac catheterization, left ventriculography).
• M-mode echocardiography was used to evaluate LV dimensions, volumes, and contractility, as well as mitral valve and blood flow dynamics.

Main Results:

• EchoCG alterations were non-specific, reflecting LV and left atrial volume overload.
• Significant EchoCG indices for MR diagnosis include regurgitation volume, fraction, index, LV dimensions/volumes, and left atrial size.
• High-degree MR can mask LV contractility insufficiency; normal contractility indices in severe MR indicate reduced contractility.
• EchoCG can differentiate mild/moderate from severe MR with relative accuracy.
• Mild MR may result in normal EchoCG findings.

Conclusions:

• M-mode echocardiography is valuable for evaluating LV function and diagnosing mitral regurgitation.
• Specific functional indices and chamber dimensions are key for EchoCG diagnosis and severity assessment of MR.
• EchoCG provides an approximate evaluation of MR severity, with limitations in mild cases and potential masking of LV dysfunction in severe MR.