Alterations in left ventricular structure and function in type-1 diabetics: a focus on left atrial contribution to...

Area of Science:

• Cardiology
• Endocrinology
• Medical Imaging

Background:

• Type 1 diabetes mellitus (T1DM) is a chronic condition affecting multiple organ systems.
• Cardiac involvement is a significant concern in T1DM, impacting both structure and function.
• Left atrial (LA) function plays a crucial role in diastolic filling and overall cardiac performance.

Purpose of the Study:

• To investigate the specific effects of T1DM on left ventricular (LV) and left atrial (LA) structure and function.
• To identify echocardiographic parameters indicative of cardiac changes in T1DM.
• To determine if T1DM independently predicts alterations in LA function.

Main Methods:

• Echocardiography, including two-dimensional imaging, pulse-wave Doppler, and tissue Doppler imaging.
• Evaluation of 44 non-obese T1DM subjects and 44 matched healthy controls.
• Quantification of LV and LA structural and functional parameters, including diastolic velocities (Em, Am).

Main Results:

• T1DM subjects exhibited higher heart rate, relative wall thickness, and ejection fraction, with lower end-systolic volume compared to controls.
• Significant associations were found between T1DM and altered LA function, including A wave velocity, Am global, A wave integral, and LA ejection fractions.
• Multivariate analysis confirmed T1DM as an independent predictor of A wave integral and LA ejection fractions.

Conclusions:

• T1DM is associated with increased LV systolic function and normal early diastolic filling, despite increased relative wall thickness.
• T1DM leads to significant changes in LA transport function, indicating an increased reliance on LA contribution to LV filling.
• These findings highlight subtle but important cardiac functional alterations in T1DM patients.